chore: bump version to 4.4.7-ba7opf.8 (versionCode 478)

The stored sync cursor was 'yyyyMMdd', which LoTW's qso_qslsince silently
ignores (measured live: it falls back to the system-supplied default).
Write a full UTC 'yyyy-MM-dd HH:mm:ss' cursor instead — the documented
format LoTW honors — so incremental pulls are exact (second precision)
and the settings page can show the last successful sync time on the LoTW
card, formatted like the ephemeris update time (prefs_updated_title).
Legacy yyyyMMdd cursors are normalized for the API, the gate and the
display (lotwCursorApi/lotwCursorDate/lotwCursorEpochMs).

README.md

@@ -6,13 +6,12 @@
 
 ## 本仓库特色功能
 
-- **网格地图模式（Grid Mode）** — 地图页内置 VUCC 网格覆盖图：已通联网格绿色填充、漫游网格蓝色 45° 斜纹（疏朗半透明样式）、当前所在方格淡黄加粗框（field 与 sub-square 缩放均显示）；极区（南北纬 80°–90°）网格线与二位标签完整可见；点击已通联网格弹出该网格内通联明细弹窗；进入网格模式默认 VUCC 视图
-- **奖状边界模式（Award Boundaries）** — 在网格地图上叠加 DXCC / WAPC / WAJA / WAZ / WAS 国界·省界·分区边界，已确认区域绿色填充；香港/澳门作为独立实体显示（DXCC 321/152），港澳标签强制显示
+- **网格地图模式（Grid Mode）** — 地图页内置 VUCC 网格覆盖图：已通联网格绿色填充、漫游网格蓝色 45° 斜纹（疏朗半透明样式）、当前所在方格淡黄加粗框；点击已通联网格弹出该网格内通联明细弹窗；进入网格模式默认 VUCC 视图
+- **奖状边界模式（Award Boundaries）** — 在网格地图上叠加 DXCC / WAPC / WAJA / WAZ / WAS 国界·省界·分区边界，已确认区域绿色填充
 - **LoTW 网格同步** — 直连 ARRL Logbook（账号密码验证）下载确认报告，worked / roamed 网格自动更新（兼容任意字段顺序的 ADIF 解析）；同步失败按凭据错误/限流/超时分类提示
 - **双站过境匹配（Mutual Pass）** — 输入友台经纬度/网格，筛选双方同时可见的卫星过境，在地图上同时显示双方仰角曲线和地面轨迹，支持一键跳转雷达页查看详情
 - **线性卫星转发器频率计算器** — 在雷达页的 Calculator 标签页中，支持 TX/RX 双向多普勒频率计算，以及下行频率偏移（offset）输入，方便操作带偏移的线性卫星
 - **CW 解码器** — 集成 Morse Expert 解码引擎，支持瀑布图、实时解码文本（arm64 + armeabi-v7a 双架构）
-- **Passband 模式** — 支持通过位置滑块（Passband）自动计算 TX/RX 频率，避免切换时跳变
 - **AMSAT 状态页** — 实时查看卫星的业余无线电转发器状态（开启/关闭/待机），支持 72 小时历史记录回放，启动时预取缓存
 - **应用内更新检查** — 设置页一键检查 GitHub 最新 Release，展示版本说明并直接下载安装
 - **自定义 TLE 数据源** — 可添加自定义 TLE/Celestrak CSV 数据源，长按拖拽排序，数据源启停开关与 HTTP 状态码显示

app/src/main/java/com/rtbishop/look4sat/MainApplication.kt

@@ -24,6 +24,13 @@ import android.os.Bundle
 import com.rtbishop.look4sat.core.data.injection.MainContainer
 import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
 import com.rtbishop.look4sat.core.domain.repository.IMainContainer
+import com.rtbishop.look4sat.core.domain.repository.LoTWSyncMode
+import com.rtbishop.look4sat.core.domain.repository.LoTWResult
+import com.rtbishop.look4sat.core.domain.repository.applyLoTWGridResult
+import com.rtbishop.look4sat.core.domain.repository.lotwCursorApi
+import com.rtbishop.look4sat.core.domain.repository.lotwSyncToday
+import com.rtbishop.look4sat.core.domain.repository.resolveLoTWSyncMode
+import com.rtbishop.look4sat.core.domain.repository.shouldAutoSyncLoTW
 import kotlinx.coroutines.launch
 import java.text.SimpleDateFormat
 import java.util.Date
@@ -41,6 +48,8 @@ class MainApplication : Application(), IContainerProvider {
         clearAmSatCacheOnAppBackground()
         // trigger automatic update every 48 hours
         container.appScope.launch { checkAutoUpdate() }
+        // automatic LoTW grid sync on every app start (gated, see checkLoTWAutoSync)
+        container.appScope.launch { checkLoTWAutoSync() }
         // load satellite data on every app start
         container.appScope.launch { container.satelliteRepo.initRepository() }
     }
@@ -79,4 +88,37 @@ class MainApplication : Application(), IContainerProvider {
             }
         }
     }
+
+    /**
+     * Automatic LoTW grid sync, mirroring [checkAutoUpdate]: checked on every
+     * app start, but only pulls when due — LoTW credentials configured, the
+     * LoTW auto-sync toggle on, at least one prior (manual) sync, and not
+     * already synced today (ARRL limits report pulls, ~once a day per account).
+     * Incremental when the callsign is unchanged; a callsign change falls back
+     * to a full replace so no stale grids from another account linger.
+     * Failures are silent and simply retried on the next app start — the manual
+     * sync button still surfaces the explicit cause to the user.
+     */
+    private suspend fun checkLoTWAutoSync(timeNow: Long = System.currentTimeMillis()) {
+        val settingsRepo = container.settingsRepo
+        val lotwSettings = settingsRepo.lotwSettings.value
+        if (!shouldAutoSyncLoTW(
+                isConfigured = lotwSettings.isConfigured,
+                autoLotwSyncEnabled = settingsRepo.otherSettings.value.stateOfAutoLotwSync,
+                lastSyncDate = settingsRepo.getLastLotwSyncDate(),
+                today = lotwSyncToday(timeNow)
+            )
+        ) return
+        val callsign = lotwSettings.callsign.trim().uppercase()
+        val mode = resolveLoTWSyncMode(settingsRepo.getLastLotwSyncCallsign(), callsign, requested = null)
+        val since = if (mode == LoTWSyncMode.Incremental) lotwCursorApi(settingsRepo.getLastLotwSyncDate()) else ""
+        println("Started periodic LoTW grid sync (${mode.name.lowercase()})")
+        val result = container.lotwRepo.fetchConfirmedGridQsos(callsign, lotwSettings.password, since)
+        if (result is LoTWResult.Success) {
+            val count = applyLoTWGridResult(settingsRepo, result, mode, callsign, timeNow)
+            println("Periodic LoTW grid sync finished: $count worked grids")
+        } else {
+            println("Periodic LoTW grid sync skipped (${result::class.simpleName})")
+        }
+    }
 }

app/src/main/java/com/rtbishop/look4sat/MainScreen.kt

@@ -104,33 +104,47 @@ fun NavRoot(deeplink: String? = null) {
     // Reverse: outgoing slides out to the right, incoming drifts in from the left
     val popTransition = slideInHorizontally(tween(300)) { -it / 3 } togetherWith
         slideOutHorizontally(tween(300)) { it }
-    NavDisplay(
-        modifier = Modifier.fillMaxSize(),
-        backStack = rootBackStack,
-        onBack = navigateBack,
-        transitionSpec = { pushTransition },
-        popTransitionSpec = { popTransition },
-        predictivePopTransitionSpec = { popTransition },
-        entryDecorators = listOf(
-            rememberSaveableStateHolderNavEntryDecorator(),
-            rememberViewModelStoreNavEntryDecorator()
-        ),
-        entryProvider = entryProvider {
-            entry<Screen.Passes> {
-                MainScreen(
-                    navigateToRadar = navigateToRadar
-                )
-            }
-            entry<RadarDestination> {
-                Surface(
-                    modifier = Modifier.fillMaxSize(),
-                    color = MaterialTheme.colorScheme.background
-                ) {
-                    RadarDestination(navigateUp = navigateBack)
+    // Elevation color thresholds must be provided at the root level so that BOTH
+    // the tab content (MainScreen) and the root-level RadarDestination see the
+    // user's custom thresholds. RadarDestination is a sibling entry of MainScreen
+    // in this NavDisplay, so a provider inside MainScreen never reaches it.
+    val context = LocalContext.current
+    val container = (context.applicationContext as IContainerProvider).getMainContainer()
+    val otherSettings by container.settingsRepo.otherSettings.collectAsStateWithLifecycle()
+    CompositionLocalProvider(
+        LocalElevationThresholds provides ElevationThresholds(
+            low = otherSettings.lowElevation,
+            high = otherSettings.highElevation
+        )
+    ) {
+        NavDisplay(
+            modifier = Modifier.fillMaxSize(),
+            backStack = rootBackStack,
+            onBack = navigateBack,
+            transitionSpec = { pushTransition },
+            popTransitionSpec = { popTransition },
+            predictivePopTransitionSpec = { popTransition },
+            entryDecorators = listOf(
+                rememberSaveableStateHolderNavEntryDecorator(),
+                rememberViewModelStoreNavEntryDecorator()
+            ),
+            entryProvider = entryProvider {
+                entry<Screen.Passes> {
+                    MainScreen(
+                        navigateToRadar = navigateToRadar
+                    )
+                }
+                entry<RadarDestination> {
+                    Surface(
+                        modifier = Modifier.fillMaxSize(),
+                        color = MaterialTheme.colorScheme.background
+                    ) {
+                        RadarDestination(navigateUp = navigateBack)
+                    }
                 }
             }
-        }
-    )
+        )
+    }
 }
 
 @Composable

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/LoTWRepository.kt

@@ -18,9 +18,13 @@
 package com.rtbishop.look4sat.core.data.repository
 
 import com.rtbishop.look4sat.core.domain.repository.ILoTWRepository
+import com.rtbishop.look4sat.core.domain.repository.LoTWPhase
+import com.rtbishop.look4sat.core.domain.repository.LoTWProgress
 import com.rtbishop.look4sat.core.domain.repository.LoTWResult
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ensureActive
 import kotlinx.coroutines.withContext
+import kotlin.coroutines.coroutineContext
 import java.net.HttpURLConnection
 import java.net.SocketTimeoutException
 import java.net.URL
@@ -46,7 +50,7 @@ class LoTWRepository : ILoTWRepository {
 
     override suspend fun fetchConfirmedGrids(callsign: String, password: String): LoTWResult =
         withContext(Dispatchers.IO) {
-            fetchReportBody(callsign, password).fold(
+            fetchReportBody(callsign, password, since = "", onProgress = {}).fold(
                 onSuccess = { body ->
                     parseBoth(body)?.let { (grids, _, roamed) ->
                         LoTWResult.Success(grids, emptyMap(), roamed)
@@ -58,9 +62,11 @@ class LoTWRepository : ILoTWRepository {
 
     override suspend fun fetchConfirmedGridQsos(
         callsign: String,
-        password: String
+        password: String,
+        since: String,
+        onProgress: (LoTWProgress) -> Unit
     ): LoTWResult = withContext(Dispatchers.IO) {
-        fetchReportBody(callsign, password).fold(
+        fetchReportBody(callsign, password, since, onProgress).fold(
             onSuccess = { body ->
                 parseBoth(body)?.let { (grids, qsos, roamed) ->
                     LoTWResult.Success(grids, qsos, roamed)
@@ -87,33 +93,46 @@ class LoTWRepository : ILoTWRepository {
         return Triple(grids, qsos, roamed)
     }
 
-    private fun fetchReportBody(callsign: String, password: String): Result<String> {
+    private suspend fun fetchReportBody(
+        callsign: String,
+        password: String,
+        since: String,
+        onProgress: (LoTWProgress) -> Unit
+    ): Result<String> {
         val call = callsign.trim().uppercase()
         val pwd = password.trim()
         if (call.isBlank() || pwd.isBlank()) return Result.failure(IOException("empty credentials"))
-        // qso_qslsince with an early date forces a FULL confirmed-QSL report.
-        // Without it, LoTW applies a "system supplied default" since-date and
-        // only returns confirmations newer than the account's last query —
-        // subsequent syncs would return an empty/incremental report.
-        val since = "2000-01-01"
+        // Empty since -> full report. qso_qslsince with an early date forces a
+        // FULL confirmed-QSL report; without it LoTW applies a "system supplied
+        // default" since-date and only returns confirmations newer than the
+        // account's last query — subsequent syncs would be incremental/empty.
+        val effectiveSince = since.ifBlank { "2000-01-01" }
         val query = buildString {
             append("login=").append(URLEncoder.encode(call, "UTF-8"))
             append("&password=").append(URLEncoder.encode(pwd, "UTF-8"))
             append("&qso_query=1&qso_qsl=yes&qso_qsldetail=yes&qso_mydetail=yes")
-            append("&qso_qslsince=").append(URLEncoder.encode(since, "UTF-8"))
+            append("&qso_qslsince=").append(URLEncoder.encode(effectiveSince, "UTF-8"))
         }
         return try {
             val connection = URL("$BASE_URL?$query").openConnection() as HttpURLConnection
             // ARRL can be slow to accept connections from mobile networks
             // (long TLS handshakes across the Pacific, occasional server-side
-            // queueing). 30s connect + 120s read gives the request enough
-            // headroom; the sync button stays disabled meanwhile so users
-            // see progress rather than a hung dialog.
-            connection.connectTimeout = 30_000
-            connection.readTimeout = 120_000
+            // queueing — a busy server took 36.5 s to accept a connection in
+            // testing, so 30 s connect would have killed it).
+            //
+            // NOTE: readTimeout is NOT a total-download cap. It is the longest
+            // wait for the NEXT chunk of data (a stall timeout). A full report
+            // for a huge account (tens of thousands of QSLs ≈ tens of MB at
+            // ARRL's ~10 KB/s stream rate) legitimately takes 30+ minutes;
+            // as long as chunks keep arriving it must never be cut off.
+            // 600 s tolerates long server-side pauses while it generates the
+            // report; a truly dead link (no data at all) still fails within it.
+            connection.connectTimeout = 60_000
+            connection.readTimeout = 600_000
             connection.requestMethod = "GET"
             connection.setRequestProperty("Accept-Encoding", "gzip")
             connection.instanceFollowRedirects = true
+            onProgress(LoTWProgress(LoTWPhase.Connecting))
             val code = connection.responseCode
             if (code !in 200..299) {
                 connection.disconnect()
@@ -123,9 +142,8 @@ class LoTWRepository : ILoTWRepository {
                 else Result.failure(IOException("HTTP $code"))
             }
             val stream = connection.inputStream
-            val body = ("gzip".equals(connection.contentEncoding, ignoreCase = true))
-                .let { gz -> if (gz) java.util.zip.GZIPInputStream(stream) else stream }
-                .bufferedReader().use { it.readText() }
+            val isGzip = "gzip".equals(connection.contentEncoding, ignoreCase = true)
+            val body = readBodyWithProgress(stream, isGzip, onProgress)
             connection.disconnect()
             when {
                 // Login failure: HTTP 200 + HTML login page with the error text.
@@ -135,6 +153,9 @@ class LoTWRepository : ILoTWRepository {
                 !body.contains("<eoh>", ignoreCase = true) -> Result.failure(RateLimitException())
                 else -> Result.success(body)
             }
+        } catch (e: java.util.concurrent.CancellationException) {
+            // Cancellation must propagate — it is not a network failure.
+            throw e
         } catch (e: SocketTimeoutException) {
             Result.failure(TimeoutException(e.message ?: "timed out"))
         } catch (e: SSLException) {
@@ -145,6 +166,68 @@ class LoTWRepository : ILoTWRepository {
         }
     }
 
+    /**
+     * Streams the report body into a string while reporting download progress.
+     * Once the header's record count (<APP_LoTW_NUMREC>) is seen, the total
+     * body size is estimated as NUMREC * AVG_RECORD_BYTES so the UI can show a
+     * meaningful progress bar and remaining-time estimate.
+     */
+    private suspend fun readBodyWithProgress(
+        stream: java.io.InputStream,
+        isGzip: Boolean,
+        onProgress: (LoTWProgress) -> Unit
+    ): String {
+        val input = if (isGzip) java.util.zip.GZIPInputStream(stream) else stream
+        val reader = java.io.InputStreamReader(input, Charsets.UTF_8)
+        val sb = StringBuilder()
+        val buf = CharArray(8192)
+        var bytesRead = 0L
+        var expected = 0L
+        var qsoCount = 0L
+        var speed = 0L
+        var headerSeen = false
+        var lastSampleMs = System.currentTimeMillis()
+        var lastSampleBytes = 0L
+        var lastEmitMs = 0L
+        while (true) {
+            // Cooperative cancellation: lets the user abort a full sync that
+            // was started by mistake. Throws CancellationException once the
+            // job is cancelled; the blocking read below is fast while chunks
+            // keep arriving, so the abort lands on the next chunk boundary.
+            coroutineContext.ensureActive()
+            val n = reader.read(buf)
+            if (n <= 0) break
+            sb.append(buf, 0, n)
+            bytesRead += n
+            // The record count sits in the report header, long before the data.
+            if (!headerSeen) {
+                NUMREC_REGEX.find(sb)?.let { m ->
+                    qsoCount = m.groupValues[1].toLongOrNull() ?: 0L
+                    expected = qsoCount * AVG_RECORD_BYTES
+                    headerSeen = true
+                }
+            }
+            // Sample speed every 500ms, EMA-smoothed.
+            val now = System.currentTimeMillis()
+            if (now - lastSampleMs >= 500) {
+                val elapsedS = (now - lastSampleMs) / 1000.0
+                if (elapsedS > 0) {
+                    val inst = ((bytesRead - lastSampleBytes) / elapsedS).toLong()
+                    speed = if (speed == 0L) inst else (speed * 7 + inst * 3) / 10
+                    lastSampleMs = now
+                    lastSampleBytes = bytesRead
+                }
+            }
+            // Throttle callbacks to ~4/s so StateFlow updates stay cheap.
+            if (now - lastEmitMs >= 250) {
+                onProgress(LoTWProgress(LoTWPhase.Downloading, bytesRead, expected, speed, qsoCount))
+                lastEmitMs = now
+            }
+        }
+        onProgress(LoTWProgress(LoTWPhase.Downloading, bytesRead, expected, speed, qsoCount))
+        return sb.toString()
+    }
+
     internal class CredentialsException : Exception("bad callsign/password")
     internal class RateLimitException : Exception("report refused (rate limit / server error)")
     internal class TimeoutException(message: String) : Exception(message)
@@ -169,6 +252,7 @@ class LoTWRepository : ILoTWRepository {
         var country: String? = null
         var cqz: Int? = null
         var state: String? = null
+        var myGrid: String? = null
         val gridsInRecord = mutableListOf<String>()
 
         fun emitRecord() {
@@ -177,7 +261,8 @@ class LoTWRepository : ILoTWRepository {
             val qso = com.rtbishop.look4sat.core.domain.model.GridQso(
                 call = call, epochMs = epochMs, satName = satName,
                 mode = mode, bandUp = bandUp, bandDown = bandDown,
-                dxcc = dxcc, country = country, cqz = cqz, state = state
+                dxcc = dxcc, country = country, cqz = cqz, state = state,
+                myGrid = myGrid
             )
             for (grid in gridsInRecord) {
                 result.getOrPut(grid) { mutableListOf() }.add(qso)
@@ -188,6 +273,7 @@ class LoTWRepository : ILoTWRepository {
             propMode = null; call = ""; qsoDate = ""; timeOn = ""
             satName = ""; mode = ""; bandUp = ""; bandDown = ""
             dxcc = null; country = null; cqz = null; state = null
+            myGrid = null
             gridsInRecord.clear()
         }
 
@@ -222,6 +308,13 @@ class LoTWRepository : ILoTWRepository {
                     cqz = adifValue(line).toIntOrNull()
                 line.startsWith("<STATE:") ->
                     state = adifValue(line).trim().ifBlank { null }?.let { normalizeState(it) }
+                line.startsWith("<MY_GRIDSQUARE:") -> {
+                    // Own-station grid (must not be confused with GRIDSQUARE —
+                    // the opposite station's grid). Recorded per QSO so awards
+                    // can be counted per operated grid.
+                    val value = adifValue(line)
+                    if (value.length >= 4) myGrid = value.take(4).uppercase()
+                }
                 line.startsWith("<GRIDSQUARE:") || line.startsWith("<VUCC_GRIDS:") -> {
                     // VUCC_GRIDS holds a comma-separated list of grids
                     // ("EN52en,EN53fa"), up to four for contacts spanning
@@ -352,5 +445,16 @@ class LoTWRepository : ILoTWRepository {
 
     private companion object {
         const val BASE_URL = "https://lotw.arrl.org/lotwuser/lotwreport.adi"
+
+        /** Record count in the report header: `<APP_LoTW_NUMREC:4>2367`. */
+        val NUMREC_REGEX = Regex("<APP_LoTW_NUMREC:\\d+>(\\d+)")
+        /**
+         * Measured 2026-09-16 (BH6RJD, 2367 QSLs): 1.7 MB body streamed at
+         * ~9.5 KB/s ≈ 180 s, i.e. ≈ 720 bytes per ADIF record. Use a
+         * CONSERVATIVE (larger) estimate so the progress bar never hits 100%
+         * before the download truly ends — an under-estimate made the bar sit
+         * at 100% while data was still flowing, read as "finished but stuck".
+         */
+        const val AVG_RECORD_BYTES = 900L
     }
 }

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/SatelliteRepo.kt

@@ -35,6 +35,8 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.withContext
 import java.util.TimeZone
@@ -66,8 +68,11 @@ class SatelliteRepo(
     override suspend fun initRepository() = withContext(dispatcher) {
         combine(
             settingsRepo.selectedIds,
-            settingsRepo.stationPosition
-        ) { selectedIds, _ -> selectedIds }
+            settingsRepo.stationPosition,
+            // Recalculate passes when the UTC display toggle changes, so an existing
+            // AOS time window is reapplied in the newly selected timezone.
+            settingsRepo.otherSettings.map { it.stateOfUtc }.distinctUntilChanged()
+        ) { selectedIds, _, _ -> selectedIds }
             .collect { selectedIds ->
                 _satellites.update { localStorage.getEntriesWithIds(selectedIds) }
                 val settings = settingsRepo.passesSettings.value

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/SettingsRepo.kt

@@ -77,6 +77,7 @@ class SettingsRepo(
     private val keySelectedTypes = "selectedTypes"
     private val keySelectedModes = "selectedModes"
     private val keyStateOfAutoUpdate = "stateOfAutoUpdate"
+    private val keyStateOfAutoLotwSync = "stateOfAutoLotwSync"
     private val keyStateOfSensors = "stateOfSensors"
     private val keyStateOfSweep = "stateOfSweep"
     private val keyStateOfUtc = "stateOfUtc"
@@ -204,7 +205,9 @@ class SettingsRepo(
                         dxcc = o.optInt("dx", 0).takeIf { it > 0 },
                         country = o.optString("cty").ifBlank { null },
                         cqz = o.optInt("cq", 0).takeIf { it > 0 },
-                        state = o.optString("st").ifBlank { null }
+                        state = o.optString("st").ifBlank { null },
+                        // Own-grid field: absent in pre-myGrid data -> null.
+                        myGrid = o.optString("mg").ifBlank { null }
                     )
                 }
                 if (list.isNotEmpty()) result[grid] = list
@@ -232,6 +235,7 @@ class SettingsRepo(
                         .put("cty", q.country ?: "")
                         .put("cq", q.cqz ?: 0)
                         .put("st", q.state ?: "")
+                        .put("mg", q.myGrid ?: "")
                 )
             }
             root.put(grid, array)
@@ -286,6 +290,24 @@ class SettingsRepo(
             callsign = preferences.getString(keyLoTWCall, null).orEmpty(),
             password = preferences.getString(keyLoTWPass, null).orEmpty()
         )
+
+    // Last successful sync bookkeeping: date ("yyyyMMdd") and callsign. Used to
+    // decide incremental (same callsign) vs full (first time / callsign change)
+    // report requests and to merge increments into the stored grid data.
+    private val keyLastLotwSyncDate = "lotwLastSyncDate"
+    private val keyLastLotwSyncCallsign = "lotwLastSyncCallsign"
+
+    override fun getLastLotwSyncDate(): String =
+        preferences.getString(keyLastLotwSyncDate, null).orEmpty()
+
+    override fun setLastLotwSyncDate(date: String) =
+        preferences.edit { putString(keyLastLotwSyncDate, date) }
+
+    override fun getLastLotwSyncCallsign(): String =
+        preferences.getString(keyLastLotwSyncCallsign, null).orEmpty()
+
+    override fun setLastLotwSyncCallsign(callsign: String) =
+        preferences.edit { putString(keyLastLotwSyncCallsign, callsign.trim().uppercase()) }
     //endregion
 
     //region # Transceivers settings
@@ -517,6 +539,7 @@ class SettingsRepo(
             val new = transform(current)
             preferences.edit {
                 putBoolean(keyStateOfAutoUpdate, new.stateOfAutoUpdate)
+                putBoolean(keyStateOfAutoLotwSync, new.stateOfAutoLotwSync)
                 putBoolean(keyStateOfSensors, new.stateOfSensors)
                 putBoolean(keyStateOfSweep, new.stateOfSweep)
                 putBoolean(keyStateOfUtc, new.stateOfUtc)
@@ -535,6 +558,7 @@ class SettingsRepo(
 
     private fun getOtherSettings(): OtherSettings = OtherSettings(
         stateOfAutoUpdate = preferences.getBoolean(keyStateOfAutoUpdate, true),
+        stateOfAutoLotwSync = preferences.getBoolean(keyStateOfAutoLotwSync, true),
         stateOfSensors = preferences.getBoolean(keyStateOfSensors, true),
         stateOfSweep = preferences.getBoolean(keyStateOfSweep, true),
         stateOfUtc = preferences.getBoolean(keyStateOfUtc, false),

core/data/src/test/java/com/rtbishop/look4sat/core/data/repository/DatabaseRepoTest.kt

@@ -296,6 +296,10 @@ private class FakeSettingsRepo(dataSources: DataSourcesSettings = defaultDataSou
         MutableStateFlow(com.rtbishop.look4sat.core.domain.model.LoTWSettings())
 
     override fun updateLoTWSettings(settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings) = Unit
+    override fun getLastLotwSyncDate(): String = ""
+    override fun setLastLotwSyncDate(date: String) = Unit
+    override fun getLastLotwSyncCallsign(): String = ""
+    override fun setLastLotwSyncCallsign(callsign: String) = Unit
 
     override fun getWorkedGridQsos(): Map<String, List<com.rtbishop.look4sat.core.domain.model.GridQso>> = emptyMap()
 

core/data/src/test/java/com/rtbishop/look4sat/core/data/repository/LoTWRepositoryTest.kt

@@ -3,6 +3,7 @@ package com.rtbishop.look4sat.core.data.repository
 import com.rtbishop.look4sat.core.domain.repository.LoTWResult
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
 import org.junit.Test
 
 class LoTWRepositoryTest {
@@ -150,6 +151,24 @@ class LoTWRepositoryTest {
         assertNull(repo.parseConfirmedGridQsos("<HTML>Username/password incorrect</HTML>"))
     }
 
+    @Test
+    fun parseQsosCapturesOwnGridPerQso() {
+        // MY_GRIDSQUARE arrives BEFORE PROP_MODE (ADIF fields are emitted
+        // alphabetically); the per-record buffer must still attach it to the QSO.
+        val qso1 = "<CALL:5>A50QO\n<QSO_DATE:8>20260820\n<MY_GRIDSQUARE:4>OL62\n" +
+            "<PROP_MODE:3>SAT\n<SAT_NAME:5>FO-29\n<MODE:2>CW\n" +
+            "<BAND:3>70CM\n<BAND_RX:3>2M\n<GRIDSQUARE:4>NL47\n<EOR>\n"
+        val qso2 = "<CALL:6>BG7ZFK\n<QSO_DATE:8>20260819\n<MY_GRIDSQUARE:4>OL72\n" +
+            "<PROP_MODE:3>SAT\n<SAT_NAME:5>SO-50\n<MODE:3>FM\n" +
+            "<BAND:3>70CM\n<BAND_RX:3>2M\n<GRIDSQUARE:4>OK48\n<EOR>\n"
+        val result = repo.parseConfirmedGridQsos(report(qso1, qso2))!!
+        assertEquals("OL62", result["NL47"]!!.first().myGrid)
+        assertEquals("OL72", result["OK48"]!!.first().myGrid)
+        // Ground QSO (no PROP_MODE=SAT) must not leak its MY_GRIDSQUARE.
+        val ground = "<CALL:6>BA7OPF\n<QSO_DATE:8>20260821\n<MY_GRIDSQUARE:4>OL62\n<GRIDSQUARE:4>NL47\n<EOR>\n"
+        assertTrue(repo.parseConfirmedGridQsos(report(qso1, ground))!!.values.all { it.all { q -> q.myGrid == "OL62" } })
+    }
+
     // endregion
 
     // region parseRoamedGrids (MY_GRIDSQUARE = grids the account operated from)

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/model/GridQso.kt

@@ -48,7 +48,9 @@ data class GridQso(
     val dxcc: Int? = null,
     val country: String? = null,
     val cqz: Int? = null,
-    val state: String? = null
+    val state: String? = null,
+    /** 4-char grid the station itself operated from (ADIF MY_GRIDSQUARE). */
+    val myGrid: String? = null
 ) {
     /** Short uplink/downlink band label ("U/V", "V/A"), or "" when unknown. */
     val bandLabel: String

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/model/Settings.kt

@@ -64,7 +64,10 @@ data class OtherSettings(
     val shouldSeeWhatsNew: Boolean,
     val sstvMode: String = "Auto",
     val lowElevation: Double = 15.0,
-    val highElevation: Double = 45.0
+    val highElevation: Double = 45.0,
+    /** Independent auto-sync toggle for LoTW confirmed grids (separate from the
+     *  ephemeris auto-update; only effective after at least one manual sync). */
+    val stateOfAutoLotwSync: Boolean = true
 )
 
 data class DataSourcesSettings(

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/repository/ILoTWRepository.kt

@@ -30,9 +30,43 @@ interface ILoTWRepository {
      * Same report, but keeps the per-QSO detail of every confirmed satellite
      * QSO (call / time / satellite / mode / bands), grouped by worked 4-char
      * gridsquare. Failure cause is kept explicit.
+     *
+     * @param since   QSL-since date ("yyyyMMdd" or "yyyy-MM-dd"); use an early
+     *                date for a full report, or the last sync date for an
+     *                incremental pull. Empty falls back to a full report.
+     * @param onProgress  streamed download progress (phase + bytes + estimate),
+     *                invoked from the IO dispatcher; may be called on every
+     *                read chunk.
      */
     suspend fun fetchConfirmedGridQsos(
         callsign: String,
-        password: String
+        password: String,
+        since: String = "",
+        onProgress: (LoTWProgress) -> Unit = {}
     ): LoTWResult
 }
+
+/** Streamed progress of a LoTW report download. */
+data class LoTWProgress(
+    val phase: LoTWPhase,
+    /** Bytes read so far (uncompressed body). */
+    val bytesRead: Long = 0,
+    /** Estimated total body bytes, derived from <APP_LoTW_NUMREC>; 0 before known. */
+    val expectedBytes: Long = 0,
+    /** Smoothed download speed in bytes/second; 0 while unknown. */
+    val speedBps: Long = 0,
+    /** Total QSL records reported in the header (<APP_LoTW_NUMREC>); 0 before known. */
+    val qsoCount: Long = 0
+) {
+    /** Fraction 0..1 of the estimated body already read; 0 while unknown. */
+    val fraction: Float
+        get() = if (expectedBytes > 0 && bytesRead > 0)
+            (bytesRead.toFloat() / expectedBytes).coerceIn(0f, 1f) else 0f
+
+    /** Estimated seconds remaining; 0 while size or speed is unknown. */
+    val remainingSeconds: Long
+        get() = if (expectedBytes > 0 && speedBps > 0)
+            ((expectedBytes - bytesRead) / speedBps).coerceAtLeast(0) else 0L
+}
+
+enum class LoTWPhase { Connecting, Downloading }

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/repository/ISettingsRepo.kt

@@ -110,5 +110,11 @@ interface ISettingsRepo {
     //region # LoTW confirmed-grids settings
     val lotwSettings: StateFlow<com.rtbishop.look4sat.core.domain.model.LoTWSettings>
     fun updateLoTWSettings(settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings)
+    /** Last successful LoTW sync date ("yyyyMMdd", empty when never synced). */
+    fun getLastLotwSyncDate(): String
+    fun setLastLotwSyncDate(date: String)
+    /** Callsign of the last successful LoTW sync (empty when never synced). */
+    fun getLastLotwSyncCallsign(): String
+    fun setLastLotwSyncCallsign(callsign: String)
     //endregion
 }

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/repository/LoTWGridSync.kt

@@ -0,0 +1,169 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.repository
+
+import com.rtbishop.look4sat.core.domain.model.GridQso
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+import java.util.TimeZone
+
+/**
+ * Shared LoTW sync orchestration used by BOTH the manual sync (settings screen)
+ * and the automatic sync on app start (MainApplication), so the two paths can
+ * never drift apart:
+ *
+ * - [LoTWSyncMode.Incremental] pulls only the confirmations since the last sync
+ *   and MERGES them into the stored grids/QSOs (grids only grow; QSO detail is
+ *   deduped by call + QSO time).
+ * - [LoTWSyncMode.Full] pulls everything and REPLACES the stored data.
+ */
+
+/**
+ * UTC date ("yyyyMMdd") of the given instant — the "already synced today"
+ * gate granularity.
+ */
+fun lotwSyncToday(now: Long = System.currentTimeMillis()): String =
+    SimpleDateFormat("yyyyMMdd", Locale.US)
+        .apply { timeZone = TimeZone.getTimeZone("UTC") }
+        .format(Date(now))
+
+/**
+ * Full UTC timestamp cursor ("yyyy-MM-dd HH:mm:ss") written after a
+ * successful sync. This is exactly the format LoTW's qso_qslsince accepts
+ * (measured live 2026-09-17: the legacy "yyyyMMdd" cursor is silently
+ * ignored by LoTW, which falls back to its own system-supplied default),
+ * and it keeps enough precision to display the last-sync time like the
+ * ephemeris update time.
+ */
+fun lotwSyncCursor(now: Long = System.currentTimeMillis()): String =
+    SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US)
+        .apply { timeZone = TimeZone.getTimeZone("UTC") }
+        .format(Date(now))
+
+/** Date part of a stored cursor as "yyyyMMdd", tolerating the legacy
+ *  "yyyyMMdd" format and the current "yyyy-MM-dd HH:mm:ss" format. */
+fun lotwCursorDate(cursor: String): String = when {
+    cursor.length >= 10 && cursor[4] == '-' -> cursor.substring(0, 10).replace("-", "")
+    else -> cursor.take(8)
+}
+
+/** qso_qslsince value for the API: passes the full timestamp through and
+ *  normalizes a legacy "yyyyMMdd" cursor to the documented "yyyy-MM-dd". */
+fun lotwCursorApi(cursor: String): String = when {
+    cursor.isBlank() -> ""
+    cursor.length >= 10 && cursor[4] == '-' -> cursor
+    else -> "${cursor.take(4)}-${cursor.substring(4, 6)}-${cursor.substring(6, 8)}"
+}
+
+/** Stored cursor parsed to UTC epoch ms for display; 0 when unparseable. */
+fun lotwCursorEpochMs(cursor: String): Long = try {
+    val pattern = if (cursor.length >= 10 && cursor[4] == '-') "yyyy-MM-dd HH:mm:ss" else "yyyyMMdd"
+    SimpleDateFormat(pattern, Locale.US)
+        .apply { timeZone = TimeZone.getTimeZone("UTC") }
+        .parse(cursor)?.time ?: 0L
+} catch (_: Exception) {
+    0L
+}
+
+/**
+ * Resolves the effective sync mode for a given request:
+ * - an explicit [LoTWSyncMode.Full] request is always honored;
+ * - an [LoTWSyncMode.Incremental] request is honored only when the callsign
+ *   matches the last sync — a first sync, an unknown/empty record or a
+ *   callsign change falls back to [LoTWSyncMode.Full] so no stale grids from
+ *   another account linger.
+ * With [requested] == null (automatic sync) it picks incremental whenever
+ * possible and full otherwise.
+ */
+fun resolveLoTWSyncMode(
+    lastSyncCallsign: String,
+    callsign: String,
+    requested: LoTWSyncMode?
+): LoTWSyncMode {
+    if (requested == LoTWSyncMode.Full) return LoTWSyncMode.Full
+    val sameCall = lastSyncCallsign.isNotBlank() && lastSyncCallsign == callsign
+    return if (sameCall) LoTWSyncMode.Incremental else LoTWSyncMode.Full
+}
+
+/**
+ * Whether the automatic LoTW sync should run now — mirrors the ephemeris
+ * auto-update check: credentials configured, the LoTW auto-sync toggle on, at
+ * least one prior manual sync (the first sync stays manual/full), and not
+ * already synced today (ARRL limits report pulls, ~once a day per account).
+ */
+fun shouldAutoSyncLoTW(
+    isConfigured: Boolean,
+    autoLotwSyncEnabled: Boolean,
+    lastSyncDate: String,
+    today: String
+): Boolean {
+    val lastDate = lotwCursorDate(lastSyncDate)
+    return isConfigured && autoLotwSyncEnabled && lastDate.isNotBlank() && lastDate != today
+}
+
+/**
+ * Applies a successful LoTW report to the stored grid data and advances the
+ * sync cursor so the next incremental pull asks LoTW for only the
+ * confirmations since today. Persistence runs on the IO dispatcher — building
+ * the per-grid QSO JSON and writing SharedPreferences blocks the calling
+ * thread, and for large accounts (multi-MB JSON) that froze the main thread
+ * after a manual sync ('bar done but app stuck').
+ *
+ * @return the resulting number of worked grids.
+ */
+suspend fun applyLoTWGridResult(
+    settingsRepo: ISettingsRepo,
+    result: LoTWResult.Success,
+    mode: LoTWSyncMode,
+    callsign: String,
+    now: Long = System.currentTimeMillis()
+): Int {
+    val existingGrids = settingsRepo.getWorkedGrids()
+    val existingQsos = settingsRepo.getWorkedGridQsos()
+    val existingRoamed = settingsRepo.getRoamedGrids()
+    val mergedGrids = if (mode == LoTWSyncMode.Incremental) existingGrids + result.grids else result.grids
+    val mergedQsos = if (mode == LoTWSyncMode.Incremental) mergeGridQsos(existingQsos, result.qsos) else result.qsos
+    val mergedRoamed = if (mode == LoTWSyncMode.Incremental) existingRoamed + result.roamedGrids else result.roamedGrids
+    settingsRepo.setLastLotwSyncDate(lotwSyncCursor(now))
+    settingsRepo.setLastLotwSyncCallsign(callsign)
+    withContext(Dispatchers.IO) {
+        settingsRepo.setWorkedGrids(mergedGrids)
+        settingsRepo.setWorkedGridQsos(mergedQsos)
+        settingsRepo.setRoamedGrids(mergedRoamed)
+    }
+    return mergedGrids.size
+}
+
+/** Merge fresh QSO detail into existing per-grid lists, dedup by call + QSO time. */
+fun mergeGridQsos(
+    existing: Map<String, List<GridQso>>,
+    fresh: Map<String, List<GridQso>>
+): Map<String, List<GridQso>> {
+    val merged = existing.mapValues { (_, list) -> list.toMutableList() }.toMutableMap()
+    fresh.forEach { (grid, list) ->
+        val target = merged.getOrPut(grid) { mutableListOf() }
+        val known = target.mapTo(mutableSetOf()) { it.call to it.epochMs }
+        list.forEach { qso ->
+            if (known.add(qso.call to qso.epochMs)) target.add(qso)
+        }
+    }
+    return merged
+}

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/repository/LoTWResult.kt

@@ -46,3 +46,6 @@ sealed class LoTWResult {
     /** Any other network-level failure (DNS, TLS, connection reset, HTTP 5xx). */
     data class NetworkError(val detail: String) : LoTWResult()
 }
+
+/** What a LoTW sync does: pull everything, or only new QSLs since the last sync. */
+enum class LoTWSyncMode { Full, Incremental }

core/domain/src/test/java/com/rtbishop/look4sat/core/domain/repository/LoTWGridSyncTest.kt

@@ -0,0 +1,290 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.repository
+
+import com.rtbishop.look4sat.core.domain.model.DatabaseState
+import com.rtbishop.look4sat.core.domain.model.DataSourcesSettings
+import com.rtbishop.look4sat.core.domain.model.GridQso
+import com.rtbishop.look4sat.core.domain.model.LoTWSettings
+import com.rtbishop.look4sat.core.domain.model.OtherSettings
+import com.rtbishop.look4sat.core.domain.model.PassesSettings
+import com.rtbishop.look4sat.core.domain.model.RCSettings
+import com.rtbishop.look4sat.core.domain.model.RadioControlSettings
+import com.rtbishop.look4sat.core.domain.model.WavelogSettings
+import com.rtbishop.look4sat.core.domain.predict.GeoPos
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.runBlocking
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class LoTWGridSyncTest {
+
+    // 2026-09-16T00:00:00Z — fixed "now" for the cursor assertions.
+    private val now = 1_789_516_800_000L
+
+    // region resolveLoTWSyncMode
+
+    @Test
+    fun resolveModeHonorsExplicitFull() {
+        assertEquals(LoTWSyncMode.Full, resolveLoTWSyncMode("BA7OPF", "BA7OPF", LoTWSyncMode.Full))
+        assertEquals(LoTWSyncMode.Full, resolveLoTWSyncMode("", "BA7OPF", LoTWSyncMode.Full))
+    }
+
+    @Test
+    fun resolveModeAllowsIncrementalOnlyForSameCallsign() {
+        assertEquals(
+            LoTWSyncMode.Incremental,
+            resolveLoTWSyncMode("BA7OPF", "BA7OPF", LoTWSyncMode.Incremental)
+        )
+        assertEquals(
+            LoTWSyncMode.Full,
+            resolveLoTWSyncMode("BG7ABC", "BA7OPF", LoTWSyncMode.Incremental)
+        )
+        assertEquals(
+            LoTWSyncMode.Full,
+            resolveLoTWSyncMode("", "BA7OPF", LoTWSyncMode.Incremental)
+        )
+    }
+
+    @Test
+    fun resolveModeForAutoSyncPicksIncrementalWhenPossible() {
+        assertEquals(LoTWSyncMode.Incremental, resolveLoTWSyncMode("BA7OPF", "BA7OPF", null))
+        assertEquals(LoTWSyncMode.Full, resolveLoTWSyncMode("BG7ABC", "BA7OPF", null))
+        assertEquals(LoTWSyncMode.Full, resolveLoTWSyncMode("", "BA7OPF", null))
+    }
+
+    // endregion
+
+    // region shouldAutoSyncLoTW
+
+    @Test
+    fun autoSyncGateRequiresEverything() {
+        val today = "20260916"
+        // Not configured.
+        assertFalse(shouldAutoSyncLoTW(false, true, "2026-09-15 10:00:00", today))
+        // LoTW auto-sync toggle off.
+        assertFalse(shouldAutoSyncLoTW(true, false, "2026-09-15 10:00:00", today))
+        // Never synced manually — first sync stays manual/full.
+        assertFalse(shouldAutoSyncLoTW(true, true, "", today))
+        // Already synced today (both legacy and current cursor formats) — ARRL rate-limit guard.
+        assertFalse(shouldAutoSyncLoTW(true, true, "20260916", today))
+        assertFalse(shouldAutoSyncLoTW(true, true, "2026-09-16 08:00:00", today))
+        // All gates open — yesterday in either format.
+        assertTrue(shouldAutoSyncLoTW(true, true, "20260915", today))
+        assertTrue(shouldAutoSyncLoTW(true, true, "2026-09-15 10:00:00", today))
+    }
+
+    // endregion
+
+    // region cursor helpers
+
+    @Test
+    fun cursorApiNormalizesLegacyAndPassesFullThrough() {
+        assertEquals("2026-09-16", lotwCursorApi("20260916"))
+        assertEquals("2026-09-16 08:16:02", lotwCursorApi("2026-09-16 08:16:02"))
+        assertEquals("", lotwCursorApi(""))
+    }
+
+    @Test
+    fun cursorDateToleratesBothFormats() {
+        assertEquals("20260916", lotwCursorDate("20260916"))
+        assertEquals("20260916", lotwCursorDate("2026-09-16 08:16:02"))
+        assertEquals("", lotwCursorDate(""))
+    }
+
+    @Test
+    fun cursorEpochMsParsesBothFormatsUtc() {
+        // 2026-09-16T00:00:00Z in both spellings.
+        assertEquals(now, lotwCursorEpochMs("20260916"))
+        assertEquals(now, lotwCursorEpochMs("2026-09-16 00:00:00"))
+        assertEquals(0L, lotwCursorEpochMs(""))
+        assertEquals(0L, lotwCursorEpochMs("garbage"))
+    }
+
+    // endregion
+
+    // region mergeGridQsos
+
+    @Test
+    fun mergeGridQsosDedupsByCallAndTime() {
+        val existing = mapOf(
+            "OL62" to listOf(qso("BA7ABC", 1000L)),
+            "OL63" to listOf(qso("BA7DEF", 2000L))
+        )
+        val fresh = mapOf(
+            // Same grid, same QSO re-delivered by an overlapping since-date.
+            "OL62" to listOf(qso("BA7ABC", 1000L)),
+            // Same grid, brand-new QSO.
+            "OL62" to listOf(qso("BA7GHI", 3000L)),
+            // New grid entirely.
+            "PM95" to listOf(qso("BA7JKL", 4000L))
+        )
+        val merged = mergeGridQsos(existing, fresh)
+        assertEquals(setOf("OL62", "OL63", "PM95"), merged.keys)
+        assertEquals(2, merged["OL62"]?.size) // BA7ABC once, BA7GHI added
+        assertEquals(1, merged["OL63"]?.size)
+        assertEquals(1, merged["PM95"]?.size)
+    }
+
+    @Test
+    fun mergeGridQsosHandlesEmptySides() {
+        val fresh = mapOf("OL62" to listOf(qso("BA7ABC", 1000L)))
+        assertEquals(fresh, mergeGridQsos(emptyMap(), fresh))
+        // An empty incremental pull must leave the stored side untouched.
+        assertEquals(fresh, mergeGridQsos(fresh, emptyMap()))
+        assertEquals(emptyMap<String, List<GridQso>>(), mergeGridQsos(emptyMap(), emptyMap()))
+    }
+
+    // endregion
+
+    // region applyLoTWGridResult
+
+    @Test
+    fun applyIncrementalMergesAndAdvancesCursor() = runBlocking {
+        val repo = FakeSettingsRepo().apply {
+            setWorkedGrids(setOf("OL62"))
+            setWorkedGridQsos(mapOf("OL62" to listOf(qso("BA7ABC", 1000L))))
+            setRoamedGrids(setOf("OL62"))
+            setLastLotwSyncDate("20260915")
+            setLastLotwSyncCallsign("BA7OPF")
+        }
+        val result = LoTWResult.Success(
+            grids = setOf("OL62", "PM95"),
+            qsos = mapOf("OL62" to listOf(qso("BA7ABC", 1000L)), "PM95" to listOf(qso("BA7GHI", 2000L))),
+            roamedGrids = setOf("PM95")
+        )
+        val count = applyLoTWGridResult(repo, result, LoTWSyncMode.Incremental, "BA7OPF", now)
+
+        assertEquals(2, count)
+        assertEquals(setOf("OL62", "PM95"), repo.getWorkedGrids())
+        assertEquals(1, repo.getWorkedGridQsos()["OL62"]?.size) // deduped
+        assertEquals(setOf("OL62", "PM95"), repo.getRoamedGrids())
+        assertEquals("2026-09-16 00:00:00", repo.getLastLotwSyncDate())
+        assertEquals("BA7OPF", repo.getLastLotwSyncCallsign())
+    }
+
+    @Test
+    fun applyFullReplacesEverythingAndAdvancesCursor() = runBlocking {
+        val repo = FakeSettingsRepo().apply {
+            setWorkedGrids(setOf("OL62", "STALE"))
+            setWorkedGridQsos(mapOf("STALE" to listOf(qso("BG7OLD", 1L))))
+            setRoamedGrids(setOf("STALE"))
+            setLastLotwSyncDate("20260910")
+            setLastLotwSyncCallsign("BG7OLD")
+        }
+        val result = LoTWResult.Success(
+            grids = setOf("PM95"),
+            qsos = mapOf("PM95" to listOf(qso("BA7GHI", 2000L))),
+            roamedGrids = setOf("PM95")
+        )
+        val count = applyLoTWGridResult(repo, result, LoTWSyncMode.Full, "BA7OPF", now)
+
+        assertEquals(1, count)
+        assertEquals(setOf("PM95"), repo.getWorkedGrids())
+        assertEquals(setOf("PM95"), repo.getWorkedGridQsos().keys)
+        assertEquals(setOf("PM95"), repo.getRoamedGrids())
+        assertEquals("2026-09-16 00:00:00", repo.getLastLotwSyncDate())
+        assertEquals("BA7OPF", repo.getLastLotwSyncCallsign())
+    }
+
+    // endregion
+
+    private fun qso(call: String, epochMs: Long): GridQso =
+        GridQso(call, epochMs, "FO-29", "FM", "70CM", "2M")
+
+    /**
+     * Minimal ISettingsRepo fake backing only the LoTW sync surface; the rest
+     * throws (mirrors the FakeSettingsRepo pattern used in feature tests).
+     */
+    private class FakeSettingsRepo : ISettingsRepo {
+        override val stationPosition: StateFlow<GeoPos> = MutableStateFlow(GeoPos(23.13, 113.26))
+        override val appVersionName: String = "test"
+        override val selectedIds: StateFlow<List<Int>> = MutableStateFlow(emptyList())
+        override val selectedTypes: StateFlow<List<String>> = MutableStateFlow(emptyList())
+        override val passesSettings: StateFlow<PassesSettings> = MutableStateFlow(
+            PassesSettings(hoursAhead = 24, minElevation = 10.0, selectedModes = emptyList())
+        )
+        override val databaseState: StateFlow<DatabaseState> = MutableStateFlow(DatabaseState(0, 0, 0L))
+        override val rcSettings: StateFlow<RCSettings> = MutableStateFlow(
+            RCSettings(false, "", "", "", false, "", "", "", 0L, false, "", "", "", false, "", "")
+        )
+        override val otherSettings: StateFlow<OtherSettings> = MutableStateFlow(
+            OtherSettings(
+                stateOfAutoUpdate = true,
+                stateOfSensors = false,
+                stateOfSweep = false,
+                stateOfUtc = false,
+                stateOfLightTheme = false,
+                stateOfNightMode = false,
+                stateOfMapGrid = false,
+                shouldSeeWarning = false,
+                shouldSeeWhatsNew = false
+            )
+        )
+        override val dataSourcesSettings: StateFlow<DataSourcesSettings> = MutableStateFlow(
+            DataSourcesSettings(satelliteUrls = emptyList(), transceiversUrls = emptyList())
+        )
+        override val dataSourcesStatus: StateFlow<Map<String, Int>> = MutableStateFlow(emptyMap())
+        override val radioControlSettings: StateFlow<RadioControlSettings> = MutableStateFlow(
+            RadioControlSettings(false, RadioControlSettings.MODEL_YAESU_FT817, "", "", "", "", 9600)
+        )
+        override val wavelogSettings: StateFlow<WavelogSettings> = MutableStateFlow(WavelogSettings())
+        override val lotwSettings: StateFlow<LoTWSettings> = MutableStateFlow(LoTWSettings())
+
+        private var workedGrids: Set<String> = emptySet()
+        private var workedGridQsos: Map<String, List<GridQso>> = emptyMap()
+        private var roamedGrids: Set<String> = emptySet()
+        private var lastSyncDate: String = ""
+        private var lastSyncCallsign: String = ""
+
+        override fun getWorkedGrids(): Set<String> = workedGrids
+        override fun setWorkedGrids(grids: Set<String>) { workedGrids = grids }
+        override fun getWorkedGridQsos(): Map<String, List<GridQso>> = workedGridQsos
+        override fun setWorkedGridQsos(qsos: Map<String, List<GridQso>>) { workedGridQsos = qsos }
+        override fun getRoamedGrids(): Set<String> = roamedGrids
+        override fun setRoamedGrids(grids: Set<String>) { roamedGrids = grids }
+        override fun getLastLotwSyncDate(): String = lastSyncDate
+        override fun setLastLotwSyncDate(date: String) { lastSyncDate = date }
+        override fun getLastLotwSyncCallsign(): String = lastSyncCallsign
+        override fun setLastLotwSyncCallsign(callsign: String) { lastSyncCallsign = callsign }
+
+        override fun setSelectedIds(ids: List<Int>) = TODO()
+        override fun setSelectedTypes(types: List<String>) = TODO()
+        override fun setPassesSettings(settings: PassesSettings) = TODO()
+        override fun setStationPosition(latitude: Double, longitude: Double, altitude: Double): Boolean = TODO()
+        override fun setStationPosition(): Boolean = TODO()
+        override fun setStationPosition(locator: String): Boolean = TODO()
+        override fun getSatelliteTypesIds(types: List<String>): List<Int> = TODO()
+        override fun setSatelliteTypeIds(type: String, ids: List<Int>) = TODO()
+        override fun updateDatabaseState(state: DatabaseState) = TODO()
+        override fun updateRCSettings(settings: RCSettings) = TODO()
+        override fun updateOtherSettings(transform: (OtherSettings) -> OtherSettings) = TODO()
+        override fun updateDataSourcesSettings(settings: DataSourcesSettings) = TODO()
+        override fun updateDataSourcesStatus(status: Map<String, Int>) = TODO()
+        override fun updateRadioControlSettings(settings: RadioControlSettings) = TODO()
+        override fun getSatelliteOffset(catnum: Int): String = ""
+        override fun setSatelliteOffset(catnum: Int, offset: String) = TODO()
+        override fun getAmSatCallsign(): String = ""
+        override fun setAmSatCallsign(callsign: String) = TODO()
+        override fun updateWavelogSettings(settings: WavelogSettings) = TODO()
+        override fun updateLoTWSettings(settings: LoTWSettings) = TODO()
+    }
+}

core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/Components.kt

@@ -375,7 +375,10 @@ fun SharedDialog(
                 overflow = TextOverflow.Ellipsis,
                 modifier = Modifier
                     .weight(1f)
-                    .padding(horizontal = if (onCancel != null && onAccept != null) padding else 0.dp)
+                    .padding(
+                        start = if (onCancel != null) padding else 0.dp,
+                        end = if (onAccept != null) padding else 0.dp
+                    )
             )
             if (onAccept != null) {
                 CardButton(

core/presentation/src/main/res/values-es/strings.xml

@@ -147,6 +147,7 @@
     <string name="prefs_other_title">Otros ajustes</string>
     <string name="prefs_other_switch_utc">Mostrar tiempos de pase en UTC</string>
     <string name="prefs_other_switch_update">Habilitar auto actualización de datos</string>
+    <string name="prefs_other_switch_lotw_sync">Sincronizar automáticamente las cuadrículas LoTW confirmadas</string>
     <string name="prefs_other_switch_sweep">Habilitar animaciones radar</string>
     <string name="prefs_other_switch_sensors">Usar sensores para rotar vista de radar</string>
     <string name="prefs_other_switch_night_mode">Activar filtro nocturno rojo</string>

core/presentation/src/main/res/values-ru/strings.xml

@@ -146,6 +146,7 @@
     <string name="prefs_other_title">Другие настройки</string>
     <string name="prefs_other_switch_utc">Показывать время по UTC</string>
     <string name="prefs_other_switch_update">Обновлять данные автоматически</string>
+    <string name="prefs_other_switch_lotw_sync">Автосинхронизация подтверждённых сеток LoTW</string>
     <string name="prefs_other_switch_sweep">Показывать анимацию радара</string>
     <string name="prefs_other_switch_sensors">Использовать сенсоры устройства</string>
     <string name="prefs_other_switch_night_mode">Включить красный ночной фильтр</string>

core/presentation/src/main/res/values-si/strings.xml

@@ -147,6 +147,7 @@
     <string name="prefs_other_title">වෙනත් සැකසුම්</string>
     <string name="prefs_other_switch_utc">පසුකර වේලාවන් UTC මගින්</string>
     <string name="prefs_other_switch_update">ස්වයං දත්ත යාවත්කාලීනය</string>
+    <string name="prefs_other_switch_lotw_sync">LoTW තහවුරු කළ ජාල ස්වයං සමමුහුර්තකරණය</string>
     <string name="prefs_other_switch_sweep">radar sweep සජීවිකරණය සබල කරන්න</string>
     <string name="prefs_other_switch_sensors">Radar දර්ශනය කරකැවීමට සංවේදක භාවිතා කරන්න </string>
     <string name="prefs_other_switch_night_mode">රතු රාත්‍රී පෙරහන සබල කරන්න</string>

core/presentation/src/main/res/values-tr/strings.xml

@@ -189,6 +189,7 @@
     <string name="prefs_other_title">Diğer ayarlar</string>
     <string name="prefs_other_switch_utc">Geçiş saatini UTC olarak göster</string>
     <string name="prefs_other_switch_update">Otomatik veri güncellemeyi etkinleştir</string>
+    <string name="prefs_other_switch_lotw_sync">LoTW onaylı kareleri otomatik senkronize et</string>
     <string name="prefs_other_switch_sweep">Radar taramasını etkinleştir</string>
     <string name="prefs_other_switch_sensors">Radar görünümünü döndürmek için sensörleri kullan</string>
     <string name="prefs_other_switch_night_mode">Kırmızı gece filtresini etkinleştir</string>
@@ -207,7 +208,7 @@
         \n• Alexandru Csete (Gpredict)
         \n• Dr T.S. Kelso (Celestrak)
         \n• Libre Space Foundation (SatNOGS)
-        \n• BG7NTA (CW decoding feature)</string>
+        \n• BG7NTA BG5JSU (CW decoding feature)</string>
     <string name="prefs_outro_license">Bu uygulama herhangi bir garanti sunmaz</string>
 
 </resources>

core/presentation/src/main/res/values-uk/strings.xml

@@ -147,6 +147,7 @@
     <string name="prefs_other_title">Інші налаштування</string>
     <string name="prefs_other_switch_utc">Показувати час в UTC</string>
     <string name="prefs_other_switch_update">Автоматичне оновлення даних</string>
+    <string name="prefs_other_switch_lotw_sync">Автосинхронізація підтверджених сіток LoTW</string>
     <string name="prefs_other_switch_sweep">Показувати анімацію радара</string>
     <string name="prefs_other_switch_sensors">Використовувати сенсори пристрою</string>
     <string name="prefs_other_switch_night_mode">Увімкнути червоний нічний фільтр</string>

core/presentation/src/main/res/values-zh/strings.xml

@@ -122,6 +122,8 @@
     <string name="map_visibility">能见度：%s</string>
     <!-- Worked-grid QSO dialog -->
     <string name="grid_qso_calls_count">%d 个呼号 · %d 次通联</string>
+    <string name="grid_qso_count_one">%d QSO</string>
+    <string name="grid_qso_count_many">%d QSOs</string>
     <string name="grid_qso_first">首通</string>
     <string name="grid_qso_no_sat">卫星未知</string>
     <string name="map_visible">日照中</string>
@@ -131,7 +133,7 @@
     <string name="prefs_privacy_title">隐私政策</string>
 
     <string name="prefs_updated_title">更新：%s</string>
-    <string name="prefs_updated_time">yyyy MMM d - HH:mm:ss</string>
+    <string name="prefs_updated_time">yyyy年M月d日 HH:mm:ss</string>
 
     <string name="prefs_loc_title">站点位置</string>
     <string name="prefs_loc_gps_title">GPS 定位</string>
@@ -158,11 +160,23 @@
     <string name="prefs_lotw_callsign">LoTW 呼号</string>
     <string name="prefs_lotw_password">LoTW 密码</string>
     <string name="prefs_lotw_hint">直接从 ARRL LoTW 拉取该呼号已确认 QSO 的网格并覆盖本地已存集合（当前 %1$d 个）。密码仅保存在手机本地。点"同步"会自动保存凭据并拉取。</string>
-    <string name="prefs_lotw_sync_duration_hint">同步通常约需 3–10 秒；首次同步或 ARRL 服务器繁忙时可能更久。</string>
     <string name="prefs_lotw_sync">同步</string>
     <string name="prefs_lotw_syncing">同步中…</string>
     <string name="prefs_lotw_configured">已从 LoTW 同步 — 共 %1$d 个网格</string>
     <string name="prefs_lotw_not_configured">未配置 — 直接登录 ARRL LoTW 拉取已确认 QSO 的网格，无需自建服务器</string>
+    <string name="lotw_sync_error_not_configured">LoTW 呼号/密码未配置</string>
+    <string name="lotw_sync_error_credentials">LoTW 同步失败——呼号或密码错误</string>
+    <string name="lotw_sync_error_rate_limited">LoTW 同步失败——服务器限流，请等几分钟后再试</string>
+    <string name="lotw_sync_error_timeout">LoTW 同步失败——连接超时，请更换网络重试</string>
+    <string name="lotw_sync_error_network">LoTW 同步失败——网络错误（%1$s）</string>
+    <string name="lotw_sync_full">全量同步</string>
+    <string name="lotw_sync_incremental">增量合并</string>
+    <string name="lotw_sync_rate_hint">下载速度约每 100 条 QSO 需 8 秒（另有 5–40 秒服务器生成时间）</string>
+    <string name="lotw_sync_progress_connecting">正在连接 LoTW 服务器…</string>
+    <string name="lotw_sync_progress_downloading">正在下载报告…</string>
+    <string name="lotw_sync_progress_saving">正在处理下载的数据…</string>
+    <string name="lotw_sync_progress_count">本次同步 %1$d 条 QSO…</string>
+    <string name="lotw_sync_progress_qso">本次同步 %1$d 条 QSO，预计还需 %2$d 秒</string>
     <string name="prefs_locator_text">使用梅登黑德网格设置站点位置</string>
 
     <string name="prefs_data_title">卫星数据更新</string>
@@ -223,6 +237,7 @@
     <string name="prefs_other_title">其他设置</string>
     <string name="prefs_other_switch_utc">以 UTC 时间显示</string>
     <string name="prefs_other_switch_update">启用卫星数据自动更新</string>
+    <string name="prefs_other_switch_lotw_sync">自动同步 LoTW 已确认网格</string>
     <string name="prefs_other_switch_sweep">启用雷达扫描动画</string>
     <string name="prefs_other_switch_sensors">使用传感器旋转雷达视图</string>
     <string name="prefs_other_switch_night_mode">启用红色夜间模式</string>
@@ -242,7 +257,7 @@
         \n• Dr T.S. Kelso (Celestrak)
         \n• Libre Space Foundation (SatNOGS)
         \n• xdsopl 和 Robot36 贡献者!
-        \n• BG7NTA（CW解码功能）</string>
+        \n• BG7NTA BG5JSU（CW解码功能）</string>
     <string name="prefs_outro_license">该应用程序不提供任何保修.</string>
 
     <!-- 匹配页 Mutual match page -->

core/presentation/src/main/res/values/strings.xml

@@ -147,6 +147,8 @@
     <string name="map_visibility">Visibility: %s</string>
     <!-- Worked-grid QSO dialog -->
     <string name="grid_qso_calls_count">%d callsigns · %d QSOs</string>
+    <string name="grid_qso_count_one">%d QSO</string>
+    <string name="grid_qso_count_many">%d QSOs</string>
     <string name="grid_qso_first">First</string>
     <string name="grid_qso_no_sat">satellite unknown</string>
     <string name="map_visible">Visible</string>
@@ -193,11 +195,23 @@
     <string name="prefs_lotw_callsign">LoTW callsign</string>
     <string name="prefs_lotw_password">LoTW password</string>
     <string name="prefs_lotw_hint">Fetch confirmed-QSO grids directly from ARRL LoTW for this callsign and replace the stored set (currently %1$d). The password is stored on this device only. Tapping Sync saves the credentials and fetches in one step.</string>
-    <string name="prefs_lotw_sync_duration_hint">A sync usually takes about 3–10 seconds; the first one or a busy ARRL server can take longer.</string>
     <string name="prefs_lotw_sync">Sync</string>
     <string name="prefs_lotw_syncing">Syncing…</string>
     <string name="prefs_lotw_configured">Synced from LoTW — %1$d grids total</string>
     <string name="prefs_lotw_not_configured">Not configured — pull confirmed grids directly from ARRL LoTW, no self-hosted server needed</string>
+    <string name="lotw_sync_error_not_configured">LoTW callsign/password not configured</string>
+    <string name="lotw_sync_error_credentials">LoTW sync failed — callsign or password incorrect</string>
+    <string name="lotw_sync_error_rate_limited">LoTW sync failed — rate limited by server, wait a few minutes and retry</string>
+    <string name="lotw_sync_error_timeout">LoTW sync failed — connection timed out, try another network</string>
+    <string name="lotw_sync_error_network">LoTW sync failed — network error (%1$s)</string>
+    <string name="lotw_sync_full">Full sync</string>
+    <string name="lotw_sync_incremental">Incremental merge</string>
+    <string name="lotw_sync_rate_hint">Download runs at ~8 s per 100 QSOs (plus 5–40 s server generation time)</string>
+    <string name="lotw_sync_progress_connecting">Connecting to LoTW…</string>
+    <string name="lotw_sync_progress_downloading">Downloading report…</string>
+    <string name="lotw_sync_progress_saving">Processing downloaded data…</string>
+    <string name="lotw_sync_progress_count">Syncing %1$d QSOs…</string>
+    <string name="lotw_sync_progress_qso">Syncing %1$d QSOs, ~%2$d s remaining</string>
     <string name="prefs_locator_text">Set station\'s position using locator</string>
 
     <string name="prefs_data_title">Satellite data</string>
@@ -257,6 +271,7 @@
     <string name="prefs_other_title">Other settings</string>
     <string name="prefs_other_switch_utc">Show pass time in UTC</string>
     <string name="prefs_other_switch_update">Enable automatic data update</string>
+    <string name="prefs_other_switch_lotw_sync">Auto-sync LoTW confirmed grids</string>
     <string name="prefs_other_switch_sweep">Enable radar sweep animation</string>
     <string name="prefs_other_switch_sensors">Use sensors to rotate radar view</string>
     <string name="prefs_other_switch_night_mode">Enable red night mode filter</string>
@@ -276,7 +291,7 @@
         \n* Dr T.S. Kelso (Celestrak)
         \n* Libre Space Foundation (SatNOGS)
         \n* xdsopl and Robot36 contributors!
-        \n* BG7NTA (CW decoding feature)
+        \n* BG7NTA BG5JSU (CW decoding feature)
     </string>
     <string name="prefs_outro_license">The app comes with no warranty</string>
 

feature/map/src/main/assets/awards/dxcc.json

@@ -1 +1 @@
-{"type":"dxcc","regions":[{"id":0,"code":176,"name":"Fiji","label_lon":177.9759,"label_lat":-17.9376,"rings":[[[180.0,-16.0671],[180.0,-16.5552],[179.3641,-16.8014],[178.7251,-17.012],[178.5968,-16.6392],[179.0966,-16.434],[179.4135,-16.3791]],[[178.1256,-17.5048],[178.3736,-17.3399],[178.7181,-17.6285],[178.5527,-18.1506],[177.9327,-18.288],[177.3815,-18.1643],[177.285,-17.7247],[177.6709,-17.3811]],[[-179.7933,-16.0209],[-179.9174,-16.5018],[-180.0,-16.5552],[-180.0,-16.0671]]]},{"id":1,"code":470,"name":"Tanzania","label_lon":34.1421,"label_lat":-6.2078,"rings":[[[33.9037,-0.95],[34.0726,-1.0598],[37.6987,-3.097],[37.7669,-3.6771],[39.2022,-4.6768],[38.7405,-5.9089],[38.7998,-6.4757],[39.44,-6.84],[39.47,-7.1],[39.1947,-7.7039],[39.252,-8.0078],[39.1865,-8.4855],[39.5357,-9.1124],[39.9496,-10.0984],[40.3166,-10.3171],[40.3166,-10.3171],[39.521,-10.8969],[38.4276,-11.2852],[37.8276,-11.2688],[37.4713,-11.5688],[36.7752,-11.5945],[36.5141,-11.7209],[35.3124,-11.4391],[34.56,-11.52],[34.28,-10.16],[33.9408,-9.6937],[33.7397,-9.4171],[32.7594,-9.2306],[32.1919,-8.9304],[31.5563,-8.762],[31.1578,-8.5946],[30.74,-8.34],[30.74,-8.34],[30.2,-7.08],[29.62,-6.52],[29.42,-5.94],[29.52,-5.42],[29.34,-4.5],[29.7535,-4.4524],[30.1163,-4.0901],[30.5055,-3.5686],[30.7522,-3.3593],[30.743,-3.0343],[30.5277,-2.8076],[30.4697,-2.4139],[30.4697,-2.4138],[30.7583,-2.2872],[30.8161,-1.6989],[30.4191,-1.1347],[30.7699,-1.0146],[31.8662,-1.0274]]]},{"id":2,"code":302,"name":"W. 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feature/map/src/main/assets/awards/waz.json

@@ -1 +1 @@
-{"type":"waz","regions":[{"id":1,"code":"1","name":"1","label_lon":-140,"label_lat":75,"rings":[[[-109.0,85.0],[-109.0,77.5],[-103.2588,75.2824],[-103.4495,72.3827],[-99.2896,70.6113],[-102.0,68.0],[-102.0,60.0],[-139.0569,60.0001],[-138.7074,59.9061],[-138.6686,59.8091],[-138.626,59.7686],[-137.6062,59.2436],[-137.5007,58.9835],[-137.5266,58.9059],[-137.4512,58.9081],[-137.281,59.001],[-136.8272,59.1604],[-136.5843,59.166],[-136.4897,59.2595],[-136.4956,59.2754],[-136.4695,59.284],[-136.4771,59.4656],[-136.3681,59.449],[-136.3055,59.4644],[-136.2387,59.5242],[-136.2393,59.5592],[-136.3538,59.5998],[-136.1933,59.6401],[-135.9529,59.6622],[-135.4793,59.798],[-135.3601,59.7376],[-135.2336,59.6962],[-135.2198,59.6627],[-135.1575,59.6257],[-135.1179,59.6231],[-135.0289,59.5637],[-135.0275,59.4748],[-135.101,59.4276],[-134.9897,59.3871],[-135.0305,59.3466],[-134.9596,59.2808],[-134.7007,59.2489],[-134.6793,59.1925],[-134.5659,59.1312],[-134.4831,59.1316],[-134.3821,59.0386],[-134.4072,58.9796],[-134.3138,58.962],[-134.3365,58.9235],[-134.2579,58.8612],[-133.8404,58.7293],[-133.7068,58.6117],[-133.3772,58.4303],[-133.462,58.3879],[-133.346,58.2769],[-133.1722,58.1536],[-133.0701,58.0002],[-132.8689,57.8393],[-132.7512,57.6962],[-132.5542,57.4971],[-132.37,57.35],[-132.2487,57.2116],[-132.3688,57.0917],[-132.0449,57.045],[-132.1237,56.8739],[-131.8735,56.806],[-131.9009,56.7537],[-131.8604,56.703],[-131.8353,56.5994],[-131.5815,56.6123],[-131.4716,56.5523],[-131.1726,56.4494],[-131.0884,56.4062],[-130.7825,56.3671],[-130.6242,56.2672],[-130.4683,56.2431],[-130.4264,56.1415],[-130.2468,56.0966],[-130.104,56.1229],[-130.0037,56.0081],[-130.0178,55.9119],[-130.0041,55.9074],[-130.1524,55.7664],[-130.1481,55.7152],[-130.1118,55.6829],[-130.1281,55.5809],[-130.09,55.498],[-130.0413,55.4517],[-130.0211,55.3379],[-129.9742,55.282],[-130.1029,55.1926],[-130.1876,55.0629],[-130.346,54.9177],[-130.5682,54.7922],[-130.6591,54.7631],[-130.6257,54.7381],[-130.6156,54.7074],[-134.5376,54.2944],[-140.0,50.0],[-140.0,40.0],[-190.0,40.0],[-190.0,53.0],[-167.6871,66.6671],[-180.0,75.0],[-180.0,85.0]]]},{"id":2,"code":"2","name":"2","label_lon":-82.5,"label_lat":70,"rings":[[[-109.0,85.0],[-109.0,77.5],[-103.2588,75.2824],[-103.4495,72.3827],[-99.2896,70.6113],[-102.0,68.0],[-102.0,60.0],[-85.0,60.0],[-80.8725,54.5159],[-79.7772,51.8514],[-79.6522,51.6179],[-79.5157,51.4606],[-79.5176,50.0],[-60.0,50.0],[-55.9546,51.7455],[-55.4041,51.765],[-49.0,53.0],[-52.2437,59.5838],[-57.8076,67.1394],[-67.854,74.2269],[-74.0332,75.4972],[-74.8618,77.4191],[-73.5809,78.5637],[-69.8831,79.5013],[-68.2947,80.439],[-60.0073,82.2668],[-60.0,85.0]]]},{"id":3,"code":"3","name":"3","label_lon":-125,"label_lat":45,"rings":[[[-120.0,60.0],[-139.0569,60.0001],[-138.7074,59.9061],[-138.6686,59.8091],[-138.626,59.7686],[-137.6062,59.2436],[-137.5007,58.9835],[-137.5266,58.9059],[-137.4512,58.9081],[-137.281,59.001],[-136.8272,59.1604],[-136.5843,59.166],[-136.4897,59.2595],[-136.4956,59.2754],[-136.4695,59.284],[-136.4771,59.4656],[-136.3681,59.449],[-136.3055,59.4644],[-136.2387,59.5242],[-136.2393,59.5592],[-136.3538,59.5998],[-136.1933,59.6401],[-135.9529,59.6622],[-135.4793,59.798],[-135.3601,59.7376],[-135.2336,59.6962],[-135.2198,59.6627],[-135.1575,59.6257],[-135.1179,59.6231],[-135.0289,59.5637],[-135.0275,59.4748],[-135.101,59.4276],[-134.9897,59.3871],[-135.0305,59.3466],[-134.9596,59.2808],[-134.7007,59.2489],[-134.6793,59.1925],[-134.5659,59.1312],[-134.4831,59.1316],[-134.3821,59.0386],[-134.4072,58.9796],[-134.3138,58.962],[-134.3365,58.9235],[-134.2579,58.8612],[-133.8404,58.7293],[-133.7068,58.6117],[-133.3772,58.4303],[-133.462,58.3879],[-133.346,58.2769],[-133.1722,58.1536],[-133.0701,58.0002],[-132.8689,57.8393],[-132.7512,57.6962],[-132.5542,57.4971],[-132.37,57.35],[-132.2487,57.2116],[-132.3688,57.0917],[-132.0449,57.045],[-132.1237,56.8739],[-131.8735,56.806],[-131.9009,56.7537],[-131.8604,56.703],[-131.8353,56.5994],[-131.5815,56.6123],[-131.4716,56.5523],[-131.1726,56.4494],[-131.0884,56.4062],[-130.7825,56.3671],[-130.6242,56.2672],[-130.4683,56.2431],[-130.4264,56.1415],[-130.2468,56.0966],[-130.104,56.1229],[-130.0037,56.0081],[-130.0178,55.9119],[-130.0041,55.9074],[-130.1524,55.7664],[-130.1481,55.7152],[-130.1118,55.6829],[-130.1281,55.5809],[-130.09,55.498],[-130.0413,55.4517],[-130.0211,55.3379],[-129.9742,55.282],[-130.1029,55.1926],[-130.1876,55.0629],[-130.346,54.9177],[-130.5682,54.7922],[-130.6591,54.7631],[-130.6257,54.7381],[-130.6156,54.7074],[-134.5376,54.2944],[-140.0,50.0],[-140.0,40.0],[-130.0,40.0],[-130.0,32.5],[-120.0,32.5],[-117.1249,32.534],[-114.7197,32.7187],[-114.7643,32.6427],[-114.8087,32.6191],[-114.7997,32.5924],[-114.8137,32.5613],[-114.7932,32.5696],[-114.7916,32.5558],[-114.8057,32.5467],[-114.8135,32.4943],[-111.0748,31.3322],[-109.05,31.3325],[-109.0501,41.0007],[-111.0467,40.9979],[-111.049,44.474],[-111.1227,44.4937],[-111.1394,44.5171],[-111.1317,44.5326],[-111.177,44.5509],[-111.1808,44.569Line truncated
+{"type":"waz","regions":[{"id":1,"code":"1","name":"1","label_lon":-140,"label_lat":75,"rings":[[[-109.0,85.0],[-109.0,77.5],[-103.2588,75.2824],[-103.4495,72.3827],[-99.2896,70.6113],[-102.0,68.0],[-102.0,60.0],[-139.0569,60.0001],[-138.7074,59.9061],[-138.6686,59.8091],[-138.626,59.7686],[-137.6062,59.2436],[-137.5007,58.9835],[-137.5266,58.9059],[-137.4512,58.9081],[-137.281,59.001],[-136.8272,59.1604],[-136.5843,59.166],[-136.4897,59.2595],[-136.4956,59.2754],[-136.4695,59.284],[-136.4771,59.4656],[-136.3681,59.449],[-136.3055,59.4644],[-136.2387,59.5242],[-136.2393,59.5592],[-136.3538,59.5998],[-136.1933,59.6401],[-135.9529,59.6622],[-135.4793,59.798],[-135.3601,59.7376],[-135.2336,59.6962],[-135.2198,59.6627],[-135.1575,59.6257],[-135.1179,59.6231],[-135.0289,59.5637],[-135.0275,59.4748],[-135.101,59.4276],[-134.9897,59.3871],[-135.0305,59.3466],[-134.9596,59.2808],[-134.7007,59.2489],[-134.6793,59.1925],[-134.5659,59.1312],[-134.4831,59.1316],[-134.3821,59.0386],[-134.4072,58.9796],[-134.3138,58.962],[-134.3365,58.9235],[-134.2579,58.8612],[-133.8404,58.7293],[-133.7068,58.6117],[-133.3772,58.4303],[-133.462,58.3879],[-133.346,58.2769],[-133.1722,58.1536],[-133.0701,58.0002],[-132.8689,57.8393],[-132.7512,57.6962],[-132.5542,57.4971],[-132.37,57.35],[-132.2487,57.2116],[-132.3688,57.0917],[-132.0449,57.045],[-132.1237,56.8739],[-131.8735,56.806],[-131.9009,56.7537],[-131.8604,56.703],[-131.8353,56.5994],[-131.5815,56.6123],[-131.4716,56.5523],[-131.1726,56.4494],[-131.0884,56.4062],[-130.7825,56.3671],[-130.6242,56.2672],[-130.4683,56.2431],[-130.4264,56.1415],[-130.2468,56.0966],[-130.104,56.1229],[-130.0037,56.0081],[-130.0178,55.9119],[-130.0041,55.9074],[-130.1524,55.7664],[-130.1481,55.7152],[-130.1118,55.6829],[-130.1281,55.5809],[-130.09,55.498],[-130.0413,55.4517],[-130.0211,55.3379],[-129.9742,55.282],[-130.1029,55.1926],[-130.1876,55.0629],[-130.346,54.9177],[-130.5682,54.7922],[-130.6591,54.7631],[-130.6257,54.7381],[-130.6156,54.7074],[-134.5376,54.2944],[-140.0,50.0],[-140.0,40.0],[-190.0,40.0],[-190.0,53.0],[-167.6871,66.6671],[-180.0,75.0],[-180.0,85.0],[-109.0,85.0]]]},{"id":2,"code":"2","name":"2","label_lon":-82.5,"label_lat":70,"rings":[[[-109.0,85.0],[-109.0,77.5],[-103.2588,75.2824],[-103.4495,72.3827],[-99.2896,70.6113],[-102.0,68.0],[-102.0,60.0],[-85.0,60.0],[-80.8725,54.5159],[-79.7772,51.8514],[-79.6522,51.6179],[-79.5157,51.4606],[-79.5176,50.0],[-60.0,50.0],[-55.9546,51.7455],[-55.4041,51.765],[-49.0,53.0],[-52.2437,59.5838],[-57.8076,67.1394],[-67.854,74.2269],[-74.0332,75.4972],[-74.8618,77.4191],[-73.5809,78.5637],[-69.8831,79.5013],[-68.2947,80.439],[-60.0073,82.2668],[-60.0,85.0],[-109.0,85.0]]]},{"id":3,"code":"3","name":"3","label_lon":-125,"label_lat":45,"rings":[[[-120.0,60.0],[-139.0569,60.0001],[-138.7074,59.9061],[-138.6686,59.8091],[-138.626,59.7686],[-137.6062,59.2436],[-137.5007,58.9835],[-137.5266,58.9059],[-137.4512,58.9081],[-137.281,59.001],[-136.8272,59.1604],[-136.5843,59.166],[-136.4897,59.2595],[-136.4956,59.2754],[-136.4695,59.284],[-136.4771,59.4656],[-136.3681,59.449],[-136.3055,59.4644],[-136.2387,59.5242],[-136.2393,59.5592],[-136.3538,59.5998],[-136.1933,59.6401],[-135.9529,59.6622],[-135.4793,59.798],[-135.3601,59.7376],[-135.2336,59.6962],[-135.2198,59.6627],[-135.1575,59.6257],[-135.1179,59.6231],[-135.0289,59.5637],[-135.0275,59.4748],[-135.101,59.4276],[-134.9897,59.3871],[-135.0305,59.3466],[-134.9596,59.2808],[-134.7007,59.2489],[-134.6793,59.1925],[-134.5659,59.1312],[-134.4831,59.1316],[-134.3821,59.0386],[-134.4072,58.9796],[-134.3138,58.962],[-134.3365,58.9235],[-134.2579,58.8612],[-133.8404,58.7293],[-133.7068,58.6117],[-133.3772,58.4303],[-133.462,58.3879],[-133.346,58.2769],[-133.1722,58.1536],[-133.0701,58.0002],[-132.8689,57.8393],[-132.7512,57.6962],[-132.5542,57.4971],[-132.37,57.35],[-132.2487,57.2116],[-132.3688,57.0917],[-132.0449,57.045],[-132.1237,56.8739],[-131.8735,56.806],[-131.9009,56.7537],[-131.8604,56.703],[-131.8353,56.5994],[-131.5815,56.6123],[-131.4716,56.5523],[-131.1726,56.4494],[-131.0884,56.4062],[-130.7825,56.3671],[-130.6242,56.2672],[-130.4683,56.2431],[-130.4264,56.1415],[-130.2468,56.0966],[-130.104,56.1229],[-130.0037,56.0081],[-130.0178,55.9119],[-130.0041,55.9074],[-130.1524,55.7664],[-130.1481,55.7152],[-130.1118,55.6829],[-130.1281,55.5809],[-130.09,55.498],[-130.0413,55.4517],[-130.0211,55.3379],[-129.9742,55.282],[-130.1029,55.1926],[-130.1876,55.0629],[-130.346,54.9177],[-130.5682,54.7922],[-130.6591,54.7631],[-130.6257,54.7381],[-130.6156,54.7074],[-134.5376,54.2944],[-140.0,50.0],[-140.0,40.0],[-130.0,40.0],[-130.0,32.5],[-120.0,32.5],[-117.1249,32.534],[-114.7197,32.7187],[-114.7643,32.6427],[-114.8087,32.6191],[-114.7997,32.5924],[-114.8137,32.5613],[-114.7932,32.5696],[-114.7916,32.5558],[-114.8057,32.5467],[-114.8135,32.4943],[-111.0748,31.3322],[-109.05,31.3325],[-109.0501,41.0007],[-111.0467,40.9979],[-111.049,44.474],[-111.1227,44.4937],[-111.1394,44.5171],[-111.1317,44.5326],[-111.17Line truncated

feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MaidenheadGridOverlay.kt

@@ -226,7 +226,7 @@ class MaidenheadGridOverlay : Overlay() {
                         if (xRight < 0f || xLeft > canvas.width) continue
                         val label = cellLabel(lat, lon, zoom)
                         if (label in roamedGrids && label != ownGrid) {
-                            drawStripes(canvas, xLeft, yTop, xRight, yBottom)
+                            drawStripes(canvas, xLeft, yTop, xRight, yBottom, zoom)
                         }
                     }
                 }
@@ -246,7 +246,7 @@ class MaidenheadGridOverlay : Overlay() {
                         val xRight = xRightBase + turn * worldWidthPx.toFloat()
                         if (xRight < 0f || xLeft > canvas.width) continue
                         if (yBottom < 0f || yTop > canvas.height) continue
-                        drawStripes(canvas, xLeft, yTop, xRight, yBottom)
+                        drawStripes(canvas, xLeft, yTop, xRight, yBottom, zoom)
                     }
                 }
             }
@@ -396,17 +396,21 @@ class MaidenheadGridOverlay : Overlay() {
      * rectangle, from top-left to bottom-right. The paint is nearly opaque so
      * stripes stay blue even over a green worked fill underneath.
      */
-    private fun drawStripes(canvas: Canvas, xLeft: Float, yTop: Float, xRight: Float, yBottom: Float) {
+    private fun drawStripes(canvas: Canvas, xLeft: Float, yTop: Float, xRight: Float, yBottom: Float, zoom: Double) {
         if (xRight <= xLeft || yBottom <= yTop) return
         canvas.save()
         canvas.clipRect(xLeft, yTop, xRight, yBottom)
         val height = yBottom - yTop
+        // Geographic density is kept constant: spacing is the reference pixel
+        // spacing (STRIPE_SPACING_PX at the map's max zoom) scaled by 2^(zoom-max),
+        // so stripes shrink/grow with the map instead of staying fixed on screen.
+        val spacing = STRIPE_SPACING_PX * Math.pow(2.0, zoom - MAX_GRID_ZOOM).toFloat()
         // Start one stripe-width left of the cell so the top-left corner is
         // always covered; each stripe runs from (x, top) to (x+height, bottom).
         var x = xLeft - height
         while (x < xRight) {
             canvas.drawLine(x, yTop, x + height, yBottom, roamStripePaint)
-            x += STRIPE_SPACING_PX
+            x += spacing
         }
         canvas.restore()
     }
@@ -428,7 +432,15 @@ class MaidenheadGridOverlay : Overlay() {
 
     /** Y pixel for a latitude, or null when outside the viewport. */
     private fun projectionToY(projection: Projection, lat: Double): Float? {
-        val geo = org.osmdroid.util.GeoPoint(lat, 0.0)
+        // Web Mercator is undefined beyond ±85.0511° (osmdroid clamps the world
+        // to TileSystemWebMercator limits). Projecting the polar field rows
+        // (lat=±90: Maidenhead row R = 80..90°N, row A = -90..-80°S) yields
+        // ±9.2e18 pixel coordinates that the canvas cannot rasterize, so the
+        // polar grid lines silently vanish. Clamp to the Mercator limit: the
+        // polar rows then project onto the screen edge and their lines are
+        // drawn (the off-limit sliver beyond 85.05° is invisible anyway).
+        val clamped = lat.coerceIn(-MAX_MERCATOR_LAT, MAX_MERCATOR_LAT)
+        val geo = org.osmdroid.util.GeoPoint(clamped, 0.0)
         val p = projection.toPixels(geo, null)
         return p.y.toFloat()
     }
@@ -484,6 +496,9 @@ class MaidenheadGridOverlay : Overlay() {
         const val FIELD_LON = 20.0
         const val SUB_SQUARE_LAT = 1.0
         const val SUB_SQUARE_LON = 2.0
+        // Web Mercator latitude limit (osmdroid TileSystemWebMercator): projecting
+        // beyond it produces ±9.2e18 pixel coordinates the canvas cannot draw.
+        const val MAX_MERCATOR_LAT = 85.05112877980658
         // Zoom at which the 2°x1° sub-square grid lines/fills appear.
         // 5.0 → 6.0: at zoom 5 a full field spans too little screen width and
         // the sub-square grid is too dense to read; 6 roughly doubles the
@@ -498,5 +513,12 @@ class MaidenheadGridOverlay : Overlay() {
         // 44f spacing (was 16f — too dense per user) with 14f-wide stripes;
         // sparse GridMaster-style zebra.
         const val STRIPE_SPACING_PX = 44f
+        /**
+         * Reference zoom for stripe spacing: the map's max zoom (MapScreen sets
+         * maxZoomLevel = 7.0). At this zoom stripes are STRIPE_SPACING_PX apart;
+         * at lower zooms spacing scales by 2^(zoom-max) so the geographic
+         * density matches the max-zoom look at every level.
+         */
+        const val MAX_GRID_ZOOM = 7.0
     }
 }

feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapScreen.kt

@@ -29,6 +29,7 @@ import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.IntrinsicSize
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -181,11 +182,38 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
     var selectedAward by remember { mutableStateOf<AwardType?>(AwardType.VUCC) }
     // Six-award progress derived from the confirmed QSO store; recomputed when
     // the store changes (LoTW/Wavelog sync).
-    val awardProgress: List<AwardProgress> = remember(uiState.workedGridQsos) {
-        AwardCalculator.calculate(uiState.workedGridQsos)
+    // Per operated-grid VUCC breakdown: myGrid -> set of worked grids worked from it.
+    val vuccByMyGrid: Map<String, Set<String>> = remember(uiState.workedGridQsos) {
+        val m = mutableMapOf<String, MutableSet<String>>()
+        for ((grid, qsos) in uiState.workedGridQsos) {
+            for (q in qsos) {
+                val mg = q.myGrid ?: continue
+                m.getOrPut(mg) { mutableSetOf() }.add(grid)
+            }
+        }
+        m
+    }
+    // Selected operated grid for VUCC counting; defaults to the grid with the
+    // most worked grids. Null when the store carries no per-QSO myGrid data
+    // (requires a LoTW resync) — then VUCC falls back to the global count.
+    var selectedMyGrid by remember(vuccByMyGrid) {
+        mutableStateOf(vuccByMyGrid.maxByOrNull { it.value.size }?.key)
+    }
+    val awardProgress: List<AwardProgress> = remember(uiState.workedGridQsos, vuccByMyGrid, selectedMyGrid) {
+        val vuccGrids = selectedMyGrid?.let { vuccByMyGrid[it].orEmpty() }
+        val base = AwardCalculator.calculate(uiState.workedGridQsos)
+        if (vuccGrids == null) base
+        else base.map { p ->
+            if (p.type == AwardType.VUCC) p.copy(workedKeys = vuccGrids, count = vuccGrids.size) else p
+        }
+    }
+    // Worked grids drawn on the map: filtered by the selected operated grid
+    // (null = all operated grids). Drives both the green fills and the tap
+    // listener below, so switching the selector changes which cells are green.
+    val workedGrids = remember(uiState.workedGrids, vuccByMyGrid, selectedMyGrid) {
+        if (selectedMyGrid == null) uiState.workedGrids
+        else vuccByMyGrid[selectedMyGrid] ?: emptySet()
     }
-    // Attach the tap listener whenever grid mode / worked grids change.
-    val workedGrids = uiState.workedGrids
     val isGridMode = uiState.isGridMode
     DisposableEffect(isGridMode, workedGrids) {
         val receiver = object : org.osmdroid.events.MapEventsReceiver {
@@ -274,7 +302,7 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
                         // stationPosition would swallow the centering forever.
                         val shouldCenter = uiState.isGridMode && !prevGridMode
                         setGridMode(
-                            uiState.isGridMode, uiState.workedGrids, uiState.roamedGrids, view,
+                            uiState.isGridMode, workedGrids, uiState.roamedGrids, view,
                             uiState.stationPosition,
                             centerOnStation = shouldCenter
                         )
@@ -298,6 +326,19 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
                         if (isVertical) MapDataCard(mapData) else MapDataCards(mapData)
                     }
                 }
+                // Top-left: operated-grid selector for VUCC counting (grid mode only).
+                // Shown whenever per-grid QSO data exists; "All" (null) is available.
+                if (uiState.isGridMode && selectedAward == AwardType.VUCC && vuccByMyGrid.isNotEmpty()) {
+                    VuccGridSelector(
+                        options = vuccByMyGrid,
+                        allCount = uiState.workedGrids.size,
+                        selected = selectedMyGrid,
+                        onSelect = { selectedMyGrid = it },
+                        modifier = Modifier
+                            .align(Alignment.TopStart)
+                            .padding(8.dp)
+                    )
+                }
                 GridModeToggle(
                     isGridMode = uiState.isGridMode,
                     onToggle = { onAction(MapAction.ToggleGridMode(it)) },
@@ -400,18 +441,36 @@ private fun WorkedGridCallRow(
                 style = MaterialTheme.typography.titleMedium,
                 fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace,
                 color = MaterialTheme.colorScheme.tertiary,
+                maxLines = 1,
+                overflow = androidx.compose.ui.text.style.TextOverflow.Ellipsis,
                 modifier = Modifier.weight(1f)
             )
             Text(
-                text = formatDate(first.epochMs, isUtc),
+                // Plurals resources don't work for zh (only 'other' matches), so
+                // pick the singular/plural string explicitly.
+                text = if (callQsos.size == 1) stringResource(R.string.grid_qso_count_one, 1)
+                else stringResource(R.string.grid_qso_count_many, callQsos.size),
                 style = MaterialTheme.typography.bodySmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
-            )
-            Text(
-                text = if (expanded) " ▴" else " ▾",
-                fontSize = 18.sp,
-                color = MaterialTheme.colorScheme.primary
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                textAlign = androidx.compose.ui.text.style.TextAlign.Center,
+                modifier = Modifier.weight(1f)
             )
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.End,
+                modifier = Modifier.weight(1f)
+            ) {
+                Text(
+                    text = formatDate(first.epochMs, isUtc),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+                Text(
+                    text = if (expanded) " ▴" else " ▾",
+                    fontSize = 18.sp,
+                    color = MaterialTheme.colorScheme.primary
+                )
+            }
         }
         // First-QSO summary line, always visible.
         Text(
@@ -579,6 +638,97 @@ private fun AwardChipsRow(
     }
 }
 
+/**
+ * Compact pill toggle for switching between satellite view and grid mode,
+ * floated over the map's top-right corner. The label reflects the active
+ * mode ("Grid mode" when ON, "Satellite mode" when OFF). Semi-transparent
+ * background keeps the map readable underneath.
+ */
+@Composable
+private fun VuccGridSelector(
+    options: Map<String, Set<String>>,
+    allCount: Int,
+    selected: String?,
+    onSelect: (String?) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    var expanded by remember { mutableStateOf(false) }
+    // Most-worked grid first; selection is made on tap. "All" sits last.
+    val sorted = remember(options) { options.entries.sortedByDescending { it.value.size } }
+    Surface(
+        color = ComposeColor.Black.copy(alpha = 0.45f),
+        shape = RoundedCornerShape(8.dp),
+        modifier = modifier
+    ) {
+        // Width = widest child (header or list item), never the full screen:
+        // the expanded rows use fillMaxWidth, which would otherwise stretch
+        // this box to the whole map width.
+        Column(modifier = Modifier.width(IntrinsicSize.Max)) {
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .clickable { expanded = !expanded }
+                    .padding(start = 10.dp, end = 6.dp, top = 4.dp, bottom = 4.dp)
+            ) {
+                Text(
+                    text = if (selected == null) "All ($allCount)"
+                    else "$selected (${options[selected]?.size ?: 0})",
+                    color = ComposeColor.White,
+                    fontSize = 12.sp,
+                    fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace
+                )
+                Text(
+                    text = if (expanded) " ▴" else " ▾",
+                    fontSize = 18.sp,
+                    color = MaterialTheme.colorScheme.primary,
+                    modifier = Modifier.padding(start = 4.dp)
+                )
+            }
+            if (expanded) {
+                androidx.compose.material3.HorizontalDivider(color = ComposeColor.White.copy(alpha = 0.2f))
+                sorted.forEach { (grid, grids) ->
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .clickable {
+                                onSelect(grid)
+                                expanded = false
+                            }
+                            .padding(horizontal = 10.dp, vertical = 3.dp)
+                    ) {
+                        Text(
+                            text = "$grid (${grids.size})",
+                            color = if (grid == selected) MaterialTheme.colorScheme.primary else ComposeColor.White,
+                            fontSize = 12.sp,
+                            fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace
+                        )
+                    }
+                }
+                // "All" always listed last: shows every worked grid combined.
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .clickable {
+                            onSelect(null)
+                            expanded = false
+                        }
+                        .padding(horizontal = 10.dp, vertical = 3.dp)
+                ) {
+                    Text(
+                        text = "All ($allCount)",
+                        color = if (selected == null) MaterialTheme.colorScheme.primary else ComposeColor.White,
+                        fontSize = 12.sp,
+                        fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace
+                    )
+                }
+            }
+        }
+    }
+}
+
 /**
  * Compact pill toggle for switching between satellite view and grid mode,
  * floated over the map's top-right corner. The label reflects the active

feature/mutual/src/main/java/com/rtbishop/look4sat/feature/mutual/ElevationCurveChart.kt

@@ -45,6 +45,7 @@ import com.rtbishop.look4sat.core.presentation.R
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
+import java.util.TimeZone
 import kotlin.math.roundToInt
 
 /**
@@ -58,6 +59,7 @@ fun ElevationCurveChart(
     startTime: Long,
     endTime: Long,
     maxElev: Double,
+    isUtc: Boolean = false,
     progress: Float = 0.5f,
     onProgressChange: (Float) -> Unit = {},
     modifier: Modifier = Modifier
@@ -74,7 +76,11 @@ fun ElevationCurveChart(
     val textColorArgb = textColor.toArgb()
     val onSurfaceArgb = onSurfaceColor.toArgb()
     val gridColorArgb = gridColor.toArgb()
-    val timeFormat = remember { SimpleDateFormat("HH:mm", Locale.getDefault()) }
+    val timeFormat = remember(isUtc) {
+        SimpleDateFormat("HH:mm", Locale.getDefault()).apply {
+            if (isUtc) timeZone = TimeZone.getTimeZone("UTC")
+        }
+    }
 
     Column(modifier = modifier.fillMaxWidth()) {
         Canvas(

feature/mutual/src/main/java/com/rtbishop/look4sat/feature/mutual/MutualScreen.kt

@@ -29,6 +29,7 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.itemsIndexed
@@ -40,6 +41,7 @@ import androidx.compose.material3.ElevatedCard
 import androidx.compose.material3.FilterChip
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.OutlinedTextField
@@ -71,6 +73,7 @@ import com.rtbishop.look4sat.core.presentation.isVerticalLayout
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
+import java.util.TimeZone
 
 @Composable
 fun MutualScreen(
@@ -186,7 +189,11 @@ private fun MutualContent(
     onHoursAhead: (Int) -> Unit,
     onClearError: () -> Unit
 ) {
-    val timeFormat = remember { SimpleDateFormat("MM/dd HH:mm", Locale.getDefault()) }
+    val timeFormat = remember(state.isUtc) {
+        SimpleDateFormat("MM/dd HH:mm", Locale.getDefault()).apply {
+            if (state.isUtc) timeZone = TimeZone.getTimeZone("UTC")
+        }
+    }
 
     LazyColumn(
         modifier = Modifier.fillMaxSize(),
@@ -323,6 +330,7 @@ private fun MutualContent(
                 pass = pass,
                 isExpanded = state.selectedPassIndex == index,
                 timeFormat = timeFormat,
+                isUtc = state.isUtc,
                 minElevA = state.stationAMinElev,
                 minElevB = state.stationBMinElev,
                 onClick = { onSelectPass(if (state.selectedPassIndex == index) -1 else index) },
@@ -527,6 +535,7 @@ private fun MutualPassCard(
     pass: MutualPass,
     isExpanded: Boolean,
     timeFormat: SimpleDateFormat,
+    isUtc: Boolean,
     minElevA: Double,
     minElevB: Double,
     onClick: () -> Unit,
@@ -558,39 +567,62 @@ private fun MutualPassCard(
             .clickable(onClick = onClick)
     ) {
         Column(modifier = Modifier.padding(12.dp)) {
-            Row(
-                modifier = Modifier.fillMaxWidth(),
-                horizontalArrangement = Arrangement.SpaceBetween,
-                verticalAlignment = Alignment.CenterVertically
-            ) {
-                Text(
-                    text = pass.name,
-                    style = MaterialTheme.typography.bodyLarge,
-                    fontWeight = FontWeight.Medium,
-                    color = MaterialTheme.colorScheme.primary,
-                    modifier = Modifier.weight(1f)
-                )
-                Text(
-                    text = "${timeFormat.format(Date(pass.startTime))} - ${timeFormat.format(Date(pass.endTime))}",
-                    style = MaterialTheme.typography.bodySmall,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant
-                )
-            }
-            Spacer(Modifier.height(4.dp))
-            Row(
-                modifier = Modifier.fillMaxWidth(),
-                horizontalArrangement = Arrangement.SpaceBetween
-            ) {
-                Text(
-                    text = stringResource(R.string.mutual_elevation_you, pass.maxElevationA.toInt()),
-                    style = MaterialTheme.typography.bodySmall,
-                    color = MaterialTheme.colorScheme.primary
-                )
-                Text(
-                    text = stringResource(R.string.mutual_elevation_opposite, pass.maxElevationB.toInt()),
-                    style = MaterialTheme.typography.bodySmall,
-                    color = MaterialTheme.colorScheme.tertiary
-                )
+            // Header: pass info (name/time + elevations) on the left, and a
+            // larger radar shortcut on the right that spans both rows vertically.
+            // The pass info column narrows, so the "Opposite" elevation shifts
+            // left to make room for the taller button.
+            Row(verticalAlignment = Alignment.CenterVertically) {
+                Column(modifier = Modifier.weight(1f)) {
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.SpaceBetween,
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        Text(
+                            text = pass.name,
+                            style = MaterialTheme.typography.bodyLarge,
+                            fontWeight = FontWeight.Medium,
+                            color = MaterialTheme.colorScheme.primary,
+                            maxLines = 1,
+                            overflow = TextOverflow.Ellipsis,
+                            modifier = Modifier.weight(1f)
+                        )
+                        Text(
+                            text = "${timeFormat.format(Date(pass.startTime))} - ${timeFormat.format(Date(pass.endTime))}",
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                    Spacer(Modifier.height(4.dp))
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.SpaceBetween
+                    ) {
+                        Text(
+                            text = stringResource(R.string.mutual_elevation_you, pass.maxElevationA.toInt()),
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.primary
+                        )
+                        Text(
+                            text = stringResource(R.string.mutual_elevation_opposite, pass.maxElevationB.toInt()),
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.tertiary
+                        )
+                    }
+                }
+                // Radar shortcut, visible even on the collapsed card: a taller
+                // button spanning both header rows. The card's own click
+                // (expand) is not triggered by the IconButton's tap.
+                IconButton(
+                    onClick = onNavigateToRadar,
+                    modifier = Modifier.size(48.dp)
+                ) {
+                    Icon(
+                        painter = painterResource(id = R.drawable.ic_radar),
+                        contentDescription = stringResource(R.string.mutual_open_radar),
+                        modifier = Modifier.size(24.dp)
+                    )
+                }
             }
 
             AnimatedVisibility(
@@ -622,6 +654,7 @@ private fun MutualPassCard(
                             startTime = visibleStart,
                             endTime = visibleEnd,
                             maxElev = adjustedMaxElev,
+                            isUtc = isUtc,
                             progress = dragProgress,
                             onProgressChange = { dragProgress = it }
                         )

feature/mutual/src/main/java/com/rtbishop/look4sat/feature/mutual/MutualViewModel.kt

@@ -33,6 +33,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -53,6 +54,7 @@ data class MutualUiState(
     val isCalculating: Boolean = false,
     val hasSearched: Boolean = false,
     val selectedPassIndex: Int = -1,
+    val isUtc: Boolean = false,
     val errorMessage: String? = null
 )
 
@@ -77,8 +79,15 @@ class MutualViewModel(
             stationALat = "%.4f".format(pos.latitude),
             stationALon = "%.4f".format(pos.longitude),
             stationAMinElev = 0.0,
-            stationBMinElev = 0.0
+            stationBMinElev = 0.0,
+            isUtc = settingsRepo.otherSettings.value.stateOfUtc
         ) }
+        // Keep the time display in sync with the UTC toggle in Settings
+        viewModelScope.launch {
+            settingsRepo.otherSettings.collectLatest { settings ->
+                _uiState.update { it.copy(isUtc = settings.stateOfUtc) }
+            }
+        }
     }
 
     fun onStationALat(value: String) {

feature/mutual/src/test/java/com/rtbishop/look4sat/feature/mutual/Fakes.kt

@@ -2,11 +2,14 @@ package com.rtbishop.look4sat.feature.mutual
 
 import com.rtbishop.look4sat.core.domain.model.DataSourcesSettings
 import com.rtbishop.look4sat.core.domain.model.DatabaseState
+import com.rtbishop.look4sat.core.domain.model.GridQso
+import com.rtbishop.look4sat.core.domain.model.LoTWSettings
 import com.rtbishop.look4sat.core.domain.model.OtherSettings
 import com.rtbishop.look4sat.core.domain.model.PassesSettings
 import com.rtbishop.look4sat.core.domain.model.RCSettings
 import com.rtbishop.look4sat.core.domain.model.RadioControlSettings
 import com.rtbishop.look4sat.core.domain.model.SatRadio
+import com.rtbishop.look4sat.core.domain.model.WavelogSettings
 import com.rtbishop.look4sat.core.domain.predict.GeoPos
 import com.rtbishop.look4sat.core.domain.predict.OrbitalObject
 import com.rtbishop.look4sat.core.domain.predict.OrbitalPass
@@ -62,7 +65,17 @@ class FakeSettingsRepo(initialPosition: GeoPos = GeoPos(23.13, 113.26)) : ISetti
         RCSettings(false, "", "", "", false, "", "", "", 0L, false, "", "", "", false, "", "")
     )
     override val otherSettings: StateFlow<OtherSettings> = MutableStateFlow(
-        OtherSettings(false, false, false, false, false, false, false, false)
+        OtherSettings(
+            stateOfAutoUpdate = false,
+            stateOfSensors = false,
+            stateOfSweep = false,
+            stateOfUtc = false,
+            stateOfLightTheme = false,
+            stateOfNightMode = false,
+            stateOfMapGrid = false,
+            shouldSeeWarning = false,
+            shouldSeeWhatsNew = false
+        )
     )
     override val dataSourcesSettings: StateFlow<DataSourcesSettings> = MutableStateFlow(
         DataSourcesSettings(satelliteUrls = emptyList(), transceiversUrls = emptyList())
@@ -70,6 +83,8 @@ class FakeSettingsRepo(initialPosition: GeoPos = GeoPos(23.13, 113.26)) : ISetti
     override val radioControlSettings: StateFlow<RadioControlSettings> = MutableStateFlow(
         RadioControlSettings(false, RadioControlSettings.MODEL_YAESU_FT817, "", "", "", "", 9600)
     )
+    override val wavelogSettings: StateFlow<WavelogSettings> = MutableStateFlow(WavelogSettings())
+    override val lotwSettings: StateFlow<LoTWSettings> = MutableStateFlow(LoTWSettings())
 
     override fun setSelectedIds(ids: List<Int>) = TODO()
     override fun setSelectedTypes(types: List<String>) = TODO()
@@ -93,4 +108,16 @@ class FakeSettingsRepo(initialPosition: GeoPos = GeoPos(23.13, 113.26)) : ISetti
     override fun setSatelliteOffset(catnum: Int, offset: String) = TODO()
     override fun getAmSatCallsign(): String = ""
     override fun setAmSatCallsign(callsign: String) = TODO()
+    override fun updateWavelogSettings(settings: WavelogSettings) = TODO()
+    override fun getWorkedGrids(): Set<String> = TODO()
+    override fun setWorkedGrids(grids: Set<String>) = TODO()
+    override fun getWorkedGridQsos(): Map<String, List<GridQso>> = TODO()
+    override fun setWorkedGridQsos(qsos: Map<String, List<GridQso>>) = TODO()
+    override fun getRoamedGrids(): Set<String> = TODO()
+    override fun setRoamedGrids(grids: Set<String>) = TODO()
+    override fun updateLoTWSettings(settings: LoTWSettings) = TODO()
+    override fun getLastLotwSyncDate(): String = ""
+    override fun setLastLotwSyncDate(date: String) = Unit
+    override fun getLastLotwSyncCallsign(): String = ""
+    override fun setLastLotwSyncCallsign(callsign: String) = Unit
 }

feature/radar/src/main/java/com/rtbishop/look4sat/feature/radar/RadarScreen.kt

@@ -101,14 +101,17 @@ fun RadarDestination(navigateUp: () -> Unit) {
     }
     LaunchedEffect(mutualData.endTime) {
         if (mutualData.endTime <= 0L) return@LaunchedEffect
-        while (true) {
-            val remainingMs = mutualData.endTime - System.currentTimeMillis()
-            if (remainingMs <= 0L) {
-                navigateUpAndClearMutual()
-                return@LaunchedEffect
-            }
+        // Auto-return only while the mutual pass is actually in progress. An
+        // already-finished pass must NOT bounce the radar page back instantly
+        // (that made the pass-card radar shortcut look broken: tapping it while
+        // the computed pass had ended returned to Mutual immediately).
+        var remainingMs = mutualData.endTime - System.currentTimeMillis()
+        if (remainingMs <= 0L) return@LaunchedEffect
+        while (remainingMs > 0L) {
             delay(remainingMs.coerceAtMost(1000L))
+            remainingMs = mutualData.endTime - System.currentTimeMillis()
         }
+        navigateUpAndClearMutual()
     }
     // Sync actual permission state on every recomposition so it survives screen re-entry
     val hasPermission = ContextCompat.checkSelfPermission(

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsDialog.kt

@@ -50,6 +50,7 @@ import androidx.compose.material3.Checkbox
 import androidx.compose.material3.FilterChip
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.LinearProgressIndicator
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.TextButton
 import androidx.compose.material3.OutlinedTextField
@@ -86,6 +87,7 @@ import androidx.compose.ui.zIndex
 import com.rtbishop.look4sat.core.domain.model.Constants
 import com.rtbishop.look4sat.core.domain.model.RCSettings
 import com.rtbishop.look4sat.core.domain.model.RadioControlSettings
+import com.rtbishop.look4sat.core.domain.repository.LoTWSyncMode
 import com.rtbishop.look4sat.core.domain.source.NetworkResult
 import com.rtbishop.look4sat.core.domain.source.Sources
 import com.rtbishop.look4sat.core.presentation.CardButton
@@ -228,23 +230,27 @@ fun LoTWDialog(
     initialSettings: com.rtbishop.look4sat.core.domain.model.LoTWSettings,
     workedGridsCount: Int,
     isSyncing: Boolean,
+    syncMode: LoTWSyncMode?,
+    progress: com.rtbishop.look4sat.core.domain.repository.LoTWProgress?,
     message: String?,
     dismiss: () -> Unit,
+    /** Called on cancel/back while a sync is running: aborts the job. */
+    onCancelSync: () -> Unit,
     onSave: (com.rtbishop.look4sat.core.domain.model.LoTWSettings) -> Unit,
-    onSync: (com.rtbishop.look4sat.core.domain.model.LoTWSettings) -> Unit
+    onSyncFull: (com.rtbishop.look4sat.core.domain.model.LoTWSettings) -> Unit,
+    onSyncIncremental: (com.rtbishop.look4sat.core.domain.model.LoTWSettings) -> Unit
 ) {
     val call = rememberSaveable { mutableStateOf(initialSettings.callsign) }
     val pass = rememberSaveable { mutableStateOf(initialSettings.password) }
     SharedDialog(
         title = stringResource(R.string.prefs_lotw_title),
-        onCancel = dismiss,
-        // The confirm button IS the sync action: saving credentials and
-        // fetching confirmed grids happen in one step.
-        onAccept = {
-            onSync(com.rtbishop.look4sat.core.domain.model.LoTWSettings(call.value, pass.value))
-        },
-        acceptText = stringResource(if (isSyncing) R.string.prefs_lotw_syncing else R.string.prefs_lotw_sync),
-        acceptEnabled = !isSyncing
+        // While syncing, cancel/back aborts the download instead of merely
+        // hiding the dialog — a full sync started by mistake must be stoppable.
+        onDismissRequest = { if (isSyncing) onCancelSync() else dismiss() },
+        onCancel = { if (isSyncing) onCancelSync() else dismiss() },
+        // The two sync buttons below are the primary actions: saving
+        // credentials and fetching confirmed grids happen in one step.
+        onAccept = null
     ) {
         OutlinedTextField(
             value = call.value,
@@ -268,12 +274,50 @@ fun LoTWDialog(
             style = MaterialTheme.typography.bodySmall,
             modifier = Modifier.padding(horizontal = LocalSpacing.current.large)
         )
-        Text(
-            text = stringResource(R.string.prefs_lotw_sync_duration_hint),
-            style = MaterialTheme.typography.bodySmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant,
-            modifier = Modifier.padding(horizontal = LocalSpacing.current.large)
-        )
+        if (isSyncing) {
+            // Live progress: once the report header reveals the record count,
+            // switch to "N QSOs, ~X s remaining" with a determinate bar.
+            val progressText = when {
+                progress == null ||
+                    progress.phase == com.rtbishop.look4sat.core.domain.repository.LoTWPhase.Connecting ->
+                    stringResource(R.string.lotw_sync_progress_connecting)
+                // Download finished (or the size estimate reached its cap):
+                // parsing and saving may still run — say so instead of the bar
+                // sitting at 100% with no feedback, which reads as "stuck".
+                progress.fraction >= 1f ->
+                    stringResource(R.string.lotw_sync_progress_saving)
+                progress.qsoCount > 0 && progress.remainingSeconds > 0 ->
+                    stringResource(R.string.lotw_sync_progress_qso, progress.qsoCount, progress.remainingSeconds)
+                progress.qsoCount > 0 ->
+                    stringResource(R.string.lotw_sync_progress_count, progress.qsoCount)
+                else -> stringResource(R.string.lotw_sync_progress_downloading)
+            }
+            Text(
+                text = progressText,
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.padding(horizontal = LocalSpacing.current.large)
+            )
+            if (progress != null && progress.expectedBytes > 0) {
+                LinearProgressIndicator(
+                    progress = { progress.fraction },
+                    modifier = Modifier.fillMaxWidth().padding(horizontal = LocalSpacing.current.large)
+                )
+            } else {
+                LinearProgressIndicator(
+                    modifier = Modifier.fillMaxWidth().padding(horizontal = LocalSpacing.current.large)
+                )
+            }
+        } else {
+            // Pre-sync estimate: rate per 100 QSOs (measured ~8 s at ARRL's
+            // ~10 KB/s stream rate), plus the fixed server-side generation time.
+            Text(
+                text = stringResource(R.string.lotw_sync_rate_hint),
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.padding(horizontal = LocalSpacing.current.large)
+            )
+        }
         if (message != null) {
             Text(
                 text = message,
@@ -282,6 +326,22 @@ fun LoTWDialog(
                 modifier = Modifier.padding(horizontal = LocalSpacing.current.large)
             )
         }
+        Row(
+            horizontalArrangement = Arrangement.SpaceBetween,
+            modifier = Modifier.fillMaxWidth().padding(horizontal = LocalSpacing.current.large)
+        ) {
+            // Full sync bottom-left, incremental merge bottom-right.
+            CardButton(
+                onClick = { onSyncFull(com.rtbishop.look4sat.core.domain.model.LoTWSettings(call.value, pass.value)) },
+                text = stringResource(R.string.lotw_sync_full),
+                isEnabled = !isSyncing
+            )
+            CardButton(
+                onClick = { onSyncIncremental(com.rtbishop.look4sat.core.domain.model.LoTWSettings(call.value, pass.value)) },
+                text = stringResource(R.string.lotw_sync_incremental),
+                isEnabled = !isSyncing
+            )
+        }
         Spacer(modifier = Modifier.height(0.dp))
     }
 }

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsScreen.kt

@@ -67,6 +67,7 @@ import com.rtbishop.look4sat.core.domain.model.RadioControlSettings
 import com.rtbishop.look4sat.core.domain.model.WavelogSettings
 import com.rtbishop.look4sat.core.domain.predict.GeoPos
 import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
+import com.rtbishop.look4sat.core.domain.repository.LoTWSyncMode
 import com.rtbishop.look4sat.core.presentation.CardButton
 import com.rtbishop.look4sat.core.presentation.IconCard
 import com.rtbishop.look4sat.core.presentation.MainTheme
@@ -204,14 +205,29 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
         )
     }
     if (dialogs.lotw) {
+        // LoTW sync failures are typed codes from the ViewModel; render them
+        // through string resources so the dialog follows the system language.
+        val lotwErrorMessage = uiState.lotwError?.let { error ->
+            when (error) {
+                LoTWError.NotConfigured -> stringResource(R.string.lotw_sync_error_not_configured)
+                LoTWError.BadCredentials -> stringResource(R.string.lotw_sync_error_credentials)
+                LoTWError.RateLimited -> stringResource(R.string.lotw_sync_error_rate_limited)
+                LoTWError.Timeout -> stringResource(R.string.lotw_sync_error_timeout)
+                is LoTWError.Network -> stringResource(R.string.lotw_sync_error_network, error.detail)
+            }
+        }
         LoTWDialog(
             initialSettings = uiState.lotwSettings,
             workedGridsCount = uiState.workedGridsCount,
             isSyncing = uiState.lotwSyncing,
-            message = uiState.lotwMessage,
+            syncMode = uiState.lotwSyncMode,
+            progress = uiState.lotwProgress,
+            message = lotwErrorMessage,
             dismiss = { dialogs.lotw = false },
+            onCancelSync = { onAction(SettingsAction.CancelLoTWSync); dialogs.lotw = false },
             onSave = { onAction(SettingsAction.UpdateLoTW(it)) },
-            onSync = { onAction(SettingsAction.SyncLoTWGrids(it)) }
+            onSyncFull = { onAction(SettingsAction.SyncLoTWGrids(it, LoTWSyncMode.Full)) },
+            onSyncIncremental = { onAction(SettingsAction.SyncLoTWGrids(it, LoTWSyncMode.Incremental)) }
         )
     }
 
@@ -322,6 +338,7 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
                 LoTWCard(
                     settings = uiState.lotwSettings,
                     workedGridsCount = uiState.workedGridsCount,
+                    lastSyncEpochMs = uiState.lotwLastSyncEpochMs,
                     showLoTWDialog = { dialogs.lotw = true }
                 )
             }
@@ -521,7 +538,7 @@ private fun OtherCard(settings: OtherSettings, onAction: (SettingsAction) -> Uni
     ElevatedCard(
         modifier = Modifier
             .fillMaxWidth()
-            .height(312.dp)
+            .height(320.dp)
     ) {
         Column(modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp)) {
             Text(
@@ -534,6 +551,9 @@ private fun OtherCard(settings: OtherSettings, onAction: (SettingsAction) -> Uni
             SwitchRow(R.string.prefs_other_switch_update, settings.stateOfAutoUpdate) {
                 onAction(SettingsAction.ToggleUpdate(it))
             }
+            SwitchRow(R.string.prefs_other_switch_lotw_sync, settings.stateOfAutoLotwSync) {
+                onAction(SettingsAction.ToggleAutoLotwSync(it))
+            }
             SwitchRow(R.string.prefs_other_switch_sweep, settings.stateOfSweep) {
                 onAction(SettingsAction.ToggleSweep(it))
             }
@@ -543,9 +563,6 @@ private fun OtherCard(settings: OtherSettings, onAction: (SettingsAction) -> Uni
             SwitchRow(R.string.prefs_other_switch_night_mode, settings.stateOfNightMode) {
                 onAction(SettingsAction.ToggleNightMode(it))
             }
-            SwitchRow(R.string.prefs_other_switch_map_grid, settings.stateOfMapGrid) {
-                onAction(SettingsAction.ToggleMapGrid(it))
-            }
         }
     }
 }
@@ -566,6 +583,7 @@ private fun SwitchRow(labelResId: Int, checked: Boolean, onCheckedChange: (Boole
 private fun LoTWCard(
     settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings,
     workedGridsCount: Int,
+    lastSyncEpochMs: Long,
     showLoTWDialog: () -> Unit
 ) {
     ElevatedCard(modifier = Modifier.fillMaxWidth()) {
@@ -584,6 +602,14 @@ private fun LoTWCard(
                 style = MaterialTheme.typography.bodySmall,
                 maxLines = 2
             )
+            // Last successful sync, shown exactly like the ephemeris update time.
+            if (lastSyncEpochMs != 0L) {
+                Spacer(modifier = Modifier.height(2.dp))
+                Text(
+                    text = formatUpdateTime(updateTime = lastSyncEpochMs),
+                    style = MaterialTheme.typography.bodySmall
+                )
+            }
             Spacer(modifier = Modifier.height(4.dp))
             CardButton(
                 onClick = showLoTWDialog,

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsState.kt

@@ -24,6 +24,7 @@ import com.rtbishop.look4sat.core.domain.model.RCSettings
 import com.rtbishop.look4sat.core.domain.model.RadioControlSettings
 import com.rtbishop.look4sat.core.domain.model.WavelogSettings
 import com.rtbishop.look4sat.core.domain.predict.GeoPos
+import com.rtbishop.look4sat.core.domain.repository.LoTWSyncMode
 import java.io.File
 
 data class PositionSettings(
@@ -61,10 +62,23 @@ data class SettingsState(
     val wavelogMessage: String? = null,
     val lotwSettings: com.rtbishop.look4sat.core.domain.model.LoTWSettings = com.rtbishop.look4sat.core.domain.model.LoTWSettings(),
     val lotwSyncing: Boolean = false,
-    val lotwMessage: String? = null,
+    val lotwSyncMode: LoTWSyncMode? = null,
+    val lotwProgress: com.rtbishop.look4sat.core.domain.repository.LoTWProgress? = null,
+    val lotwError: LoTWError? = null,
+    /** Epoch ms of the last successful LoTW sync (0 = never) — shown like the ephemeris update time. */
+    val lotwLastSyncEpochMs: Long = 0L,
     val updateChecker: UpdateCheckerState = UpdateCheckerState()
 )
 
+/** LoTW sync failure, kept as a translatable code until the UI renders it. */
+sealed interface LoTWError {
+    data object NotConfigured : LoTWError
+    data object BadCredentials : LoTWError
+    data object RateLimited : LoTWError
+    data object Timeout : LoTWError
+    data class Network(val detail: String) : LoTWError
+}
+
 sealed interface SettingsAction {
     // Position
     data object SetGpsPosition : SettingsAction
@@ -81,11 +95,11 @@ sealed interface SettingsAction {
     // Toggles
     data class ToggleUtc(val value: Boolean) : SettingsAction
     data class ToggleUpdate(val value: Boolean) : SettingsAction
+    data class ToggleAutoLotwSync(val value: Boolean) : SettingsAction
     data class ToggleSweep(val value: Boolean) : SettingsAction
     data class ToggleSensor(val value: Boolean) : SettingsAction
     data class ToggleLightTheme(val value: Boolean) : SettingsAction
     data class ToggleNightMode(val value: Boolean) : SettingsAction
-    data class ToggleMapGrid(val value: Boolean) : SettingsAction
 
     // Remote control
     data class UpdateRC(val settings: RCSettings) : SettingsAction
@@ -100,7 +114,12 @@ sealed interface SettingsAction {
 
     // LoTW confirmed grids
     data class UpdateLoTW(val settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings) : SettingsAction
-    data class SyncLoTWGrids(val settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings) : SettingsAction
+    data class SyncLoTWGrids(
+        val settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings,
+        val mode: LoTWSyncMode
+    ) : SettingsAction
+    /** Abort an in-flight LoTW sync (wrong button / changed mind). */
+    data object CancelLoTWSync : SettingsAction
 
     // Update checker
     data object CheckForUpdate : SettingsAction

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsViewModel.kt

@@ -27,6 +27,12 @@ import com.rtbishop.look4sat.core.domain.model.WavelogSettings
 import com.rtbishop.look4sat.core.domain.repository.IMainContainer
 import com.rtbishop.look4sat.core.domain.repository.ISettingsRepo
 import com.rtbishop.look4sat.core.domain.repository.IUpdateRepository
+import com.rtbishop.look4sat.core.domain.repository.LoTWResult
+import com.rtbishop.look4sat.core.domain.repository.LoTWSyncMode
+import com.rtbishop.look4sat.core.domain.repository.applyLoTWGridResult
+import com.rtbishop.look4sat.core.domain.repository.lotwCursorApi
+import com.rtbishop.look4sat.core.domain.repository.lotwCursorEpochMs
+import com.rtbishop.look4sat.core.domain.repository.resolveLoTWSyncMode
 import com.rtbishop.look4sat.core.domain.repository.IWavelogRepository
 import com.rtbishop.look4sat.core.domain.usecase.IShowToast
 import com.rtbishop.look4sat.core.domain.utility.VersionComparator
@@ -49,6 +55,8 @@ class SettingsViewModel(
 
     private val defaultPosSettings = PositionSettings(false, settingsRepo.stationPosition.value, 0)
     private val defaultDataSettings = DataSettings(false, 0, 0, 0L)
+    /** In-flight LoTW sync job, cancelled by CancelLoTWSync. */
+    private var lotwSyncJob: kotlinx.coroutines.Job? = null
     private val _uiState = MutableStateFlow(
         SettingsState(
             appVersionName = settingsRepo.appVersionName,
@@ -60,7 +68,8 @@ class SettingsViewModel(
             dataSourcesSettings = settingsRepo.dataSourcesSettings.value,
             dataSourcesStatus = settingsRepo.dataSourcesStatus.value,
             wavelogSettings = settingsRepo.wavelogSettings.value,
-            workedGridsCount = settingsRepo.getWorkedGrids().size
+            workedGridsCount = settingsRepo.getWorkedGrids().size,
+            lotwLastSyncEpochMs = lotwCursorEpochMs(settingsRepo.getLastLotwSyncDate())
         )
     )
 
@@ -145,11 +154,11 @@ class SettingsViewModel(
             // Toggles
             is SettingsAction.ToggleUtc -> settingsRepo.updateOtherSettings { it.copy(stateOfUtc = action.value) }
             is SettingsAction.ToggleUpdate -> settingsRepo.updateOtherSettings { it.copy(stateOfAutoUpdate = action.value) }
+            is SettingsAction.ToggleAutoLotwSync -> settingsRepo.updateOtherSettings { it.copy(stateOfAutoLotwSync = action.value) }
             is SettingsAction.ToggleSweep -> settingsRepo.updateOtherSettings { it.copy(stateOfSweep = action.value) }
             is SettingsAction.ToggleSensor -> settingsRepo.updateOtherSettings { it.copy(stateOfSensors = action.value) }
             is SettingsAction.ToggleLightTheme -> settingsRepo.updateOtherSettings { it.copy(stateOfLightTheme = action.value) }
             is SettingsAction.ToggleNightMode -> settingsRepo.updateOtherSettings { it.copy(stateOfNightMode = action.value) }
-            is SettingsAction.ToggleMapGrid -> settingsRepo.updateOtherSettings { it.copy(stateOfMapGrid = action.value) }
             // Remote control & data sources
             is SettingsAction.UpdateRC -> settingsRepo.updateRCSettings(action.settings)
             is SettingsAction.UpdateRadioControl -> settingsRepo.updateRadioControlSettings(action.settings)
@@ -159,7 +168,8 @@ class SettingsViewModel(
             is SettingsAction.SyncWorkedGrids -> syncWorkedGrids(action.settings)
             // LoTW confirmed grids
             is SettingsAction.UpdateLoTW -> settingsRepo.updateLoTWSettings(action.settings)
-            is SettingsAction.SyncLoTWGrids -> syncLoTWGrids(action.settings)
+            is SettingsAction.SyncLoTWGrids -> syncLoTWGrids(action.settings, action.mode)
+            SettingsAction.CancelLoTWSync -> cancelLoTWSync()
             // Update checker
             SettingsAction.CheckForUpdate -> checkForUpdate()
             SettingsAction.DownloadUpdate -> downloadUpdate()
@@ -192,61 +202,84 @@ class SettingsViewModel(
         }
     }
 
-    private fun syncLoTWGrids(settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings) {
+    private fun syncLoTWGrids(
+        settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings,
+        mode: LoTWSyncMode
+    ) {
         if (!settings.isConfigured) {
-            _uiState.update { it.copy(lotwMessage = "LoTW callsign/password not configured") }
+            _uiState.update { it.copy(lotwError = LoTWError.NotConfigured) }
             return
         }
         // Persist the credentials first, then sync with the freshly-typed values.
         settingsRepo.updateLoTWSettings(settings)
-        _uiState.update { it.copy(lotwSyncing = true, lotwMessage = null) }
-        viewModelScope.launch {
-            when (val result = lotwRepo.fetchConfirmedGridQsos(settings.callsign, settings.password)) {
-                is com.rtbishop.look4sat.core.domain.repository.LoTWResult.Success -> {
-                    // Wavelog entry removed: LoTW is now the only source, so the
-                    // synced set fully replaces the stored worked grids.
-                    settingsRepo.setWorkedGrids(result.grids)
-                    settingsRepo.setWorkedGridQsos(result.qsos)
-                    settingsRepo.setRoamedGrids(result.roamedGrids)
+        // Incremental only makes sense for the same callsign as the last sync;
+        // a first sync, an unknown/empty record or a callsign change must fall
+        // back to a full report so no stale grids from another account linger.
+        val callsign = settings.callsign.trim().uppercase()
+        val effectiveMode = resolveLoTWSyncMode(settingsRepo.getLastLotwSyncCallsign(), callsign, mode)
+        val since = if (effectiveMode == LoTWSyncMode.Incremental) {
+            lotwCursorApi(settingsRepo.getLastLotwSyncDate())
+        } else ""
+        _uiState.update {
+            it.copy(lotwSyncing = true, lotwSyncMode = effectiveMode, lotwProgress = null, lotwError = null)
+        }
+        lotwSyncJob = viewModelScope.launch {
+            val result = lotwRepo.fetchConfirmedGridQsos(callsign, settings.password, since) { progress ->
+                _uiState.update { it.copy(lotwProgress = progress) }
+            }
+            when (result) {
+                is LoTWResult.Success -> {
+                    // Incremental: merge new grids/QSOs into the stored set (dedup
+                    // by call + QSO time); full: the fresh report replaces it all.
+                    // Shared with the automatic sync on app start (MainApplication).
+                    val mergedGridsCount = applyLoTWGridResult(settingsRepo, result, effectiveMode, callsign)
                     _uiState.update { state ->
                         state.copy(
-                            lotwSyncing = false, workedGridsCount = result.grids.size,
-                            lotwMessage = null
+                            lotwSyncing = false, lotwSyncMode = null, lotwProgress = null,
+                            workedGridsCount = mergedGridsCount, lotwError = null,
+                            lotwLastSyncEpochMs = lotwCursorEpochMs(settingsRepo.getLastLotwSyncDate())
                         )
                     }
                 }
-                is com.rtbishop.look4sat.core.domain.repository.LoTWResult.BadCredentials ->
+                is LoTWResult.BadCredentials ->
                     _uiState.update { state ->
                         state.copy(
-                            lotwSyncing = false,
-                            lotwMessage = "LoTW sync failed — callsign or password incorrect"
+                            lotwSyncing = false, lotwSyncMode = null, lotwProgress = null,
+                            lotwError = LoTWError.BadCredentials
                         )
                     }
-                is com.rtbishop.look4sat.core.domain.repository.LoTWResult.RateLimited ->
+                is LoTWResult.RateLimited ->
                     _uiState.update { state ->
                         state.copy(
-                            lotwSyncing = false,
-                            lotwMessage = "LoTW sync failed — rate limited by server, wait a few minutes and retry"
+                            lotwSyncing = false, lotwSyncMode = null, lotwProgress = null,
+                            lotwError = LoTWError.RateLimited
                         )
                     }
-                is com.rtbishop.look4sat.core.domain.repository.LoTWResult.Timeout ->
+                is LoTWResult.Timeout ->
                     _uiState.update { state ->
                         state.copy(
-                            lotwSyncing = false,
-                            lotwMessage = "LoTW sync failed — connection timed out, try another network"
+                            lotwSyncing = false, lotwSyncMode = null, lotwProgress = null,
+                            lotwError = LoTWError.Timeout
                         )
                     }
-                is com.rtbishop.look4sat.core.domain.repository.LoTWResult.NetworkError ->
+                is LoTWResult.NetworkError ->
                     _uiState.update { state ->
                         state.copy(
-                            lotwSyncing = false,
-                            lotwMessage = "LoTW sync failed — network error (${result.detail})"
+                            lotwSyncing = false, lotwSyncMode = null, lotwProgress = null,
+                            lotwError = LoTWError.Network(result.detail)
                         )
                     }
             }
         }
     }
 
+    /** Abort the in-flight LoTW sync job and reset its progress state. */
+    private fun cancelLoTWSync() {
+        lotwSyncJob?.cancel()
+        lotwSyncJob = null
+        _uiState.update { it.copy(lotwSyncing = false, lotwSyncMode = null, lotwProgress = null) }
+    }
+
     // endregion
 
     // region Update checker

feature/status/src/main/java/com/rtbishop/look4sat/feature/status/SatStatusScreen.kt

@@ -58,7 +58,6 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.rtbishop.look4sat.core.domain.model.SatDay
 import com.rtbishop.look4sat.core.domain.model.SatReport
-import com.rtbishop.look4sat.core.domain.model.SatSlot
 import com.rtbishop.look4sat.core.domain.model.SatStatus
 import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
 import com.rtbishop.look4sat.core.presentation.CardButton
@@ -316,7 +315,6 @@ private fun HeaderRow(statuses: List<SatStatus>) {
 /** Satellite row: name takes remaining width; day tiles are fixed-width (tablet-safe). */
 @Composable
 private fun StatusRow(status: SatStatus, onClickDay: (SatDay) -> Unit) {
-    val noReportGray = 0xFFC0C0C0L
     Row(
         modifier = Modifier.fillMaxWidth().padding(vertical = 2.dp),
         verticalAlignment = Alignment.CenterVertically
@@ -329,9 +327,8 @@ private fun StatusRow(status: SatStatus, onClickDay: (SatDay) -> Unit) {
             modifier = Modifier.weight(1f).padding(end = 4.dp)
         )
         status.days.forEach { day ->
-            val slot = day.slots.firstOrNull { it.statusColor != noReportGray } ?: day.slots.first()
             DayCell(
-                slot = slot,
+                day = day,
                 modifier = Modifier.width(TILE_WIDTH).padding(horizontal = 2.dp),
                 onClick = { onClickDay(day) }
             )
@@ -339,10 +336,17 @@ private fun StatusRow(status: SatStatus, onClickDay: (SatDay) -> Unit) {
     }
 }
 
-/** Day block: newest reported status among the day's 12 slots; gray when none. */
+/**
+ * Day block: colored by the newest reported status among the day's 12 slots
+ * (gray when none); the number is the TOTAL report count of the whole day
+ * (sum over all slots), not the count of the newest slot alone.
+ */
 @Composable
-private fun DayCell(slot: SatSlot, modifier: Modifier, onClick: () -> Unit) {
+private fun DayCell(day: SatDay, modifier: Modifier, onClick: () -> Unit) {
+    val noReportGray = 0xFFC0C0C0L
+    val slot = day.slots.firstOrNull { it.statusColor != noReportGray } ?: day.slots.first()
     val color = Color(slot.statusColor)
+    val totalCount = day.slots.sumOf { it.count }
     Box(
         modifier = modifier
             .height(28.dp)
@@ -351,8 +355,8 @@ private fun DayCell(slot: SatSlot, modifier: Modifier, onClick: () -> Unit) {
             .clickable(onClick = onClick),
         contentAlignment = Alignment.Center
     ) {
-        if (slot.count > 0) {
-            Text(text = slot.count.toString(), fontSize = 13.sp, fontWeight = FontWeight.Bold, color = Color.White)
+        if (totalCount > 0) {
+            Text(text = totalCount.toString(), fontSize = 13.sp, fontWeight = FontWeight.Bold, color = Color.White)
         }
     }
 }

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 #noinspection UnusedVersionCatalogEntry
-appVersionCode = "470"
+appVersionCode = "478"
 #noinspection UnusedVersionCatalogEntry
-appVersionName = "4.4.7-ba7opf.0"
+appVersionName = "4.4.7-ba7opf.8"
 #noinspection UnusedVersionCatalogEntry
 compileSdk = "37"
 #noinspection UnusedVersionCatalogEntry