chore: bump version to 4.4.6-ba7opf.9.7

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

@@ -57,15 +57,25 @@ class LoTWRepository : ILoTWRepository {
             }
             try {
                 val connection = URL("$BASE_URL?$query").openConnection() as HttpURLConnection
-                connection.connectTimeout = 15_000
-                connection.readTimeout = 60_000
+                // 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
                 connection.requestMethod = "GET"
+                connection.setRequestProperty("Accept-Encoding", "gzip")
+                connection.instanceFollowRedirects = true
                 val code = connection.responseCode
                 if (code !in 200..299) {
                     connection.disconnect()
                     return@withContext null
                 }
-                val body = connection.inputStream.bufferedReader().use { it.readText() }
+                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() }
                 connection.disconnect()
                 if (body.contains(" password=") && !body.startsWith("ARRL")) return@withContext null
                 parseConfirmedGrids(body)

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

@@ -58,6 +58,14 @@ class UpdateRepository(
         val title = Regex("<title>(.*?)</title>", RegexOption.DOT_MATCHES_ALL)
             .find(html)?.groupValues?.get(1)?.trim()
             ?.substringBefore("·")?.removePrefix("Release")?.trim() ?: tag
+        // Release notes live in the page's markdown-body section (first occurrence
+        // is the release description). Strip HTML tags for plain-text display.
+        val raw = Regex("<div[^>]*class=\"[^\"]*markdown-body[^\"]*\"[^>]*>(.*?)</div>", RegexOption.DOT_MATCHES_ALL)
+            .find(html)?.groupValues?.get(1) ?: ""
+        val body = raw.replace(Regex("<[^>]+>"), "")
+            .replace("&lt;", "<").replace("&gt;", ">").replace("&amp;", "&")
+            .replace("&quot;", "\"").replace("&#39;", "'")
+            .trim()
         // The release APK asset follows the fixed naming scheme used by the build:
         // Look4Sat-<tag without leading v>-release.apk. When the page was fetched
         // through an accelerator mirror (https://<mirror>/https://github.com/...),
@@ -72,7 +80,7 @@ class UpdateRepository(
         return LatestRelease(
             versionTag = tag,
             title = title,
-            body = "",
+            body = body,
             apkUrl = apkUrl
         )
     }

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

@@ -210,12 +210,20 @@ fun RowScope.NextPassRow(pass: OrbitalPass, modifier: Modifier = Modifier, isUtc
 }
 
 @Composable
-fun CardButton(onClick: () -> Unit, text: String, modifier: Modifier = Modifier) {
+fun CardButton(
+    onClick: () -> Unit,
+    text: String,
+    modifier: Modifier = Modifier,
+    isEnabled: Boolean = true
+) {
     ElevatedButton(
         onClick = onClick,
+        enabled = isEnabled,
         colors = ButtonDefaults.buttonColors(
             containerColor = MaterialTheme.colorScheme.surfaceVariant,
-            contentColor = MaterialTheme.colorScheme.onSurfaceVariant
+            contentColor = MaterialTheme.colorScheme.onSurfaceVariant,
+            disabledContainerColor = MaterialTheme.colorScheme.surfaceVariant,
+            disabledContentColor = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.4f)
         ),
         shape = MaterialTheme.shapes.small,
         modifier = modifier,
@@ -316,9 +324,21 @@ fun InfoDialog(
 
 @Composable
 fun SharedDialog(
-    title: String, onCancel: () -> Unit, onAccept: () -> Unit, content: @Composable () -> Unit
+    title: String,
+    onCancel: () -> Unit,
+    onAccept: () -> Unit,
+    acceptText: String? = null,
+    acceptEnabled: Boolean = true,
+    content: @Composable () -> Unit
 ) {
-    SharedDialog(title = title, onDismissRequest = onCancel, onCancel = onCancel, onAccept = onAccept) { _ ->
+    SharedDialog(
+        title = title,
+        onDismissRequest = onCancel,
+        onCancel = onCancel,
+        onAccept = onAccept,
+        acceptText = acceptText,
+        acceptEnabled = acceptEnabled
+    ) { _ ->
         content()
     }
 }
@@ -329,6 +349,8 @@ fun SharedDialog(
     onDismissRequest: () -> Unit,
     onCancel: (() -> Unit)? = null,
     onAccept: (() -> Unit)? = null,
+    acceptText: String? = null,
+    acceptEnabled: Boolean = true,
     titleFontSize: Int = 16,
     titleTextAlign: TextAlign = if (onCancel != null && onAccept != null) TextAlign.Center else TextAlign.Start,
     content: @Composable (padding: Dp) -> Unit
@@ -356,7 +378,11 @@ fun SharedDialog(
                     .padding(horizontal = if (onCancel != null && onAccept != null) padding else 0.dp)
             )
             if (onAccept != null) {
-                CardButton(onClick = onAccept, text = stringResource(R.string.btn_accept))
+                CardButton(
+                    onClick = onAccept,
+                    text = acceptText ?: stringResource(R.string.btn_accept),
+                    isEnabled = acceptEnabled
+                )
             }
         }
         content(padding)

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

@@ -0,0 +1,142 @@
+package com.rtbishop.look4sat.core.presentation
+
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.Path
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.graphics.drawscope.rotate
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import kotlin.math.atan2
+import kotlin.math.cos
+import kotlin.math.sin
+import kotlin.math.sqrt
+
+/**
+ * Format a Maidenhead locator for display. Per IARU convention and the user's
+ * preference: field letters (1-2) and square digits (3-4) uppercase, sub-square
+ * letters (5-6 of a 6/8-char locator) lowercase, e.g. "OL62" / "OL62kl".
+ */
+fun formatGridDisplay(grid: String): String? {
+    val g = grid.trim().uppercase()
+    if (g.length !in listOf(4, 6, 8) || g.any { !it.isLetterOrDigit() }) return null
+    if (g.length == 4) return g
+    if (g.length == 6) return g.take(4) + g.drop(4).lowercase()
+    return g.take(4) + g.drop(4).take(2).lowercase() + g.drop(6)
+}
+
+/**
+ * Top-bar chip for the mutual-match screen: navigation needle (rotated by the
+ * great-circle bearing to the target grid, 0 deg = north), grid locator and
+ * distance. Shows a dimmed placeholder when no target grid is entered.
+ */
+@Composable
+fun GridTargetChip(
+    grid: String?,
+    distanceKm: Double?,
+    bearingDeg: Double?,
+    modifier: Modifier = Modifier
+) {
+    val configured = grid != null && distanceKm != null && bearingDeg != null
+    // The app's signature accent yellow (MaterialTheme primary in both themes).
+    val accent = MaterialTheme.colorScheme.primary
+    val placeholder = MaterialTheme.colorScheme.onSurfaceVariant
+    Row(
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(8.dp),
+        modifier = modifier
+            .height(36.dp)
+            .background(
+                color = MaterialTheme.colorScheme.surface.copy(alpha = if (configured) 0.9f else 0.45f),
+                shape = RoundedCornerShape(12.dp)
+            )
+            .padding(horizontal = 12.dp)
+    ) {
+        NavigationNeedle(
+            bearingDeg = bearingDeg ?: 0.0,
+            color = if (configured) accent else placeholder,
+            dimmed = !configured,
+            modifier = Modifier.size(22.dp)
+        )
+        Text(
+            text = grid?.let { formatGridDisplay(it) } ?: "----",
+            fontSize = 15.sp,
+            fontWeight = FontWeight.Bold,
+            fontFamily = FontFamily.Monospace,
+            color = if (configured) accent else placeholder,
+            letterSpacing = 1.sp
+        )
+        Text(
+            text = distanceKm?.let { "${"%,.0f".format(it)} km" } ?: "-- km",
+            fontSize = 14.sp,
+            color = MaterialTheme.colorScheme.onSurface,
+            modifier = Modifier.padding(horizontal = 8.dp, vertical = 2.dp)
+        )
+    }
+}
+
+/**
+ * Map-style navigation needle: slim triangular pointer whose tip points at
+ * [bearingDeg] (0 = north/up, clockwise positive).
+ */
+@Composable
+private fun NavigationNeedle(
+    bearingDeg: Double,
+    color: Color,
+    dimmed: Boolean,
+    modifier: Modifier = Modifier
+) {
+    Canvas(modifier = modifier) {
+        val cx = size.width / 2f
+        val cy = size.height / 2f
+        val r = size.minDimension / 2f
+        if (dimmed) {
+            drawCircle(color = color, radius = r * 0.92f, style = Stroke(width = 1.5f))
+        }
+        rotate(degrees = bearingDeg.toFloat(), pivot = Offset(cx, cy)) {
+            val path = Path().apply {
+                moveTo(cx, cy - r * 0.9f)          // tip (north before rotation)
+                lineTo(cx - r * 0.42f, cy + r * 0.55f)
+                lineTo(cx, cy + r * 0.28f)
+                lineTo(cx + r * 0.42f, cy + r * 0.55f)
+                close()
+            }
+            drawPath(path, color = color)
+        }
+    }
+}
+
+/** Great-circle distance in km between two positions. */
+fun greatCircleDistanceKm(lat1: Double, lon1: Double, lat2: Double, lon2: Double): Double {
+    val rad = Math.PI / 180.0
+    val dLat = (lat2 - lat1) * rad
+    val dLon = (lon2 - lon1) * rad
+    val a = sin(dLat / 2) * sin(dLat / 2) +
+        cos(lat1 * rad) * cos(lat2 * rad) * sin(dLon / 2) * sin(dLon / 2)
+    return 6371.0 * 2 * kotlin.math.atan2(kotlin.math.sqrt(a), kotlin.math.sqrt(1 - a))
+}
+
+/** Initial great-circle bearing in degrees (0 = north, clockwise). */
+fun greatCircleBearingDeg(lat1: Double, lon1: Double, lat2: Double, lon2: Double): Double {
+    val rad = Math.PI / 180.0
+    val dLon = (lon2 - lon1) * rad
+    val y = sin(dLon) * cos(lat2 * rad)
+    val x = cos(lat1 * rad) * sin(lat2 * rad) -
+        sin(lat1 * rad) * cos(lat2 * rad) * cos(dLon)
+    return (Math.atan2(y, x) / rad + 360.0) % 360.0
+}

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

@@ -151,8 +151,8 @@
     <string name="prefs_lotw_title">LoTW 已确认网格</string>
     <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 拉取已确认 QSO 的网格并与 Wavelog 网格合并（当前 %1$d 个）。密码仅保存在手机本地。填好直接点同步，会自动保存并拉取。</string>
-    <string name="prefs_lotw_sync">立即同步</string>
+    <string name="prefs_lotw_hint">直接从 ARRL LoTW 拉取该呼号已确认 QSO 的网格并覆盖本地已存集合（当前 %1$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">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>

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

@@ -186,8 +186,8 @@
     <string name="prefs_lotw_title">LoTW confirmed grids</string>
     <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 and merge them with Wavelog grids (currently %1$d). The password is stored on this device only. Just tap Sync — credentials are saved automatically.</string>
-    <string name="prefs_lotw_sync">Sync now</string>
+    <string name="prefs_lotw_hint">Fetch confirmed-QSO grids directly from ARRL LoTW for this callsign and replace the stored set (currently %1$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">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>

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

@@ -56,6 +56,11 @@ class MaidenheadGridOverlay : Overlay() {
         style = android.graphics.Paint.Style.FILL
         color = Color.argb(90, 76, 217, 100)
     }
+    private val ownLinePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        strokeWidth = 4.5f
+        style = Paint.Style.STROKE
+        color = Color.argb(255, 90, 200, 255)
+    }
 
     /** Worked gridsquares (4-char, uppercase) to highlight, e.g. {"OL62", "PM95"}. */
     var workedGrids: Set<String> = emptySet()
@@ -63,10 +68,14 @@ class MaidenheadGridOverlay : Overlay() {
     /** The station's own 4-char gridsquare, drawn with a distinct outline. */
     var ownGrid: String? = null
 
+    /** Viewport width, refreshed each draw; used by projectionToX bounds. */
+    private var canvasWidthPx = 1080f
+
     override fun draw(canvas: Canvas, mapView: MapView, shadow: Boolean) {
         if (shadow || !isEnabled) return
         val projection = mapView.projection
         val zoom = mapView.zoomLevelDouble
+        canvasWidthPx = canvas.width.toFloat()
         val cellLat = if (zoom >= GRID_ZOOM_SUB) SUB_SQUARE_LAT else FIELD_LAT
         val cellLon = if (zoom >= GRID_ZOOM_SUB) SUB_SQUARE_LON else FIELD_LON
 
@@ -85,33 +94,60 @@ class MaidenheadGridOverlay : Overlay() {
         val firstCol = floor(leftLon / cellLon).toInt()
         val lastCol = ceil(rightLon / cellLon).toInt()
         val centerLon = (leftLon + rightLon) / 2.0
+        // World width in screen pixels for the current zoom (256 px per tile,
+        // 2^zoom tiles across the whole 360° world). Used by the custom
+        // Mercator-X computation in projectionToX.
+        val worldWidthPx = 256.0 * Math.pow(2.0, zoom)
 
-        // Worked-grid highlight fills (only meaningful at sub-square zoom)
-        if (workedGrids.isNotEmpty() && zoom >= GRID_ZOOM_SUB) {
-            for (row in firstRow..lastRow) {
-                val lat = row * cellLat
-                if (lat < -90.0 || lat >= 90.0) continue
-                val topLatCell = lat + cellLat
-                if (topLatCell > 90.0) continue
-                val yTop = projectionToY(projection, topLatCell)
-                val yBottom = projectionToY(projection, lat)
-                if (yTop == null || yBottom == null) continue
-                for (col in firstCol..lastCol) {
-                    val lon = col * cellLon
-                    val xLeft = projectionToX(projection, lon, centerLon) ?: continue
-                    val xRight = projectionToX(projection, lon + cellLon, centerLon) ?: continue
-                    if (xRight < 0f || xLeft > canvas.width) continue
-                    if (cellLabel(lat, lon, zoom) in workedGrids) {
-                        canvas.drawRect(xLeft, yTop, xRight, yBottom, workedPaint)
+        // The station's own grid square (4-char, only meaningful at sub-square zoom)
+        val ownCell = ownGrid?.takeIf { zoom >= GRID_ZOOM_SUB }
+
+        // Worked-grid highlight fills.
+        //  - Sub-square zoom: fill each worked 4-char cell directly.
+        //  - Field zoom (two-char labels): do NOT fill whole fields; instead fill
+        //    the individual 2°x1° squares that were worked, without drawing the
+        //    square grid lines — so you see green patches inside the field.
+        if (workedGrids.isNotEmpty()) {
+            if (zoom >= GRID_ZOOM_SUB) {
+                for (row in firstRow..lastRow) {
+                    val lat = row * cellLat
+                    if (lat < -90.0 || lat >= 90.0) continue
+                    val topLatCell = lat + cellLat
+                    if (topLatCell > 90.0) continue
+                    val yTop = projectionToY(projection, topLatCell)
+                    val yBottom = projectionToY(projection, lat)
+                    if (yTop == null || yBottom == null) continue
+                    for (col in firstCol..lastCol) {
+                        val lon = col * cellLon
+                        val xLeft = projectionToX(projection, lon, centerLon, worldWidthPx) ?: continue
+                        val xRight = projectionToX(projection, lon + cellLon, centerLon, worldWidthPx) ?: continue
+                        if (xRight < 0f || xLeft > canvas.width) continue
+                        if (cellLabel(lat, lon, zoom) in workedGrids) {
+                            canvas.drawRect(xLeft, yTop, xRight, yBottom, workedPaint)
+                        }
                     }
                 }
+            } else {
+                for (grid in workedGrids) {
+                    val cell = gridCellBounds(grid) ?: continue
+                    if (cell.lonRight <= leftLon || cell.lonLeft >= rightLon ||
+                        cell.latTop <= bottomLat || cell.latBottom >= topLat
+                    ) continue
+                    val yTop = projectionToY(projection, cell.latTop) ?: continue
+                    val yBottom = projectionToY(projection, cell.latBottom) ?: continue
+                    val xLeft = projectionToX(projection, cell.lonLeft, centerLon, worldWidthPx) ?: continue
+                    val xRight = projectionToX(projection, cell.lonRight, centerLon, worldWidthPx) ?: continue
+                    if (xRight < 0f || xLeft > canvas.width) continue
+                    if (yBottom < 0f || yTop > canvas.height) continue
+                    canvas.drawRect(xLeft, yTop, xRight, yBottom, workedPaint)
+                }
             }
         }
 
         // Vertical lines (meridians)
         for (col in firstCol..lastCol) {
             val lon = col * cellLon
-            val x = projectionToX(projection, lon, centerLon)
+            val x = projectionToX(projection, lon, centerLon, worldWidthPx)
             if (x == null) continue
             canvas.drawLine(x, 0f, x, canvas.height.toFloat(), linePaint)
         }
@@ -124,6 +160,27 @@ class MaidenheadGridOverlay : Overlay() {
             canvas.drawLine(0f, y, canvas.width.toFloat(), y, linePaint)
         }
 
+        // The station's own grid square: redraw its four borders thicker on top.
+        if (ownCell != null) {
+            val ownColIdx = firstCol..lastCol
+            for (row in firstRow..lastRow) {
+                val lat = row * cellLat
+                if (lat < -90.0 || lat >= 90.0) continue
+                for (col in ownColIdx) {
+                    val lon = col * cellLon
+                    if (cellLabel(lat, lon, zoom) != ownCell) continue
+                    val yTop = projectionToY(projection, lat + cellLat) ?: continue
+                    val yBottom = projectionToY(projection, lat) ?: continue
+                    val xLeft = projectionToX(projection, lon, centerLon, worldWidthPx) ?: continue
+                    val xRight = projectionToX(projection, lon + cellLon, centerLon, worldWidthPx) ?: continue
+                    canvas.drawLine(xLeft, yTop, xRight, yTop, ownLinePaint)
+                    canvas.drawLine(xLeft, yBottom, xRight, yBottom, ownLinePaint)
+                    canvas.drawLine(xLeft, yTop, xLeft, yBottom, ownLinePaint)
+                    canvas.drawLine(xRight, yTop, xRight, yBottom, ownLinePaint)
+                }
+            }
+        }
+
         // Labels: centered in each cell, only when the cell is large enough on
         // screen to hold a label (avoid clutter at low zoom)
         val showLabels = when {
@@ -154,8 +211,8 @@ class MaidenheadGridOverlay : Overlay() {
             if (yBottom < 0f || yTop > canvas.height) continue
             for (col in firstCol..lastCol) {
                 val lon = col * cellLon
-                val xLeft = projectionToX(projection, lon, centerLon) ?: continue
-                val xRight = projectionToX(projection, lon + cellLon, centerLon) ?: continue
+                val xLeft = projectionToX(projection, lon, centerLon, worldWidthPx) ?: continue
+                val xRight = projectionToX(projection, lon + cellLon, centerLon, worldWidthPx) ?: continue
                 if (xRight < 0f || xLeft > canvas.width) continue
                 val label = cellLabel(lat, lon, zoom)
                 canvas.drawText(label, (xLeft + xRight) / 2f, yCenter, labelPaint)
@@ -164,18 +221,18 @@ class MaidenheadGridOverlay : Overlay() {
     }
 
     /** X pixel for a longitude (meridians are vertical in Web Mercator). */
-    private fun projectionToX(projection: Projection, lon: Double, centerLon: Double): Float? {
-        // osmdroid clips Mercator X to [0, mapSize], which destroys the projection of
-        // longitudes outside the [0, 360) window of the current view (visible at low
-        // zoom where the whole world is narrower than the viewport). Normalizing the
-        // longitude to the equivalent value closest to the view center keeps every
-        // meridian's X near the center, safely inside the clip window.
-        var normalized = lon
-        while (normalized < centerLon - 180.0) normalized += 360.0
-        while (normalized > centerLon + 180.0) normalized -= 360.0
-        val geo = org.osmdroid.util.GeoPoint(0.0, normalized)
+    private fun projectionToX(projection: Projection, lon: Double, centerLon: Double, worldWidthPx: Double): Float? {
+        // Do NOT use osmdroid's toPixels() here: at low zoom its wrap-around
+        // logic (getCloserPixel) mis-projects longitudes far from the view
+        // center, which makes meridians vanish while panning. Mercator X is
+        // linear in longitude, so compute it directly:
+        //   x = screenCenterX + (lon - centerLon) / 360 * worldWidthPx
+        var delta = lon - centerLon
+        while (delta > 180.0) delta -= 360.0
+        while (delta < -180.0) delta += 360.0
+        val geo = org.osmdroid.util.GeoPoint(0.0, centerLon)
         val p = projection.toPixels(geo, null)
-        return if (p.x in -MAX_OVERSHOOT_PX..MAX_OVERSHOOT_PX + 4096) p.x.toFloat() else null
+        return (p.x + delta / 360.0 * worldWidthPx).toFloat()
     }
 
     /** Y pixel for a latitude, or null when outside the viewport. */
@@ -200,6 +257,30 @@ class MaidenheadGridOverlay : Overlay() {
         return "$field$squareLon$squareLat"
     }
 
+    /**
+     * Geographic bounds of a 4-char Maidenhead square (e.g. "OL62"):
+     * 2° wide in longitude, 1° tall in latitude.
+     */
+    private fun gridCellBounds(grid: String): CellBounds? {
+        val g = grid.trim().uppercase()
+        if (g.length < 4) return null
+        val fieldLon = g[0] - 'A'
+        val fieldLat = g[1] - 'A'
+        val sqLon = g[2] - '0'
+        val sqLat = g[3] - '0'
+        if (fieldLon !in 0..17 || fieldLat !in 0..17 || sqLon !in 0..9 || sqLat !in 0..9) return null
+        val lonLeft = -180.0 + fieldLon * FIELD_LON + sqLon * SUB_SQUARE_LON
+        val latBottom = -90.0 + fieldLat * FIELD_LAT + sqLat * SUB_SQUARE_LAT
+        return CellBounds(lonLeft, lonLeft + SUB_SQUARE_LON, latBottom, latBottom + SUB_SQUARE_LAT)
+    }
+
+    private data class CellBounds(
+        val lonLeft: Double,
+        val lonRight: Double,
+        val latBottom: Double,
+        val latTop: Double
+    )
+
     private fun normalizeLon(lon: Double): Double {
         var l = lon % 360.0
         if (l >= 180.0) l -= 360.0

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

@@ -139,6 +139,10 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
     val isTimeAos = uiState.mapData?.isTimeAos ?: true
 
     LaunchedEffect(uiState.track) {
+        // In grid mode the map is centered on the local grid square; following
+        // the satellite subpoint here would override that centering on every
+        // track update, so skip the tracking animation entirely.
+        if (uiState.isGridMode) return@LaunchedEffect
         val firstPos = uiState.track?.firstOrNull()?.firstOrNull() ?: return@LaunchedEffect
         mapView.controller.animateTo(GeoPoint(firstPos.latitude, firstPos.longitude))
     }
@@ -161,15 +165,22 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
         }
         ElevatedCard(modifier = Modifier.weight(1f)) {
             Box(contentAlignment = Alignment.BottomCenter) {
-                // Track grid-mode transitions so the map only re-centers when the
-                // mode is switched ON, not on every recomposition.
-                var prevGridMode by remember { mutableStateOf(uiState.isGridMode) }
+                // Track grid-mode transitions; initial value false so that entering
+                // the map page with grid mode already ON also centers the map.
+                var prevGridMode by remember { mutableStateOf(false) }
                 AndroidView({ mapView }) { view ->
+                    // Center on the station grid whenever entering grid mode.
+                    // Only mark the transition as consumed once a real position
+                    // was available; otherwise a first frame with a null
+                    // stationPosition would swallow the centering forever.
+                    val shouldCenter = uiState.isGridMode && !prevGridMode
                     setGridMode(
                         uiState.isGridMode, uiState.workedGrids, view,
-                        if (uiState.isGridMode && !prevGridMode) uiState.stationPosition else null
+                        if (shouldCenter) uiState.stationPosition else null
                     )
-                    prevGridMode = uiState.isGridMode
+                    if (!shouldCenter || uiState.stationPosition != null) {
+                        prevGridMode = uiState.isGridMode
+                    }
                     if (!uiState.isGridMode) {
                         uiState.stationPosition?.let { setStationPosition(it, view) }
                         uiState.track?.let { setSatelliteTrack(it, view) }
@@ -289,10 +300,12 @@ private fun setGridMode(
         if (gridOverlay is MaidenheadGridOverlay) {
             gridOverlay.isEnabled = gridMode
             gridOverlay.workedGrids = workedGrids
+            gridOverlay.ownGrid = ownGridOf(stationPosition)
         } else {
             mapView.overlays[OVERLAY_GRID] = MaidenheadGridOverlay().apply {
                 isEnabled = gridMode
                 this.workedGrids = workedGrids
+                this.ownGrid = ownGridOf(stationPosition)
             }
         }
         // Satellite-related layers are hidden in grid mode; the grid overlay
@@ -317,6 +330,18 @@ private fun setGridMode(
     }
 }
 
+/** The station's 4-char Maidenhead gridsquare, e.g. "OL62", or null without a position. */
+private fun ownGridOf(stationPosition: GeoPos?): String? {
+    val pos = stationPosition ?: return null
+    val lat = pos.latitude
+    val lon = pos.longitude
+    val fieldLat = ((lat + 90.0) / 10.0).toInt().coerceIn(0, 17)
+    val fieldLon = ((lon + 180.0) / 20.0).toInt().coerceIn(0, 17)
+    val subLat = ((lat + 90.0) % 10.0).toInt()
+    val subLon = ((lon + 180.0) % 20.0 / 2.0).toInt()
+    return "${'A' + fieldLon}${'A' + fieldLat}$subLon$subLat"
+}
+
 private fun setStationPosition(stationPos: GeoPos, mapView: MapView) {
     try {
         val overlay = mapView.overlays[OVERLAY_STATION]

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

@@ -63,6 +63,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.rtbishop.look4sat.core.domain.repository.MutualPassData
 import com.rtbishop.look4sat.core.domain.repository.TrackSampleData
+import com.rtbishop.look4sat.core.presentation.GridTargetChip
 import com.rtbishop.look4sat.core.presentation.R
 import com.rtbishop.look4sat.core.presentation.ScreenColumn
 import com.rtbishop.look4sat.core.presentation.TopBar
@@ -88,7 +89,8 @@ fun MutualScreen(
                     Text(
                         text = stringResource(R.string.mutual_title),
                         style = MaterialTheme.typography.titleMedium,
-                        fontWeight = FontWeight.Bold
+                        fontWeight = FontWeight.Bold,
+                        modifier = Modifier.padding(start = 12.dp)
                     )
                 },
                 bottomInfo = {
@@ -98,7 +100,9 @@ fun MutualScreen(
                         color = MaterialTheme.colorScheme.onSurfaceVariant,
                         maxLines = 1,
                         overflow = TextOverflow.Ellipsis,
-                        modifier = Modifier.weight(1f)
+                        modifier = Modifier
+                            .weight(1f)
+                            .padding(start = 12.dp)
                     )
                 },
                 endAction = {
@@ -114,7 +118,29 @@ fun MutualScreen(
                                 strokeWidth = 2.dp
                             )
                         }
-                        MutualStatusChip(state)
+                        // Target-grid chip: station B grid (station A defaults to
+                        // the user's own position), bearing/distance from A to B.
+                        val gridB = state.stationBGrid.trim().uppercase()
+                        val posA = com.rtbishop.look4sat.core.domain.utility.qthToPosition(state.stationAGrid)
+                            ?: state.stationALat.toDoubleOrNull()?.let { lat ->
+                                state.stationALon.toDoubleOrNull()?.let { lon ->
+                                    com.rtbishop.look4sat.core.domain.predict.GeoPos(lat, lon)
+                                }
+                            }
+                        val posB = com.rtbishop.look4sat.core.domain.utility.qthToPosition(gridB)
+                        if (posA != null && posB != null) {
+                            GridTargetChip(
+                                grid = gridB,
+                                distanceKm = com.rtbishop.look4sat.core.presentation.greatCircleDistanceKm(
+                                    posA.latitude, posA.longitude, posB.latitude, posB.longitude
+                                ),
+                                bearingDeg = com.rtbishop.look4sat.core.presentation.greatCircleBearingDeg(
+                                    posA.latitude, posA.longitude, posB.latitude, posB.longitude
+                                )
+                            )
+                        } else {
+                            GridTargetChip(grid = null, distanceKm = null, bearingDeg = null)
+                        }
                     }
                 }
             )

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

@@ -238,10 +238,13 @@ fun LoTWDialog(
     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 = {
-            onSave(com.rtbishop.look4sat.core.domain.model.LoTWSettings(call.value, pass.value))
-            dismiss()
-        }
+            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
     ) {
         OutlinedTextField(
             value = call.value,
@@ -273,20 +276,6 @@ fun LoTWDialog(
                 modifier = Modifier.padding(horizontal = LocalSpacing.current.large)
             )
         }
-        // Sync uses the values typed in the fields directly — saving and syncing
-        // happen in one step, no need to close and reopen the dialog.
-        Row(
-            horizontalArrangement = Arrangement.End,
-            modifier = Modifier.fillMaxWidth().padding(horizontal = LocalSpacing.current.large)
-        ) {
-            TextButton(
-                onClick = { onSync(com.rtbishop.look4sat.core.domain.model.LoTWSettings(call.value, pass.value)) },
-                enabled = !isSyncing
-            ) {
-                Text(text = if (isSyncing) stringResource(R.string.prefs_lotw_syncing)
-                else stringResource(R.string.prefs_lotw_sync))
-            }
-        }
         Spacer(modifier = Modifier.height(0.dp))
     }
 }

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

@@ -203,18 +203,6 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
             onSave = { onAction(SettingsAction.UpdateRadioControl(it)) }
         )
     }
-    if (dialogs.wavelog) {
-        WavelogDialog(
-            initialSettings = uiState.wavelogSettings,
-            workedGridsCount = uiState.workedGridsCount,
-            isSyncing = uiState.wavelogSyncing,
-            message = uiState.wavelogMessage,
-            dismiss = { dialogs.wavelog = false },
-            onSave = { onAction(SettingsAction.UpdateWavelog(it)) },
-            onSync = { onAction(SettingsAction.SyncWorkedGrids(it)) }
-        )
-    }
-
     if (dialogs.lotw) {
         LoTWDialog(
             initialSettings = uiState.lotwSettings,
@@ -330,13 +318,6 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
                     onRadioControlClick = { dialogs.radioControl = true }
                 )
             }
-            item {
-                WavelogCard(
-                    settings = uiState.wavelogSettings,
-                    workedGridsCount = uiState.workedGridsCount,
-                    showWavelogDialog = { dialogs.wavelog = true }
-                )
-            }
             item {
                 LoTWCard(
                     settings = uiState.lotwSettings,
@@ -581,44 +562,6 @@ private fun SwitchRow(labelResId: Int, checked: Boolean, onCheckedChange: (Boole
     }
 }
 
-@Preview(showBackground = true)
-@Composable
-private fun WavelogCardPreview() = MainTheme {
-    WavelogCard(settings = WavelogSettings("http://192.168.1.10", "wl2_demo"), workedGridsCount = 42) {}
-}
-
-@Composable
-private fun WavelogCard(
-    settings: WavelogSettings,
-    workedGridsCount: Int,
-    showWavelogDialog: () -> Unit
-) {
-    ElevatedCard(modifier = Modifier.fillMaxWidth()) {
-        Column(modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp)) {
-            Text(
-                text = stringResource(id = R.string.prefs_wavelog_title),
-                color = MaterialTheme.colorScheme.primary
-            )
-            Spacer(modifier = Modifier.height(2.dp))
-            Text(
-                text = if (settings.isConfigured) {
-                    stringResource(R.string.prefs_wavelog_configured, workedGridsCount)
-                } else {
-                    stringResource(R.string.prefs_wavelog_not_configured)
-                },
-                style = MaterialTheme.typography.bodySmall,
-                maxLines = 2
-            )
-            Spacer(modifier = Modifier.height(4.dp))
-            CardButton(
-                onClick = showWavelogDialog,
-                text = stringResource(id = R.string.prefs_wavelog_configure),
-                modifier = Modifier.fillMaxWidth()
-            )
-        }
-    }
-}
-
 @Composable
 private fun LoTWCard(
     settings: com.rtbishop.look4sat.core.domain.model.LoTWSettings,

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

@@ -206,10 +206,10 @@ class SettingsViewModel(
                 if (lotwGrids == null) {
                     state.copy(lotwSyncing = false, lotwMessage = "LoTW sync failed — check callsign/password/network")
                 } else {
-                    // Merge with Wavelog grids: union of both sources, all confirmed/worked
-                    val merged = settingsRepo.getWorkedGrids() + lotwGrids
-                    settingsRepo.setWorkedGrids(merged)
-                    state.copy(lotwSyncing = false, workedGridsCount = merged.size, lotwMessage = null)
+                    // Wavelog entry removed: LoTW is now the only source, so the
+                    // synced set fully replaces the stored worked grids.
+                    settingsRepo.setWorkedGrids(lotwGrids)
+                    state.copy(lotwSyncing = false, workedGridsCount = lotwGrids.size, lotwMessage = null)
                 }
             }
         }

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 #noinspection UnusedVersionCatalogEntry
-appVersionCode = "455"
+appVersionCode = "459"
 #noinspection UnusedVersionCatalogEntry
-appVersionName = "4.4.6-ba7opf.9.3"
+appVersionName = "4.4.6-ba7opf.9.7"
 #noinspection UnusedVersionCatalogEntry
 compileSdk = "37"
 #noinspection UnusedVersionCatalogEntry