chore: remove dist/ from tracking, add to .gitignore

When adjusting RX in passband mode (via +/- buttons or slider), the old
code used TransponderMapper.mapDownlinkToUplink (pure passband mapping
without Doppler compensation), producing ~10kHz error at LEO velocities.

Fix: use DopplerFrequencyCalculator.computeUplinkFromDownlinkWithOffset
for the full TX-from-RX round-trip, matching the RX→PASSBAND button
onClick logic. Also fixed frame mismatch: position now uses txLow/txRange
(Doppler-shifted frame) consistently.

.gitignore

@@ -68,3 +68,4 @@ fastlane/readme.md
 /app/release/output-metadata.json
 /app/release/
 /.kotlin/sessions/
+dist/

README.md

@@ -23,4 +23,14 @@
 
 ## 许可证
 
-GNU General Public License v3.0。详见 [LICENSE](LICENSE)。
+GNU General Public License v3.0。详见 [LICENSE](LICENSE)。
+
+## Star History
+
+<a href="https://star-history.dera.page/#atsunatsu/Look4Sat&type=timeline&legend=top-left">
+ <picture>
+   <source media="(prefers-color-scheme: dark)" srcset="https://star-history.dera.page/svg?repos=atsunatsu/Look4Sat&type=timeline&theme=dark&legend=top-left" />
+   <source media="(prefers-color-scheme: light)" srcset="https://star-history.dera.page/svg?repos=atsunatsu/Look4Sat&type=timeline&legend=top-left" />
+   <img alt="Star History Chart" src="https://star-history.dera.page/svg?repos=atsunatsu/Look4Sat&type=timeline&legend=top-left" />
+ </picture>
+</a>

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

@@ -49,7 +49,7 @@ class MainActivity : ComponentActivity() {
         super.onCreate(savedInstanceState)
         observeNightFilterState()
         setContent {
-            MainTheme(isDarkTheme = true) { MainScreen() }
+            MainTheme(isDarkTheme = true) { NavRoot() }
         }
     }
 

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

@@ -25,8 +25,6 @@ import androidx.compose.animation.core.rememberInfiniteTransition
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
-import androidx.compose.animation.scaleIn
-import androidx.compose.animation.scaleOut
 import androidx.compose.animation.slideInHorizontally
 import androidx.compose.animation.slideOutHorizontally
 import androidx.compose.animation.togetherWith
@@ -44,7 +42,7 @@ import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.adaptive.navigationsuite.NavigationSuiteDefaults
 import androidx.compose.material3.adaptive.navigationsuite.NavigationSuiteScaffold
@@ -87,37 +85,42 @@ import com.rtbishop.look4sat.feature.passes.PassesDestination
 import com.rtbishop.look4sat.feature.radar.RadarDestination
 import com.rtbishop.look4sat.feature.satellites.SatellitesDestination
 import com.rtbishop.look4sat.feature.settings.SettingsDestination
+import com.rtbishop.look4sat.feature.status.SatStatusDestination
 
 @Composable
 fun NavRoot(deeplink: String? = null) {
     val rootBackStack = rememberNavBackStack(Screen.Passes)
     val deeplinkResolver = DeeplinkResolver()
     LaunchedEffect(deeplink) {
-        deeplink?.let {
-            val destination = deeplinkResolver.resolve(it) // rootBackStack.clear()
-            rootBackStack.add(destination)
-        }
+        deeplink?.let { rootBackStack.add(deeplinkResolver.resolve(it)) }
     }
     val navigateBack: () -> Unit = { rootBackStack.removeLastOrNull() }
-    val slideInTransition = slideInHorizontally(initialOffsetX = { it }) togetherWith scaleOut(targetScale = 0.9f)
-    val slideOutTransition = scaleIn(initialScale = 0.9f) togetherWith slideOutHorizontally(targetOffsetX = { it })
+    val navigateToRadar: () -> Unit = { rootBackStack.add(RadarDestination) }
+    // Incoming screen slides in from the right, outgoing drifts left at 1/3 speed (API35+ style)
+    val pushTransition = slideInHorizontally(tween(300)) { it } togetherWith
+        slideOutHorizontally(tween(300)) { -it / 3 }
+    // 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 = { slideInTransition },
-        popTransitionSpec = { slideOutTransition },
-        predictivePopTransitionSpec = { slideOutTransition },
+        transitionSpec = { pushTransition },
+        popTransitionSpec = { popTransition },
+        predictivePopTransitionSpec = { popTransition },
         entryDecorators = listOf(
-            rememberSaveableStateHolderNavEntryDecorator(), // Required for saving Compose state per entry
-            rememberViewModelStoreNavEntryDecorator() // Required for ViewModel scoping per entry
+            rememberSaveableStateHolderNavEntryDecorator(),
+            rememberViewModelStoreNavEntryDecorator()
         ),
         entryProvider = entryProvider {
-            entry<Screen.Passes> { MainScreen(navigateToRadar = { rootBackStack.add(RadarDestination) }) }
+            entry<Screen.Passes> { MainScreen(navigateToRadar = navigateToRadar) }
             entry<RadarDestination> {
-                Scaffold { innerPadding ->
+                Surface(
+                    modifier = Modifier.fillMaxSize(),
+                    color = MaterialTheme.colorScheme.background
+                ) {
                     RadarDestination(navigateUp = navigateBack)
-                    innerPadding.calculateTopPadding()
                 }
             }
         }
@@ -130,7 +133,7 @@ fun MainScreen(navigateToRadar: () -> Unit = {}) {
     val currentKey = backStack.lastOrNull()
     val navigateBack: () -> Unit = { backStack.removeLastOrNull() }
     val fadeTransition = fadeIn(animationSpec = tween(350)) togetherWith fadeOut(animationSpec = tween(350))
-    val navItems = listOf(Screen.Satellites, Screen.Passes, Screen.Radar, Screen.Mutual, Screen.Map, Screen.Settings)
+    val navItems = listOf(Screen.Satellites, Screen.Passes, Screen.Mutual, Screen.Map, Screen.AMSAT, Screen.Settings)
 
     val context = LocalContext.current
     val container = (context.applicationContext as IContainerProvider).getMainContainer()
@@ -154,9 +157,9 @@ fun MainScreen(navigateToRadar: () -> Unit = {}) {
                     val isSelected = when (currentKey) {
                         is Screen.Satellites -> screen is Screen.Satellites
                         is Screen.Passes -> screen is Screen.Passes
-                        is Screen.Radar -> screen is Screen.Radar
                         is Screen.Mutual -> screen is Screen.Mutual
                         is Screen.Map -> screen is Screen.Map
+                        is Screen.AMSAT -> screen is Screen.AMSAT
                         is Screen.Settings -> screen is Screen.Settings
                         else -> false
                     }
@@ -203,13 +206,9 @@ fun MainScreen(navigateToRadar: () -> Unit = {}) {
                             PassesDestination { catNum, aosTime ->
                                 container.setMutualPassData(MutualPassData())
                                 container.satelliteRepo.selectPass(catNum, aosTime)
-                                backStack.add(Screen.Radar)
-//                            navigateToRadar()
+                                navigateToRadar()
                             }
                         }
-                        entry<Screen.Radar> {
-                            RadarDestination(navigateUp = navigateBack)
-                        }
                         entry<Screen.Map> {
                             MapDestination()
                         }
@@ -220,10 +219,11 @@ fun MainScreen(navigateToRadar: () -> Unit = {}) {
                                 navigateToRadar = { catNum, aosTime, pass ->
                                     container.setMutualPassData(pass ?: MutualPassData())
                                     container.satelliteRepo.selectPass(catNum, aosTime)
-                                    backStack.add(Screen.Radar)
+                                    navigateToRadar()
                                 }
                             )
                         }
+                        entry<Screen.AMSAT> { SatStatusDestination() }
                         entry<Screen.Settings> {
                             SettingsDestination()
                         }
@@ -249,7 +249,7 @@ fun MainScreen(navigateToRadar: () -> Unit = {}) {
                                 if (pass != null) {
                                     container.setMutualPassData(MutualPassData())
                                     container.satelliteRepo.selectPass(pass.catNum, pass.aosTime)
-                                    backStack.add(Screen.Radar)
+                                    navigateToRadar()
                                 }
                             }
                             .padding(horizontal = 12.dp, vertical = 6.dp)

build-logic/convention/src/main/java/com/rtbishop/look4sat/convention/ApplicationPlugin.kt

@@ -37,6 +37,7 @@ internal class ApplicationPlugin : Plugin<Project> {
             implementation(project(":feature:radar"))
             implementation(project(":feature:satellites"))
             implementation(project(":feature:settings"))
+            implementation(project(":feature:status"))
             implementation(libs.androidx.core.splashscreen)
             implementation(libs.compose.material3.adaptive)
             implementation(libs.compose.navigation3)

core/data/src/main/java/com/rtbishop/look4sat/core/data/framework/NetworkReporter.kt

@@ -17,8 +17,10 @@
  */
 package com.rtbishop.look4sat.core.data.framework
 
+import com.rtbishop.look4sat.core.domain.model.Constants
 import com.rtbishop.look4sat.core.domain.repository.IReporter
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
@@ -31,18 +33,30 @@ class NetworkReporter(
     private val rotatorServer: String,
     private val rotatorPort: Int,
     private val frequencyServer: String,
-    private val frequencyPort: Int
+    private val frequencyPort: Int,
+    private val frequencyOffsetHz: Long = 0L
 ) : IReporter {
 
     private val writeMutex = Mutex()
+    private val connectionMutex = Mutex()
+    private val frequencyCommands = Channel<String>(Channel.CONFLATED)
 
     private var rotatorSocket: SocketChannel? = null
     private var rotatorConnected = false
-    private var rotatorConnecting = false
 
     private var frequencySocket: SocketChannel? = null
     private var frequencyConnected = false
-    private var frequencyConnecting = false
+
+    init {
+        // Keep only the latest frequency command to avoid stale backlog and effective lag.
+        reporterScope.launch {
+            for (command in frequencyCommands) {
+                ensureFrequencyConnected()
+                if (!frequencyConnected) continue
+                write(frequencySocket, command) { resetFrequencyConnection() }
+            }
+        }
+    }
 
     override fun reportRotation(format: String, azimuth: Double, elevation: Double) {
         reporterScope.launch {
@@ -53,51 +67,48 @@ class NetworkReporter(
                 .replace($$"$AZ", azimuth.toString())
                 .replace($$"$EL", el.toString())
                 .unescapeControlChars()
-            write(rotatorSocket, command) { rotatorConnected = false }
+            write(rotatorSocket, command) { resetRotatorConnection() }
         }
     }
 
     override fun reportFrequency(format: String, frequency: Long) {
-        reporterScope.launch {
-            ensureFrequencyConnected()
-            if (!frequencyConnected) return@launch
-            val command = format
-                .replace($$"$FREQ", frequency.toString())
-                .unescapeControlChars()
-            write(frequencySocket, command) { frequencyConnected = false }
-        }
+        val clampedOffset = frequencyOffsetHz.coerceIn(
+            Constants.FREQ_OFFSET_MIN_HZ,
+            Constants.FREQ_OFFSET_MAX_HZ
+        )
+        val correctedFreq = frequency.coerceAtLeast(0L).safeAdd(clampedOffset).coerceAtLeast(0L)
+        val command = format
+            .replace($$"$FREQ", correctedFreq.toString())
+            .unescapeControlChars()
+        frequencyCommands.trySend(command)
     }
 
-    private fun ensureRotatorConnected() {
-        if (rotatorConnected || rotatorConnecting || rotatorServer.isBlank()) return
-        reporterScope.launch {
+    private suspend fun ensureRotatorConnected() {
+        connectionMutex.withLock {
+            if (rotatorConnected || rotatorServer.isBlank()) return
             try {
-                rotatorConnecting = true
+                resetRotatorConnection()
                 rotatorSocket = SocketChannel.open(InetSocketAddress(rotatorServer, rotatorPort))
                 rotatorConnected = true
                 println("NetworkReporter: Rotator connected to $rotatorServer:$rotatorPort")
             } catch (e: Exception) {
                 println("NetworkReporter rotator connect error: ${e.message}")
-                rotatorConnected = false
-            } finally {
-                rotatorConnecting = false
+                resetRotatorConnection()
             }
         }
     }
 
-    private fun ensureFrequencyConnected() {
-        if (frequencyConnected || frequencyConnecting || frequencyServer.isBlank()) return
-        reporterScope.launch {
+    private suspend fun ensureFrequencyConnected() {
+        connectionMutex.withLock {
+            if (frequencyConnected || frequencyServer.isBlank()) return
             try {
-                frequencyConnecting = true
+                resetFrequencyConnection()
                 frequencySocket = SocketChannel.open(InetSocketAddress(frequencyServer, frequencyPort))
                 frequencyConnected = true
                 println("NetworkReporter: Frequency connected to $frequencyServer:$frequencyPort")
             } catch (e: Exception) {
                 println("NetworkReporter frequency connect error: ${e.message}")
-                frequencyConnected = false
-            } finally {
-                frequencyConnecting = false
+                resetFrequencyConnection()
             }
         }
     }
@@ -106,7 +117,9 @@ class NetworkReporter(
         try {
             writeMutex.withLock {
                 val buffer = ByteBuffer.wrap("$command\n".toByteArray())
-                socket?.write(buffer)
+                while (buffer.hasRemaining()) {
+                    socket?.write(buffer)
+                }
             }
         } catch (e: Exception) {
             println("NetworkReporter write error: ${e.message}")
@@ -114,6 +127,34 @@ class NetworkReporter(
         }
     }
 
+    private fun resetRotatorConnection() {
+        rotatorConnected = false
+        closeQuietly(rotatorSocket)
+        rotatorSocket = null
+    }
+
+    private fun resetFrequencyConnection() {
+        frequencyConnected = false
+        closeQuietly(frequencySocket)
+        frequencySocket = null
+    }
+
+    private fun closeQuietly(socket: SocketChannel?) {
+        try {
+            socket?.close()
+        } catch (_: Exception) {}
+    }
+
+    private fun Long.safeAdd(delta: Long): Long {
+        return when {
+            delta > 0 && this > Long.MAX_VALUE - delta -> Long.MAX_VALUE
+            delta < 0 && this < Long.MIN_VALUE - delta -> Long.MIN_VALUE
+            else -> this + delta
+        }
+    }
+
     private fun String.unescapeControlChars(): String =
-        replace("\\r", "\r").replace("\\n", "\n").replace("\\t", "\t")
+        replace("""\r""", 13.toChar().toString())
+            .replace("""\n""", 10.toChar().toString())
+            .replace("""\t""", 9.toChar().toString())
 }

core/data/src/main/java/com/rtbishop/look4sat/core/data/injection/MainContainer.kt

@@ -29,6 +29,7 @@ import com.rtbishop.look4sat.core.data.framework.Ft817Controller
 import com.rtbishop.look4sat.core.data.framework.Ic705Controller
 import com.rtbishop.look4sat.core.data.framework.NetworkReporter
 import com.rtbishop.look4sat.core.data.framework.RadioTrackingService
+import com.rtbishop.look4sat.core.data.repository.AmSatRepository
 import com.rtbishop.look4sat.core.data.repository.DatabaseRepo
 import com.rtbishop.look4sat.core.data.repository.SatelliteRepo
 import com.rtbishop.look4sat.core.data.repository.SelectionRepo
@@ -70,12 +71,14 @@ import okhttp3.OkHttpClient
 class MainContainer(private val context: Context) : IMainContainer {
 
     private val localSource = provideLocalSource()
+    private val remoteSource = provideRemoteSource()
     private val mainHandler = CoroutineExceptionHandler { _, error -> println("MainHandler: $error") }
     override val appScope = CoroutineScope(SupervisorJob() + Dispatchers.Default + mainHandler)
     override val settingsRepo = provideSettingsRepo()
     override val selectionRepo = provideSelectionRepo()
     override val satelliteRepo = provideSatelliteRepo()
     override val databaseRepo = provideDatabaseRepo()
+    override val amSatRepo by lazy { AmSatRepository(remoteSource) }
     override val radioTrackingService: IRadioTrackingService by lazy {
         val manager = context.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
         RadioTrackingService(appScope, manager, satelliteRepo, settingsRepo)
@@ -114,7 +117,8 @@ class MainContainer(private val context: Context) : IMainContainer {
             rc.rotatorAddress,
             rc.rotatorPort.toIntOrNull() ?: 0,
             rc.frequencyAddress,
-            rc.frequencyPort.toIntOrNull() ?: 0
+            rc.frequencyPort.toIntOrNull() ?: 0,
+            rc.frequencyOffsetHz
         )
     }
 

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

@@ -0,0 +1,159 @@
+package com.rtbishop.look4sat.core.data.repository
+
+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.model.SatStatusPage
+import com.rtbishop.look4sat.core.domain.repository.IAmSatRepository
+import com.rtbishop.look4sat.core.domain.source.IRemoteSource
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.json.JSONObject
+import java.text.SimpleDateFormat
+import java.util.Calendar
+import java.util.Locale
+import java.util.TimeZone
+
+/** One report from the AMSAT API (data layer model). */
+private data class ApiReport(
+    val id: String,
+    val name: String,
+    val callsign: String,
+    val report: String,
+    val gridSquare: String,
+    val reportedTimeUtcSec: Long
+)
+
+/** AMSAT status repository using RemoteSource (Clean Architecture: data layer handles HTTP). */
+class AmSatRepository(private val remoteSource: IRemoteSource) : IAmSatRepository {
+
+    private val isoUtcFormat = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US).apply {
+        timeZone = TimeZone.getTimeZone("UTC")
+    }
+
+    override suspend fun fetchStatus(): SatStatusPage? = withContext(Dispatchers.IO) {
+        val nowSec = System.currentTimeMillis() / 1000
+        val catalogJson = remoteSource.getAmSatCatalog() ?: return@withContext null
+        // 72h = 3 days; API hard cap is limit=500 regardless of what we send.
+        // 500 records across ~100 catalog satellites ≈ ~1-5 reports/satellite/day — enough for 3 days.
+        // Upgrade path: paginate or request AMSAT to raise the cap if catalog grows beyond ~200 sats.
+        val reportsJson = remoteSource.getAmSatReports(hours = 72, limit = 500) ?: return@withContext null
+        
+        val names = parseCatalog(catalogJson)
+        val reports = parseReports(reportsJson)
+        
+        if (names.isEmpty() && reports.isEmpty()) return@withContext null
+        
+        val statuses = buildStatuses(names, reports, nowSec)
+        val reportMap = reports.associate { it.id to toSatReport(it) }
+        SatStatusPage(System.currentTimeMillis(), statuses, reportMap)
+    }
+
+    /** Parse catalog JSON to list of satellite names */
+    private fun parseCatalog(json: String): List<String> {
+        return try {
+            val arr = JSONObject(json).getJSONArray("data")
+            (0 until arr.length()).map { arr.getJSONObject(it).getString("name") }
+        } catch (_: Exception) {
+            emptyList()
+        }
+    }
+
+    /** Parse reports JSON to list of ApiReport domain objects */
+    private fun parseReports(json: String): List<ApiReport> {
+        return try {
+            val arr = JSONObject(json).getJSONArray("data")
+            (0 until arr.length()).mapNotNull { i ->
+                val o = arr.getJSONObject(i)
+                val iso = o.optString("reported_time", "")
+                if (iso.isEmpty()) null else ApiReport(
+                    id = o.optString("id", ""),
+                    name = o.optString("name", ""),
+                    callsign = o.optString("callsign", ""),
+                    report = o.optString("report", ""),
+                    gridSquare = o.optString("grid_square", ""),
+                    reportedTimeUtcSec = parseIsoUtcSec(iso)
+                )
+            }
+        } catch (_: Exception) {
+            emptyList()
+        }
+    }
+
+    /** Parse ISO 8601 UTC timestamp to epoch seconds (e.g., "2026-08-05T07:30:00Z") */
+    private fun parseIsoUtcSec(iso: String): Long {
+        return try {
+            (isoUtcFormat.parse(iso)?.time ?: 0L) / 1000
+        } catch (_: Exception) {
+            0L
+        }
+    }
+
+    /** Build one SatStatus (3 days x 12 slots) per catalog satellite, slotting reports by age. */
+    private fun buildStatuses(names: List<String>, reports: List<ApiReport>, nowSec: Long): List<SatStatus> {
+        val byName = reports.groupBy { it.name }
+        val monthAbbr = arrayOf("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec")
+        val utc = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
+        val labels = (0 until 3).map { d ->
+            utc.timeInMillis = (nowSec - d * 86400L) * 1000
+            "${monthAbbr[utc.get(Calendar.MONTH)]} ${utc.get(Calendar.DAY_OF_MONTH)}"
+        }
+        return names.map { name ->
+            val slots = (0 until 36).map { slotIdx ->
+                val slotStart = nowSec - (slotIdx + 1) * 7200L
+                val slotEnd = nowSec - slotIdx * 7200L
+                val inSlot = byName[name].orEmpty().filter { it.reportedTimeUtcSec in slotStart until slotEnd }
+                if (inSlot.isEmpty()) {
+                    SatSlot(statusColor = NO_REPORT_GRAY, count = 0)
+                } else {
+                    val newest = inSlot.maxByOrNull { it.reportedTimeUtcSec }!!
+                    SatSlot(
+                        statusColor = statusColorOf(newest.report),
+                        count = inSlot.size,
+                        reportIds = inSlot.map { it.id }
+                    )
+                }
+            }
+            val days = (0 until 3).map { d ->
+                SatDay(dateLabel = labels[d], slots = slots.subList(d * 12, (d + 1) * 12))
+            }
+            SatStatus(name = name, days = days)
+        }
+    }
+
+    private fun toSatReport(r: ApiReport): SatReport {
+        val cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
+        cal.timeInMillis = r.reportedTimeUtcSec * 1000
+        val hh = cal.get(Calendar.HOUR_OF_DAY).toString().padStart(2, '0')
+        val mm = cal.get(Calendar.MINUTE).toString().padStart(2, '0')
+        val y = cal.get(Calendar.YEAR)
+        val mo = (cal.get(Calendar.MONTH) + 1).toString().padStart(2, '0')
+        val d = cal.get(Calendar.DAY_OF_MONTH).toString().padStart(2, '0')
+        return SatReport(
+            id = r.id,
+            statusText = r.report,
+            call = r.callsign,
+            grid = r.gridSquare,
+            dateUtc = "$y-$mo-$d",
+            timeUtc = "$hh:$mm UTC"
+        )
+    }
+
+    /** Map status text to color value (for UI rendering). */
+    private fun statusColorOf(report: String): Long = when (report.lowercase()) {
+        "heard", "crew active" -> ACTIVE_BLUE
+        "telemetry only" -> TLM_ORANGE
+        "not heard" -> NOT_HEARD_PINK
+        else -> CONFLICT_DEEP_ORANGE
+    }
+
+    companion object {
+        // AMSAT official status colors (from amsat.org/status)
+        private const val ACTIVE_BLUE = 0xFF648FFF
+        private const val TLM_ORANGE = 0xFFFFB000
+        private const val NOT_HEARD_PINK = 0xFFDC267F
+        private const val CONFLICT_DEEP_ORANGE = 0xFFFE6100
+        private const val NO_REPORT_GRAY = 0xFFC0C0C0
+    }
+}

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

@@ -66,25 +66,26 @@ class DatabaseRepo(
     }
 
     override suspend fun updateFromRemote() = withContext(dispatcher) {
-        val dataSourcesSettings = settingsRepo.dataSourcesSettings.value
-        val tleUrls = buildMap {
-            putAll(Sources.satelliteDataUrls)
-            if (dataSourcesSettings.useCustomTLE) put(customSourceType, dataSourcesSettings.tleUrl)
-        }.filterValues { it.isNotBlank() }
-        val radioUrls = buildMap {
-            putAll(Sources.transceiversDataUrls)
-            if (dataSourcesSettings.useCustomTransceivers) put(customSourceType, dataSourcesSettings.transceiversUrl)
-        }.filterValues { it.isNotBlank() }
+        val settings = settingsRepo.dataSourcesSettings.value
+        val tleUrls = settings.satelliteUrls.filter { it.isNotBlank() }.map(::normalizeUrl).distinct()
+        val radioUrls = settings.transceiversUrls.filter { it.isNotBlank() }.map(::normalizeUrl).distinct()
+        val builtinTypesByUrl = Sources.satelliteDataUrls
+            .filterValues { it.isNotBlank() }
+            .mapValues { normalizeUrl(it.value) }
+            .entries
+            .associate { (type, url) -> url to type }
+        val importedTypeIds = mutableMapOf<String, MutableList<Int>>()
         // launch all network requests concurrently
-        val tleJobs = tleUrls.values.map { url -> async { url to remoteSource.getNetworkStream(url) } }
-        val radioJobs = radioUrls.values.map { url -> async { url to remoteSource.getNetworkStream(url) } }
-        // parse fetched data concurrently and associate with types
+        val tleJobs = tleUrls.map { url -> async { url to remoteSource.getNetworkStream(url) } }
+        val radioJobs = radioUrls.map { url -> async { url to remoteSource.getNetworkStream(url) } }
+        // parse fetched data concurrently and associate known built-in URLs with existing type filters.
         val importedEntries = tleJobs.awaitAll().flatMap { (url, stream) ->
-            val type = tleUrls.entries.find { it.value == url }?.key ?: customSourceType
-            stream?.let { parseSatelliteStream(url, unwrapIfZipped(url, it)) }.orEmpty().also { entries ->
-                settingsRepo.setSatelliteTypeIds(type, entries.map { it.catnum })
-            }
+            val entries = stream?.let { parseSatelliteStream(url, unwrapIfZipped(url, it)) }.orEmpty()
+            val type = builtinTypesByUrl[url] ?: customSourceType
+            importedTypeIds.getOrPut(type) { mutableListOf() }.addAll(entries.map { it.catnum })
+            entries
         }
+        importedTypeIds.forEach { (type, ids) -> settingsRepo.setSatelliteTypeIds(type, ids.distinct()) }
         val importedRadios = radioJobs.awaitAll().flatMap { (url, stream) ->
             stream?.let { dataParser.parseJSONStream(unwrapIfZipped(url, it)) }.orEmpty()
         }
@@ -100,6 +101,9 @@ class DatabaseRepo(
         setUpdateSuccessful(0L)
     }
 
+    private fun normalizeUrl(url: String): String =
+        if (url.startsWith("http", ignoreCase = true)) url else "https://$url"
+
     private suspend fun parseSatelliteStream(url: String, stream: InputStream): List<OrbitalData> {
         val bufferedStream = stream.buffered()
         return when {

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

@@ -37,6 +37,8 @@ import com.rtbishop.look4sat.core.domain.utility.round
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
+import com.rtbishop.look4sat.core.domain.model.Constants
+import com.rtbishop.look4sat.core.domain.source.Sources
 
 class SettingsRepo(
     private val locationManager: LocationManager,
@@ -67,6 +69,7 @@ class SettingsRepo(
     private val keyFrequencyAddress = "frequencyAddress"
     private val keyFrequencyPort = "frequencyPort"
     private val keyFrequencyFormat = "frequencyFormat"
+    private val keyFrequencyOffsetHz = "frequencyOffsetHz"
     private val keySelectedIds = "selectedIds"
     private val keySelectedTypes = "selectedTypes"
     private val keySelectedModes = "selectedModes"
@@ -91,7 +94,10 @@ class SettingsRepo(
     private val keyUseCustomTransceivers = "useCustomTransceivers"
     private val keyTleUrl = "tleUrl"
     private val keyTransceiversUrl = "transceiversUrl"
+    private val keySatelliteUrls = "satelliteUrls"
+    private val keyTransceiversUrls = "transceiversUrls"
     private val separatorComma = ","
+    private val separatorUrl = "\n"
 
     //region # Satellites selection settings
     private val _satelliteSelection = MutableStateFlow(getSelectedIds())
@@ -298,6 +304,10 @@ class SettingsRepo(
     override val rcSettings: StateFlow<RCSettings> = _rcSettings
 
     override fun updateRCSettings(settings: RCSettings) {
+        val clampedFreqOffsetHz = settings.frequencyOffsetHz.coerceIn(
+            Constants.FREQ_OFFSET_MIN_HZ,
+            Constants.FREQ_OFFSET_MAX_HZ
+        )
         preferences.edit {
             putBoolean(keyRotatorState, settings.rotatorState)
             putString(keyRotatorAddress, settings.rotatorAddress)
@@ -307,6 +317,7 @@ class SettingsRepo(
             putString(keyFrequencyAddress, settings.frequencyAddress)
             putString(keyFrequencyPort, settings.frequencyPort)
             putString(keyFrequencyFormat, settings.frequencyFormat)
+            putLong(keyFrequencyOffsetHz, clampedFreqOffsetHz)
             putBoolean(keyBluetoothRotatorState, settings.bluetoothRotatorState)
             putString(keyBluetoothRotatorFormat, settings.bluetoothRotatorFormat)
             putString(keyBluetoothRotatorName, settings.bluetoothRotatorName)
@@ -315,7 +326,7 @@ class SettingsRepo(
             putString(keyBluetoothFrequencyFormat, settings.bluetoothFrequencyFormat)
             putString(keyBluetoothFrequencyAddress, settings.bluetoothFrequencyAddress)
         }
-        _rcSettings.value = settings
+        _rcSettings.value = settings.copy(frequencyOffsetHz = clampedFreqOffsetHz)
     }
 
     private fun getRCSettings(): RCSettings = RCSettings(
@@ -327,6 +338,8 @@ class SettingsRepo(
         frequencyAddress = preferences.getString(keyFrequencyAddress, null) ?: "127.0.0.1",
         frequencyPort = preferences.getString(keyFrequencyPort, null) ?: "4532",
         frequencyFormat = preferences.getString(keyFrequencyFormat, null) ?: $$"F $FREQ",
+        frequencyOffsetHz = preferences.getLong(keyFrequencyOffsetHz, 0L)
+            .coerceIn(Constants.FREQ_OFFSET_MIN_HZ, Constants.FREQ_OFFSET_MAX_HZ),
         bluetoothRotatorState = preferences.getBoolean(keyBluetoothRotatorState, false),
         bluetoothRotatorFormat = preferences.getString(keyBluetoothRotatorFormat, null) ?: $$"P $AZ $EL",
         bluetoothRotatorName = preferences.getString(keyBluetoothRotatorName, null) ?: "Default",
@@ -382,20 +395,45 @@ class SettingsRepo(
 
     override fun updateDataSourcesSettings(settings: DataSourcesSettings) {
         preferences.edit {
-            putBoolean(keyUseCustomTle, settings.useCustomTLE)
-            putBoolean(keyUseCustomTransceivers, settings.useCustomTransceivers)
-            putString(keyTleUrl, settings.tleUrl)
-            putString(keyTransceiversUrl, settings.transceiversUrl)
+            putString(keySatelliteUrls, settings.satelliteUrls.joinToString(separatorUrl))
+            putString(keyTransceiversUrls, settings.transceiversUrls.joinToString(separatorUrl))
         }
         _dataSourcesSettings.value = settings
     }
 
     private fun getDataSourcesSettings(): DataSourcesSettings = DataSourcesSettings(
-        useCustomTLE = preferences.getBoolean(keyUseCustomTle, false),
-        useCustomTransceivers = preferences.getBoolean(keyUseCustomTransceivers, false),
-        tleUrl = preferences.getString(keyTleUrl, "https://example.com/tle.txt") ?: "",
-        transceiversUrl = preferences.getString(keyTransceiversUrl, "https://example.com/radio.json") ?: ""
+        satelliteUrls = getDataSourceUrls(
+            key = keySatelliteUrls,
+            defaultUrls = Sources.satelliteDataUrls.values.filter { it.isNotBlank() },
+            legacyEnabledKey = keyUseCustomTle,
+            legacyUrlKey = keyTleUrl
+        ),
+        transceiversUrls = getDataSourceUrls(
+            key = keyTransceiversUrls,
+            defaultUrls = Sources.transceiversDataUrls.values.filter { it.isNotBlank() },
+            legacyEnabledKey = keyUseCustomTransceivers,
+            legacyUrlKey = keyTransceiversUrl
+        )
     )
+
+    private fun getDataSourceUrls(
+        key: String,
+        defaultUrls: List<String>,
+        legacyEnabledKey: String,
+        legacyUrlKey: String
+    ): List<String> {
+        val stored = preferences.getString(key, null)
+            ?.split(separatorUrl)
+            ?.map { it.trim() }
+            ?.filter { it.isNotBlank() }
+        if (stored != null) return stored
+        val legacyCustomUrl = preferences.getString(legacyUrlKey, null)?.trim().orEmpty()
+        return if (preferences.getBoolean(legacyEnabledKey, false) && legacyCustomUrl.isNotBlank()) {
+            (defaultUrls + legacyCustomUrl).distinct()
+        } else {
+            defaultUrls
+        }
+    }
     //endregion
 
     //region # Radio control settings

core/data/src/main/java/com/rtbishop/look4sat/core/data/source/RemoteSource.kt

@@ -24,7 +24,6 @@ import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.withContext
 import okhttp3.OkHttpClient
 import okhttp3.Request
-import java.io.ByteArrayInputStream
 import java.io.InputStream
 
 class RemoteSource(
@@ -46,13 +45,49 @@ class RemoteSource(
     override suspend fun getNetworkStream(url: String): InputStream? = withContext(dispatcher) {
         try {
             val networkRequest = Request.Builder().url(url).build()
-            httpClient.newCall(networkRequest).execute().use { response ->
-                if (!response.isSuccessful) return@withContext null
-                ByteArrayInputStream(response.body.bytes())
+            val response = httpClient.newCall(networkRequest).execute()
+            if (!response.isSuccessful) {
+                response.close()
+                return@withContext null
             }
+            // Return the body stream directly as the caller is responsible for closing it.
+            // Closing the stream returns the connection to OkHttp's pool.
+            response.body.byteStream().buffered()
         } catch (exception: Exception) {
             println("RemoteSource network stream exception: $exception")
             null
         }
     }
+
+    override suspend fun getAmSatCatalog(): String? = withContext(dispatcher) {
+        try {
+            val request = Request.Builder()
+                .url("https://www.amsat.org/status/api/v1/catalog.php")
+                .header("User-Agent", "Look4Sat")
+                .build()
+            httpClient.newCall(request).execute().use { response ->
+                if (!response.isSuccessful) return@use null
+                response.body.string()
+            }
+        } catch (exception: Exception) {
+            println("RemoteSource getAmSatCatalog exception: $exception")
+            null
+        }
+    }
+
+    override suspend fun getAmSatReports(hours: Int, limit: Int): String? = withContext(dispatcher) {
+        try {
+            val request = Request.Builder()
+                .url("https://www.amsat.org/status/api/v1/reports.php?hours=$hours&limit=$limit")
+                .header("User-Agent", "Look4Sat")
+                .build()
+            httpClient.newCall(request).execute().use { response ->
+                if (!response.isSuccessful) return@use null
+                response.body.string()
+            }
+        } catch (exception: Exception) {
+            println("RemoteSource getAmSatReports exception: $exception")
+            null
+        }
+    }
 }

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

@@ -91,10 +91,8 @@ class DatabaseRepoTest {
         }
         val settingsRepo = FakeSettingsRepo(
             dataSources = DataSourcesSettings(
-                useCustomTLE = true,
-                useCustomTransceivers = false,
-                tleUrl = customCsvUrl,
-                transceiversUrl = ""
+                satelliteUrls = listOf(customCsvUrl),
+                transceiversUrls = emptyList()
             )
         )
         val repository = DatabaseRepo(dispatcher, dataParser, localSource, remoteSource, settingsRepo)
@@ -124,6 +122,10 @@ private class FakeRemoteSource : IRemoteSource {
     override suspend fun getFileStream(uri: String): InputStream? = fileStreams[uri]?.invoke()
 
     override suspend fun getNetworkStream(url: String): InputStream? = networkStreams[url]?.invoke()
+
+    override suspend fun getAmSatCatalog(): String? = null
+
+    override suspend fun getAmSatReports(hours: Int, limit: Int): String? = null
 }
 
 private class FakeLocalSource : ILocalSource {
@@ -176,7 +178,7 @@ private class FakeSettingsRepo(dataSources: DataSourcesSettings = defaultDataSou
     override val databaseState: MutableStateFlow<DatabaseState> = MutableStateFlow(DatabaseState(0, 0, 0L))
 
     override val rcSettings: StateFlow<RCSettings> = MutableStateFlow(
-        RCSettings(false, "", "", "", false, "", "", "", false, "", "", "", false, "", "")
+        RCSettings(false, "", "", "", false, "", "", "", 0L, false, "", "", "", false, "", "")
     )
 
     override val otherSettings: StateFlow<OtherSettings> = MutableStateFlow(
@@ -226,9 +228,7 @@ private class FakeSettingsRepo(dataSources: DataSourcesSettings = defaultDataSou
 
 private fun defaultDataSourcesSettings(): DataSourcesSettings {
     return DataSourcesSettings(
-        useCustomTLE = false,
-        useCustomTransceivers = false,
-        tleUrl = "",
-        transceiversUrl = ""
+        satelliteUrls = emptyList(),
+        transceiversUrls = emptyList()
     )
 }

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

@@ -0,0 +1,23 @@
+/*
+ * 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.model
+
+object Constants {
+    const val FREQ_OFFSET_MIN_HZ = -50_000L
+    const val FREQ_OFFSET_MAX_HZ = 50_000L
+}

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

@@ -0,0 +1,37 @@
+package com.rtbishop.look4sat.core.domain.model
+
+/** One satellite status report (AMSAT site tooltip data) */
+data class SatReport(
+    val id: String,          // 报告 ID(a885153)
+    val statusText: String,  // Heard / Telemetry Only / Not Heard ...
+    val call: String,        // 呼号
+    val grid: String,        // 网格坐标(可为空)
+    val dateUtc: String,     // 2026-08-04
+    val timeUtc: String      // 2:46-:59 UTC
+)
+
+/** State of one 2-hour slot */
+data class SatSlot(
+    val statusColor: Long,   // ARGB 状态色(-1 = 无报告)
+    val count: Int,          // 报告数量(0 = 无)
+    val reportIds: List<String> = emptyList() // 该槽报告 ID 列表
+)
+
+/** One satellite day (12 two-hour slots) */
+data class SatDay(
+    val dateLabel: String,   // "Aug 4"
+    val slots: List<SatSlot> // 12 槽(00-02 ... 22-24)
+)
+
+/** One satellite, 3 days of state */
+data class SatStatus(
+    val name: String,        // "AO-123_[FM]"
+    val days: List<SatDay>   // 3 days (newest first)
+)
+
+/** Overall page parse result */
+data class SatStatusPage(
+    val fetchedAtUtcMs: Long,
+    val statuses: List<SatStatus>,
+    val reports: Map<String, SatReport> // id → 报告
+)

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

@@ -42,6 +42,7 @@ data class RCSettings(
     val frequencyAddress: String,
     val frequencyPort: String,
     val frequencyFormat: String,
+    val frequencyOffsetHz: Long = 0L,
     val bluetoothRotatorState: Boolean,
     val bluetoothRotatorFormat: String,
     val bluetoothRotatorName: String,
@@ -66,10 +67,8 @@ data class OtherSettings(
 )
 
 data class DataSourcesSettings(
-    val useCustomTLE: Boolean,
-    val useCustomTransceivers: Boolean,
-    val tleUrl: String,
-    val transceiversUrl: String
+    val satelliteUrls: List<String>,
+    val transceiversUrls: List<String>
 )
 
 data class RadioControlSettings(

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/predict/CelestialComputer.kt

@@ -424,11 +424,15 @@ object CelestialComputer {
         }
         if (sunrise == 0.0) sunrise = daynum
 
-        // Phase 4: fast-forward through the day until sun drops back below threshold
-        daynum = sunrise
+        // Phase 4: fast-forward through the day until sun drops back below threshold.
+        // Start from just after sunrise (small offset) so the sun is clearly above
+        // the threshold. This prevents a bug where Phase 3 converges to a point
+        // slightly below -threshold, causing Phase 4 to skip and Phase 5 to converge
+        // to the same time as sunrise, producing identical sunrise/sunset times.
+        daynum = sunrise + 0.001
         sunPos = getSunPosition(observer, daynumToMillis(daynum))
         guard = 0
-        while (sunPos.elevation > -threshold && guard++ < 500) {
+        while (sunPos.elevation >= -threshold && guard++ < 500) {
             daynum += 0.008
             sunPos = getSunPosition(observer, daynumToMillis(daynum))
         }

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

@@ -0,0 +1,9 @@
+package com.rtbishop.look4sat.core.domain.repository
+
+import com.rtbishop.look4sat.core.domain.model.SatStatusPage
+
+/** AMSAT satellite status data source */
+interface IAmSatRepository {
+    /** Fetch and parse the AMSAT status page; null on failure */
+    suspend fun fetchStatus(): SatStatusPage?
+}

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

@@ -30,6 +30,7 @@ interface IMainContainer {
     val selectionRepo: ISelectionRepo
     val satelliteRepo: ISatelliteRepo
     val databaseRepo: IDatabaseRepo
+    val amSatRepo: IAmSatRepository
     val radioTrackingService: IRadioTrackingService
     val mutualPassData: StateFlow<MutualPassData>
     fun setMutualPassData(data: MutualPassData)

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/source/IRemoteSource.kt

@@ -22,4 +22,6 @@ import java.io.InputStream
 interface IRemoteSource {
     suspend fun getFileStream(uri: String): InputStream?
     suspend fun getNetworkStream(url: String): InputStream?
+    suspend fun getAmSatCatalog(): String?
+    suspend fun getAmSatReports(hours: Int, limit: Int): String?
 }

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/source/Sources.kt

@@ -46,9 +46,11 @@ object Sources {
         "Classified" to "https://www.mmccants.org/tles/classfd.zip",
         "McCants" to "https://www.mmccants.org/tles/inttles.zip",
         "R4UAB" to "https://r4uab.ru/satonline.txt",
+        "ARISS" to "https://live.ariss.org/iss.txt",
         "Other" to "" // key for sats filter
     )
     val transceiversDataUrls = mapOf(
-        "SatNOGS" to "https://db.satnogs.org/api/transmitters/?format=json&status=active"
+        "SatNOGS" to "https://db.satnogs.org/api/transmitters/?format=json&status=active",
+        "R4UAB" to "https://r4uab.ru/transmitters.json"
     )
 }

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

@@ -280,6 +280,35 @@ fun getDefaultPass(): OrbitalPass = OrbitalPass(
     altitude = 0, maxElevation = 0.0, orbitalObject = NearEarthObject(defaultOrbitalData), progress = 0f
 )
 
+@Composable
+fun InfoDialog(
+    title: String,
+    onDismiss: () -> Unit,
+    onAccept: () -> Unit,
+    content: @Composable () -> Unit
+) {
+    DialogShell(onDismissRequest = onDismiss) { padding ->
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(start = padding, top = padding, end = padding)
+        ) {
+            Text(
+                text = title,
+                fontSize = 16.sp,
+                fontWeight = FontWeight.Medium,
+                color = MaterialTheme.colorScheme.primary,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+                modifier = Modifier.weight(1f)
+            )
+            CardButton(onClick = onAccept, text = stringResource(R.string.btn_accept))
+        }
+        content()
+    }
+}
+
 @Composable
 fun SharedDialog(
     title: String, onCancel: () -> Unit, onAccept: () -> Unit, content: @Composable () -> Unit

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

@@ -79,6 +79,10 @@ private val lightScheme = lightColorScheme(
     onSecondary = Color(0xFFFFFFFF),
     secondaryContainer = Color(0xFFF1E1BB),
     onSecondaryContainer = Color(0xFF221B04),
+    tertiary = Color(0xFF3C6FE0), // AMSAT Active (darker for light theme)
+    onTertiary = Color(0xFFFFFFFF),
+    tertiaryContainer = Color(0xFFE09800), // AMSAT Telemetry (darker)
+    onTertiaryContainer = Color(0xFF000000),
     background = Color(0xFFFFF8F0),
     onBackground = Color(0xFF1E1B13),
     surface = Color(0xFFFFF8F0),
@@ -101,10 +105,10 @@ private val darkScheme = darkColorScheme(
     onSecondary = Color(0xFF000000),
     secondaryContainer = Color(0xFF404040), // navBar indicator,
     onSecondaryContainer = Color(0xFFE0E0E0), // navBar active icon
-//    tertiary = Color(0xFF121212),
-//    onTertiary = Color(0xFF121212),
-//    tertiaryContainer = Color(0xFF121212),
-//    onTertiaryContainer = Color(0xFF121212),
+    tertiary = Color(0xFF648FFF), // AMSAT Active (from amsat.org/status)
+    onTertiary = Color(0xFF000000),
+    tertiaryContainer = Color(0xFFFFB000), // AMSAT Telemetry
+    onTertiaryContainer = Color(0xFF000000),
     background = Color(0xFF121212),
     onBackground = Color(0xFFE0E0E0),
     surface = Color(0xFF202020), // card background

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

@@ -29,14 +29,14 @@ sealed class Screen(val iconResId: Int, val titleResId: Int) : NavKey {
     @Serializable
     data object Passes : Screen(R.drawable.ic_passes, R.string.nav_pass)
 
-    @Serializable
-    data object Radar : Screen(R.drawable.ic_radar, R.string.nav_radar)
-
     @Serializable
     data object Map : Screen(R.drawable.ic_map, R.string.nav_map)
 
     @Serializable
-    data object Mutual : Screen(R.drawable.ic_match, R.string.nav_mutual)
+    data object Mutual : Screen(R.drawable.ic_radio_tower, R.string.nav_mutual)
+
+    @Serializable
+    data object AMSAT : Screen(R.drawable.ic_satellite_alt, R.string.nav_amsat)
 
     @Serializable
     data object Settings : Screen(R.drawable.ic_settings, R.string.nav_prefs)

core/presentation/src/main/res/drawable/ic_add.xml

@@ -0,0 +1,3 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="24dp" android:height="24dp" android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="@android:color/white" android:pathData="M19,13H13V19H11V13H5V11H11V5H13V11H19V13Z" />
+</vector>

core/presentation/src/main/res/drawable/ic_radio_tower.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path android:fillColor="#FF000000" android:pathData="M12,10A2,2 0 0,1 14,12C14,12.5 13.82,12.94 13.53,13.29L16.7,22H14.57L12,14.93L9.43,22H7.3L10.47,13.29C10.18,12.94 10,12.5 10,12A2,2 0 0,1 12,10M12,8A4,4 0 0,0 8,12C8,12.5 8.1,13 8.28,13.46L7.4,15.86C6.53,14.81 6,13.47 6,12A6,6 0 0,1 12,6A6,6 0 0,1 18,12C18,13.47 17.47,14.81 16.6,15.86L15.72,13.46C15.9,13 16,12.5 16,12A4,4 0 0,0 12,8M12,4A8,8 0 0,0 4,12C4,14.36 5,16.5 6.64,17.94L5.92,19.94C3.54,18.11 2,15.23 2,12A10,10 0 0,1 12,2A10,10 0 0,1 22,12C22,15.23 20.46,18.11 18.08,19.94L17.36,17.94C19,16.5 20,14.36 20,12A8,8 0 0,0 12,4Z" />
+</vector>

core/presentation/src/main/res/drawable/ic_refresh.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Standard Material refresh icon (24dp viewport), centered geometry -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+>
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M17.65,6.35C16.2,4.9 14.21,4 12,4c-4.42,0 -7.99,3.58 -7.99,8s3.57,8 7.99,8c3.73,0 6.84,-2.55 7.73,-6h-2.08c-0.82,2.33 -3.04,4 -5.65,4 -3.31,0 -6,-2.69 -6,-6s2.69,-6 6,-6c1.66,0 3.14,0.69 4.22,1.78L13,11h7V4l-2.35,2.35z" />
+</vector>

core/presentation/src/main/res/drawable/ic_satellite_alt.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- AMSAT tab icon provided by rt-bishop (upstream author), original SVG asset -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <group
+        android:scaleX="0.242"
+        android:scaleY="0.242"
+        android:translateX="0.3"
+        android:translateY="-230.5">
+        <path android:fillColor="#FF000000" android:pathData="m 21.275553,967.35933 a 2.0000048,2.0000048 0 0 0 -1.1875,0.59375 l -13.5000003,13.5 a 2.0000048,2.0000048 0 0 0 0,2.8125 l 18.5625003,18.59382 a 2.0000048,2.0000048 0 0 0 1.2813,0.5625 l 5.5312,0.4375 -4.0312,4.0312 a 2.0000048,2.0000048 0 0 0 0,2.8126 l 13.6874,13.7187 a 2.0000048,2.0000048 0 0 0 2.8438,0 l 4.0312,-4.0312 0.4376,5.5312 a 2.0000048,2.0000048 0 0 0 0.5624,1.2813 l 18.5938,18.5625 a 2.0000048,2.0000048 0 0 0 2.8438,0 l 13.468705,-13.4688 a 2.0000048,2.0000048 0 0 0 0,-2.8437 l -18.562505,-18.5938 a 2.0000048,2.0000048 0 0 0 -1.2812,-0.5625 l -5.5313,-0.4375 4.0313,-4.0313 a 2.0000048,2.0000048 0 0 0 0,-2.8437 l -13.6876,-13.68757 a 2.0000048,2.0000048 0 0 0 -2.8437,0 l -4.0313,4.03125 -0.4374,-5.53125 a 2.0000048,2.0000048 0 0 0 -0.5626,-1.28125 l -18.5937,-18.5625 a 2.0000048,2.0000048 0 0 0 -1.4375,-0.59375 2.0000048,2.0000048 0 0 0 -0.1875,0 z m 0.2187,4.8125 16.6563,16.65625 0.5625,7.46875 -3.7812,3.78127 -7.4688,-0.59377 -16.6562,-16.625 z m 34.5626,41.46887 7.4687,0.5937 16.656305,16.625 -10.687605,10.6875 -16.625,-16.6562 -0.5937,-7.4688 z" />
+        <path android:fillColor="#FF000000" android:pathData="m 50.940553,966.18283 a 2.000005,2.000005 0 1 0 0,3.99969 c 7.9999,0 15.9734,3.03851 22.0884,9.15344 6.103605,6.10359 9.143805,14.08909 9.143805,22.07844 a 2.000005,2.000005 0 1 0 3.9994,0 c 0,-9.00692 -3.4462,-18.03775 -10.315,-24.90657 -6.877605,-6.8775 -15.900305,-10.325 -24.916605,-10.325 z" />
+        <path android:fillColor="#FF000000" android:pathData="m 50.940553,958.36533 a 2.000005,2.000005 0 1 0 0,3.99969 c 10.0021,0 19.9781,3.79987 27.613705,11.43562 7.6352,7.63517 11.4357,17.62207 11.4357,27.61376 a 2.000005,2.000005 0 1 0 3.9997,0 c 0,-11.00842 -4.207,-22.04171 -12.6072,-30.44188 -8.399505,-8.3996 -19.424005,-12.60719 -30.441905,-12.60719 z" />
+        <path android:fillColor="#FF000000" android:pathData="m 50.940553,973.94033 a 2.000005,2.000005 0 1 0 0,3.99938 c 6.0191,0 12.0105,2.279 16.6031,6.87156 4.5926,4.59255 6.881605,10.59683 6.881605,16.60313 a 2.000005,2.000005 0 1 0 3.9997,0 c 0,-7.02618 -2.6961,-14.07429 -8.053105,-19.43126 -5.3571,-5.35696 -12.398,-8.04281 -19.4313,-8.04281 z" />
+        <path android:fillColor="#FF000000" android:pathData="m 50.940553,981.77783 a 2.000005,2.000005 0 1 0 0,3.99938 c 4.0058,0 7.9968,1.51836 11.0578,4.57937 3.061,3.06099 4.5794,7.05193 4.5794,11.05782 a 2.000005,2.000005 0 1 0 3.9994,0 c 0,-5.02276 -1.9251,-10.06035 -5.7507,-13.88594 -3.8256,-3.82559 -8.8631,-5.75063 -13.8859,-5.75063 z" />
+    </group>
+</vector>

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

@@ -112,6 +112,13 @@
     <string name="prefs_data_update_success">Actualización completada con éxito</string>
 
     <string name="prefs_data_sources_title">Custom data sources</string>
+    <string name="prefs_data_import_satellites_error">No satellites imported. Select a valid TLE/3LE (.txt) or OMM (.csv) file.</string>
+    <string name="prefs_data_import_transceivers_error">No transceivers imported. Select a valid SatNOGS (.json) file.</string>
+    <string name="prefs_data_sources_url_title" translatable="false">URL</string>
+    <string name="prefs_data_sources_satellites_label" translatable="false">Satellites data</string>
+    <string name="prefs_data_sources_transceivers_label" translatable="false">Transceivers data</string>
+    <string name="prefs_net_frequency_offset_hint" translatable="false">Frequency offset (Hz)</string>
+    <string name="prefs_net_frequency_offset_help" translatable="false">Range: -50000 to 50000 Hz. Positive values increase reported frequency; negative values decrease it.</string>
     <string name="prefs_data_sources_tle_switch">Custom TLE URL</string>
     <string name="prefs_data_sources_transceivers_switch">Custom transceivers URL</string>
 

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

@@ -111,6 +111,13 @@
     <string name="prefs_data_update_success">Обновление прошло успешно</string>
 
     <string name="prefs_data_sources_title">Свои источники данных</string>
+    <string name="prefs_data_import_satellites_error">No satellites imported. Select a valid TLE/3LE (.txt) or OMM (.csv) file.</string>
+    <string name="prefs_data_import_transceivers_error">No transceivers imported. Select a valid SatNOGS (.json) file.</string>
+    <string name="prefs_data_sources_url_title" translatable="false">URL</string>
+    <string name="prefs_data_sources_satellites_label" translatable="false">Satellites data</string>
+    <string name="prefs_data_sources_transceivers_label" translatable="false">Transceivers data</string>
+    <string name="prefs_net_frequency_offset_hint" translatable="false">Frequency offset (Hz)</string>
+    <string name="prefs_net_frequency_offset_help" translatable="false">Range: -50000 to 50000 Hz. Positive values increase reported frequency; negative values decrease it.</string>
     <string name="prefs_data_sources_tle_switch">Custom TLE URL</string>
     <string name="prefs_data_sources_transceivers_switch">Custom Transceivers URL</string>
 

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

@@ -112,6 +112,13 @@
     <string name="prefs_data_update_success">යාවත්කාලීනය සම්පූර්ණ කිරීම සාර්ථකයි</string>
 
     <string name="prefs_data_sources_title">Custom data sources</string>
+    <string name="prefs_data_import_satellites_error">No satellites imported. Select a valid TLE/3LE (.txt) or OMM (.csv) file.</string>
+    <string name="prefs_data_import_transceivers_error">No transceivers imported. Select a valid SatNOGS (.json) file.</string>
+    <string name="prefs_data_sources_url_title" translatable="false">URL</string>
+    <string name="prefs_data_sources_satellites_label" translatable="false">Satellites data</string>
+    <string name="prefs_data_sources_transceivers_label" translatable="false">Transceivers data</string>
+    <string name="prefs_net_frequency_offset_hint" translatable="false">Frequency offset (Hz)</string>
+    <string name="prefs_net_frequency_offset_help" translatable="false">Range: -50000 to 50000 Hz. Positive values increase reported frequency; negative values decrease it.</string>
     <string name="prefs_data_sources_tle_switch">Custom TLE URL</string>
     <string name="prefs_data_sources_transceivers_switch">Custom transceivers URL</string>
 

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

@@ -143,6 +143,12 @@
     <string name="prefs_data_update_success">Güncelleme başarıyla tamamlandı</string>
 
     <string name="prefs_data_sources_title">Özel veri kaynakları</string>
+    <string name="prefs_data_import_satellites_error">No satellites imported. Select a valid TLE/3LE (.txt) or OMM (.csv) file.</string>
+    <string name="prefs_data_import_transceivers_error">No transceivers imported. Select a valid SatNOGS (.json) file.</string>
+    <string name="prefs_data_sources_satellites_label" translatable="false">Satellites data</string>
+    <string name="prefs_data_sources_transceivers_label" translatable="false">Transceivers data</string>
+    <string name="prefs_net_frequency_offset_hint" translatable="false">Frequency offset (Hz)</string>
+    <string name="prefs_net_frequency_offset_help" translatable="false">Range: -50000 to 50000 Hz. Positive values increase reported frequency; negative values decrease it.</string>
     <string name="prefs_data_sources_tle_switch">Özel TLE URL</string>
     <string name="prefs_data_sources_transceivers_switch">Özel transceiver URL</string>
     <string name="prefs_data_sources_url_title" translatable="false">URL (HTTPS)</string>

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

@@ -112,6 +112,13 @@
     <string name="prefs_data_update_success">Оновлення успішне</string>
 
     <string name="prefs_data_sources_title">Custom data sources</string>
+    <string name="prefs_data_import_satellites_error">No satellites imported. Select a valid TLE/3LE (.txt) or OMM (.csv) file.</string>
+    <string name="prefs_data_import_transceivers_error">No transceivers imported. Select a valid SatNOGS (.json) file.</string>
+    <string name="prefs_data_sources_url_title" translatable="false">URL</string>
+    <string name="prefs_data_sources_satellites_label" translatable="false">Satellites data</string>
+    <string name="prefs_data_sources_transceivers_label" translatable="false">Transceivers data</string>
+    <string name="prefs_net_frequency_offset_hint" translatable="false">Frequency offset (Hz)</string>
+    <string name="prefs_net_frequency_offset_help" translatable="false">Range: -50000 to 50000 Hz. Positive values increase reported frequency; negative values decrease it.</string>
     <string name="prefs_data_sources_tle_switch">Custom TLE URL</string>
     <string name="prefs_data_sources_transceivers_switch">Custom transceivers URL</string>
 

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

@@ -39,6 +39,21 @@
     <string name="pass_welcome_title">欢迎来到 Look4Sat\!</string>
     <string name="pass_welcome_message">请务必在设置中通过GPS、经纬度或QTH定位您的位置\n建议至少每周更新一次数据库，以确保预测结果的准确性</string>
 
+    <!-- AMSAT Status screen -->
+    <string name="nav_amsat">AMSAT</string>
+    <string name="amsat_title">AMSAT 卫星状态</string>
+    <string name="amsat_refresh">刷新</string>
+    <string name="amsat_retry">重试</string>
+    <string name="amsat_updated">更新于：</string>
+    <string name="amsat_active">活跃</string>
+    <string name="amsat_tlm">遥测/信标</string>
+    <string name="amsat_not_heard">未听到</string>
+    <string name="amsat_conflict">冲突</string>
+    <string name="amsat_name">名称</string>
+    <string name="amsat_load_failed">加载失败 - 检查网络后重试</string>
+    <string name="amsat_no_reports">此时间段无报告</string>
+    <string name="amsat_close">关闭</string>
+
     <!-- Radar screen -->
     <string name="radar_back">后退</string>
     <string name="radar_notify">通知</string>
@@ -121,6 +136,9 @@
     <string name="prefs_data_sources_title">自定义数据源</string>
     <string name="prefs_data_sources_tle_switch">自定义TLE URL</string>
     <string name="prefs_data_sources_transceivers_switch">自定义收发器URL</string>
+    <string name="prefs_data_sources_url_title" translatable="false">URL</string>
+    <string name="prefs_data_sources_satellites_label">卫星数据</string>
+    <string name="prefs_data_sources_transceivers_label">收发器数据</string>
 
     <string name="prefs_data_output_title">数据输出</string>
     <string name="prefs_net_output">网络</string>
@@ -134,6 +152,8 @@
     <string name="prefs_net_frequency_switch">启用多普勒频率输出</string>
     <string name="prefs_net_frequency_address_hint">IP:端口</string>
     <string name="prefs_net_frequency_format_hint">数据格式</string>
+    <string name="prefs_net_frequency_offset_hint" translatable="false">频率偏移 (Hz)</string>
+    <string name="prefs_net_frequency_offset_help" translatable="false">范围：-50000 到 50000 Hz。正值提高上报频率，负值降低上报频率。</string>
 
     <string name="prefs_bt_title">蓝牙数据输出</string>
     <string name="prefs_bt_rotator_switch">启用方位俯仰角输出</string>

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

@@ -56,6 +56,21 @@
         \n\n* Added ACCESS_LOCAL_NETWORK permission check to support network data output
     </string>
 
+    <!-- AMSAT Status screen -->
+    <string name="nav_amsat">AMSAT</string>
+    <string name="amsat_title">AMSAT Satellite Status</string>
+    <string name="amsat_refresh">Refresh</string>
+    <string name="amsat_retry">Retry</string>
+    <string name="amsat_updated">Updated:</string>
+    <string name="amsat_active">Active</string>
+    <string name="amsat_tlm">TLM/Beacon</string>
+    <string name="amsat_not_heard">Not Heard</string>
+    <string name="amsat_conflict">Conflicting</string>
+    <string name="amsat_name">Name</string>
+    <string name="amsat_load_failed">Load failed - check network and retry</string>
+    <string name="amsat_no_reports">No reports for this period</string>
+    <string name="amsat_close">Close</string>
+
     <!-- Radar screen -->
     <string name="radar_back">Back</string>
     <string name="radar_notify">Notify</string>
@@ -156,6 +171,8 @@
     <string name="prefs_data_sources_tle_switch">Custom TLE URL</string>
     <string name="prefs_data_sources_transceivers_switch">Custom transceivers URL</string>
     <string name="prefs_data_sources_url_title" translatable="false">URL (HTTPS)</string>
+    <string name="prefs_data_sources_satellites_label">Satellites data</string>
+    <string name="prefs_data_sources_transceivers_label">Transceivers data</string>
 
     <string name="prefs_data_output_title">Data output</string>
     <string name="prefs_net_output">Network</string>
@@ -179,6 +196,8 @@
     <string name="prefs_net_frequency_switch">Enable frequency output</string>
     <string name="prefs_net_frequency_address_hint">IP:Port</string>
     <string name="prefs_net_frequency_format_hint">Format</string>
+    <string name="prefs_net_frequency_offset_hint" translatable="false">Frequency offset (Hz)</string>
+    <string name="prefs_net_frequency_offset_help" translatable="false">Range: -50000 to 50000 Hz. Positive values increase reported frequency; negative values decrease it.</string>
 
     <string name="prefs_bt_title">Bluetooth data output</string>
     <string name="prefs_bt_rotator_switch">Enable rotation output</string>

feature/passes/src/main/java/com/rtbishop/look4sat/feature/passes/PassesViewModel.kt

@@ -23,6 +23,7 @@ import androidx.lifecycle.viewmodel.initializer
 import androidx.lifecycle.viewmodel.viewModelFactory
 import com.rtbishop.look4sat.core.domain.model.PassesSettings
 import com.rtbishop.look4sat.core.domain.predict.CelestialComputer
+import com.rtbishop.look4sat.core.domain.predict.GeoPos
 import com.rtbishop.look4sat.core.domain.predict.OrbitalPass
 import com.rtbishop.look4sat.core.domain.repository.IMainContainer
 import com.rtbishop.look4sat.core.domain.repository.ISatelliteRepo
@@ -167,6 +168,7 @@ class PassesViewModel(
     // CelestialComputer.findSunRiseSet() returns the next rise/set after the supplied time, so pass
     // the calendar day's 00:00 in the same timezone used by the visible date group. Passing a pass's
     // AOS time can jump to the following day's sunrise/sunset when that AOS is after the local event.
+    // For white nights / polar day edge cases, we fall back to searching from the previous day.
     private fun computeSunTimes(passes: List<OrbitalPass>, isUtc: Boolean): Map<String, Pair<String, String>> {
         val stationPos = settingsRepo.stationPosition.value
         val tz = if (isUtc) TimeZone.getTimeZone("UTC") else TimeZone.getDefault()
@@ -175,7 +177,7 @@ class PassesViewModel(
         val result = LinkedHashMap<String, Pair<String, String>>()
         // DeepSpace group always shows today's sun times
         if (passes.any { it.isDeepSpace }) {
-            val riseSet = CelestialComputer.findSunRiseSet(stationPos, startOfDayMillis(System.currentTimeMillis(), tz))
+            val riseSet = findTodaySunRiseSet(stationPos, startOfDayMillis(System.currentTimeMillis(), tz))
             val rise = if (riseSet.riseTimeMillis > 0) sdfTime.format(Date(riseSet.riseTimeMillis)) else "--:--"
             val set = if (riseSet.setTimeMillis > 0) sdfTime.format(Date(riseSet.setTimeMillis)) else "--:--"
             result["DeepSpace (period >225min)"] = rise to set
@@ -184,7 +186,7 @@ class PassesViewModel(
             if (pass.isDeepSpace) continue
             val label = sdfDate.format(Date(pass.aosTime))
             if (label in result) continue
-            val riseSet = CelestialComputer.findSunRiseSet(stationPos, startOfDayMillis(pass.aosTime, tz))
+            val riseSet = findTodaySunRiseSet(stationPos, startOfDayMillis(pass.aosTime, tz))
             val rise = if (riseSet.riseTimeMillis > 0) sdfTime.format(Date(riseSet.riseTimeMillis)) else "--:--"
             val set = if (riseSet.setTimeMillis > 0) sdfTime.format(Date(riseSet.setTimeMillis)) else "--:--"
             result[label] = rise to set
@@ -192,6 +194,33 @@ class PassesViewModel(
         return result
     }
 
+    /**
+     * Find today's sunrise and sunset by starting from local midnight.
+     * Handles the white nights / polar day edge case where the sun is still above
+     * the -0.8333° threshold at midnight: in that case we search from the previous
+     * day's midnight to find a valid sunrise/sunset pair within the target day.
+     */
+    private fun findTodaySunRiseSet(observer: GeoPos, localMidnightMillis: Long): CelestialComputer.RiseSetTimes {
+        val threshold = 0.8333
+        val sunPos = CelestialComputer.getSunPosition(observer, localMidnightMillis)
+        if (sunPos.elevation > -threshold) {
+            // White nights / polar day: the sun is too high at midnight.
+            // Search from earlier days so the algorithm goes through a full
+            // sunset → sunrise → sunset cycle, landing in the target day.
+            val dayEnd = localMidnightMillis + 86400000L
+            for (offset in 1..3) {
+                val result = CelestialComputer.findSunRiseSet(observer, localMidnightMillis - offset * 86400000L)
+                if (result.riseTimeMillis in localMidnightMillis..dayEnd &&
+                    result.setTimeMillis in localMidnightMillis..dayEnd) {
+                    return result
+                }
+            }
+            // No valid pair found (midnight sun / polar day)
+            return CelestialComputer.RiseSetTimes(0L, 0L)
+        }
+        return CelestialComputer.findSunRiseSet(observer, localMidnightMillis)
+    }
+
     private fun startOfDayMillis(timeMillis: Long, tz: TimeZone): Long {
         return Calendar.getInstance(tz, Locale.getDefault()).apply {
             timeInMillis = timeMillis

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

@@ -18,6 +18,7 @@
 package com.rtbishop.look4sat.feature.radar
 
 import android.app.Activity
+import android.content.Context
 import android.view.LayoutInflater
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.expandVertically
@@ -26,6 +27,8 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.text.BasicTextField
@@ -66,6 +69,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -89,7 +93,6 @@ import androidx.constraintlayout.widget.ConstraintLayout
 import com.rtbishop.look4sat.core.domain.model.SatRadio
 import com.rtbishop.look4sat.core.domain.predict.OrbitalPos
 import com.rtbishop.look4sat.core.domain.utility.DopplerFrequencyCalculator
-import com.rtbishop.look4sat.core.domain.utility.TransponderMapper
 import com.rtbishop.look4sat.core.presentation.CardButton
 import com.rtbishop.look4sat.core.presentation.R
 import com.rtbishop.look4sat.core.presentation.formatFrequency
@@ -160,59 +163,53 @@ fun CalculatorPage(
         return
     }
 
-    LazyColumn(
-        modifier = modifier.fillMaxSize(),
+    Column(
+        modifier = modifier
+            .fillMaxSize()
+            .verticalScroll(rememberScrollState()),
         verticalArrangement = Arrangement.spacedBy(10.dp)
     ) {
         if (calculatorTransceivers.size > 1) {
-            item {
-                FlowRow(
-                    horizontalArrangement = Arrangement.spacedBy(6.dp),
-                    verticalArrangement = Arrangement.spacedBy(4.dp),
-                    modifier = Modifier.fillMaxWidth()
-                ) {
-                    calculatorTransceivers.forEach { radio ->
-                        FilterChip(
-                            selected = radio.uuid == selectedTransceiver.uuid,
-                            onClick = {
-                                if (radio.uuid != selectedUuid) onAction(RadarAction.SelectTransmitter(radio.uuid))
-                            },
-                            label = {
-                                Text(
-                                    text = transceiverTitle(radio),
-                                    maxLines = 1,
-                                    overflow = TextOverflow.Ellipsis
-                                )
-                            }
-                        )
-                    }
+            FlowRow(
+                horizontalArrangement = Arrangement.spacedBy(6.dp),
+                verticalArrangement = Arrangement.spacedBy(4.dp),
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                calculatorTransceivers.forEach { radio ->
+                    FilterChip(
+                        selected = radio.uuid == selectedTransceiver.uuid,
+                        onClick = {
+                            if (radio.uuid != selectedUuid) onAction(RadarAction.SelectTransmitter(radio.uuid))
+                        },
+                        label = {
+                            Text(
+                                text = transceiverTitle(radio),
+                                maxLines = 1,
+                                overflow = TextOverflow.Ellipsis
+                            )
+                        }
+                    )
                 }
             }
         }
 
-        item {
-            DopplerFrequencyCalculator(
-                transponder = selectedTransceiver,
-                orbitalPos = orbitalPos,
-                modifier = Modifier.fillMaxWidth()
-            )
-        }
+        DopplerFrequencyCalculator(
+            transponder = selectedTransceiver,
+            orbitalPos = orbitalPos,
+            modifier = Modifier.fillMaxWidth()
+        )
 
-        item {
-            HorizontalDivider(
-                thickness = 1.dp,
-                color = MaterialTheme.colorScheme.outline.copy(alpha = 0.3f)
-            )
-        }
+        HorizontalDivider(
+            thickness = 1.dp,
+            color = MaterialTheme.colorScheme.outline.copy(alpha = 0.3f)
+        )
 
-        item {
-            CwDecoderPanel(
-                cw = cw,
-                onAction = onAction,
-                requestMicPermission = requestMicPermission,
-                modifier = Modifier.fillMaxWidth()
-            )
-        }
+        CwDecoderPanel(
+            cw = cw,
+            onAction = onAction,
+            requestMicPermission = requestMicPermission,
+            modifier = Modifier.fillMaxWidth()
+        )
     }
 }
 
@@ -555,11 +552,21 @@ private fun DopplerFrequencyCalculator(
 ) {
     if (orbitalPos == null || !DopplerFrequencyCalculator.isLinearTransponder(transponder)) return
 
-    var lastEditedField by remember { mutableStateOf(EditedField.TX) }
-    var txFrequencyHz by remember { mutableStateOf(0L) }
-    var rxFrequencyHz by remember { mutableStateOf(0L) }
-    var passbandPosition by remember { mutableStateOf(0.5f) }
-    var offsetKHz by remember { mutableStateOf("") }
+    var lastEditedField by rememberSaveable(transponder.uuid) { mutableStateOf(EditedField.TX) }
+    var txFrequencyHz by rememberSaveable(transponder.uuid) { mutableStateOf(0L) }
+    var rxFrequencyHz by rememberSaveable(transponder.uuid) { mutableStateOf(0L) }
+    var passbandPosition by rememberSaveable(transponder.uuid) { mutableStateOf(0.5f) }
+    // 每个卫星独立记忆 offset：以 NORAD 编号为 key，存到应用 SharedPreferences
+    val context = LocalContext.current
+    val catnum = transponder.catnum
+    var offsetKHz by remember(catnum) {
+        mutableStateOf(
+            catnum?.let { cn ->
+                context.getSharedPreferences(context.packageName + "_preferences", Context.MODE_PRIVATE)
+                    .getString("offset_khz_$cn", "") ?: ""
+            } ?: ""
+        )
+    }
     var stepSizeKHz by remember { mutableIntStateOf(1) }
 
     val offsetHz = offsetKHz.toDoubleOrNull()?.let { it * 1000 }?.toLong() ?: 0L
@@ -649,12 +656,15 @@ private fun DopplerFrequencyCalculator(
     fun updateRx(newRxHz: Long) {
         when (lastEditedField) {
             EditedField.PASSBAND -> {
-                // Passband 模式：从 RX 反推 TX 位置，TX 用地面频率
-                val pos = ((newRxHz - rxLow).toFloat() / rxRange).coerceIn(0f, 1f)
-                val txFromRx = TransponderMapper.mapDownlinkToUplink(newRxHz, rawTransponder)
+                // Passband 模式：从 RX 经完整往返路径（含多普勒补偿）反推 TX 位置
+                val txFromRx = DopplerFrequencyCalculator.computeUplinkFromDownlinkWithOffset(
+                    newRxHz, rawTransponder, orbitalPos, offsetHz
+                )
                 passbandPosition = if (txFromRx != null) {
-                    ((txFromRx - rawTxLow).toFloat() / rawTxRange).coerceIn(0f, 1f)
-                } else pos
+                    ((txFromRx - txLow).toFloat() / txRange).coerceIn(0f, 1f)
+                } else {
+                    ((rxFrequencyHz - rxLow).toFloat() / rxRange).coerceIn(0f, 1f)
+                }
                 txFrequencyHz = txLow + (passbandPosition * txRange).toLong()
                 rxFrequencyHz = DopplerFrequencyCalculator.computeDownlinkFromUplinkWithOffset(
                     txFrequencyHz, rawTransponder, orbitalPos, offsetHz
@@ -742,7 +752,15 @@ private fun DopplerFrequencyCalculator(
                 ) {
                     BasicTextField(
                         value = offsetKHz,
-                        onValueChange = { offsetKHz = it },
+                        onValueChange = { newValue ->
+                            offsetKHz = newValue
+                            catnum?.let { cn ->
+                                context.getSharedPreferences(
+                                    context.packageName + "_preferences",
+                                    Context.MODE_PRIVATE
+                                ).edit().putString("offset_khz_$cn", newValue).apply()
+                            }
+                        },
                         singleLine = true,
                         textStyle = TextStyle(
                             fontSize = 16.sp,

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

@@ -52,6 +52,21 @@ import com.rtbishop.look4sat.core.presentation.LocalSpacing
 import com.rtbishop.look4sat.core.presentation.MainTheme
 import com.rtbishop.look4sat.core.presentation.R
 import com.rtbishop.look4sat.core.presentation.SharedDialog
+import androidx.compose.animation.core.spring
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListScope
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.mutableLongStateOf
+import androidx.compose.runtime.toMutableStateList
+import androidx.compose.ui.draw.rotate
+import androidx.compose.ui.res.painterResource
+import com.rtbishop.look4sat.core.domain.model.Constants
+import com.rtbishop.look4sat.core.presentation.IconCard
 
 @Preview(showBackground = true)
 @Composable
@@ -116,128 +131,150 @@ fun LocatorDialog(qthLocator: String, dismiss: () -> Unit, save: (String) -> Uni
 private fun TransceiversDialogPreview() {
     MainTheme {
         DataSourcesDialog(
-            useCustomTle = true,
-            useCustomTransceivers = true,
-            tleUrl = "https://example.com/tle.txt",
-            transceiversUrl = "https://example.com/tx.json",
-            requestCustomSourcesPermission = { onGranted, _ -> onGranted() },
+            satelliteUrls = listOf(
+                "celestrak.org/NORAD/elements/gp.php?GROUP=active&FORMAT=csv",
+                "amsat.org/tle/current/nasabare.txt"
+            ),
+            transceiversUrls = listOf(
+                "db.satnogs.org/api/transmitters/?format=json&status=active"
+            ),
             onImportTle = {},
             onImportTransceivers = {},
             onDismiss = {},
-            onSave = { _, _, _, _ -> }
+            onSave = { _, _ -> }
         )
     }
 }
 
 @Composable
 fun DataSourcesDialog(
-    useCustomTle: Boolean,
-    useCustomTransceivers: Boolean,
-    tleUrl: String,
-    transceiversUrl: String,
-    requestCustomSourcesPermission: (onGranted: () -> Unit, onDenied: () -> Unit) -> Unit,
+    satelliteUrls: List<String>,
+    transceiversUrls: List<String>,
     onImportTle: () -> Unit,
     onImportTransceivers: () -> Unit,
     onDismiss: () -> Unit,
-    onSave: (Boolean, Boolean, String, String) -> Unit
+    onSave: (List<String>, List<String>) -> Unit
 ) {
     val padding = LocalSpacing.current.large
-    val isEnabledCustomTle = rememberSaveable { mutableStateOf(useCustomTle) }
-    val isEnabledCustomTransceivers = rememberSaveable { mutableStateOf(useCustomTransceivers) }
-    val urlTle = rememberSaveable { mutableStateOf(tleUrl) }
-    val urlTransceivers = rememberSaveable { mutableStateOf(transceiversUrl) }
+    // Stable Long IDs avoid key collisions when several entries are empty or duplicated.
+    val nextId = remember { mutableLongStateOf((satelliteUrls.size + transceiversUrls.size).toLong()) }
+    val satUrls = remember {
+        satelliteUrls.mapIndexed { i, url -> i.toLong() to url }.toMutableStateList()
+    }
+    val txUrls = remember {
+        transceiversUrls.mapIndexed { i, url -> (satelliteUrls.size + i).toLong() to url }.toMutableStateList()
+    }
     val onAccept = {
-        onSave(isEnabledCustomTle.value, isEnabledCustomTransceivers.value, urlTle.value, urlTransceivers.value)
+        onSave(
+            satUrls.map { it.second.trim() }.filter { it.isNotBlank() },
+            txUrls.map { it.second.trim() }.filter { it.isNotBlank() }
+        )
         onDismiss()
     }
-    val onCancel = { onDismiss() }
     SharedDialog(
         title = stringResource(id = R.string.prefs_data_sources_title),
-        onCancel = onCancel,
+        onCancel = onDismiss,
         onAccept = onAccept,
     ) {
-        Column(modifier = Modifier.padding(horizontal = padding)) {
-            Row(horizontalArrangement = Arrangement.spacedBy(6.dp)) {
-                CardButton(
-                    onClick = {
-                        onImportTle()
-                        onDismiss()
-                    },
-                    text = "TLE/3LE (.txt)\nOMM (.csv)",
-                    modifier = Modifier.weight(1f)
-                )
-                CardButton(
-                    onClick = {
-                        onImportTransceivers()
-                        onDismiss()
-                    },
-                    text = "Transceivers\nSatNOGS (.json)",
-                    modifier = Modifier.weight(1f)
-                )
+        LazyColumn(
+            modifier = Modifier
+                .fillMaxHeight(0.84f)
+                .padding(horizontal = padding),
+            verticalArrangement = Arrangement.spacedBy(4.dp),
+            contentPadding = PaddingValues(vertical = 6.dp)
+        ) {
+            item {
+                Row(
+                    horizontalArrangement = Arrangement.spacedBy(6.dp),
+                    modifier = Modifier.fillMaxWidth()
+                ) {
+                    CardButton(
+                        onClick = { onImportTle(); onDismiss() },
+                        text = "TLE/3LE (.txt)\nOMM (.csv)",
+                        modifier = Modifier.weight(1f)
+                    )
+                    CardButton(
+                        onClick = { onImportTransceivers(); onDismiss() },
+                        text = "Transceivers\nSatNOGS (.json)",
+                        modifier = Modifier.weight(1f)
+                    )
+                }
             }
-            Spacer(modifier = Modifier.height(6.dp))
-            Row(
-                horizontalArrangement = Arrangement.SpaceBetween,
-                verticalAlignment = Alignment.CenterVertically,
-                modifier = Modifier.fillMaxWidth()
-            ) {
-                Text(text = stringResource(id = R.string.prefs_data_sources_tle_switch))
-                Switch(
-                    checked = isEnabledCustomTle.value,
-                    onCheckedChange = { enabled ->
-                        if (!enabled) {
-                            isEnabledCustomTle.value = false
-                        } else {
-                            requestCustomSourcesPermission(
-                                { isEnabledCustomTle.value = true },
-                                { isEnabledCustomTle.value = false }
-                            )
-                        }
-                    }
-                )
-            }
-            OutlinedTextField(
-                value = urlTle.value,
-                onValueChange = { urlTle.value = it },
-                label = { Text(text = stringResource(id = R.string.prefs_data_sources_url_title)) },
-                singleLine = true,
-                modifier = Modifier.fillMaxWidth(),
-                enabled = isEnabledCustomTle.value,
+            sourceSection(
+                sectionKey = "sat",
+                labelResId = R.string.prefs_data_sources_satellites_label,
+                urls = satUrls,
+                onAdd = { satUrls.add(nextId.longValue++ to "") },
+                onMoveUp = { i -> if (i > 0) satUrls.add(i - 1, satUrls.removeAt(i)) },
+                onRemove = { i -> satUrls.removeAt(i) },
+                onUrlChange = { i, v -> satUrls[i] = satUrls[i].first to v }
             )
-            Spacer(modifier = Modifier.height(6.dp))
-            Row(
-                horizontalArrangement = Arrangement.SpaceBetween,
-                verticalAlignment = Alignment.CenterVertically,
-                modifier = Modifier.fillMaxWidth()
-            ) {
-                Text(text = stringResource(id = R.string.prefs_data_sources_transceivers_switch))
-                Switch(
-                    checked = isEnabledCustomTransceivers.value,
-                    onCheckedChange = { enabled ->
-                        if (!enabled) {
-                            isEnabledCustomTransceivers.value = false
-                        } else {
-                            requestCustomSourcesPermission(
-                                { isEnabledCustomTransceivers.value = true },
-                                { isEnabledCustomTransceivers.value = false }
-                            )
-                        }
-                    }
-                )
-            }
-            OutlinedTextField(
-                value = urlTransceivers.value,
-                onValueChange = { urlTransceivers.value = it },
-                label = { Text(text = stringResource(id = R.string.prefs_data_sources_url_title)) },
-                singleLine = true,
-                modifier = Modifier.fillMaxWidth(),
-                enabled = isEnabledCustomTransceivers.value,
+            sourceSection(
+                sectionKey = "tx",
+                labelResId = R.string.prefs_data_sources_transceivers_label,
+                urls = txUrls,
+                onAdd = { txUrls.add(nextId.longValue++ to "") },
+                onMoveUp = { i -> if (i > 0) txUrls.add(i - 1, txUrls.removeAt(i)) },
+                onRemove = { i -> txUrls.removeAt(i) },
+                onUrlChange = { i, v -> txUrls[i] = txUrls[i].first to v }
             )
-            Spacer(modifier = Modifier.height(12.dp))
         }
     }
 }
 
+private fun LazyListScope.sourceSection(
+    sectionKey: String,
+    labelResId: Int,
+    urls: List<Pair<Long, String>>,
+    onAdd: () -> Unit,
+    onMoveUp: (Int) -> Unit,
+    onRemove: (Int) -> Unit,
+    onUrlChange: (Int, String) -> Unit
+) {
+    item {
+        Spacer(modifier = Modifier.height(6.dp))
+        Row(verticalAlignment = Alignment.CenterVertically, modifier = Modifier.fillMaxWidth()) {
+            Text(
+                text = stringResource(labelResId),
+                fontWeight = FontWeight.Medium,
+                color = MaterialTheme.colorScheme.primary,
+                modifier = Modifier.weight(1f)
+            )
+            IconCard(action = onAdd, resId = R.drawable.ic_add)
+        }
+    }
+    itemsIndexed(urls, key = { _, entry -> "$sectionKey-${entry.first}" }) { index, (_, url) ->
+        val enabledTint = MaterialTheme.colorScheme.onSurfaceVariant
+        OutlinedTextField(
+            value = url,
+            onValueChange = { onUrlChange(index, it) },
+            label = { Text(stringResource(R.string.prefs_data_sources_url_title)) },
+            leadingIcon = {
+                IconButton(onClick = { onMoveUp(index) }, enabled = index > 0) {
+                    Icon(
+                        painter = painterResource(R.drawable.ic_arrow),
+                        contentDescription = null,
+                        tint = if (index > 0) enabledTint else enabledTint.copy(alpha = 0.32f),
+                        modifier = Modifier.rotate(270f)
+                    )
+                }
+            },
+            trailingIcon = {
+                IconButton(onClick = { onRemove(index) }) {
+                    Icon(
+                        painter = painterResource(R.drawable.ic_delete),
+                        contentDescription = null
+                    )
+                }
+            },
+            singleLine = true,
+            modifier = Modifier
+                .fillMaxWidth()
+                .animateItem(fadeInSpec = spring(), fadeOutSpec = spring())
+        )
+    }
+}
+
 @Preview(showBackground = true)
 @Composable
 fun PreviewNetworkOutputDialog() {
@@ -252,6 +289,7 @@ fun PreviewNetworkOutputDialog() {
                 frequencyAddress = "127.0.0.1",
                 frequencyPort = "4532",
                 frequencyFormat = $$"F $FREQ",
+                frequencyOffsetHz = 0L,
                 bluetoothRotatorState = false,
                 bluetoothRotatorFormat = $$"P $AZ $EL",
                 bluetoothRotatorName = "Default",
@@ -261,7 +299,7 @@ fun PreviewNetworkOutputDialog() {
                 bluetoothFrequencyFormat = $$"F $FREQ"
             ),
             onDismiss = {},
-            onSave = { _, _, _, _, _, _, _, _ -> }
+            onSave = { _, _, _, _, _, _, _, _, _ -> }
         )
     }
 }
@@ -272,7 +310,7 @@ fun NetworkOutputDialog(
     onDismiss: () -> Unit,
     onSave: (
         Boolean, String, String, String,
-        Boolean, String, String, String
+        Boolean, String, String, String, Long
     ) -> Unit
 ) {
     val padding = LocalSpacing.current.large
@@ -286,12 +324,15 @@ fun NetworkOutputDialog(
         mutableStateOf("${initialSettings.frequencyAddress}:${initialSettings.frequencyPort}")
     }
     val frequencyFormat = rememberSaveable { mutableStateOf(initialSettings.frequencyFormat) }
+    val frequencyOffsetHz = rememberSaveable { mutableStateOf(initialSettings.frequencyOffsetHz.toString()) }
     val onAccept = {
         val (rotIp, rotPort) = splitAddress(rotatorAddress.value)
         val (freqIp, freqPort) = splitAddress(frequencyAddress.value)
+        val offsetHz = (frequencyOffsetHz.value.trim().toLongOrNull() ?: 0L)
+            .coerceIn(Constants.FREQ_OFFSET_MIN_HZ, Constants.FREQ_OFFSET_MAX_HZ)
         onSave(
             rotatorState.value, rotIp, rotPort, rotatorFormat.value,
-            frequencyState.value, freqIp, freqPort, frequencyFormat.value
+            frequencyState.value, freqIp, freqPort, frequencyFormat.value, offsetHz
         )
         onDismiss()
     }
@@ -324,6 +365,24 @@ fun NetworkOutputDialog(
                 onFormatChange = { frequencyFormat.value = it },
                 formatLabel = stringResource(R.string.prefs_net_frequency_format_hint)
             )
+            Spacer(modifier = Modifier.height(6.dp))
+            OutlinedTextField(
+                value = frequencyOffsetHz.value,
+                onValueChange = { frequencyOffsetHz.value = it },
+                singleLine = true,
+                label = { Text(stringResource(R.string.prefs_net_frequency_offset_hint)) },
+                supportingText = { Text(stringResource(R.string.prefs_net_frequency_offset_help)) },
+                trailingIcon = {
+                    IconButton(
+                        onClick = { frequencyOffsetHz.value = "0" },
+                        enabled = frequencyState.value && frequencyOffsetHz.value != "0"
+                    ) {
+                        Icon(painter = painterResource(R.drawable.ic_close), contentDescription = null)
+                    }
+                },
+                modifier = Modifier.fillMaxWidth(),
+                enabled = frequencyState.value
+            )
             Spacer(modifier = Modifier.height(12.dp))
         }
     }
@@ -352,6 +411,7 @@ fun PreviewBluetoothOutputDialog() {
                 frequencyAddress = "127.0.0.1",
                 frequencyPort = "4532",
                 frequencyFormat = $$"F $FREQ",
+                frequencyOffsetHz = 0L,
                 bluetoothRotatorState = false,
                 bluetoothRotatorFormat = $$"P $AZ $EL",
                 bluetoothRotatorName = "Default",

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

@@ -61,6 +61,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
+import com.rtbishop.look4sat.core.domain.model.DataSourcesSettings
 import com.rtbishop.look4sat.core.domain.model.OtherSettings
 import com.rtbishop.look4sat.core.domain.predict.GeoPos
 import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
@@ -125,30 +126,15 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
     }
     if (dialogs.dataSources) {
         DataSourcesDialog(
-            useCustomTle = uiState.dataSourcesSettings.useCustomTLE,
-            useCustomTransceivers = uiState.dataSourcesSettings.useCustomTransceivers,
-            tleUrl = uiState.dataSourcesSettings.tleUrl,
-            transceiversUrl = uiState.dataSourcesSettings.transceiversUrl,
-            requestCustomSourcesPermission = { onGranted, onDenied ->
-                pendingCustomSourcesGrant.value = onGranted
-                pendingCustomSourcesDeny.value = onDenied
-                permissions.launchCustomSourcesPermission()
-            },
+            satelliteUrls = uiState.dataSourcesSettings.satelliteUrls,
+            transceiversUrls = uiState.dataSourcesSettings.transceiversUrls,
             onImportTle = { permissions.launchTleImport(); dialogs.dataSources = false },
             onImportTransceivers = { permissions.launchTransceiverImport(); dialogs.dataSources = false },
             onDismiss = { dialogs.dataSources = false },
-            onSave = { useCustomTle, useCustomTransceivers, tleUrl, transceiversUrl ->
-                val current = uiState.dataSourcesSettings
-                val newSettings = current.copy(
-                    useCustomTLE = if (!useCustomTle || tleUrl.isNotBlank()) useCustomTle else current.useCustomTLE,
-                    tleUrl = if (!useCustomTle || tleUrl.isNotBlank()) tleUrl else current.tleUrl,
-                    useCustomTransceivers = if (!useCustomTransceivers || transceiversUrl.isNotBlank()) useCustomTransceivers else current.useCustomTransceivers,
-                    transceiversUrl = if (!useCustomTransceivers || transceiversUrl.isNotBlank()) transceiversUrl else current.transceiversUrl
-                )
-                if (newSettings != current) onAction(SettingsAction.UpdateDataSources(newSettings))
-                if (newSettings.useCustomTLE || newSettings.useCustomTransceivers) {
-                    onAction(SettingsAction.UpdateFromWeb)
-                }
+            onSave = { satUrls, txUrls ->
+                val newSettings = DataSourcesSettings(satelliteUrls = satUrls, transceiversUrls = txUrls)
+                if (newSettings != uiState.dataSourcesSettings) onAction(SettingsAction.UpdateDataSources(newSettings))
+                onAction(SettingsAction.UpdateFromWeb)
             }
         )
     }
@@ -156,14 +142,15 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
         NetworkOutputDialog(
             initialSettings = uiState.rcSettings,
             onDismiss = { dialogs.network = false },
-            onSave = { rotState, rotAddr, rotPort, rotFmt, freqState, freqAddr, freqPort, freqFmt ->
+            onSave = { rotState, rotAddr, rotPort, rotFmt, freqState, freqAddr, freqPort, freqFmt, freqOffsetHz ->
                 onAction(
                     SettingsAction.UpdateRC(
                         uiState.rcSettings.copy(
                             rotatorState = rotState, rotatorAddress = rotAddr,
                             rotatorPort = rotPort, rotatorFormat = rotFmt,
                             frequencyState = freqState, frequencyAddress = freqAddr,
-                            frequencyPort = freqPort, frequencyFormat = freqFmt
+                            frequencyPort = freqPort, frequencyFormat = freqFmt,
+                            frequencyOffsetHz = freqOffsetHz
                         )
                     )
                 )

feature/status/build.gradle.kts

@@ -0,0 +1,17 @@
+import com.android.build.api.dsl.LibraryExtension
+
+plugins {
+    alias(libs.plugins.convention.featurePlugin)
+}
+
+android {
+    namespace = "com.rtbishop.look4sat.feature.status"
+    compileOptions {
+        encoding = "UTF-8"
+    }
+}
+
+dependencies {
+    implementation(project(":core:domain"))
+    implementation(project(":core:presentation"))
+}

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

@@ -0,0 +1,327 @@
+package com.rtbishop.look4sat.feature.status
+
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+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.FlowRow
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+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.items
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.ColorFilter
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+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.InfoDialog
+import com.rtbishop.look4sat.core.presentation.R
+import com.rtbishop.look4sat.core.presentation.layoutPadding
+import java.util.Calendar
+
+/** Fixed width per day tile — tablet-safe; name column absorbs remaining space. */
+private val TILE_WIDTH: Dp = 64.dp
+
+/**
+ * Map AMSAT status text to Material3 colorScheme colors.
+ * Addresses PR #233 review: use colorScheme instead of hardcoded Color() constants.
+ */
+@Composable
+private fun statusColorOf(statusText: String): Color {
+    return when {
+        statusText.contains("Heard", ignoreCase = true) && !statusText.contains("Not", ignoreCase = true) ->
+            MaterialTheme.colorScheme.tertiary
+        statusText.contains("Telemetry", ignoreCase = true) || statusText.contains("Beacon", ignoreCase = true) ->
+            MaterialTheme.colorScheme.tertiaryContainer
+        statusText.contains("Not Heard", ignoreCase = true) ->
+            Color(0xFFDC267F)
+        else ->
+            MaterialTheme.colorScheme.error
+    }
+}
+
+@Composable
+fun SatStatusDestination() {
+    val context = LocalContext.current
+    val container = (context.applicationContext as IContainerProvider).getMainContainer()
+    val viewModel: SatStatusViewModel = viewModel(factory = SatStatusViewModel.factory(container))
+    val uiState by viewModel.uiState.collectAsStateWithLifecycle()
+    SatStatusScreen(uiState) { viewModel.refresh() }
+}
+
+@Composable
+private fun SatStatusScreen(uiState: SatStatusUiState, refresh: () -> Unit) {
+    var selectedDay by remember { mutableStateOf<Pair<SatStatus, SatDay>?>(null) }
+    Column(modifier = Modifier.fillMaxSize().layoutPadding()) {
+        StatusHeader(fetchedAtUtcMs = uiState.fetchedAtUtcMs, isRefreshing = uiState.isRefreshing, onRefresh = refresh)
+        LegendRow()
+
+        when {
+            uiState.isLoading -> {
+                Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                    CircularProgressIndicator()
+                }
+            }
+            uiState.error != null && uiState.statuses.isEmpty() -> {
+                Column(
+                    modifier = Modifier.fillMaxSize(),
+                    verticalArrangement = Arrangement.Center,
+                    horizontalAlignment = Alignment.CenterHorizontally
+                ) {
+                    Text(text = stringResource(id = R.string.amsat_load_failed), color = MaterialTheme.colorScheme.error)
+                    TextButton(onClick = refresh) { Text(text = stringResource(id = R.string.amsat_retry)) }
+                }
+            }
+            else -> {
+                HeaderRow(statuses = uiState.statuses)
+                HorizontalDivider(thickness = 1.dp)
+                LazyColumn(modifier = Modifier.fillMaxSize()) {
+                    items(uiState.statuses, key = { it.name }) { status ->
+                        StatusRow(status = status, onClickDay = { day -> selectedDay = status to day })
+                    }
+                }
+            }
+        }
+    }
+
+    selectedDay?.let { (status, day) ->
+        ReportDialog(statusName = status.name, day = day, reports = uiState.reports, onDismiss = { selectedDay = null })
+    }
+}
+
+/** Top: update time + refresh button (spinner while loading) */
+@Composable
+private fun StatusHeader(fetchedAtUtcMs: Long, isRefreshing: Boolean, onRefresh: () -> Unit) {
+    Row(
+        modifier = Modifier.fillMaxWidth().padding(vertical = 4.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Text(
+            text = if (fetchedAtUtcMs > 0)
+                stringResource(id = R.string.amsat_updated) + " " + formatFetchedAt(fetchedAtUtcMs)
+            else
+                stringResource(id = R.string.amsat_title),
+            fontSize = 14.sp,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.weight(1f)
+        )
+        Box(
+            modifier = Modifier
+                .size(32.dp)
+                .clip(CircleShape)
+                .background(MaterialTheme.colorScheme.surfaceVariant)
+                .clickable(onClick = onRefresh),
+            contentAlignment = Alignment.Center
+        ) {
+            if (isRefreshing) {
+                CircularProgressIndicator(modifier = Modifier.size(16.dp), strokeWidth = 2.dp)
+            } else {
+                Image(
+                    painter = painterResource(id = R.drawable.ic_refresh),
+                    contentDescription = stringResource(id = R.string.amsat_refresh),
+                    modifier = Modifier.size(16.dp),
+                    colorFilter = ColorFilter.tint(MaterialTheme.colorScheme.primary)
+                )
+            }
+        }
+    }
+}
+
+/** Legend: FlowRow of colored chips — wraps to two lines on narrow screens, stays one line when wide. */
+@Composable
+private fun LegendRow() {
+    val legend = listOf(
+        stringResource(id = R.string.amsat_active) to Color(0xFF648FFF),
+        stringResource(id = R.string.amsat_tlm) to Color(0xFFFFB000),
+        stringResource(id = R.string.amsat_not_heard) to Color(0xFFDC267F),
+        stringResource(id = R.string.amsat_conflict) to Color(0xFFFE6100)
+    )
+    FlowRow(
+        modifier = Modifier.fillMaxWidth().padding(bottom = 6.dp),
+        horizontalArrangement = Arrangement.spacedBy(6.dp),
+        verticalArrangement = Arrangement.spacedBy(6.dp)
+    ) {
+        legend.forEach { (label, color) ->
+            val alphaColor = color.copy(alpha = 0.25f)
+            Row(
+                modifier = Modifier
+                    .clip(RoundedCornerShape(32.dp))
+                    .background(alphaColor)
+                    .padding(horizontal = 12.dp, vertical = 4.dp),
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                Box(
+                    modifier = Modifier
+                        .size(8.dp)
+                        .clip(RoundedCornerShape(4.dp))
+                        .background(color)
+                )
+                Spacer(modifier = Modifier.width(6.dp))
+                Text(
+                    text = label,
+                    fontSize = 14.sp,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+        }
+    }
+}
+
+/** Header: satellite name column + fixed-width date labels aligned to tiles. */
+@Composable
+private fun HeaderRow(statuses: List<SatStatus>) {
+    val dates = statuses.firstOrNull()?.days?.map { it.dateLabel } ?: emptyList()
+    Row(
+        modifier = Modifier.fillMaxWidth().padding(vertical = 2.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Text(
+            text = stringResource(id = R.string.amsat_name),
+            fontSize = 12.sp,
+            fontWeight = FontWeight.Medium,
+            color = MaterialTheme.colorScheme.primary,
+            modifier = Modifier.weight(1f).padding(start = 4.dp)
+        )
+        dates.forEach { date ->
+            Text(
+                text = date,
+                fontSize = 12.sp,
+                fontWeight = FontWeight.Medium,
+                textAlign = TextAlign.Center,
+                color = MaterialTheme.colorScheme.primary,
+                modifier = Modifier.width(TILE_WIDTH)
+            )
+        }
+    }
+}
+
+/** 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
+    ) {
+        Text(
+            text = status.name,
+            fontSize = 14.sp,
+            maxLines = 1,
+            overflow = TextOverflow.Ellipsis,
+            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,
+                modifier = Modifier.width(TILE_WIDTH).padding(horizontal = 2.dp),
+                onClick = { onClickDay(day) }
+            )
+        }
+    }
+}
+
+/** Day block: newest reported status among the day's 12 slots; gray when none. */
+@Composable
+private fun DayCell(slot: SatSlot, modifier: Modifier, onClick: () -> Unit) {
+    val color = Color(slot.statusColor)
+    Box(
+        modifier = modifier
+            .height(28.dp)
+            .clip(RoundedCornerShape(4.dp))
+            .background(color)
+            .clickable(onClick = onClick),
+        contentAlignment = Alignment.Center
+    ) {
+        if (slot.count > 0) {
+            Text(text = slot.count.toString(), fontSize = 13.sp, fontWeight = FontWeight.Bold, color = Color.White)
+        }
+    }
+}
+
+/** Report detail dialog (callsign / date / time / grid) */
+@Composable
+private fun ReportDialog(statusName: String, day: SatDay, reports: Map<String, SatReport>, onDismiss: () -> Unit) {
+    val dayReports = day.slots.flatMap { it.reportIds }.mapNotNull { reports[it] }
+    InfoDialog(title = "$statusName · ${day.dateLabel}", onDismiss = onDismiss, onAccept = onDismiss) {
+        if (dayReports.isEmpty()) {
+            Text(stringResource(id = R.string.amsat_no_reports))
+            Spacer(modifier = Modifier.height(8.dp))
+        } else {
+            LazyColumn(modifier = Modifier.heightIn(max = 480.dp)) {
+                items(dayReports) { report ->
+                    Column(modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 8.dp)) {
+                        Row(verticalAlignment = Alignment.CenterVertically) {
+                            Box(
+                                modifier = Modifier
+                                    .size(8.dp)
+                                    .clip(CircleShape)
+                                    .background(statusColorOf(report.statusText))
+                            )
+                            Spacer(modifier = Modifier.width(6.dp))
+                            Text(text = report.statusText, fontSize = 14.sp, fontWeight = FontWeight.Bold)
+                        }
+                        Text(
+                            text = "${report.call}  ${report.dateUtc}  ${report.timeUtc}" +
+                                if (report.grid.isNotBlank() && report.grid != "-") "  ${report.grid}" else "",
+                            fontSize = 14.sp,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                    HorizontalDivider(thickness = 0.5.dp)
+                }
+            }
+        }
+    }
+}
+
+private val MONTH_ABBR = arrayOf("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec")
+
+private fun formatFetchedAt(utcMs: Long): String {
+    val cal = Calendar.getInstance()
+    cal.timeInMillis = utcMs
+    val day = cal.get(Calendar.DAY_OF_MONTH)
+    val month = MONTH_ABBR[cal.get(Calendar.MONTH)]
+    val year = cal.get(Calendar.YEAR)
+    val hh = cal.get(Calendar.HOUR_OF_DAY).toString().padStart(2, '0')
+    val mm = cal.get(Calendar.MINUTE).toString().padStart(2, '0')
+    val ss = cal.get(Calendar.SECOND).toString().padStart(2, '0')
+    return "$day$month $year - $hh:$mm:$ss"
+}

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

@@ -0,0 +1,95 @@
+package com.rtbishop.look4sat.feature.status
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.lifecycle.viewmodel.initializer
+import androidx.lifecycle.viewmodel.viewModelFactory
+import com.rtbishop.look4sat.core.domain.model.SatReport
+import com.rtbishop.look4sat.core.domain.model.SatStatus
+import com.rtbishop.look4sat.core.domain.repository.IAmSatRepository
+import com.rtbishop.look4sat.core.domain.repository.IMainContainer
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+
+data class SatStatusUiState(
+    val isLoading: Boolean = false,
+    val isRefreshing: Boolean = false,
+    val statuses: List<SatStatus> = emptyList(),
+    val reports: Map<String, SatReport> = emptyMap(),
+    val fetchedAtUtcMs: Long = 0L,
+    val error: String? = null
+)
+
+class SatStatusViewModel(
+    private val amSatRepo: IAmSatRepository
+) : ViewModel() {
+
+    private val _uiState = MutableStateFlow(SatStatusUiState(isLoading = true))
+    val uiState: StateFlow<SatStatusUiState> = _uiState
+
+    init {
+        fetch()
+    }
+
+    fun fetch() {
+        viewModelScope.launch {
+            _uiState.update { it.copy(isLoading = true, error = null) }
+            try {
+                val page = amSatRepo.fetchStatus()
+                if (page != null && page.statuses.isNotEmpty()) {
+                    _uiState.update {
+                        it.copy(
+                            isLoading = false,
+                            isRefreshing = false,
+                            statuses = page.statuses,
+                            reports = page.reports,
+                            fetchedAtUtcMs = page.fetchedAtUtcMs
+                        )
+                    }
+                } else {
+                    _uiState.update {
+                        it.copy(isLoading = false, isRefreshing = false, error = "fetch_failed")
+                    }
+                }
+            } catch (exception: Exception) {
+                _uiState.update {
+                    it.copy(isLoading = false, isRefreshing = false, error = exception.message ?: "fetch_failed")
+                }
+            }
+        }
+    }
+
+    fun refresh() {
+        if (_uiState.value.isRefreshing) return
+        _uiState.update { it.copy(isRefreshing = true, error = null) }
+        viewModelScope.launch {
+            try {
+                val page = amSatRepo.fetchStatus()
+                if (page != null && page.statuses.isNotEmpty()) {
+                    _uiState.update {
+                        it.copy(
+                            isRefreshing = false,
+                            statuses = page.statuses,
+                            reports = page.reports,
+                            fetchedAtUtcMs = page.fetchedAtUtcMs
+                        )
+                    }
+                } else {
+                    _uiState.update { it.copy(isRefreshing = false, error = "fetch_failed") }
+                }
+            } catch (exception: Exception) {
+                _uiState.update { it.copy(isRefreshing = false, error = exception.message ?: "fetch_failed") }
+            }
+        }
+    }
+
+    companion object {
+        fun factory(container: IMainContainer) = viewModelFactory {
+            initializer {
+                SatStatusViewModel(container.amSatRepo)
+            }
+        }
+    }
+}

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 #noinspection UnusedVersionCatalogEntry
-appVersionCode = "443"
+appVersionCode = "446"
 #noinspection UnusedVersionCatalogEntry
-appVersionName = "4.4.3"
+appVersionName = "4.4.6-ba7opf.1"
 #noinspection UnusedVersionCatalogEntry
 compileSdk = "37"
 #noinspection UnusedVersionCatalogEntry
@@ -23,7 +23,7 @@ compose-activity = "1.13.0"
 compose-lifecycle = "2.11.0"
 compose-navigation3 = "1.1.5"
 
-google-ksp = "2.3.8"
+google-ksp = "2.3.10"
 
 kotlin = "2.4.10"
 kotlin-coroutines = "1.11.0"

settings.gradle.kts

@@ -27,5 +27,6 @@ include(
     ":feature:passes",
     ":feature:radar",
     ":feature:satellites",
-    ":feature:settings"
+    ":feature:settings",
+    ":feature:status"
 )