chore: bump version to 4.4.7-ba7opf.2 (versionCode 472)

Android plurals have no 'one' category in Chinese (zh plural rules only
contain 'other'), so a single QSO rendered as '1 QSOs' on Chinese-locale
devices. Replace the plurals resource with explicit singular/plural
strings selected in code.

core/data/src/main/java/com/rtbishop/look4sat/core/data/database/Look4SatDao.kt

@@ -60,4 +60,7 @@ interface Look4SatDao {
 
     @Query("DELETE FROM radios")
     suspend fun deleteRadios()
+
+    @Query("DELETE FROM radios WHERE isCustom = 0")
+    suspend fun deleteManagedRadios()
 }

core/data/src/main/java/com/rtbishop/look4sat/core/data/database/Look4SatDb.kt

@@ -19,19 +19,21 @@ package com.rtbishop.look4sat.core.data.database
 
 import androidx.room.Database
 import androidx.room.RoomDatabase
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
 import com.rtbishop.look4sat.core.data.database.entity.SatEntry
 import com.rtbishop.look4sat.core.data.database.entity.SatRadio
 
-@Database(entities = [SatEntry::class, SatRadio::class], version = 1, exportSchema = false)
+@Database(entities = [SatEntry::class, SatRadio::class], version = 2, exportSchema = false)
 abstract class Look4SatDb : RoomDatabase() {
     abstract fun look4SatDao(): Look4SatDao
 }
 
-//val MIGRATION_1_2 = object : Migration(1, 2) {
-//    override fun migrate(database: SupportSQLiteDatabase) {
-//        database.execSQL("CREATE TABLE entries_backup (name TEXT NOT NULL, epoch REAL NOT NULL, meanmo REAL NOT NULL, eccn REAL NOT NULL, incl REAL NOT NULL, raan REAL NOT NULL, argper REAL NOT NULL, meanan REAL NOT NULL, catnum INTEGER NOT NULL, bstar REAL NOT NULL, xincl REAL NOT NULL, xnodeo REAL NOT NULL, omegao REAL NOT NULL, xmo REAL NOT NULL, xno REAL NOT NULL, orbitalPeriod REAL NOT NULL, isDeepSpace INTEGER NOT NULL, comment TEXT, PRIMARY KEY(catnum))")
-//        database.execSQL("INSERT INTO entries_backup (name, epoch, meanmo, eccn, incl, raan, argper, meanan, catnum, bstar, xincl, xnodeo, omegao, xmo, xno, orbitalPeriod, isDeepSpace, comment) SELECT name, epoch, meanmo, eccn, incl, raan, argper, meanan, catnum, bstar, xincl, xnodeo, omegao, xmo, xno, 1440 / meanmo, 1440 / meanmo >= 225.0, comment FROM entries")
-//        database.execSQL("DROP TABLE entries")
-//        database.execSQL("ALTER TABLE entries_backup RENAME TO entries")
-//    }
-//}
+/** Adds the mean motion derivative, needed to tell decayed satellites apart, and marks the
+ * transceivers that were imported from a file, so that remote updates leave them alone. */
+val MIGRATION_1_2 = object : Migration(1, 2) {
+    override fun migrate(db: SupportSQLiteDatabase) {
+        db.execSQL("ALTER TABLE entries ADD COLUMN ndot REAL NOT NULL DEFAULT 0.0")
+        db.execSQL("ALTER TABLE radios ADD COLUMN isCustom INTEGER NOT NULL DEFAULT 0")
+    }
+}

core/data/src/main/java/com/rtbishop/look4sat/core/data/database/entity/SatEntry.kt

@@ -30,5 +30,6 @@ data class SatEntry(
     val argper: Double,
     val meanan: Double,
     val catnum: Int,
-    val bstar: Double
+    val bstar: Double,
+    val ndot: Double = 0.0
 )

core/data/src/main/java/com/rtbishop/look4sat/core/data/database/entity/SatRadio.kt

@@ -32,5 +32,7 @@ data class SatRadio(
     val uplinkHigh: Long?,
     val uplinkMode: String?,
     val isInverted: Boolean,
-    val catnum: Int?
+    val catnum: Int?,
+    /** Set for manually imported transceivers, which remote updates must not replace. */
+    val isCustom: Boolean = false
 )

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

@@ -24,6 +24,7 @@ import android.hardware.display.DisplayManager
 import android.location.LocationManager
 import androidx.room.Room
 import com.rtbishop.look4sat.core.data.database.Look4SatDb
+import com.rtbishop.look4sat.core.data.database.MIGRATION_1_2
 import com.rtbishop.look4sat.core.data.framework.BluetoothReporter
 import com.rtbishop.look4sat.core.data.framework.Ft817Controller
 import com.rtbishop.look4sat.core.data.framework.Ic705Controller
@@ -167,7 +168,10 @@ class MainContainer(private val context: Context) : IMainContainer {
 
     private fun provideLocalSource(): ILocalSource {
         val builder = Room.databaseBuilder(context, Look4SatDb::class.java, "Look4SatDBv400")
-        val database = builder.fallbackToDestructiveMigration(false).build()
+        val database = builder
+            .addMigrations(MIGRATION_1_2)
+            .fallbackToDestructiveMigration(false)
+            .build()
         return LocalSource(database.look4SatDao())
     }
 

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

@@ -58,7 +58,7 @@ class DatabaseRepo(
         var importedCount = 0
         remoteSource.getFileStream(uri)?.let { stream ->
             val transceivers = dataParser.parseJSONStream(unwrapIfZipped(uri, stream))
-            localSource.insertRadios(transceivers)
+            localSource.insertRadios(transceivers, isCustom = true)
             importedCount = transceivers.size
         }
         setUpdateSuccessful(System.currentTimeMillis())
@@ -105,9 +105,16 @@ class DatabaseRepo(
             val normUrl = normalizeUrl(rawUrl)
             result.stream?.let { dataParser.parseJSONStream(unwrapIfZipped(normUrl, it)) }.orEmpty()
         }.filter { it.uuid.isNotBlank() }.distinctBy { it.uuid }
-        // insert parsed data into the database
-        localSource.insertEntries(importedEntries)
-        localSource.insertRadios(importedRadios)
+        // insert parsed data into the database.
+        // Transceivers are a full snapshot: sources publish active entries only, so a retired
+        // transceiver simply disappears from the feed and has to be dropped locally as well.
+        // Manually imported ones (isCustom) are kept: no source can refresh them, so nothing
+        // would bring them back if they were replaced here.
+        if (importedRadios.isNotEmpty()) {
+            localSource.deleteManagedRadios()
+            localSource.insertRadios(importedRadios)
+        }
+        if (importedEntries.isNotEmpty()) localSource.insertEntries(importedEntries)
         setUpdateSuccessful(System.currentTimeMillis())
     }
 

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

@@ -169,6 +169,7 @@ class LoTWRepository : ILoTWRepository {
         var country: String? = null
         var cqz: Int? = null
         var state: String? = null
+        var myGrid: String? = null
         val gridsInRecord = mutableListOf<String>()
 
         fun emitRecord() {
@@ -177,7 +178,8 @@ class LoTWRepository : ILoTWRepository {
             val qso = com.rtbishop.look4sat.core.domain.model.GridQso(
                 call = call, epochMs = epochMs, satName = satName,
                 mode = mode, bandUp = bandUp, bandDown = bandDown,
-                dxcc = dxcc, country = country, cqz = cqz, state = state
+                dxcc = dxcc, country = country, cqz = cqz, state = state,
+                myGrid = myGrid
             )
             for (grid in gridsInRecord) {
                 result.getOrPut(grid) { mutableListOf() }.add(qso)
@@ -188,6 +190,7 @@ class LoTWRepository : ILoTWRepository {
             propMode = null; call = ""; qsoDate = ""; timeOn = ""
             satName = ""; mode = ""; bandUp = ""; bandDown = ""
             dxcc = null; country = null; cqz = null; state = null
+            myGrid = null
             gridsInRecord.clear()
         }
 
@@ -222,6 +225,13 @@ class LoTWRepository : ILoTWRepository {
                     cqz = adifValue(line).toIntOrNull()
                 line.startsWith("<STATE:") ->
                     state = adifValue(line).trim().ifBlank { null }?.let { normalizeState(it) }
+                line.startsWith("<MY_GRIDSQUARE:") -> {
+                    // Own-station grid (must not be confused with GRIDSQUARE —
+                    // the opposite station's grid). Recorded per QSO so awards
+                    // can be counted per operated grid.
+                    val value = adifValue(line)
+                    if (value.length >= 4) myGrid = value.take(4).uppercase()
+                }
                 line.startsWith("<GRIDSQUARE:") || line.startsWith("<VUCC_GRIDS:") -> {
                     // VUCC_GRIDS holds a comma-separated list of grids
                     // ("EN52en,EN53fa"), up to four for contacts spanning

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

@@ -35,6 +35,8 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.withContext
 import java.util.TimeZone
@@ -66,8 +68,11 @@ class SatelliteRepo(
     override suspend fun initRepository() = withContext(dispatcher) {
         combine(
             settingsRepo.selectedIds,
-            settingsRepo.stationPosition
-        ) { selectedIds, _ -> selectedIds }
+            settingsRepo.stationPosition,
+            // Recalculate passes when the UTC display toggle changes, so an existing
+            // AOS time window is reapplied in the newly selected timezone.
+            settingsRepo.otherSettings.map { it.stateOfUtc }.distinctUntilChanged()
+        ) { selectedIds, _, _ -> selectedIds }
             .collect { selectedIds ->
                 _satellites.update { localStorage.getEntriesWithIds(selectedIds) }
                 val settings = settingsRepo.passesSettings.value
@@ -175,7 +180,16 @@ class SatelliteRepo(
         aosEndMinute: Int,
         invertAosTimeWindow: Boolean
     ): Boolean {
-        val offsetMillis = TimeZone.getDefault().getOffset(aosTime).toLong()
+        // Follow the UTC display toggle: with UTC enabled the window is interpreted
+        // in UTC, otherwise in the device's local timezone. Otherwise the pass list
+        // shows UTC times while the filter silently uses local time — the two
+        // disagree by the timezone offset (e.g. 8h for China).
+        val tz = if (settingsRepo.otherSettings.value.stateOfUtc) {
+            TimeZone.getTimeZone("UTC")
+        } else {
+            TimeZone.getDefault()
+        }
+        val offsetMillis = tz.getOffset(aosTime).toLong()
         val localMillis = Math.floorMod(aosTime + offsetMillis, 24L * 60L * 60L * 1000L)
         val aosMinute = (localMillis / 60_000L).toInt()
         val inRange = if (aosStartMinute <= aosEndMinute) {

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

@@ -204,7 +204,9 @@ class SettingsRepo(
                         dxcc = o.optInt("dx", 0).takeIf { it > 0 },
                         country = o.optString("cty").ifBlank { null },
                         cqz = o.optInt("cq", 0).takeIf { it > 0 },
-                        state = o.optString("st").ifBlank { null }
+                        state = o.optString("st").ifBlank { null },
+                        // Own-grid field: absent in pre-myGrid data -> null.
+                        myGrid = o.optString("mg").ifBlank { null }
                     )
                 }
                 if (list.isNotEmpty()) result[grid] = list
@@ -232,6 +234,7 @@ class SettingsRepo(
                         .put("cty", q.country ?: "")
                         .put("cq", q.cqz ?: 0)
                         .put("st", q.state ?: "")
+                        .put("mg", q.myGrid ?: "")
                 )
             }
             root.put(grid, array)

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

@@ -51,12 +51,12 @@ class LocalSource(private val look4SatDao: Look4SatDao) : ILocalSource {
 
     private fun FrameworkEntry.toDomain() = OrbitalData(
         this.name, this.epoch, this.meanmo, this.eccn, this.incl,
-        this.raan, this.argper, this.meanan, this.catnum, this.bstar
+        this.raan, this.argper, this.meanan, this.catnum, this.bstar, this.ndot
     )
 
     private fun OrbitalData.toEntity() = FrameworkEntry(
         this.name, this.epoch, this.meanmo, this.eccn, this.incl,
-        this.raan, this.argper, this.meanan, this.catnum, this.bstar
+        this.raan, this.argper, this.meanan, this.catnum, this.bstar, this.ndot
     )
 
     private fun List<OrbitalData>.toEntity() = this.map { item -> item.toEntity() }
@@ -73,20 +73,22 @@ class LocalSource(private val look4SatDao: Look4SatDao) : ILocalSource {
         return look4SatDao.getRadiosWithId(id).toDomainRadios()
     }
 
-    override suspend fun insertRadios(radios: List<SatRadio>) {
-        look4SatDao.insertRadios(radios.toFrameworkRadios())
+    override suspend fun insertRadios(radios: List<SatRadio>, isCustom: Boolean) {
+        look4SatDao.insertRadios(radios.map { it.copy(isCustom = isCustom) }.toFrameworkRadios())
     }
 
+    override suspend fun deleteManagedRadios() = look4SatDao.deleteManagedRadios()
+
     override suspend fun deleteRadios() = look4SatDao.deleteRadios()
 
     private fun DomainRadio.toFramework() = FrameworkRadio(
         this.uuid, this.info, this.isAlive, this.downlinkLow, this.downlinkHigh, this.downlinkMode,
-        this.uplinkLow, this.uplinkHigh, this.uplinkMode, this.isInverted, this.catnum
+        this.uplinkLow, this.uplinkHigh, this.uplinkMode, this.isInverted, this.catnum, this.isCustom
     )
 
     private fun FrameworkRadio.toDomain() = DomainRadio(
         this.uuid, this.info, this.isAlive, this.downlinkLow, this.downlinkHigh, this.downlinkMode,
-        this.uplinkLow, this.uplinkHigh, this.uplinkMode, this.isInverted, this.catnum
+        this.uplinkLow, this.uplinkHigh, this.uplinkMode, this.isInverted, this.catnum, this.isCustom
     )
 
     private fun List<DomainRadio>.toFrameworkRadios() = this.map { radio -> radio.toFramework() }

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

@@ -185,8 +185,12 @@ private class FakeLocalSource : ILocalSource {
 
     override suspend fun getRadiosWithId(id: Int): List<SatRadio> = emptyList()
 
-    override suspend fun insertRadios(radios: List<SatRadio>) {
-        insertedRadios += radios
+    override suspend fun insertRadios(radios: List<SatRadio>, isCustom: Boolean) {
+        insertedRadios += radios.map { it.copy(isCustom = isCustom) }
+    }
+
+    override suspend fun deleteManagedRadios() {
+        insertedRadios.removeAll { !it.isCustom }
     }
 
     override suspend fun deleteRadios() {

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

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

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

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

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

@@ -32,5 +32,7 @@ data class SatRadio(
     @SerialName("uplink_high") val uplinkHigh: Long?,
     @SerialName("uplink_mode") val uplinkMode: String?,
     @SerialName("invert") val isInverted: Boolean,
-    @SerialName("norad_cat_id") val catnum: Int?
+    @SerialName("norad_cat_id") val catnum: Int?,
+    /** Set for manually imported transceivers, which remote updates must not replace. */
+    val isCustom: Boolean = false
 )

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

@@ -31,6 +31,9 @@ interface ILocalSource {
     suspend fun getIdsWithModes(modes: List<String>): List<Int>
     suspend fun getRadiosTotal(): Int
     suspend fun getRadiosWithId(id: Int): List<SatRadio>
-    suspend fun insertRadios(radios: List<SatRadio>)
+    suspend fun insertRadios(radios: List<SatRadio>, isCustom: Boolean = false)
+
+    /** Delete all non-custom transceivers, keeping manually imported ones. */
+    suspend fun deleteManagedRadios()
     suspend fun deleteRadios()
 }

core/domain/src/test/java/com/rtbishop/look4sat/core/domain/predict/CelestialComputerTest.kt

@@ -0,0 +1,79 @@
+/*
+ * 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.predict
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import java.time.Instant
+import kotlin.math.abs
+
+class CelestialComputerTest {
+
+    private data class RiseSetCase(
+        val name: String,
+        val observer: GeoPos,
+        val startIso: String
+    )
+
+    @Test
+    fun `findSunRiseSet returns distinct sunrise and sunset for representative locations`() {
+        val cases = listOf(
+            RiseSetCase("Equator at March equinox", GeoPos(0.0, 0.0), "2026-03-20T00:00:00Z"),
+            RiseSetCase("Equator at September equinox", GeoPos(0.0, 0.0), "2026-09-23T00:00:00Z"),
+            RiseSetCase("Sydney winter", GeoPos(-33.8688, 151.2093), "2026-06-21T00:00:00Z"),
+            RiseSetCase("Buenos Aires winter", GeoPos(-34.6037, -58.3816), "2026-06-21T00:00:00Z"),
+            RiseSetCase("Cape Town winter", GeoPos(-33.9249, 18.4241), "2026-06-21T00:00:00Z"),
+            RiseSetCase("London summer", GeoPos(51.5074, -0.1278), "2026-06-21T00:00:00Z")
+        )
+
+        cases.forEach { testCase ->
+            val result = CelestialComputer.findSunRiseSet(testCase.observer, testCase.startIso.toMillis())
+            val daylightDuration = result.setTimeMillis - result.riseTimeMillis
+
+            assertTrue("${testCase.name}: sunrise should be non-zero", result.riseTimeMillis > 0L)
+            assertTrue("${testCase.name}: sunset should be non-zero", result.setTimeMillis > 0L)
+            assertTrue("${testCase.name}: sunset should be after sunrise", result.setTimeMillis > result.riseTimeMillis)
+            assertTrue("${testCase.name}: daylight duration should be longer than 1 hour", daylightDuration > HOUR_MILLIS)
+            assertTrue("${testCase.name}: daylight duration should be shorter than 24 hours", daylightDuration < DAY_MILLIS)
+
+            val riseElevation = CelestialComputer.getSunPosition(testCase.observer, result.riseTimeMillis).elevation
+            val setElevation = CelestialComputer.getSunPosition(testCase.observer, result.setTimeMillis).elevation
+            assertEquals("${testCase.name}: sunrise should converge near the standard threshold", SUNRISE_SET_THRESHOLD, riseElevation, 0.02)
+            assertEquals("${testCase.name}: sunset should converge near the standard threshold", SUNRISE_SET_THRESHOLD, setElevation, 0.02)
+        }
+    }
+
+    @Test
+    fun `findSunRiseSet does not return the same instant for equinox regression cases`() {
+        listOf("2026-03-20T00:00:00Z", "2026-09-23T00:00:00Z").forEach { startIso ->
+            val result = CelestialComputer.findSunRiseSet(GeoPos(0.0, 0.0), startIso.toMillis())
+            val separationMillis = abs(result.setTimeMillis - result.riseTimeMillis)
+
+            assertTrue("$startIso: sunrise and sunset should be separated", separationMillis > HOUR_MILLIS)
+        }
+    }
+
+    private fun String.toMillis(): Long = Instant.parse(this).toEpochMilli()
+
+    private companion object {
+        private const val SUNRISE_SET_THRESHOLD = -0.8333
+        private const val HOUR_MILLIS = 60L * 60L * 1000L
+        private const val DAY_MILLIS = 24L * HOUR_MILLIS
+    }
+}

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

@@ -122,6 +122,8 @@
     <string name="map_visibility">能见度：%s</string>
     <!-- Worked-grid QSO dialog -->
     <string name="grid_qso_calls_count">%d 个呼号 · %d 次通联</string>
+    <string name="grid_qso_count_one">%d QSO</string>
+    <string name="grid_qso_count_many">%d QSOs</string>
     <string name="grid_qso_first">首通</string>
     <string name="grid_qso_no_sat">卫星未知</string>
     <string name="map_visible">日照中</string>

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

@@ -147,6 +147,8 @@
     <string name="map_visibility">Visibility: %s</string>
     <!-- Worked-grid QSO dialog -->
     <string name="grid_qso_calls_count">%d callsigns · %d QSOs</string>
+    <string name="grid_qso_count_one">%d QSO</string>
+    <string name="grid_qso_count_many">%d QSOs</string>
     <string name="grid_qso_first">First</string>
     <string name="grid_qso_no_sat">satellite unknown</string>
     <string name="map_visible">Visible</string>

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

@@ -428,7 +428,15 @@ class MaidenheadGridOverlay : Overlay() {
 
     /** Y pixel for a latitude, or null when outside the viewport. */
     private fun projectionToY(projection: Projection, lat: Double): Float? {
-        val geo = org.osmdroid.util.GeoPoint(lat, 0.0)
+        // Web Mercator is undefined beyond ±85.0511° (osmdroid clamps the world
+        // to TileSystemWebMercator limits). Projecting the polar field rows
+        // (lat=±90: Maidenhead row R = 80..90°N, row A = -90..-80°S) yields
+        // ±9.2e18 pixel coordinates that the canvas cannot rasterize, so the
+        // polar grid lines silently vanish. Clamp to the Mercator limit: the
+        // polar rows then project onto the screen edge and their lines are
+        // drawn (the off-limit sliver beyond 85.05° is invisible anyway).
+        val clamped = lat.coerceIn(-MAX_MERCATOR_LAT, MAX_MERCATOR_LAT)
+        val geo = org.osmdroid.util.GeoPoint(clamped, 0.0)
         val p = projection.toPixels(geo, null)
         return p.y.toFloat()
     }
@@ -484,6 +492,9 @@ class MaidenheadGridOverlay : Overlay() {
         const val FIELD_LON = 20.0
         const val SUB_SQUARE_LAT = 1.0
         const val SUB_SQUARE_LON = 2.0
+        // Web Mercator latitude limit (osmdroid TileSystemWebMercator): projecting
+        // beyond it produces ±9.2e18 pixel coordinates the canvas cannot draw.
+        const val MAX_MERCATOR_LAT = 85.05112877980658
         // Zoom at which the 2°x1° sub-square grid lines/fills appear.
         // 5.0 → 6.0: at zoom 5 a full field spans too little screen width and
         // the sub-square grid is too dense to read; 6 roughly doubles the

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

@@ -21,6 +21,7 @@ import android.graphics.Canvas
 import android.graphics.Color
 import android.graphics.Paint
 import android.graphics.RectF
+import org.osmdroid.util.GeoPoint
 import org.osmdroid.views.MapView
 import org.osmdroid.views.overlay.Overlay
 import kotlin.math.cos
@@ -39,9 +40,11 @@ import kotlin.math.sin
  * exceeds 90°, i.e. the dot product of the two unit vectors is negative:
  *   dot = sin(lat)*sin(sunLat) + cos(lat)*cos(sunLat)*cos(lon - sunLon) < 0
  *
- * Performance: we sample one column per [stepPx] pixels (default 4) and draw
+ * Performance: we sample one column per stepPx pixels (default 4) and draw
  * filled vertical rectangles.  On a 1080-wide screen this means ~270 trig
- * evaluations per row, which is imperceptible.
+ * evaluations per row, which is imperceptible.  draw() is called on every
+ * frame, so it must stay allocation-free — all fromPixels() calls reuse a
+ * single GeoPoint instance.
  */
 class MapNightOverlay : Overlay() {
 
@@ -58,6 +61,9 @@ class MapNightOverlay : Overlay() {
 
     private val rect = RectF()
 
+    /** Reused across every fromPixels() call — draw() runs on every frame, so it must not allocate */
+    private val reusableGeoPoint = GeoPoint(0.0, 0.0)
+
     override fun draw(canvas: Canvas, mapView: MapView, shadow: Boolean) {
         if (shadow) return
 
@@ -71,6 +77,15 @@ class MapNightOverlay : Overlay() {
         val h = mapView.height
         val stepPx = 4 // sample every N pixels — balance quality vs CPU
 
+        // The map is never rotated, so latitude depends only on y and longitude only on x.
+        // Resolve the top/bottom latitudes once instead of once per column.
+        val latTopRad = Math.toRadians((proj.fromPixels(0, 0, reusableGeoPoint) ?: return).latitude)
+        val latBotRad = Math.toRadians((proj.fromPixels(0, h - 1, reusableGeoPoint) ?: return).latitude)
+        val sinLatTop = sin(latTopRad)
+        val cosLatTop = cos(latTopRad)
+        val sinLatBot = sin(latBotRad)
+        val cosLatBot = cos(latBotRad)
+
         // We scan column by column. For each column we determine the longitude,
         // then find the latitude range that is in night and shade it.
         // Since longitude is constant along a vertical strip and the day/night
@@ -79,22 +94,14 @@ class MapNightOverlay : Overlay() {
 
         var x = 0
         while (x < w) {
-            // Get the geographic coordinate at the top and bottom of this column.
-            val geoTop = proj.fromPixels(x, 0) ?: run { x += stepPx; continue }
-            val geoBot = proj.fromPixels(x, h - 1) ?: run { x += stepPx; continue }
-
+            val geoTop = proj.fromPixels(x, 0, reusableGeoPoint) ?: run { x += stepPx; continue }
             val lonRad = Math.toRadians(geoTop.longitude)
             val cosLonDiff = cos(lonRad - sunLonRad)
 
-            // Top pixel geographic lat
-            val latTopRad = Math.toRadians(geoTop.latitude)
-            // Bottom pixel geographic lat (osmdroid: y=0 is top of screen, higher y = lower lat)
-            val latBotRad = Math.toRadians(geoBot.latitude)
-
             // dot(sunVec, pointVec) < 0 → night
             // dot = sin(lat)*sinSunLat + cos(lat)*cosSunLat*cosLonDiff
-            val dotTop = sin(latTopRad) * sinSunLat + cos(latTopRad) * cosSunLat * cosLonDiff
-            val dotBot = sin(latBotRad) * sinSunLat + cos(latBotRad) * cosSunLat * cosLonDiff
+            val dotTop = sinLatTop * sinSunLat + cosLatTop * cosSunLat * cosLonDiff
+            val dotBot = sinLatBot * sinSunLat + cosLatBot * cosSunLat * cosLonDiff
 
             when {
                 dotTop < 0 && dotBot < 0 -> {
@@ -142,7 +149,7 @@ class MapNightOverlay : Overlay() {
         var hi = yBot
         while (hi - lo > 1) {
             val mid = (lo + hi) / 2
-            val geo = proj.fromPixels(x, mid) ?: return mid
+            val geo = proj.fromPixels(x, mid, reusableGeoPoint) ?: return mid
             val latRad = Math.toRadians(geo.latitude)
             val dot = sin(latRad) * sinSunLat + cos(latRad) * cosSunLat * cosLonDiff
             if (dot < 0) hi = mid else lo = mid

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

@@ -90,6 +90,10 @@ import com.rtbishop.look4sat.core.presentation.TopBar
 import com.rtbishop.look4sat.core.presentation.isVerticalLayout
 import com.rtbishop.look4sat.core.presentation.layoutPadding
 import org.osmdroid.tileprovider.tilesource.XYTileSource
+import org.osmdroid.events.DelayedMapListener
+import org.osmdroid.events.MapListener
+import org.osmdroid.events.ScrollEvent
+import org.osmdroid.events.ZoomEvent
 import org.osmdroid.util.GeoPoint
 import org.osmdroid.views.CustomZoomButtonsController
 import org.osmdroid.views.MapView
@@ -145,6 +149,21 @@ fun MapDestination() {
     val viewModel: MapViewModel = viewModel(factory = MapViewModel.factory(container))
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
     val mapView = rememberMapViewWithLifecycle()
+    val lifecycle = LocalLifecycleOwner.current.lifecycle
+    DisposableEffect(lifecycle) {
+        val observer = LifecycleEventObserver { _, event ->
+            when (event) {
+                Lifecycle.Event.ON_START -> viewModel.onAction(MapAction.SetVisible(true))
+                Lifecycle.Event.ON_STOP -> viewModel.onAction(MapAction.SetVisible(false))
+                else -> {}
+            }
+        }
+        lifecycle.addObserver(observer)
+        onDispose {
+            lifecycle.removeObserver(observer)
+            viewModel.onAction(MapAction.SetVisible(false))
+        }
+    }
     MapScreen(uiState, viewModel::onAction, mapView)
 }
 
@@ -162,11 +181,38 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
     var selectedAward by remember { mutableStateOf<AwardType?>(AwardType.VUCC) }
     // Six-award progress derived from the confirmed QSO store; recomputed when
     // the store changes (LoTW/Wavelog sync).
-    val awardProgress: List<AwardProgress> = remember(uiState.workedGridQsos) {
-        AwardCalculator.calculate(uiState.workedGridQsos)
+    // Per operated-grid VUCC breakdown: myGrid -> set of worked grids worked from it.
+    val vuccByMyGrid: Map<String, Set<String>> = remember(uiState.workedGridQsos) {
+        val m = mutableMapOf<String, MutableSet<String>>()
+        for ((grid, qsos) in uiState.workedGridQsos) {
+            for (q in qsos) {
+                val mg = q.myGrid ?: continue
+                m.getOrPut(mg) { mutableSetOf() }.add(grid)
+            }
+        }
+        m
+    }
+    // Selected operated grid for VUCC counting; defaults to the grid with the
+    // most worked grids. Null when the store carries no per-QSO myGrid data
+    // (requires a LoTW resync) — then VUCC falls back to the global count.
+    var selectedMyGrid by remember(vuccByMyGrid) {
+        mutableStateOf(vuccByMyGrid.maxByOrNull { it.value.size }?.key)
+    }
+    val awardProgress: List<AwardProgress> = remember(uiState.workedGridQsos, vuccByMyGrid, selectedMyGrid) {
+        val vuccGrids = selectedMyGrid?.let { vuccByMyGrid[it].orEmpty() }
+        val base = AwardCalculator.calculate(uiState.workedGridQsos)
+        if (vuccGrids == null) base
+        else base.map { p ->
+            if (p.type == AwardType.VUCC) p.copy(workedKeys = vuccGrids, count = vuccGrids.size) else p
+        }
+    }
+    // Worked grids drawn on the map: filtered by the selected operated grid
+    // (null = all operated grids). Drives both the green fills and the tap
+    // listener below, so switching the selector changes which cells are green.
+    val workedGrids = remember(uiState.workedGrids, vuccByMyGrid, selectedMyGrid) {
+        if (selectedMyGrid == null) uiState.workedGrids
+        else vuccByMyGrid[selectedMyGrid] ?: emptySet()
     }
-    // Attach the tap listener whenever grid mode / worked grids change.
-    val workedGrids = uiState.workedGrids
     val isGridMode = uiState.isGridMode
     DisposableEffect(isGridMode, workedGrids) {
         val receiver = object : org.osmdroid.events.MapEventsReceiver {
@@ -255,7 +301,7 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
                         // stationPosition would swallow the centering forever.
                         val shouldCenter = uiState.isGridMode && !prevGridMode
                         setGridMode(
-                            uiState.isGridMode, uiState.workedGrids, uiState.roamedGrids, view,
+                            uiState.isGridMode, workedGrids, uiState.roamedGrids, view,
                             uiState.stationPosition,
                             centerOnStation = shouldCenter
                         )
@@ -279,6 +325,19 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
                         if (isVertical) MapDataCard(mapData) else MapDataCards(mapData)
                     }
                 }
+                // Top-left: operated-grid selector for VUCC counting (grid mode only).
+                // Shown whenever per-grid QSO data exists; "All" (null) is available.
+                if (uiState.isGridMode && selectedAward == AwardType.VUCC && vuccByMyGrid.isNotEmpty()) {
+                    VuccGridSelector(
+                        options = vuccByMyGrid,
+                        allCount = uiState.workedGrids.size,
+                        selected = selectedMyGrid,
+                        onSelect = { selectedMyGrid = it },
+                        modifier = Modifier
+                            .align(Alignment.TopStart)
+                            .padding(8.dp)
+                    )
+                }
                 GridModeToggle(
                     isGridMode = uiState.isGridMode,
                     onToggle = { onAction(MapAction.ToggleGridMode(it)) },
@@ -381,18 +440,36 @@ private fun WorkedGridCallRow(
                 style = MaterialTheme.typography.titleMedium,
                 fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace,
                 color = MaterialTheme.colorScheme.tertiary,
+                maxLines = 1,
+                overflow = androidx.compose.ui.text.style.TextOverflow.Ellipsis,
                 modifier = Modifier.weight(1f)
             )
             Text(
-                text = formatDate(first.epochMs, isUtc),
+                // Plurals resources don't work for zh (only 'other' matches), so
+                // pick the singular/plural string explicitly.
+                text = if (callQsos.size == 1) stringResource(R.string.grid_qso_count_one, 1)
+                else stringResource(R.string.grid_qso_count_many, callQsos.size),
                 style = MaterialTheme.typography.bodySmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
-            )
-            Text(
-                text = if (expanded) " ▴" else " ▾",
-                fontSize = 18.sp,
-                color = MaterialTheme.colorScheme.primary
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                textAlign = androidx.compose.ui.text.style.TextAlign.Center,
+                modifier = Modifier.weight(1f)
             )
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.End,
+                modifier = Modifier.weight(1f)
+            ) {
+                Text(
+                    text = formatDate(first.epochMs, isUtc),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+                Text(
+                    text = if (expanded) " ▴" else " ▾",
+                    fontSize = 18.sp,
+                    color = MaterialTheme.colorScheme.primary
+                )
+            }
         }
         // First-QSO summary line, always visible.
         Text(
@@ -560,6 +637,93 @@ private fun AwardChipsRow(
     }
 }
 
+/**
+ * Compact pill toggle for switching between satellite view and grid mode,
+ * floated over the map's top-right corner. The label reflects the active
+ * mode ("Grid mode" when ON, "Satellite mode" when OFF). Semi-transparent
+ * background keeps the map readable underneath.
+ */
+@Composable
+private fun VuccGridSelector(
+    options: Map<String, Set<String>>,
+    allCount: Int,
+    selected: String?,
+    onSelect: (String?) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    var expanded by remember { mutableStateOf(false) }
+    // Most-worked grid first; selection is made on tap. "All" sits last.
+    val sorted = remember(options) { options.entries.sortedByDescending { it.value.size } }
+    Surface(
+        color = ComposeColor.Black.copy(alpha = 0.45f),
+        shape = RoundedCornerShape(8.dp),
+        modifier = modifier
+    ) {
+        Column {
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                modifier = Modifier
+                    .clickable { expanded = !expanded }
+                    .padding(start = 10.dp, end = 6.dp, top = 4.dp, bottom = 4.dp)
+            ) {
+                Text(
+                    text = if (selected == null) "All ($allCount)"
+                    else "$selected (${options[selected]?.size ?: 0})",
+                    color = ComposeColor.White,
+                    fontSize = 12.sp,
+                    fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace
+                )
+                Text(
+                    text = if (expanded) " ▴" else " ▾",
+                    fontSize = 18.sp,
+                    color = MaterialTheme.colorScheme.primary,
+                    modifier = Modifier.padding(start = 4.dp)
+                )
+            }
+            if (expanded) {
+                androidx.compose.material3.HorizontalDivider(color = ComposeColor.White.copy(alpha = 0.2f))
+                sorted.forEach { (grid, grids) ->
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .clickable {
+                                onSelect(grid)
+                                expanded = false
+                            }
+                            .padding(horizontal = 10.dp, vertical = 3.dp)
+                    ) {
+                        Text(
+                            text = "$grid (${grids.size})",
+                            color = if (grid == selected) MaterialTheme.colorScheme.primary else ComposeColor.White,
+                            fontSize = 12.sp,
+                            fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace
+                        )
+                    }
+                }
+                // "All" always listed last: shows every worked grid combined.
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .clickable {
+                            onSelect(null)
+                            expanded = false
+                        }
+                        .padding(horizontal = 10.dp, vertical = 3.dp)
+                ) {
+                    Text(
+                        text = "All ($allCount)",
+                        color = if (selected == null) MaterialTheme.colorScheme.primary else ComposeColor.White,
+                        fontSize = 12.sp,
+                        fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace
+                    )
+                }
+            }
+        }
+    }
+}
+
 /**
  * Compact pill toggle for switching between satellite view and grid mode,
  * floated over the map's top-right corner. The label reflects the active
@@ -731,6 +895,27 @@ private fun setStationPosition(stationPos: GeoPos, mapView: MapView) {
     }
 }
 
+/** Above this many satellites inside the viewport labels are dropped in favor of a single
+ * shared dot icon. Per-satellite label bitmaps cost ~90KB each, so drawing thousands of them
+ * exhausts memory and stalls the UI thread — and overlapping labels are unreadable anyway. */
+private const val LABEL_LIMIT = 128
+
+/** Degrees of space around the viewport so markers don't pop in at the edges */
+private const val VIEWPORT_MARGIN = 8.0
+
+/** Debounce for viewport-driven marker refreshes, in milliseconds */
+private const val MAP_LISTENER_DELAY = 128L
+
+/** Shared dot icon used when too many satellites are visible to label them */
+private var dotIcon: Drawable? = null
+
+/** Scratch list reused every frame to avoid per-tick allocation */
+private val visibleSats = ArrayList<Pair<OrbitalObject, GeoPos>>()
+
+/** Last emitted positions, replayed on scroll/zoom so culled markers appear without waiting for a tick */
+private var lastPositions: Map<OrbitalObject, GeoPos>? = null
+private var lastAction: ((OrbitalObject) -> Unit)? = null
+
 /** Pool of reusable Marker objects keyed by satellite name, to avoid re-creation every frame */
 private val markerPool = HashMap<String, Marker>()
 private var lastMapView: MapView? = null
@@ -741,13 +926,20 @@ private fun setPositions(
     action: (OrbitalObject) -> Unit
 ) {
     try {
+        lastPositions = posMap
+        lastAction = action
         // Clear caches when the MapView instance changes (e.g. config change)
         if (lastMapView !== mapView) {
             lastMapView = mapView
             markerPool.clear()
             iconCache.evictAll()
+            dotIcon = null
             footprintPolyline = null
             footprintPoints = null
+            mapView.addMapListener(DelayedMapListener(object : MapListener {
+                override fun onScroll(event: ScrollEvent?) = refreshPositions(mapView)
+                override fun onZoom(event: ZoomEvent?) = refreshPositions(mapView)
+            }, MAP_LISTENER_DELAY))
         }
         // Reuse the existing FolderOverlay — creating a new one and replacing it
         // causes osmdroid to detach shared Marker objects, making them invisible.
@@ -756,17 +948,48 @@ private fun setPositions(
         }
         folder.items.clear()
 
-        val activeNames = HashSet<String>(posMap.size)
-        posMap.forEach { (satellite, geoPos) ->
+        // Cull satellites outside the viewport: only meaningful once zoomed in, but that is
+        // exactly when marker labels are shown and drawing is most expensive.
+        visibleSats.clear()
+        if (mapView.width > 0 && mapView.height > 0) {
+            val box = mapView.boundingBox
+            val latNorth = box.latNorth + VIEWPORT_MARGIN
+            val latSouth = box.latSouth - VIEWPORT_MARGIN
+            val lonWest = box.lonWest - VIEWPORT_MARGIN
+            val lonEast = box.lonEast + VIEWPORT_MARGIN
+            val wrapsDateLine = box.lonWest > box.lonEast
+            for ((satellite, geoPos) in posMap) {
+                val lat = geoPos.latitude
+                if (lat !in latSouth..latNorth) continue
+                val lon = geoPos.longitude
+                val isLonVisible = if (wrapsDateLine) lon >= lonWest || lon <= lonEast
+                else lon in lonWest..lonEast
+                if (isLonVisible) visibleSats.add(satellite to geoPos)
+            }
+        } else {
+            for (entry in posMap) visibleSats.add(entry.key to entry.value)
+        }
+
+        val showLabels = visibleSats.size <= LABEL_LIMIT
+        val activeNames = HashSet<String>(visibleSats.size)
+        for ((satellite, geoPos) in visibleSats) {
             val name = satellite.data.name
             activeNames.add(name)
             val marker = markerPool.getOrPut(name) {
                 Marker(mapView).apply {
                     setInfoWindow(null)
                     setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_CENTER)
-                    icon = getCachedTextIcon(name, mapView)
+                    // Resolve the satellite via relatedObject so the listener is allocated
+                    // once per marker instead of once per satellite per tick
+                    setOnMarkerClickListener { clicked, _ ->
+                        (clicked.relatedObject as? OrbitalObject)?.let(action)
+                        true
+                    }
                 }
             }
+            marker.relatedObject = satellite
+            val icon = if (showLabels) getCachedTextIcon(name, mapView) else getDotIcon(mapView)
+            if (marker.icon !== icon) marker.icon = icon
             // Update position in-place — reuse existing GeoPoint if available
             val pos = marker.position
             if (pos != null) {
@@ -775,22 +998,34 @@ private fun setPositions(
             } else {
                 marker.position = GeoPoint(geoPos.latitude, geoPos.longitude)
             }
-            marker.setOnMarkerClickListener { _, _ ->
-                action(satellite)
-                true
-            }
             folder.add(marker)
         }
-        // Evict markers for satellites no longer tracked
-        val iter = markerPool.keys.iterator()
-        while (iter.hasNext()) {
-            if (iter.next() !in activeNames) iter.remove()
-        }
+        // Evict markers that are no longer tracked or no longer visible
+        markerPool.keys.retainAll(activeNames)
+        visibleSats.clear()
     } catch (e: Exception) {
         println(e)
     }
 }
 
+/** Re-applies the last known positions against the new viewport after a pan or zoom */
+private fun refreshPositions(mapView: MapView): Boolean {
+    // Grid mode disables the satellite layer — don't re-populate markers off-screen
+    if (mapView.overlays.getOrNull(OVERLAY_POSITIONS)?.isEnabled == false) return true
+    val posMap = lastPositions ?: return false
+    val action = lastAction ?: return false
+    setPositions(posMap, mapView, action)
+    mapView.invalidate()
+    return true
+}
+
+private fun getDotIcon(mapView: MapView): Drawable = dotIcon ?: run {
+    val size = 20
+    val bitmap = createBitmap(size, size)
+    Canvas(bitmap).drawCircle(size / 2f, size / 2f, size / 2f - 2f, textPaint)
+    bitmap.toDrawable(mapView.context.resources).also { dotIcon = it }
+}
+
 private fun getCachedTextIcon(name: String, mapView: MapView): Drawable {
     iconCache[name]?.let { return it }
     val labelRect = Rect()
@@ -966,9 +1201,23 @@ private fun rememberMapViewWithLifecycle(): MapView {
         lifecycle.addObserver(lifecycleObserver)
         onDispose { lifecycle.removeObserver(lifecycleObserver) }
     }
+    // The overlay caches below are file-level (shared across MapView instances), so they must be
+    // released with the MapView or they keep the Activity and its bitmaps alive after disposal.
+    DisposableEffect(mapView) {
+        onDispose { clearMapCaches() }
+    }
     return mapView
 }
 
+private fun clearMapCaches() {
+    markerPool.clear()
+    iconCache.evictAll()
+    dotIcon = null
+    lastPositions = null
+    lastAction = null
+    lastMapView = null
+}
+
 @Composable
 private fun rememberMapViewLifecycleObserver(mapView: MapView) = remember(mapView) {
     LifecycleEventObserver { _, event ->

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

@@ -48,6 +48,7 @@ sealed interface MapAction {
     data class SelectItem(val item: OrbitalObject) : MapAction
     data class SelectDefaultItem(val catnum: Int) : MapAction
     data class ToggleGridMode(val value: Boolean) : MapAction
+    data class SetVisible(val isVisible: Boolean) : MapAction
 }
 
 data class MapData(

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

@@ -37,6 +37,7 @@ import com.rtbishop.look4sat.core.domain.utility.toDegrees
 import com.rtbishop.look4sat.core.domain.utility.toTimerString
 import com.rtbishop.look4sat.core.presentation.getDefaultPass
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.async
 import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.cancelAndJoin
@@ -45,6 +46,7 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
@@ -69,6 +71,9 @@ class MapViewModel(
     private var dataUpdateJob: Job? = null
     private var dataUpdateRate = 1000L
     private var selectedOrbitalObject: OrbitalObject? = null
+
+    /** Gates the prediction loop so it doesn't burn CPU while the map isn't on screen */
+    private val isScreenVisible = MutableStateFlow(true)
     val uiState: StateFlow<MapState> = _uiState
 
     init {
@@ -100,6 +105,7 @@ class MapViewModel(
             is MapAction.SelectItem -> selectSatellite(action.item)
             is MapAction.SelectDefaultItem -> selectDefaultSatellite(action.catnum)
             is MapAction.ToggleGridMode -> settingsRepo.updateOtherSettings { it.copy(stateOfMapGrid = action.value) }
+            is MapAction.SetVisible -> isScreenVisible.value = action.isVisible
         }
     }
 
@@ -137,7 +143,11 @@ class MapViewModel(
         selectedOrbitalObject = orbitalObject
         viewModelScope.launch {
             dataUpdateJob?.cancelAndJoin()
-            dataUpdateJob = launch {
+            // Default dispatcher is mandatory: viewModelScope is Main.immediate, and every
+            // satelliteRepo call internally hops to Default and resumes back on the caller's
+            // dispatcher. On Main that posts one continuation per satellite per tick, which
+            // floods the looper and ANRs for users tracking thousands of objects.
+            dataUpdateJob = launch(Dispatchers.Default) {
                 val dateNow = Date()
                 getStationPosition()
                 getSatTrack(orbitalObject, stationPos, dateNow)
@@ -148,6 +158,8 @@ class MapViewModel(
                     else -> updateFreq
                 }
                 while (isActive) {
+                    // Suspends while the map is off-screen instead of predicting into the void
+                    isScreenVisible.first { it }
                     dateNow.time = System.currentTimeMillis()
                     updateMapState(orbitalObject, allSatellites, stationPos, dateNow)
                     delay(effectiveRate)

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

@@ -175,9 +175,12 @@ class PassesViewModel(
         val sdfDate = dateFormat(tz)
         val sdfTime = SimpleDateFormat("HH:mm", Locale.getDefault()).also { it.timeZone = tz }
         val result = LinkedHashMap<String, Pair<String, String>>()
-        // DeepSpace group always shows today's sun times
+        // DeepSpace group always shows today's sun times.
+        // The natural-day anchor is the DEVICE timezone, not the display timezone:
+        // UTC midnight is 08:00 local for UTC+8 stations, when the sun is already
+        // up — that would trip the white-night guard and render "--:--".
         if (passes.any { it.isDeepSpace }) {
-            val riseSet = findTodaySunRiseSet(stationPos, startOfDayMillis(System.currentTimeMillis(), tz))
+            val riseSet = findTodaySunRiseSet(stationPos, startOfDayMillis(System.currentTimeMillis(), TimeZone.getDefault()))
             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
@@ -186,7 +189,7 @@ class PassesViewModel(
             if (pass.isDeepSpace) continue
             val label = sdfDate.format(Date(pass.aosTime))
             if (label in result) continue
-            val riseSet = findTodaySunRiseSet(stationPos, startOfDayMillis(pass.aosTime, tz))
+            val riseSet = findTodaySunRiseSet(stationPos, startOfDayMillis(pass.aosTime, TimeZone.getDefault()))
             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

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

@@ -32,8 +32,11 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.pager.HorizontalPager
 import androidx.compose.foundation.pager.rememberPagerState
@@ -166,6 +169,7 @@ private fun RadarScreen(
     Column(
         modifier = Modifier
             .layoutPadding()
+            .padding(bottom = WindowInsets.navigationBars.asPaddingValues().calculateBottomPadding())
             .keepScreenOn(),
         verticalArrangement = Arrangement.spacedBy(6.dp)
     ) {

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 #noinspection UnusedVersionCatalogEntry
-appVersionCode = "469"
+appVersionCode = "472"
 #noinspection UnusedVersionCatalogEntry
-appVersionName = "4.4.6-ba7opf.10.4"
+appVersionName = "4.4.7-ba7opf.2"
 #noinspection UnusedVersionCatalogEntry
 compileSdk = "37"
 #noinspection UnusedVersionCatalogEntry