fix: restore saved per-satellite calculator offset on open

The per-satellite doppler offset was loaded only inside SelectTransmitter, so
it never came back when the radar page was reopened, and it was saved under
the selected transceiver catnum - null after toggling the selection off, which
dropped the write silently. The CalculatorPage chips that trigger
SelectTransmitter are only rendered when a satellite has more than one linear
transponder after deduplication, so single-transponder satellites (JO-97,
RS-44, FO-29, AO-73, QO-100, TO-108, FO-82, QB50P1, UKUBE-1) had no way to
load it at all.

The offset now follows the transponder driving the calculator: it loads when
that transponder changes and saves under its catnum regardless of selection.

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

@@ -27,6 +27,8 @@ import android.view.View
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.lifecycle.lifecycleScope
 import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
@@ -48,8 +50,10 @@ class MainActivity : ComponentActivity() {
         enableEdgeToEdge()
         super.onCreate(savedInstanceState)
         observeNightFilterState()
+        val settingsRepo = (applicationContext as IContainerProvider).getMainContainer().settingsRepo
         setContent {
-            MainTheme(isDarkTheme = true) { NavRoot() }
+            val otherSettings by settingsRepo.otherSettings.collectAsState()
+            MainTheme(isDarkTheme = !otherSettings.stateOfLightTheme) { NavRoot() }
         }
     }
 

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

@@ -99,29 +99,43 @@ fun NavRoot(deeplink: String? = null) {
     // Reverse: outgoing slides out to the right, incoming drifts in from the left
     val popTransition = slideInHorizontally(tween(300)) { -it / 3 } togetherWith
         slideOutHorizontally(tween(300)) { it }
-    NavDisplay(
-        modifier = Modifier.fillMaxSize(),
-        backStack = rootBackStack,
-        onBack = navigateBack,
-        transitionSpec = { pushTransition },
-        popTransitionSpec = { popTransition },
-        predictivePopTransitionSpec = { popTransition },
-        entryDecorators = listOf(
-            rememberSaveableStateHolderNavEntryDecorator(),
-            rememberViewModelStoreNavEntryDecorator()
-        ),
-        entryProvider = entryProvider {
-            entry<Screen.Passes> { MainScreen(navigateToRadar = navigateToRadar) }
-            entry<RadarDestination> {
-                Surface(
-                    modifier = Modifier.fillMaxSize(),
-                    color = MaterialTheme.colorScheme.background
-                ) {
-                    RadarDestination(navigateUp = navigateBack)
+    // Elevation color thresholds must be provided at the root level so that BOTH
+    // the tab content (MainScreen) and the root-level RadarDestination see the
+    // user's custom thresholds. RadarDestination is a sibling entry of MainScreen
+    // in this NavDisplay, so a provider inside MainScreen never reaches it.
+    val context = LocalContext.current
+    val container = (context.applicationContext as IContainerProvider).getMainContainer()
+    val otherSettings by container.settingsRepo.otherSettings.collectAsStateWithLifecycle()
+    CompositionLocalProvider(
+        LocalElevationThresholds provides ElevationThresholds(
+            low = otherSettings.lowElevation,
+            high = otherSettings.highElevation
+        )
+    ) {
+        NavDisplay(
+            modifier = Modifier.fillMaxSize(),
+            backStack = rootBackStack,
+            onBack = navigateBack,
+            transitionSpec = { pushTransition },
+            popTransitionSpec = { popTransition },
+            predictivePopTransitionSpec = { popTransition },
+            entryDecorators = listOf(
+                rememberSaveableStateHolderNavEntryDecorator(),
+                rememberViewModelStoreNavEntryDecorator()
+            ),
+            entryProvider = entryProvider {
+                entry<Screen.Passes> { MainScreen(navigateToRadar = navigateToRadar) }
+                entry<RadarDestination> {
+                    Surface(
+                        modifier = Modifier.fillMaxSize(),
+                        color = MaterialTheme.colorScheme.background
+                    ) {
+                        RadarDestination(navigateUp = navigateBack)
+                    }
                 }
             }
-        }
-    )
+        )
+    }
 }
 
 @Composable
@@ -129,7 +143,6 @@ private fun MainScreen(navigateToRadar: () -> Unit = {}) {
     val context = LocalContext.current
     val container = (context.applicationContext as IContainerProvider).getMainContainer()
     val trackingState by container.radioTrackingService.state.collectAsStateWithLifecycle()
-    val otherSettings by container.settingsRepo.otherSettings.collectAsStateWithLifecycle()
 
     val backStack = rememberNavBackStack(Screen.Passes)
     val currentKey = backStack.lastOrNull()
@@ -139,88 +152,81 @@ private fun MainScreen(navigateToRadar: () -> Unit = {}) {
     val navItems =
         listOf(Screen.Satellites, Screen.Passes, Screen.Status, Screen.Map, Screen.Settings)
 
-    CompositionLocalProvider(
-        LocalElevationThresholds provides ElevationThresholds(
-            low = otherSettings.lowElevation,
-            high = otherSettings.highElevation
-        )
-    ) {
-        NavigationSuiteScaffold(
-            navigationSuiteItems = {
-                navItems.forEach { screen ->
-                    val isSelected = when (currentKey) {
-                        is Screen.Satellites -> screen is Screen.Satellites
-                        is Screen.Passes -> screen is Screen.Passes
-                        is Screen.Status -> screen is Screen.Status
-                        is Screen.Map -> screen is Screen.Map
-                        is Screen.Settings -> screen is Screen.Settings
-                        else -> false
-                    }
-                    item(
-                        icon = {
-                            Icon(
-                                painter = painterResource(screen.iconResId),
-                                contentDescription = stringResource(screen.titleResId)
-                            )
-                        },
-                        label = { Text(stringResource(screen.titleResId)) },
-                        selected = isSelected,
-                        onClick = {
-                            if (isSelected) return@item
-                            while (backStack.size > 1) backStack.removeAt(backStack.size - 1)
-                            if (screen !is Screen.Passes) backStack.add(screen)
-                        }
-                    )
+    NavigationSuiteScaffold(
+        navigationSuiteItems = {
+            navItems.forEach { screen ->
+                val isSelected = when (currentKey) {
+                    is Screen.Satellites -> screen is Screen.Satellites
+                    is Screen.Passes -> screen is Screen.Passes
+                    is Screen.Status -> screen is Screen.Status
+                    is Screen.Map -> screen is Screen.Map
+                    is Screen.Settings -> screen is Screen.Settings
+                    else -> false
                 }
-            },
-            navigationSuiteColors = NavigationSuiteDefaults.colors(
-                navigationRailContainerColor = MaterialTheme.colorScheme.surfaceContainer
-            ),
-            layoutType = when {
-                !hasEnoughHeight() && hasEnoughWidth() -> NavigationSuiteType.NavigationRail
-                !hasEnoughWidth() -> NavigationSuiteType.ShortNavigationBarCompact
-                else -> NavigationSuiteType.ShortNavigationBarMedium
-            }
-        ) {
-            Column {
-                NavDisplay(
-                    backStack = backStack,
-                    modifier = Modifier.weight(1f),
-                    onBack = navigateBack,
-                    transitionSpec = { fadeTransition },
-                    popTransitionSpec = { fadeTransition },
-                    predictivePopTransitionSpec = { fadeTransition },
-                    entryDecorators = listOf(
-                        rememberSaveableStateHolderNavEntryDecorator(),
-                        rememberViewModelStoreNavEntryDecorator()
-                    ),
-                    entryProvider = entryProvider {
-                        entry<Screen.Satellites> {
-                            SatellitesDestination(navigateUp = navigateBack)
-                        }
-                        entry<Screen.Passes> {
-                            PassesDestination { catNum, aosTime ->
-                                container.satelliteRepo.selectPass(catNum, aosTime)
-                                navigateToRadar()
-                            }
-                        }
-                        entry<Screen.Status> { SatStatusDestination() }
-                        entry<Screen.Map> { MapDestination() }
-                        entry<Screen.Settings> { SettingsDestination() }
+                item(
+                    icon = {
+                        Icon(
+                            painter = painterResource(screen.iconResId),
+                            contentDescription = stringResource(screen.titleResId)
+                        )
+                    },
+                    label = { Text(stringResource(screen.titleResId)) },
+                    selected = isSelected,
+                    onClick = {
+                        if (isSelected) return@item
+                        while (backStack.size > 1) backStack.removeAt(backStack.size - 1)
+                        if (screen !is Screen.Passes) backStack.add(screen)
                     }
                 )
-                if (trackingState.isActive) {
-                    TrackingBanner(
-                        state = trackingState,
-                        onClick = {
-                            val pass = trackingState.currentPass
-                            if (pass != null) {
-                                container.satelliteRepo.selectPass(pass.catNum, pass.aosTime)
-                                navigateToRadar()
-                            }
+            }
+        },
+        navigationSuiteColors = NavigationSuiteDefaults.colors(
+            navigationRailContainerColor = MaterialTheme.colorScheme.surfaceContainer
+        ),
+        layoutType = when {
+            !hasEnoughHeight() && hasEnoughWidth() -> NavigationSuiteType.NavigationRail
+            !hasEnoughWidth() -> NavigationSuiteType.ShortNavigationBarCompact
+            else -> NavigationSuiteType.ShortNavigationBarMedium
+        }
+    ) {
+        Column {
+            NavDisplay(
+                backStack = backStack,
+                modifier = Modifier.weight(1f),
+                onBack = navigateBack,
+                transitionSpec = { fadeTransition },
+                popTransitionSpec = { fadeTransition },
+                predictivePopTransitionSpec = { fadeTransition },
+                entryDecorators = listOf(
+                    rememberSaveableStateHolderNavEntryDecorator(),
+                    rememberViewModelStoreNavEntryDecorator()
+                ),
+                entryProvider = entryProvider {
+                    entry<Screen.Satellites> {
+                        SatellitesDestination(navigateUp = navigateBack)
+                    }
+                    entry<Screen.Passes> {
+                        PassesDestination { catNum, aosTime ->
+                            container.satelliteRepo.selectPass(catNum, aosTime)
+                            navigateToRadar()
                         }
-                    )
+                    }
+                    entry<Screen.Status> { SatStatusDestination() }
+                    entry<Screen.Map> { MapDestination() }
+                    entry<Screen.Settings> { SettingsDestination() }
                 }
+            )
+            if (trackingState.isActive) {
+                TrackingBanner(
+                    state = trackingState,
+                    onClick = {
+                        val pass = trackingState.currentPass
+                        if (pass != null) {
+                            container.satelliteRepo.selectPass(pass.catNum, pass.aosTime)
+                            navigateToRadar()
+                        }
+                    }
+                )
             }
         }
     }

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

@@ -330,12 +330,13 @@ object IcomCivProtocol {
 
     /**
      * Parse frequency + mode from a CMD_READ_FREQ reply payload.
-     * Payload layout after stripping command byte: [5 freq bytes] [mode byte] [filter byte]
+     * Payload layout after stripping command byte: [5 freq bytes]
+     * The IC-705 does not include a mode byte; if one is present it is parsed, otherwise mode is empty.
      */
     fun parseFreqModePayload(payload: ByteArray): Pair<Long, String>? {
-        if (payload.size < 6) return null
+        if (payload.size < 5) return null
         val freqHz = decodeFrequencyBcd(payload.copyOfRange(0, 5))
-        val mode   = BYTE_TO_MODE[payload[5]] ?: return null
+        val mode   = if (payload.size > 5) BYTE_TO_MODE[payload[5]] ?: return null else ""
         return freqHz to mode
     }
 

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
@@ -67,8 +69,9 @@ class SatelliteRepo(
     override suspend fun initRepository() = withContext(dispatcher) {
         combine(
             settingsRepo.selectedIds,
-            settingsRepo.stationPosition
-        ) { selectedIds, _ -> selectedIds }
+            settingsRepo.stationPosition,
+            settingsRepo.otherSettings.map { it.stateOfUtc }.distinctUntilChanged()
+        ) { selectedIds, _, _ -> selectedIds }
             .collect { selectedIds ->
                 _satellites.update { localStorage.getEntriesWithIds(selectedIds) }
                 val settings = settingsRepo.passesSettings.value
@@ -176,7 +179,13 @@ class SatelliteRepo(
         aosEndMinute: Int,
         invertAosTimeWindow: Boolean
     ): Boolean {
-        val offsetMillis = TimeZone.getDefault().getOffset(aosTime).toLong()
+        // Must match the timezone used to display pass times (UTC toggle vs device local)
+        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/test/java/com/rtbishop/look4sat/core/data/framework/IcomCivProtocolTest.kt

@@ -0,0 +1,33 @@
+package com.rtbishop.look4sat.core.data.framework
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNotNull
+import org.junit.Assert.assertNull
+import org.junit.Test
+
+class IcomCivProtocolTest {
+
+    private fun bytes(vararg values: Int) = ByteArray(values.size) { values[it].toByte() }
+
+    @Test
+    fun parseFreqModePayload_ic705ReadFreqReply() {
+        // Reply captured from an IC-705 to CMD 0x03: frequency only, no mode byte
+        val reply = bytes(0xFE, 0xFE, 0xE0, 0xA4, 0x03, 0x60, 0x74, 0x95, 0x45, 0x01, 0xFD)
+        val response = IcomCivProtocol.parseResponse(reply, IcomCivProtocol.CMD_READ_FREQ)
+        assertNotNull(response)
+        assertEquals(145957460L to "", IcomCivProtocol.parseFreqModePayload(response!!.payload))
+    }
+
+    @Test
+    fun parseFreqModePayload_withModeByte() {
+        assertEquals(
+            435611000L to "USB",
+            IcomCivProtocol.parseFreqModePayload(bytes(0x00, 0x10, 0x61, 0x35, 0x04, 0x01, 0x01))
+        )
+    }
+
+    @Test
+    fun parseFreqModePayload_tooShort() {
+        assertNull(IcomCivProtocol.parseFreqModePayload(bytes(0x60, 0x74, 0x95, 0x45)))
+    }
+}

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

@@ -31,4 +31,15 @@ data class OrbitalPass(
     val catNum: Int = orbitalObject.data.catnum
     val name: String = if (hasDecayed) "${orbitalObject.data.name} (decayed?)" else orbitalObject.data.name
     val isDeepSpace: Boolean = orbitalObject.data.isDeepSpace
+
+    /**
+     * Fraction of the pass elapsed at [timeMillis], derived on demand so that a ticking clock
+     * never has to rewrite the pass list. A DeepSpace object is always in view, so it reads 1.
+     */
+    fun progressAt(timeMillis: Long): Float {
+        if (isDeepSpace) return 1f
+        val total = (losTime - aosTime).toFloat()
+        if (total <= 0f) return 0f
+        return ((timeMillis - aosTime) / total).coerceIn(0f, 1f)
+    }
 }

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/utility/DopplerFrequencyCalculator.kt

@@ -16,18 +16,31 @@ import java.util.Locale
 /**
  * Computes Doppler-corrected reciprocal frequencies for linear transponders.
  *
- * For a linear (passband) transponder, uplink and downlink frequencies are
- * related by a fixed passband offset. When the satellite moves, both are
- * Doppler-shifted. Given one, this computes the other:
+ * The full physical path:
  *
- *   downlink → uplink: mapDownlinkToUplink (passband) → getUplinkFreq (Doppler)
- *   uplink → downlink: mapUplinkToDownlink (passband) → getDownlinkFreq (Doppler)
+ * TX to RX (uplink -> downlink):
+ *   1. Ground transmits f_tx
+ *   2. Satellite receives f_tx * (c - v) / c (uplink Doppler)
+ *   3. Satellite transmits the passband mapping of (2) (mapping happens on board)
+ *   4. Ground hears (3) * (c - v) / c (downlink Doppler)
+ *
+ * RX to TX (downlink -> uplink), the same chain in reverse:
+ *   4. Ground hears f_rx
+ *   3. Satellite transmits f_rx * (c + v) / c (undo downlink Doppler)
+ *   2. Satellite receives the inverse passband mapping of (3)
+ *   1. Ground must transmit (2) * (c + v) / c (undo uplink Doppler)
+ *
+ * Both legs of the trip are Doppler shifted and by different amounts (uplink
+ * and downlink frequencies differ), so the mapping must happen between the two
+ * shifts on satellite-received frequencies. Addresses GitHub issue #91
+ * (Custom frequency Doppler correction).
  */
 object DopplerFrequencyCalculator {
 
     /**
-     * Given a downlink frequency, compute the Doppler-corrected uplink frequency.
-     * Returns null if the transponder is not a linear passband type.
+     * Given a downlink frequency (what the user hears), compute the
+     * uplink frequency the user should transmit.
+     * Full path: 4 -> 3 -> 2 -> 1
      */
     fun computeUplinkFromDownlink(
         downlinkHz: Long,
@@ -35,17 +48,23 @@ object DopplerFrequencyCalculator {
         orbitalPos: OrbitalPos
     ): Long? {
         if (!isLinearTransponder(transponder)) return null
-        val baseUplink = TransponderMapper.mapDownlinkToUplink(downlinkHz, transponder) ?: return null
-        return orbitalPos.getUplinkFreq(baseUplink)
+        // 4 -> 3 undo the downlink Doppler: the frequency the satellite transmits
+        val satTx = orbitalPos.getUplinkFreq(downlinkHz)
+        // 3 -> 2 inverse passband mapping
+        val satRx = TransponderMapper.mapDownlinkToUplink(satTx, transponder) ?: return null
+        // 2 -> 1 undo the uplink Doppler: the frequency the ground station transmits
+        return orbitalPos.getUplinkFreq(satRx)
     }
 
     /**
-     * Given a downlink frequency, compute the Doppler-corrected uplink frequency
-     * with an offset applied to the downlink (in Hz).
-     * Returns null if the transponder is not a linear passband type.
+     * Given a downlink frequency (what the user hears), compute the
+     * uplink frequency the user should transmit, with an offset applied
+     * to the downlink (in Hz).
+     * Full path: 4 -> 3 -> 2 -> 1
      *
      * The user-entered downlink frequency already includes the offset, so subtract
-     * it before mapping the downlink passband position back to the uplink.
+     * it before the inverse passband mapping. The offset lives in the satellite
+     * frequency domain, hence it is removed after undoing the downlink Doppler.
      */
     fun computeUplinkFromDownlinkWithOffset(
         downlinkHz: Long,
@@ -54,13 +73,20 @@ object DopplerFrequencyCalculator {
         offsetHz: Long
     ): Long? {
         if (!isLinearTransponder(transponder)) return null
-        val baseUplink = TransponderMapper.mapDownlinkToUplink(downlinkHz - offsetHz, transponder) ?: return null
-        return orbitalPos.getUplinkFreq(baseUplink)
+        // 4 -> 3 undo the downlink Doppler (the offset travels with it)
+        val satTxWithOffset = orbitalPos.getUplinkFreq(downlinkHz)
+        // 3 remove the offset (it lives in the satellite frequency domain)
+        val satTx = satTxWithOffset - offsetHz
+        // 3 -> 2 inverse passband mapping
+        val satRx = TransponderMapper.mapDownlinkToUplink(satTx, transponder) ?: return null
+        // 2 -> 1 undo the uplink Doppler
+        return orbitalPos.getUplinkFreq(satRx)
     }
 
     /**
-     * Given an uplink frequency, compute the Doppler-corrected downlink frequency.
-     * Returns null if the transponder is not a linear passband type.
+     * Given an uplink frequency (what the user transmits), compute the
+     * downlink frequency the user will hear.
+     * Full path: 1 -> 2 -> 3 -> 4
      */
     fun computeDownlinkFromUplink(
         uplinkHz: Long,
@@ -68,14 +94,19 @@ object DopplerFrequencyCalculator {
         orbitalPos: OrbitalPos
     ): Long? {
         if (!isLinearTransponder(transponder)) return null
-        val baseDownlink = TransponderMapper.mapUplinkToDownlink(uplinkHz, transponder) ?: return null
-        return orbitalPos.getDownlinkFreq(baseDownlink)
+        // 1 -> 2 uplink Doppler: the frequency the satellite receives
+        val satRx = orbitalPos.getDownlinkFreq(uplinkHz)
+        // 2 -> 3 passband mapping
+        val satTx = TransponderMapper.mapUplinkToDownlink(satRx, transponder) ?: return null
+        // 3 -> 4 downlink Doppler: what the ground station hears
+        return orbitalPos.getDownlinkFreq(satTx)
     }
 
     /**
-     * Given an uplink frequency, compute the Doppler-corrected downlink frequency
-     * with an offset applied to the downlink (in Hz).
-     * Returns null if the transponder is not a linear passband type.
+     * Given an uplink frequency (what the user transmits), compute the
+     * downlink frequency the user will hear, with an offset applied
+     * to the downlink (in Hz).
+     * Full path: 1 -> 2 -> 3 -> 4
      */
     fun computeDownlinkFromUplinkWithOffset(
         uplinkHz: Long,
@@ -84,8 +115,12 @@ object DopplerFrequencyCalculator {
         offsetHz: Long
     ): Long? {
         if (!isLinearTransponder(transponder)) return null
-        val baseDownlink = TransponderMapper.mapUplinkToDownlink(uplinkHz, transponder) ?: return null
-        return orbitalPos.getDownlinkFreq(baseDownlink + offsetHz)
+        // 1 -> 2 uplink Doppler: the frequency the satellite receives
+        val satRx = orbitalPos.getDownlinkFreq(uplinkHz)
+        // 2 -> 3 passband mapping
+        val satTx = TransponderMapper.mapUplinkToDownlink(satRx, transponder) ?: return null
+        // 3 apply the offset (satellite frequency domain), 3 -> 4 downlink Doppler
+        return orbitalPos.getDownlinkFreq(satTx + offsetHz)
     }
 
     /** True if this transponder supports linear passband mapping. */

core/domain/src/test/java/com/rtbishop/look4sat/core/domain/DopplerFrequencyCalculatorTest.kt

@@ -268,6 +268,71 @@ class DopplerFrequencyCalculatorTest {
         val roundTripDownlink = DopplerFrequencyCalculator.computeDownlinkFromUplink(uplink!!, xpdr, orbitalPos)
         assertNotNull(roundTripDownlink)
         val error = kotlin.math.abs(roundTripDownlink!! - originalDownlink)
-        assertTrue("Round-trip error too large: $error", error < 10000)
+        // Both legs of the trip carry their own Doppler shift, so the reverse
+        // computation must undo both. A single-shift implementation leaves an
+        // error of roughly (uplink + downlink) Doppler, ~6.8 kHz at 3.5 km/s.
+        assertTrue("Round-trip error too large: $error", error < 100)
+    }
+
+    @Test
+    fun computeDownlinkFromUplink_appliesUplinkAndDownlinkDoppler() {
+        // 7 km/s range rate: the uplink is Doppler shifted before the passband
+        // mapping and the downlink after it. Both shifts must be applied - the
+        // mapping happens on the satellite-received frequency, not the ground one.
+        val xpdr = linearTransponder()
+        val orbitalPos = pos(7.0)
+        val downlink = DopplerFrequencyCalculator.computeDownlinkFromUplink(145_200_000L, xpdr, orbitalPos)
+        assertNotNull(downlink)
+        // A single-shift implementation maps the ground frequency first and
+        // yields 435_189_838 here, missing the uplink shift of 3391 Hz.
+        assertEquals(435_186_447L, downlink)
+    }
+
+    @Test
+    fun computeDownlinkFromUplink_inverted_appliesUplinkAndDownlinkDoppler() {
+        val xpdr = linearTransponder(inverted = true, downHigh = 435_500_000L)
+        val orbitalPos = pos(7.0)
+        val downlink = DopplerFrequencyCalculator.computeDownlinkFromUplink(145_200_000L, xpdr, orbitalPos)
+        assertNotNull(downlink)
+        assertEquals(435_293_226L, downlink)
+    }
+
+    @Test
+    fun computeUplinkFromDownlink_roundTripAtHighRangeRate() {
+        val xpdr = linearTransponder()
+        val orbitalPos = pos(7.0)
+        val originalUplink = 145_200_000L
+        val downlink = DopplerFrequencyCalculator.computeDownlinkFromUplink(originalUplink, xpdr, orbitalPos)
+        assertNotNull(downlink)
+        val roundTripUplink = DopplerFrequencyCalculator.computeUplinkFromDownlink(downlink!!, xpdr, orbitalPos)
+        assertNotNull(roundTripUplink)
+        val error = kotlin.math.abs(roundTripUplink!! - originalUplink)
+        // A single-shift implementation is not its own inverse: the round trip
+        // drifts by ~(uplink + downlink) Doppler, 13.5 kHz at 7 km/s.
+        assertTrue("Round-trip error too large: $error", error < 100)
+    }
+
+    @Test
+    fun computeOffsetRoundTrip_atHighRangeRate() {
+        val xpdr = linearTransponder()
+        val orbitalPos = pos(7.0)
+        val originalUplink = 145_200_000L
+        val downlink = DopplerFrequencyCalculator.computeDownlinkFromUplinkWithOffset(
+            uplinkHz = originalUplink,
+            transponder = xpdr,
+            orbitalPos = orbitalPos,
+            offsetHz = 2_500L
+        )
+        assertNotNull(downlink)
+        assertEquals(435_188_947L, downlink)
+        val roundTripUplink = DopplerFrequencyCalculator.computeUplinkFromDownlinkWithOffset(
+            downlinkHz = downlink!!,
+            transponder = xpdr,
+            orbitalPos = orbitalPos,
+            offsetHz = 2_500L
+        )
+        assertNotNull(roundTripUplink)
+        val error = kotlin.math.abs(roundTripUplink!! - originalUplink)
+        assertTrue("Round-trip error too large: $error", error < 100)
     }
 }

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

@@ -39,6 +39,7 @@ import androidx.compose.foundation.layout.statusBars
 import androidx.compose.foundation.layout.statusBarsPadding
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.CircularProgressIndicator
@@ -46,21 +47,32 @@ import androidx.compose.material3.ElevatedButton
 import androidx.compose.material3.ElevatedCard
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
 import androidx.compose.material3.LocalTextStyle
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.ProgressIndicatorDefaults
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.rememberModalBottomSheetState
 import androidx.compose.material3.adaptive.currentWindowAdaptiveInfoV2
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.compositionLocalOf
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.drawWithCache
 import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.Path
+import androidx.compose.ui.graphics.Shape
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.graphics.addOutline
 import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.graphics.drawscope.clipRect
 import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
 import androidx.compose.ui.input.nestedscroll.NestedScrollSource
 import androidx.compose.ui.input.nestedscroll.nestedScroll
@@ -428,6 +440,55 @@ private fun DialogShell(
     }
 }
 
+@Composable
+fun SearchBar(onQueryChange: (String) -> Unit, modifier: Modifier = Modifier) {
+    val currentQuery = rememberSaveable { mutableStateOf("") }
+    val updateQuery = { newValue: String ->
+        currentQuery.value = newValue
+        onQueryChange(newValue)
+    }
+    ElevatedCard(modifier = modifier.height(48.dp)) {
+        Row(
+            horizontalArrangement = Arrangement.Start,
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier.padding(start = 12.dp)
+        ) {
+            Icon(painter = painterResource(id = R.drawable.ic_search), contentDescription = null)
+            BasicTextField(
+                value = currentQuery.value,
+                onValueChange = updateQuery,
+                singleLine = true,
+                modifier = Modifier
+                    .weight(1f)
+                    .padding(start = 12.dp),
+                textStyle = TextStyle(
+                    fontSize = 16.sp,
+                    lineHeight = 20.sp,
+                    fontWeight = FontWeight.Medium,
+                    color = MaterialTheme.colorScheme.onSurface
+                ),
+                decorationBox = { innerTextField ->
+                    if (currentQuery.value.isEmpty()) {
+                        Text(
+                            text = stringResource(id = R.string.sat_search_hint),
+                            fontSize = 16.sp,
+                            lineHeight = 20.sp,
+                            fontWeight = FontWeight.Medium,
+                            color = MaterialTheme.colorScheme.onSurface
+                        )
+                    }
+                    innerTextField()
+                },
+                cursorBrush = SolidColor(MaterialTheme.colorScheme.onSurface)
+            )
+            IconButton(onClick = { updateQuery("") }) {
+                val clearCd = stringResource(R.string.sat_search_clear)
+                Icon(painter = painterResource(id = R.drawable.ic_close), contentDescription = clearCd)
+            }
+        }
+    }
+}
+
 @Composable
 fun hasEnoughHeight(): Boolean =
     currentWindowAdaptiveInfoV2().windowSizeClass.isHeightAtLeastBreakpoint(480)
@@ -580,3 +641,30 @@ fun formatFrequency(frequencyHz: Long): String {
     val hz = frequencyHz % 1_000
     return String.format(Locale.ENGLISH, "%d.%03d.%03d", mhz, khz, hz)
 }
+
+/**
+ * Strokes the [shape] outline as a track, then reveals it left to right up to the [progress]
+ * fraction of the width, so the top and bottom edges fill in sync.
+ */
+@Composable
+fun Modifier.progressOutline(
+    progress: Float,
+    shape: Shape = RoundedCornerShape(12.dp),
+    width: Dp = 0.5.dp,
+    trackColor: Color = ProgressIndicatorDefaults.linearTrackColor,
+    progressColor: Color = ProgressIndicatorDefaults.linearColor
+) = this.drawWithCache {
+    val widthPx = width.toPx()
+    val outline = shape.createOutline(Size(size.width - widthPx, size.height - widthPx), layoutDirection, this)
+    val outlinePath = Path().apply {
+        addOutline(outline)
+        translate(Offset(widthPx / 2f, widthPx / 2f))
+    }
+    val stroke = Stroke(width = widthPx)
+    val revealWidth = size.width * progress.coerceIn(0f, 1f)
+    onDrawWithContent {
+        drawContent()
+        drawPath(outlinePath, trackColor, style = stroke)
+        clipRect(right = revealWidth) { drawPath(outlinePath, progressColor, style = stroke) }
+    }
+}

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

@@ -61,8 +61,8 @@ fun MainTheme(isDarkTheme: Boolean = isSystemInDarkTheme(), content: @Composable
             SideEffect {
                 val window = (view.context as ComponentActivity).window
                 val insetsController = WindowCompat.getInsetsController(window, view)
-                insetsController.isAppearanceLightStatusBars = false
-                insetsController.isAppearanceLightNavigationBars = false
+                insetsController.isAppearanceLightStatusBars = !isDarkTheme
+                insetsController.isAppearanceLightNavigationBars = !isDarkTheme
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                     window.isNavigationBarContrastEnforced = false
                 }

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

@@ -39,6 +39,7 @@ fun SwipeableItem(onSwipeRight: () -> Unit, onSwipeLeft: () -> Unit, content: @C
     val dismissThresholdPx = with(LocalDensity.current) { 120.dp.toPx() }
     val dismissState = rememberSwipeToDismissBoxState { dismissThresholdPx }
     val willTrigger by remember { derivedStateOf { dismissState.targetValue != SwipeToDismissBoxValue.Settled } }
+    val isSwiping by remember { derivedStateOf { dismissState.dismissDirection != SwipeToDismissBoxValue.Settled } }
     val hapticFeedback = LocalHapticFeedback.current
     LaunchedEffect(willTrigger) {
         val feedbackType = if (willTrigger) HapticFeedbackType.LongPress else HapticFeedbackType.SegmentTick
@@ -49,8 +50,10 @@ fun SwipeableItem(onSwipeRight: () -> Unit, onSwipeLeft: () -> Unit, content: @C
         enableDismissFromStartToEnd = true,
         enableDismissFromEndToStart = true,
         backgroundContent = {
-            val isSwipeRight = dismissState.dismissDirection == SwipeToDismissBoxValue.StartToEnd
-            SwipeBackground(isSwipeRight, willTrigger, MaterialTheme.colorScheme.primary)
+            if (isSwiping) {
+                val isSwipeRight = dismissState.dismissDirection == SwipeToDismissBoxValue.StartToEnd
+                SwipeBackground(isSwipeRight, willTrigger, MaterialTheme.colorScheme.primary)
+            }
         },
         content = { content() },
         onDismiss = {

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

@@ -161,10 +161,13 @@
 
     <string name="prefs_other_title">Otros</string>
     <string name="prefs_other_switch_utc">Hora UTC</string>
-    <string name="prefs_other_switch_update">Actualización automática</string>
+    <string name="prefs_other_switch_update">Auto-actualizar</string>
     <string name="prefs_other_switch_sweep">Animación radar</string>
     <string name="prefs_other_switch_sensors">Sensores</string>
     <string name="prefs_other_switch_night_mode">Filtro nocturno</string>
+    <string name="prefs_other_switch_light_theme">Tema claro</string>
+    <string name="prefs_other_compass_offset_az">Desfase de brújula (ácimut)</string>
+    <string name="prefs_other_compass_offset_elev">Desfase de brújula (elevación)</string>
 
     <string name="prefs_highlight_title">Resaltado de elevación</string>
     <string name="prefs_highlight_low">Baja &lt; %1$d°</string>

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

@@ -161,10 +161,13 @@
 
     <string name="prefs_other_title">Прочее</string>
     <string name="prefs_other_switch_utc">Время в UTC</string>
-    <string name="prefs_other_switch_update">Автообновление данных</string>
+    <string name="prefs_other_switch_update">Автообновление</string>
     <string name="prefs_other_switch_sweep">Анимация радара</string>
     <string name="prefs_other_switch_sensors">Сенсоры</string>
     <string name="prefs_other_switch_night_mode">Ночной фильтр</string>
+    <string name="prefs_other_switch_light_theme">Светлая тема</string>
+    <string name="prefs_other_compass_offset_az">Смещение компаса (азимут)</string>
+    <string name="prefs_other_compass_offset_elev">Смещение компаса (элевация)</string>
 
     <string name="prefs_highlight_title">Подсветка высоты</string>
     <string name="prefs_highlight_low">Низко &lt; %1$d°</string>

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

@@ -161,10 +161,13 @@
 
     <string name="prefs_other_title">වෙනත්</string>
     <string name="prefs_other_switch_utc">UTC වේලාව</string>
-    <string name="prefs_other_switch_update">දත්ත ස්වයං යාවත්කාලීන</string>
-    <string name="prefs_other_switch_sweep">Radar sweep</string>
+    <string name="prefs_other_switch_update">ස්වයං යාවත්කාලීන</string>
+    <string name="prefs_other_switch_sweep">රේඩාර් පරිලෝකනය</string>
     <string name="prefs_other_switch_sensors">සංවේදක</string>
     <string name="prefs_other_switch_night_mode">රාත්‍රී පෙරහන</string>
+    <string name="prefs_other_switch_light_theme">ආලෝක තේමාව</string>
+    <string name="prefs_other_compass_offset_az">මාලිමා අපගමනය (දිගංශය)</string>
+    <string name="prefs_other_compass_offset_elev">මාලිමා අපගමනය (උත්තෝලනය)</string>
 
     <string name="prefs_highlight_title">උස් උද්දීපනය</string>
     <string name="prefs_highlight_low">අඩු &lt; %1$d°</string>

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

@@ -193,10 +193,13 @@
 
     <string name="prefs_other_title">Diğer</string>
     <string name="prefs_other_switch_utc">UTC saati</string>
-    <string name="prefs_other_switch_update">Veriyi otomatik güncelle</string>
+    <string name="prefs_other_switch_update">Otomatik güncelle</string>
     <string name="prefs_other_switch_sweep">Radar taraması</string>
     <string name="prefs_other_switch_sensors">Sensör</string>
     <string name="prefs_other_switch_night_mode">Gece filtresi</string>
+    <string name="prefs_other_switch_light_theme">Açık tema</string>
+    <string name="prefs_other_compass_offset_az">Pusula sapması (azimut)</string>
+    <string name="prefs_other_compass_offset_elev">Pusula sapması (yükseklik açısı)</string>
 
     <string name="prefs_highlight_title">Elevasyon vurgusu</string>
     <string name="prefs_highlight_low">Düşük &lt; %1$d°</string>

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

@@ -161,10 +161,13 @@
 
     <string name="prefs_other_title">Інше</string>
     <string name="prefs_other_switch_utc">Час в UTC</string>
-    <string name="prefs_other_switch_update">Автооновлення даних</string>
+    <string name="prefs_other_switch_update">Автооновлення</string>
     <string name="prefs_other_switch_sweep">Анімація радара</string>
     <string name="prefs_other_switch_sensors">Сенсори</string>
     <string name="prefs_other_switch_night_mode">Нічний фільтр</string>
+    <string name="prefs_other_switch_light_theme">Світла тема</string>
+    <string name="prefs_other_compass_offset_az">Зміщення компаса (азимут)</string>
+    <string name="prefs_other_compass_offset_elev">Зміщення компаса (піднесення)</string>
 
     <string name="prefs_highlight_title">Підсвічування висоти</string>
     <string name="prefs_highlight_low">Низько &lt; %1$d°</string>

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

@@ -219,12 +219,13 @@
 
     <string name="prefs_other_title">其他</string>
     <string name="prefs_other_switch_utc">UTC 时间</string>
-    <string name="prefs_other_switch_update">自动更新数据</string>
-    <string name="prefs_other_switch_sweep">雷达扫描动画</string>
-    <string name="prefs_other_switch_sensors">传感器控制雷达</string>
+    <string name="prefs_other_switch_update">自动更新</string>
+    <string name="prefs_other_switch_sweep">雷达扫描</string>
+    <string name="prefs_other_switch_sensors">传感器</string>
     <string name="prefs_other_switch_night_mode">红色夜间模式</string>
-    <string name="prefs_other_compass_offset">雷达罗盘水平偏移量</string>
-    <string name="prefs_other_compass_offset_elev">雷达罗盘俯仰偏移量</string>
+    <string name="prefs_other_switch_light_theme">浅色主题</string>
+    <string name="prefs_other_compass_offset_az">罗盘偏移量（方位角）</string>
+    <string name="prefs_other_compass_offset_elev">罗盘偏移量（仰角）</string>
 
     <string name="prefs_highlight_title">仰角高亮</string>
     <string name="prefs_highlight_low">低 &lt; %1$d°</string>

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

@@ -47,8 +47,13 @@
     <string name="pass_deep_space" translatable="false">DeepSpace</string>
     <string name="pass_altitude">Altitude: %d km</string>
     <string name="pass_aosLos" translatable="false">%03d° - %03d°</string>
+    <string name="pass_azimuth" translatable="false">%03d°</string>
+    <string name="pass_duration_placeholder" translatable="false">--m --s</string>
+    <string name="pass_timer_aos" translatable="false">AOS %s</string>
+    <string name="pass_timer_los" translatable="false">LOS %s</string>
     <string name="pass_empty_list_message">
         Make sure your filters are correct and you have selected satellites</string>
+    <string name="pass_empty_search_message">No upcoming passes match your search</string>
     <string name="pass_error_message">There are no upcoming satellite passes to display</string>
     <string name="pass_welcome_title">Welcome to Look4Sat\!</string>
     <string name="pass_welcome_message">
@@ -56,14 +61,12 @@
         \n\nPlease update the database at least weekly to get accurate predictions.</string>
     <string name="pass_whatsnew_title" translatable="false">What\'s new in Look4Sat</string>
     <string name="pass_whatsnew_message" translatable="false">
-        * Tweaked sunrise/sunset calculations, added tests by atsunatsu (#241)
-        \n\n* Overhauled sources import, added HTTP status by wty2019wty (#242)
-        \nSources now have priority - the top ones define satellite names and transceiver data.
-        \nYou can enable/disable sources and restore defaults via the Satellite data import dialog.
-        \n\n* Localized AMSAT status screen for Chinese by atsunatsu (#245)
-        \n\n* Extracted hardcoded UI strings to resources by TianhengZhuang (#247)
-        \n\n* Added AMSAT satellite status reports submission by atsunatsu (#248)
-        \n\n* Slightly optimized map performance to reduce ANRs and memory consumption. Zoom in to see satellite labels.
+        * Fixed AOS window filter to follow the UTC setting by wty2019wty (#252)
+        \n\n* Applied elevation color thresholds to the Radar by atsunatsu (#253)
+        \n\n* Added fuzzy satellite search ignoring separators by atsunatsu (#255)
+        \n\n* Added light theme suitable for e-ink devices by Ondrej Kolonicny (#256)
+        \n\n* Fixed IC-705 frequency read in dual-radio mode by Michael S (#260)
+        \n\n* Fixed day/night map overlay calculation and display issue by rt-bishop
     </string>
 
     <!-- AMSAT Status screen -->
@@ -262,12 +265,13 @@
 
     <string name="prefs_other_title">Other</string>
     <string name="prefs_other_switch_utc">UTC time</string>
-    <string name="prefs_other_switch_update">Auto-update data</string>
+    <string name="prefs_other_switch_update">Auto-update</string>
     <string name="prefs_other_switch_sweep">Radar sweep</string>
-    <string name="prefs_other_switch_sensors">Use sensors</string>
+    <string name="prefs_other_switch_sensors">Sensors</string>
     <string name="prefs_other_switch_night_mode">Night filter</string>
-    <string name="prefs_other_compass_offset">Radar compass offset</string>
-    <string name="prefs_other_compass_offset_elev">Radar compass offset (elev)</string>
+    <string name="prefs_other_switch_light_theme">Light theme</string>
+    <string name="prefs_other_compass_offset_az">Compass offset (azimuth)</string>
+    <string name="prefs_other_compass_offset_elev">Compass offset (elevation)</string>
 
     <string name="prefs_highlight_title">Elevation highlight</string>
     <string name="prefs_highlight_low">Low &lt; %1$d°</string>

fastlane/metadata/android/en-US/changelogs/default.txt

@@ -1,5 +1,6 @@
-* Tweaked sun calculations, added tests by atsunatsu (#241)
-* Overhauled sources import, added HTTP status by wty2019wty (#242)
-* Localized AMSAT status screen for Chinese by atsunatsu (#245)
-* Extracted hardcoded UI strings to resources by TianhengZhuang (#247)
-* Added AMSAT satellite status reports submission by atsunatsu (#248)
+* Fixed AOS window filter to follow the UTC setting by wty2019wty (#252)
+* Applied elevation color thresholds to the Radar by atsunatsu (#253)
+* Added fuzzy satellite search ignoring separators by atsunatsu (#255)
+* Added light theme suitable for e-ink devices by Ondrej Kolonicny (#256)
+* Fixed IC-705 frequency read in dual-radio mode by Michael S (#260)
+* Fixed day/night map overlay calculation and display issue by rt-bishop

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

@@ -116,8 +116,9 @@ class MapNightOverlay : Overlay() {
 
                 else -> {
                     // Terminator crosses this column — find the crossing pixel by binary search
-                    val crossY = findCrossingY(proj, x, 0, h - 1, sinSunLat, cosSunLat, cosLonDiff)
-                    if (dotTop < 0) {
+                    val isNightAtTop = dotTop < 0
+                    val crossY = findCrossingY(proj, x, 0, h - 1, sinSunLat, cosSunLat, cosLonDiff, isNightAtTop)
+                    if (isNightAtTop) {
                         // Night at top, day at bottom
                         rect.set(x.toFloat(), 0f, (x + stepPx).toFloat(), crossY.toFloat())
                         canvas.drawRect(rect, nightPaint)
@@ -134,7 +135,11 @@ class MapNightOverlay : Overlay() {
 
     /**
      * Binary-search for the pixel row where the day/night boundary crosses column [x].
-     * [yTop] is in day, [yBot] is in night (or vice versa).
+     *
+     * [isNightAtTop] states which side [yTop] is on. Both polarities occur: the pole nearest
+     * the sub-solar point is lit, so the terminator runs day-over-night while the sub-solar
+     * latitude is positive and night-over-day once it turns negative after the September
+     * equinox. Anchoring lo to the top pixel's side keeps the search valid either way.
      */
     private fun findCrossingY(
         proj: org.osmdroid.views.Projection,
@@ -143,7 +148,8 @@ class MapNightOverlay : Overlay() {
         yBot: Int,
         sinSunLat: Double,
         cosSunLat: Double,
-        cosLonDiff: Double
+        cosLonDiff: Double,
+        isNightAtTop: Boolean
     ): Int {
         var lo = yTop
         var hi = yBot
@@ -152,7 +158,8 @@ class MapNightOverlay : Overlay() {
             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
+            // Keep lo on the top pixel's side of the terminator and hi on the opposite side
+            if ((dot < 0) == isNightAtTop) lo = mid else hi = mid
         }
         return (lo + hi) / 2
     }

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

@@ -122,6 +122,39 @@ private val moonIconPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
         android.graphics.PorterDuffColorFilter("#E0E0E0".toColorInt(), android.graphics.PorterDuff.Mode.SRC_IN)
 }
 
+/** Accent used for the station marker; recolored per theme so it stays visible on a light map. */
+private var mapAccentColor = "#FFE082".toColorInt()
+
+/** The dark-map filter (grayscale + invert) is only applied when NOT in light theme; cached to avoid rebuilds. */
+private val darkTileFilter by lazy { createColorFilter() }
+
+/**
+ * Recolor the shared overlay paints for the current theme. The light OSM tiles are white, so the
+ * dark-theme amber/grey overlays would vanish; light theme swaps them for dark, high-contrast colors.
+ * Must run before the set*() overlay builders on each frame, as several icons cache the paint color.
+ */
+private fun applyMapColors(isLightUi: Boolean) {
+    if (isLightUi) {
+        mapAccentColor = "#715C0C".toColorInt() // dark amber (matches app lightScheme primary)
+        footprintPaint.color = mapAccentColor
+        textPaint.color = "#1E1B13".toColorInt()
+        textPaint.setShadowLayer(3f, 3f, 3f, Color.WHITE)
+        sunIconPaint.colorFilter =
+            android.graphics.PorterDuffColorFilter(mapAccentColor, android.graphics.PorterDuff.Mode.SRC_IN)
+        moonIconPaint.colorFilter =
+            android.graphics.PorterDuffColorFilter("#4C4639".toColorInt(), android.graphics.PorterDuff.Mode.SRC_IN)
+    } else {
+        mapAccentColor = "#FFE082".toColorInt()
+        footprintPaint.color = mapAccentColor
+        textPaint.color = mapAccentColor
+        textPaint.setShadowLayer(3f, 3f, 3f, Color.BLACK)
+        sunIconPaint.colorFilter =
+            android.graphics.PorterDuffColorFilter(mapAccentColor, android.graphics.PorterDuff.Mode.SRC_IN)
+        moonIconPaint.colorFilter =
+            android.graphics.PorterDuffColorFilter("#E0E0E0".toColorInt(), android.graphics.PorterDuff.Mode.SRC_IN)
+    }
+}
+
 @Composable
 fun MapDestination() {
     val context = LocalContext.current
@@ -177,6 +210,8 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
         ElevatedCard(modifier = Modifier.weight(1f)) {
             Box(contentAlignment = Alignment.BottomCenter) {
                 AndroidView({ mapView }) { view ->
+                    applyMapColors(uiState.isLightUi)
+                    view.overlayManager.tilesOverlay.setColorFilter(if (uiState.isLightUi) null else darkTileFilter)
                     uiState.stationPosition?.let { setStationPosition(it, view) }
                     uiState.track?.let { setSatelliteTrack(it, view) }
                     uiState.footprint?.let { setFootprint(it, view) }
@@ -288,7 +323,9 @@ private fun setStationPosition(stationPos: GeoPos, mapView: MapView) {
             mapView.overlays[OVERLAY_STATION] = Marker(mapView).apply {
                 setInfoWindow(null)
                 setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_BOTTOM)
-                icon = ContextCompat.getDrawable(mapView.context, R.drawable.ic_position)
+                icon = ContextCompat.getDrawable(mapView.context, R.drawable.ic_position)?.apply {
+                    setTint(mapAccentColor)
+                }
                 position = GeoPoint(stationPos.latitude, stationPos.longitude)
             }
         }
@@ -585,7 +622,7 @@ private fun rememberMapViewWithLifecycle(): MapView {
             zoomController.setVisibility(CustomZoomButtonsController.Visibility.NEVER)
             overlayManager.tilesOverlay.loadingBackgroundColor = Color.TRANSPARENT
             overlayManager.tilesOverlay.loadingLineColor = Color.TRANSPARENT
-            overlayManager.tilesOverlay.setColorFilter(createColorFilter())
+            // Tile color filter (dark inversion vs light) is applied per-theme in the AndroidView update block.
             setScrollableAreaLimitLatitude(maxLat, minLat, 0)
             overlays.addAll(Array(OVERLAY_COUNT) { FolderOverlay() })
         }

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

@@ -80,7 +80,7 @@ class MapViewModel(
     init {
         viewModelScope.launch {
             settingsRepo.otherSettings.collectLatest { settings ->
-                _uiState.update { it.copy(isUtc = settings.stateOfUtc) }
+                _uiState.update { it.copy(isUtc = settings.stateOfUtc, isLightUi = settings.stateOfLightTheme) }
             }
         }
         val (selectedCatNum, _) = satelliteRepo.selectedPass.value
@@ -106,7 +106,7 @@ class MapViewModel(
     private fun selectDefaultSatellite(catnum: Int) {
         if (allSatellites.isNotEmpty()) {
             if (catnum == -1) {
-                allPasses.find { pass -> pass.progress < 100 && !pass.isDeepSpace }
+                allPasses.find { pass -> pass.progress < 1 && !pass.isDeepSpace }
                     ?.let { pass -> selectSatellite(pass.orbitalObject) }
             } else {
                 allSatellites.find { it.data.catnum == catnum }?.let { selectSatellite(it) }
@@ -189,8 +189,8 @@ class MapViewModel(
                 }
             }
             for ((localPositions, localSelectedPos) in deferreds.awaitAll()) {
-                for (pair in localPositions) {
-                    positionsMap[pair.first] = pair.second
+                for ((first, second) in localPositions) {
+                    positionsMap[first] = second
                 }
                 if (localSelectedPos != null) {
                     selectedSatPos = localSelectedPos

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

@@ -17,11 +17,6 @@
  */
 package com.rtbishop.look4sat.feature.passes
 
-import androidx.compose.animation.AnimatedContent
-import androidx.compose.animation.core.tween
-import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
-import androidx.compose.animation.togetherWith
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
@@ -37,16 +32,18 @@ import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.items
 import androidx.compose.material3.ElevatedCard
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.LinearProgressIndicator
+import androidx.compose.material3.LocalTextStyle
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.pulltorefresh.PullToRefreshBox
 import androidx.compose.material3.pulltorefresh.PullToRefreshDefaults
 import androidx.compose.material3.pulltorefresh.rememberPullToRefreshState
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -54,6 +51,8 @@ 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.LineHeightStyle
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
@@ -65,19 +64,21 @@ import com.rtbishop.look4sat.core.domain.predict.NearEarthObject
 import com.rtbishop.look4sat.core.domain.predict.OrbitalData
 import com.rtbishop.look4sat.core.domain.predict.OrbitalPass
 import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
+import com.rtbishop.look4sat.core.domain.utility.toTimerString
 import com.rtbishop.look4sat.core.presentation.EmptyListCard
 import com.rtbishop.look4sat.core.presentation.IconCard
 import com.rtbishop.look4sat.core.presentation.MainTheme
 import com.rtbishop.look4sat.core.presentation.NextPassRow
 import com.rtbishop.look4sat.core.presentation.R
 import com.rtbishop.look4sat.core.presentation.ScreenColumn
-import com.rtbishop.look4sat.core.presentation.SwipeableItem
-import com.rtbishop.look4sat.core.presentation.TimerRow
+import com.rtbishop.look4sat.core.presentation.SearchBar
 import com.rtbishop.look4sat.core.presentation.TopBar
 import com.rtbishop.look4sat.core.presentation.WhatsNewDialog
 import com.rtbishop.look4sat.core.presentation.elevationColor
 import com.rtbishop.look4sat.core.presentation.infiniteMarquee
 import com.rtbishop.look4sat.core.presentation.isVerticalLayout
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
@@ -89,12 +90,13 @@ fun PassesDestination(navigateToRadar: (Int, Long) -> Unit) {
     val container = (context.applicationContext as IContainerProvider).getMainContainer()
     val viewModel: PassesViewModel = viewModel(factory = PassesViewModel.factory(container))
     val uiState = viewModel.uiState.collectAsStateWithLifecycle().value
-    PassesScreen(uiState, viewModel::onAction, navigateToRadar)
+    PassesScreen(uiState, viewModel.timeNow, viewModel::onAction, navigateToRadar)
 }
 
 @Composable
 private fun PassesScreen(
     uiState: PassesState,
+    timeNow: StateFlow<Long>,
     onAction: (PassesAction) -> Unit,
     navigateToRadar: (Int, Long) -> Unit
 ) {
@@ -145,7 +147,10 @@ private fun PassesScreen(
                     IconCard(action = { onAction(PassesAction.ToggleRadiosDialog) }, resId = R.drawable.ic_radios)
                 },
                 topInfo = {
-                    TimerRow(timeString = uiState.nextTime, isTimeAos = uiState.isNextTimeAos)
+                    SearchBar(
+                        onQueryChange = { onAction(PassesAction.SearchFor(it)) },
+                        modifier = Modifier.weight(1f)
+                    )
                 },
                 bottomInfo = {
                     NextPassRow(pass = uiState.nextPass, isUtc = uiState.isUtc)
@@ -162,14 +167,14 @@ private fun PassesScreen(
             passes = uiState.itemsList,
             groupedPasses = uiState.groupedPasses,
             sunTimes = uiState.sunTimes,
-            focusedCatNum = uiState.focusedCatNum,
+            isSearching = uiState.searchQuery.isNotBlank(),
+            timeNow = timeNow,
             navigateToRadar = navigateToRadar,
             onAction = onAction
         )
     }
 }
 
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun PassesList(
     isRefreshing: Boolean,
@@ -177,7 +182,8 @@ private fun PassesList(
     passes: List<OrbitalPass>,
     groupedPasses: Map<String, List<OrbitalPass>>,
     sunTimes: Map<String, Pair<String, String>>,
-    focusedCatNum: Int?,
+    isSearching: Boolean,
+    timeNow: StateFlow<Long>,
     navigateToRadar: (Int, Long) -> Unit,
     onAction: (PassesAction) -> Unit
 ) {
@@ -199,38 +205,28 @@ private fun PassesList(
             }
         ) {
             if (passes.isEmpty()) {
-                EmptyListCard(message = stringResource(R.string.pass_empty_list_message))
+                val emptyMessage = if (isSearching) {
+                    stringResource(R.string.pass_empty_search_message)
+                } else {
+                    stringResource(R.string.pass_empty_list_message)
+                }
+                EmptyListCard(message = emptyMessage)
             } else {
-                AnimatedContent(
-                    targetState = focusedCatNum,
-                    transitionSpec = { fadeIn(tween(200)) togetherWith fadeOut(tween(200)) },
-                    label = "PassesFocusTransition"
-                ) { targetFocus ->
-                    LazyVerticalGrid(columns = GridCells.Adaptive(320.dp), modifier = Modifier.fillMaxSize()) {
-                        for ((dateLabel, dayPasses) in groupedPasses) {
-                            val headerVisible = targetFocus == null || dayPasses.any { it.catNum == targetFocus }
-                            if (headerVisible) {
-                                stickyHeader(key = "header_$dateLabel") {
-                                    val (rise, set) = sunTimes[dateLabel] ?: ("--:--" to "--:--")
-                                    StickyDateHeader(label = dateLabel, sunriseTime = rise, sunsetTime = set)
-                                }
-                            }
-                            val visiblePasses = if (targetFocus == null) dayPasses
-                            else dayPasses.filter { it.catNum == targetFocus }
-                            items(items = visiblePasses, key = { item -> item.catNum + item.aosTime }) { pass ->
-                                SwipeableItem(
-                                    onSwipeRight = { onAction(PassesAction.FocusCatNum(pass.catNum)) },
-                                    onSwipeLeft = { onAction(PassesAction.ClearFocus) }
-                                ) {
-                                    PassItem(
-                                        pass = pass,
-                                        navigateToRadar = navigateToRadar,
-                                        modifier = Modifier.animateItem(),
-                                        isVerticalLayout = isVerticalLayout,
-                                        isUtc = isUtc
-                                    )
-                                }
-                            }
+                LazyVerticalGrid(columns = GridCells.Adaptive(320.dp), modifier = Modifier.fillMaxSize()) {
+                    for ((dateLabel, dayPasses) in groupedPasses) {
+                        stickyHeader(key = "header_$dateLabel") {
+                            val (rise, set) = sunTimes[dateLabel] ?: ("--:--" to "--:--")
+                            StickyDateHeader(label = dateLabel, sunriseTime = rise, sunsetTime = set)
+                        }
+                        items(items = dayPasses, key = { item -> "${item.catNum}_${item.aosTime}" }) { pass ->
+                            PassItem(
+                                pass = pass,
+                                navigateToRadar = navigateToRadar,
+                                timeNow = timeNow,
+                                modifier = Modifier.animateItem(),
+                                isVerticalLayout = isVerticalLayout,
+                                isUtc = isUtc
+                            )
                         }
                     }
                 }
@@ -278,7 +274,7 @@ private fun StickyDateHeader(label: String, sunriseTime: String, sunsetTime: Str
     }
 }
 
-private fun displayLocale(): Locale {
+internal fun displayLocale(): Locale {
     val locale = Locale.getDefault()
     return if (locale.language == Locale.CHINESE.language) locale else Locale.ENGLISH
 }
@@ -288,51 +284,127 @@ private fun displayLocale(): Locale {
 private fun DeepSpacePassPreview() {
     val data = OrbitalData("Satellite", 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 45000, 0.0)
     val satellite = DeepSpaceObject(data)
-    val pass = OrbitalPass(1L, 180.0, 10L, 360.0, 36650, 45.0, satellite, 0.5f)
-    MainTheme { PassItem(pass = pass, { _, _ -> }) }
+    val pass = OrbitalPass(1L, 180.0, 10L, 180.0, 36650, 45.0, satellite, 0.5f)
+    MainTheme { PassItem(pass = pass, { _, _ -> }, MutableStateFlow(0L)) }
 }
 
 @Preview(showBackground = true)
 @Composable
-private fun NearEarthPassPreview() {
+private fun UpcomingPassPreview() {
     val data = OrbitalData("Satellite", 0.0, 15.0, 0.0, 0.0, 0.0, 0.0, 0.0, 45000, 0.0)
-    val satellite = NearEarthObject(data)
-    val pass = OrbitalPass(1L, 180.0, 10L, 360.0, 36650, 45.0, satellite, 0.5f)
-    MainTheme { PassItem(pass = pass, { _, _ -> }) }
+    val aosTime = 1767225600000L
+    val pass = OrbitalPass(aosTime, 180.0, aosTime + 702000L, 360.0, 36650, 45.0, NearEarthObject(data), 0f)
+    MainTheme { PassItem(pass = pass, { _, _ -> }, MutableStateFlow(aosTime - 866000L)) }
+}
+
+@Preview(showBackground = true)
+@Composable
+private fun ActivePassPreview() {
+    val data = OrbitalData("Satellite", 0.0, 15.0, 0.0, 0.0, 0.0, 0.0, 0.0, 45000, 0.0)
+    val aosTime = 1767225600000L
+    val pass = OrbitalPass(aosTime, 180.0, aosTime + 702000L, 360.0, 36650, 45.0, NearEarthObject(data), 0.4f)
+    MainTheme { PassItem(pass = pass, { _, _ -> }, MutableStateFlow(aosTime + 280000L)) }
+}
+
+/**
+ * Countdown to AOS while the pass is pending, then to LOS while it is active.
+ * Gray denotes a pending pass, primary an active one. Collects the clock itself so a
+ * tick recomposes only this chip.
+ */
+@Composable
+private fun PassTimerChip(pass: OrbitalPass, timeNow: StateFlow<Long>) {
+    val now by timeNow.collectAsStateWithLifecycle()
+    // A DeepSpace object is permanently in view, so it gets a neutral label instead of a countdown
+    val isActive = !pass.isDeepSpace && now >= pass.aosTime
+    val text = when {
+        pass.isDeepSpace -> stringResource(R.string.pass_deep_space)
+        isActive -> stringResource(R.string.pass_timer_los, (pass.losTime - now).toTimerString())
+        else -> stringResource(R.string.pass_timer_aos, (pass.aosTime - now).toTimerString())
+    }
+    Surface(
+        shape = MaterialTheme.shapes.small,
+        color = if (isActive) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.surfaceVariant,
+        contentColor = if (isActive) {
+            MaterialTheme.colorScheme.onPrimary
+        } else {
+            MaterialTheme.colorScheme.onSurfaceVariant
+        }
+    ) {
+        Text(
+            text = text,
+            fontSize = 14.sp,
+            fontWeight = FontWeight.Medium,
+            style = LocalTextStyle.current.copy(
+                // Tabular figures stop the chip reflowing on every tick, while the trimmed
+                // line height keeps it short without shrinking the timer text
+                fontFeatureSettings = "tnum",
+                lineHeight = 16.sp,
+                lineHeightStyle = LineHeightStyle(
+                    alignment = LineHeightStyle.Alignment.Center,
+                    trim = LineHeightStyle.Trim.Both
+                )
+            ),
+            modifier = Modifier.padding(horizontal = 6.dp, vertical = 2.dp)
+        )
+    }
+}
+
+/** Elapsed fraction of the pass. Collects the clock itself to keep ticks off the text rows. */
+@Composable
+private fun PassProgressBar(pass: OrbitalPass, timeNow: StateFlow<Long>, modifier: Modifier = Modifier) {
+    val now by timeNow.collectAsStateWithLifecycle()
+    LinearProgressIndicator(
+        progress = { pass.progressAt(now) },
+        drawStopIndicator = {},
+        modifier = modifier
+    )
 }
 
 @Composable
 private fun PassItem(
     pass: OrbitalPass,
     navigateToRadar: (Int, Long) -> Unit,
+    timeNow: StateFlow<Long>,
     modifier: Modifier = Modifier,
     isVerticalLayout: Boolean = true,
     isUtc: Boolean = false
 ) {
     val passSatId = stringResource(id = R.string.pass_satId, pass.catNum)
-    val horizontalPadding = if (isVerticalLayout) 6.dp else 10.dp
+    val horizontalPadding = if (isVerticalLayout) 6.dp else 12.dp
     val timeZone = remember(isUtc) {
         if (isUtc) TimeZone.getTimeZone("UTC") else TimeZone.getDefault()
     }
     val sdfTime = remember(isUtc) {
         SimpleDateFormat("HH:mm:ss", displayLocale()).also { it.timeZone = timeZone }
     }
+    val azimuthFormat = stringResource(id = R.string.pass_azimuth)
     val aosTimeStr = remember(pass.aosTime, isUtc) { sdfTime.format(Date(pass.aosTime)) }
     val losTimeStr = remember(pass.losTime, isUtc) { sdfTime.format(Date(pass.losTime)) }
+    val aosAzStr = remember(pass.aosAzimuth, azimuthFormat) {
+        String.format(displayLocale(), azimuthFormat, pass.aosAzimuth.toInt() % 360)
+    }
+    val losAzStr = remember(pass.losAzimuth, azimuthFormat) {
+        String.format(displayLocale(), azimuthFormat, pass.losAzimuth.toInt() % 360)
+    }
     val durationStr = remember(pass.aosTime, pass.losTime) {
         val seconds = (pass.losTime - pass.aosTime) / 1000
         "${seconds / 60}m ${seconds % 60}s"
     }
+//    do not delete
+//    val progressTint = MaterialTheme.colorScheme.secondary.copy(alpha = 0.08f)
+//    val progressFraction = if (pass.isDeepSpace) 0f else pass.progress.coerceIn(0f, 1f)
 
     Column(
         modifier = modifier.clickable { navigateToRadar(pass.catNum, pass.aosTime) }
     ) {
         Column(
-            verticalArrangement = Arrangement.spacedBy(1.dp),
+            verticalArrangement = Arrangement.spacedBy(4.dp),
             modifier = Modifier
                 .fillMaxWidth()
                 .background(color = MaterialTheme.colorScheme.surface)
-                .padding(horizontal = horizontalPadding, vertical = 4.dp)
+//                do not delete
+//                .drawBehind { drawRect(progressTint, size = Size(size.width * progressFraction, size.height)) }
+                .padding(horizontal = horizontalPadding, vertical = 6.dp)
         ) {
             Row(verticalAlignment = Alignment.CenterVertically) {
                 Text(
@@ -350,84 +422,88 @@ private fun PassItem(
                     overflow = TextOverflow.Ellipsis,
                     color = MaterialTheme.colorScheme.onSurface
                 )
-                val elevColor = elevationColor(pass.maxElevation)
-                Icon(
-                    painter = painterResource(id = R.drawable.ic_elevation),
-                    contentDescription = null,
-                    tint = elevColor,
-                    modifier = Modifier.size(16.dp)
-                )
-                Spacer(modifier = Modifier.width(4.dp))
-                Text(
-                    text = "${pass.maxElevation}°",
-                    color = elevColor
-                )
+                PassTimerChip(pass = pass, timeNow = timeNow)
             }
             Row(
                 verticalAlignment = Alignment.CenterVertically,
-                horizontalArrangement = Arrangement.SpaceBetween,
                 modifier = Modifier.fillMaxWidth()
             ) {
-                Row(
-                    modifier = Modifier.weight(1f),
-                    horizontalArrangement = Arrangement.Start,
-                    verticalAlignment = Alignment.CenterVertically
-                ) {
-                    if (pass.isDeepSpace) {
-                        Text(
-                            text = stringResource(R.string.pass_deep_space),
-                            fontSize = 15.sp,
-                            color = MaterialTheme.colorScheme.onSurface
-                        )
+                Text(
+                    text = if (pass.isDeepSpace) {
+                        stringResource(R.string.pass_duration_placeholder)
                     } else {
-                        Text(text = durationStr, fontSize = 15.sp, color = MaterialTheme.colorScheme.onSurface)
-                    }
-                }
+                        durationStr
+                    },
+                    fontSize = 15.sp,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                    color = MaterialTheme.colorScheme.onSurface,
+                    modifier = Modifier.weight(1f)
+                )
+                // AOS azimuth, peak elevation and LOS azimuth read as the arc of the pass
                 Row(
-                    modifier = Modifier.weight(1f),
-                    horizontalArrangement = Arrangement.Center,
-                    verticalAlignment = Alignment.CenterVertically
-                ) {
-                    Text(text = "${pass.altitude} km", fontSize = 15.sp, color = MaterialTheme.colorScheme.onSurface)
-                }
-                Row(
-                    modifier = Modifier.weight(1f),
-                    horizontalArrangement = Arrangement.End,
+                    horizontalArrangement = Arrangement.spacedBy(10.dp),
                     verticalAlignment = Alignment.CenterVertically
                 ) {
                     Text(
-                        text = stringResource(
-                            id = R.string.pass_aosLos,
-                            pass.aosAzimuth.toInt(),
-                            pass.losAzimuth.toInt()
-                        ),
+                        text = aosAzStr,
+                        fontSize = 15.sp,
+                        color = MaterialTheme.colorScheme.onSurface
+                    )
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        val elevColor = elevationColor(pass.maxElevation)
+                        Icon(
+                            painter = painterResource(id = R.drawable.ic_elevation),
+                            contentDescription = null,
+                            tint = elevColor,
+                            modifier = Modifier.size(16.dp)
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text(
+                            text = "${pass.maxElevation}°",
+                            color = elevColor
+                        )
+                    }
+                    Text(
+                        text = losAzStr,
+                        fontSize = 15.sp,
+                        color = MaterialTheme.colorScheme.onSurface
+                    )
+                }
+                Text(
+                    text = "${pass.altitude} km",
+                    fontSize = 15.sp,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                    color = MaterialTheme.colorScheme.onSurface,
+                    textAlign = TextAlign.End,
+                    modifier = Modifier.weight(1f)
+                )
+            }
+            // A DeepSpace object has no AOS/LOS to count between, so it drops the progress row
+            if (!pass.isDeepSpace) {
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    modifier = Modifier.fillMaxWidth()
+                ) {
+                    Text(
+                        text = aosTimeStr,
+                        fontSize = 15.sp,
+                        color = MaterialTheme.colorScheme.onSurface
+                    )
+                    PassProgressBar(
+                        pass = pass,
+                        timeNow = timeNow,
+                        modifier = Modifier.fillMaxWidth(0.75f)
+                    )
+                    Text(
+                        text = losTimeStr,
                         fontSize = 15.sp,
                         color = MaterialTheme.colorScheme.onSurface
                     )
                 }
             }
-            Row(
-                verticalAlignment = Alignment.CenterVertically,
-                horizontalArrangement = Arrangement.SpaceBetween,
-                modifier = Modifier.fillMaxWidth()
-            ) {
-                val defaultTime = "   - - : - -   "
-                Text(
-                    text = if (pass.isDeepSpace) defaultTime else aosTimeStr,
-                    fontSize = 15.sp,
-                    color = MaterialTheme.colorScheme.onSurface
-                )
-                LinearProgressIndicator(
-                    progress = { if (pass.isDeepSpace) 100f else pass.progress },
-                    drawStopIndicator = {},
-                    modifier = Modifier.fillMaxWidth(0.75f)
-                )
-                Text(
-                    text = if (pass.isDeepSpace) defaultTime else losTimeStr,
-                    fontSize = 15.sp,
-                    color = MaterialTheme.colorScheme.onSurface
-                )
-            }
         }
         HorizontalDivider(thickness = 2.dp, color = MaterialTheme.colorScheme.background)
     }

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

@@ -25,8 +25,7 @@ data class PassesState(
     val isRefreshing: Boolean = true,
     val isUtc: Boolean = false,
     val nextPass: OrbitalPass,
-    val nextTime: String = "00:00:00",
-    val isNextTimeAos: Boolean = true,
+    val searchQuery: String = "",
     val hours: Int = 24,
     val elevation: Double = 16.0,
     val lowElevation: Double = 16.0,
@@ -39,8 +38,7 @@ data class PassesState(
     val itemsList: List<OrbitalPass> = emptyList(),
     val groupedPasses: Map<String, List<OrbitalPass>> = emptyMap(),
     val shouldSeeWhatsNew: Boolean = false,
-    val sunTimes: Map<String, Pair<String, String>> = emptyMap(),
-    val focusedCatNum: Int? = null
+    val sunTimes: Map<String, Pair<String, String>> = emptyMap()
 )
 
 sealed interface PassesAction {
@@ -59,6 +57,5 @@ sealed interface PassesAction {
     data object RefreshPasses : PassesAction
     data object TogglePassesDialog : PassesAction
     data object ToggleRadiosDialog : PassesAction
-    data class FocusCatNum(val catNum: Int) : PassesAction
-    data object ClearFocus : PassesAction
+    data class SearchFor(val query: String) : PassesAction
 }

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

@@ -27,8 +27,6 @@ import com.rtbishop.look4sat.core.domain.predict.OrbitalPass
 import com.rtbishop.look4sat.core.domain.repository.IMainContainer
 import com.rtbishop.look4sat.core.domain.repository.ISatelliteRepo
 import com.rtbishop.look4sat.core.domain.repository.ISettingsRepo
-import com.rtbishop.look4sat.core.domain.utility.round
-import com.rtbishop.look4sat.core.domain.utility.toTimerString
 import com.rtbishop.look4sat.core.presentation.getDefaultPass
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -46,6 +44,14 @@ import java.util.Locale
 import java.util.TimeZone
 import kotlin.time.Duration.Companion.milliseconds
 
+/** Inputs that together determine the visible pass list; a change in any one regroups it. */
+private data class PassesInput(
+    val passes: List<OrbitalPass>,
+    val isUtc: Boolean,
+    val showDeepSpace: Boolean,
+    val query: String
+)
+
 class PassesViewModel(
     private val satelliteRepo: ISatelliteRepo,
     private val settingsRepo: ISettingsRepo
@@ -70,6 +76,16 @@ class PassesViewModel(
     )
     val uiState: StateFlow<PassesState> = _uiState
 
+    private val _timeNow = MutableStateFlow(System.currentTimeMillis())
+
+    private val searchQuery = MutableStateFlow("")
+
+    /**
+     * Ticks once per second, kept separate from [uiState] so that a clock update only
+     * recomposes the countdown chips and progress bars instead of the whole screen.
+     */
+    val timeNow: StateFlow<Long> = _timeNow
+
     init {
         // Refresh indicator: mirrors the repo's isCalculating state
         viewModelScope.launch {
@@ -95,36 +111,50 @@ class PassesViewModel(
                 _uiState.update { it.copy(modes = modes) }
             }
         }
-        // Tick loop: restarts on passes change, UTC/DeepSpace changes. Grouping/sun-time
-        // computations run once per restart, progress/countdown are calculated every second.
+        // Tick loop, gated on having an observer so it stops while the screen is in the
+        // background. Restarts on passes, UTC or DeepSpace changes. Sun times and grouping are
+        // computed only when the pass list itself changes; the clock alone never rebuilds them.
         viewModelScope.launch {
-            combine(
-                satelliteRepo.passes,
-                settingsRepo.otherSettings.map { it.stateOfUtc }.distinctUntilChanged(),
-                settingsRepo.passesSettings.map { it.showDeepSpace }.distinctUntilChanged()
-            ) { passes, isUtc, showDeepSpace -> Triple(passes, isUtc, showDeepSpace) }
-                .collectLatest { (allPasses, isUtc, showDeepSpace) ->
-                    val filtered = if (showDeepSpace) allPasses
-                    else allPasses.filter { !it.isDeepSpace }
-                    // Expensive: recompute sun times once per items/UTC change, not every second
-                    val sunTimes = computeSunTimes(filtered, isUtc)
-                    _uiState.update { it.copy(sunTimes = sunTimes) }
-                    while (isActive) {
-                        val timeNow = System.currentTimeMillis()
-                        val processed = computePassProgress(filtered, timeNow)
-                        val grouped = groupPasses(processed, isUtc)
-                        val (nextPass, nextTime, isAos) = resolveNextPass(processed, timeNow)
-                        _uiState.update {
-                            it.copy(
-                                itemsList = processed,
-                                groupedPasses = grouped,
-                                nextPass = nextPass,
-                                nextTime = nextTime,
-                                isNextTimeAos = isAos
-                            )
-                        }
-                        delay(1000.milliseconds)
+            _uiState.subscriptionCount
+                .map { count -> count > 0 }
+                .distinctUntilChanged()
+                .collectLatest { isObserved ->
+                    if (!isObserved) return@collectLatest
+                    combine(
+                        satelliteRepo.passes,
+                        settingsRepo.otherSettings.map { it.stateOfUtc }.distinctUntilChanged(),
+                        settingsRepo.passesSettings.map { it.showDeepSpace }.distinctUntilChanged(),
+                        searchQuery
+                    ) { passes, isUtc, showDeepSpace, query ->
+                        PassesInput(passes, isUtc, showDeepSpace, query)
                     }
+                        .collectLatest { (allPasses, isUtc, showDeepSpace, query) ->
+                            val filtered = filterByQuery(
+                                if (showDeepSpace) allPasses else allPasses.filter { !it.isDeepSpace },
+                                query
+                            )
+                            val sunTimes = computeSunTimes(filtered, isUtc)
+                            var live: List<OrbitalPass>? = null
+                            while (isActive) {
+                                val timeNow = System.currentTimeMillis()
+                                _timeNow.value = timeNow
+                                val current = filtered.filter { it.isDeepSpace || timeNow < it.losTime }
+                                // Only a pass dropping off the list warrants a regroup
+                                if (live == null || current.size != live.size) {
+                                    live = current
+                                    _uiState.update {
+                                        it.copy(
+                                            itemsList = current,
+                                            groupedPasses = groupPasses(current, isUtc),
+                                            sunTimes = sunTimes
+                                        )
+                                    }
+                                }
+                                val nextPass = resolveNextPass(current, timeNow)
+                                _uiState.update { it.copy(nextPass = nextPass) }
+                                delay(1000.milliseconds)
+                            }
+                        }
                 }
         }
     }
@@ -149,8 +179,10 @@ class PassesViewModel(
                 _uiState.update { it.copy(isPassesDialogShown = !it.isPassesDialogShown) }
             PassesAction.ToggleRadiosDialog ->
                 _uiState.update { it.copy(isRadiosDialogShown = !it.isRadiosDialogShown) }
-            is PassesAction.FocusCatNum -> _uiState.update { it.copy(focusedCatNum = action.catNum) }
-            PassesAction.ClearFocus -> _uiState.update { it.copy(focusedCatNum = null) }
+            is PassesAction.SearchFor -> {
+                searchQuery.value = action.query
+                _uiState.update { it.copy(searchQuery = action.query) }
+            }
         }
     }
 
@@ -208,43 +240,34 @@ class PassesViewModel(
         return ordered
     }
 
-    /** Computes live progress for each pass, filtering out expired ones. */
-    private fun computePassProgress(passList: List<OrbitalPass>, time: Long): List<OrbitalPass> {
-        val result = ArrayList<OrbitalPass>(passList.size)
-        for (pass in passList) {
-            if (!pass.isDeepSpace && time > pass.aosTime) {
-                val deltaNow = time.minus(pass.aosTime).toFloat()
-                val deltaTotal = pass.losTime.minus(pass.aosTime).toFloat()
-                val newProgress = (deltaNow / deltaTotal).round(2)
-                if (newProgress >= 1.0f) continue
-                if (newProgress != pass.progress) {
-                    result.add(pass.copy(progress = newProgress))
-                } else {
-                    result.add(pass)
-                }
-            } else {
-                result.add(pass)
-            }
-        }
-        return result
+    /** Resolves the next upcoming pass, falling back to the one currently in progress. */
+    private fun resolveNextPass(passes: List<OrbitalPass>, timeNow: Long): OrbitalPass {
+        val upcoming = passes.firstOrNull { it.aosTime > timeNow }
+        if (upcoming != null) return upcoming
+        return passes.lastOrNull() ?: defaultPass
     }
 
-    /** Resolves the next upcoming or active pass and its countdown timer. */
-    private fun resolveNextPass(
-        passes: List<OrbitalPass>,
-        timeNow: Long
-    ): Triple<OrbitalPass, String, Boolean> {
-        val upcoming = passes.firstOrNull { it.aosTime > timeNow }
-        if (upcoming != null) {
-            return Triple(upcoming, (upcoming.aosTime - timeNow).toTimerString(), true)
+    /**
+     * Filters passes by query, mirroring the satellite search: a numeric query matches the
+     * catalog number, otherwise every space-separated token must appear in the name once both
+     * sides are normalized, so "ao7" matches "AO-7 (AMSAT-OSCAR 7)".
+     */
+    private fun filterByQuery(passes: List<OrbitalPass>, query: String): List<OrbitalPass> {
+        if (query.isBlank()) return passes
+        val catNum = query.trim().toIntOrNull()
+        if (catNum != null) return passes.filter { it.catNum == catNum }
+        val tokens = query.split(' ').map { normalizeForSearch(it) }.filter { it.isNotEmpty() }
+        if (tokens.isEmpty()) return passes
+        return passes.filter { pass ->
+            val normalizedName = normalizeForSearch(pass.name)
+            tokens.all { normalizedName.contains(it) }
         }
-        if (passes.isNotEmpty()) {
-            val lastPass = passes.last()
-            return Triple(lastPass, (lastPass.losTime - timeNow).toTimerString(), false)
-        }
-        return Triple(defaultPass, "00:00:00", true)
     }
 
+    /** Lowercases and strips all non-alphanumeric chars for fuzzy matching. */
+    private fun normalizeForSearch(text: String): String =
+        text.lowercase().filter { it.isLetterOrDigit() }
+
     private fun applyFilter(
         hoursAhead: Int,
         minElevation: Double,

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

@@ -101,4 +101,11 @@ sealed interface RadarAction {
 
     // Calculator actions
     data class ChangeCalculatorOffset(val offsetKHz: String) : RadarAction
+
+    /**
+     * The transponder currently driving the calculator (null when the satellite has
+     * no linear transponder). The per-satellite offset follows it instead of the
+     * transceiver selection, so it loads and saves even when nothing is selected.
+     */
+    data class CalculatorTransponderChanged(val catnum: Int?) : RadarAction
 }

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

@@ -70,6 +70,7 @@ class RadarViewModel(
     private var compassOffset = settingsRepo.otherSettings.value.radarCompassOffset
     private var compassOffsetElev = settingsRepo.otherSettings.value.radarCompassOffsetElev
     private var transponders: List<SatRadio> = emptyList()
+    private var calculatorCatnum: Int? = null
     private var sstvDecoder: SstvDecoder? = null
     private var sstvRecordingJob: Job? = null
     private var sensorCollectionJob: Job? = null
@@ -260,16 +261,8 @@ class RadarViewModel(
                 // Compute toggle state before the update so we don't read post-update value
                 val isTogglingOff = _uiState.value.transceivers.selectedUuid == action.uuid
                 val newUuid = if (isTogglingOff) null else action.uuid
-                // Load the saved offset for the newly selected satellite
-                val offsetKHz = if (!isTogglingOff) {
-                    transponders.find { it.uuid == action.uuid }
-                        ?.catnum?.let { settingsRepo.getSatelliteOffset(it) } ?: ""
-                } else ""
                 _uiState.update {
-                    it.copy(
-                        transceivers = it.transceivers.copy(selectedUuid = newUuid),
-                        calculatorOffsetKHz = offsetKHz
-                    )
+                    it.copy(transceivers = it.transceivers.copy(selectedUuid = newUuid))
                 }
                 // Only update the tracking service when selecting a different transponder to
                 // avoid resetting a user-adjusted TX base on re-expand
@@ -320,7 +313,9 @@ class RadarViewModel(
                 _uiState.update { it.copy(sstv = it.sstv.copy(currentFrame = null)) }
             }
             is RadarAction.ChangeCalculatorOffset -> {
-                val catnum = _uiState.value.transceivers.selectedUuid?.let { uuid ->
+                // Keyed by the transponder driving the calculator, so the offset saves
+                // even when no transceiver is selected (or selection was toggled off)
+                val catnum = calculatorCatnum ?: _uiState.value.transceivers.selectedUuid?.let { uuid ->
                     transponders.find { it.uuid == uuid }?.catnum
                 }
                 if (catnum != null) {
@@ -328,6 +323,11 @@ class RadarViewModel(
                 }
                 _uiState.update { it.copy(calculatorOffsetKHz = action.offsetKHz) }
             }
+            is RadarAction.CalculatorTransponderChanged -> {
+                calculatorCatnum = action.catnum
+                val offsetKHz = action.catnum?.let { settingsRepo.getSatelliteOffset(it) } ?: ""
+                _uiState.update { it.copy(calculatorOffsetKHz = offsetKHz) }
+            }
         }
     }
 

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

@@ -140,6 +140,13 @@ fun CalculatorPage(
             ?: calculatorTransceivers.firstOrNull()
     }
 
+    // Keep the per-satellite offset in sync with the transponder driving the
+    // calculator: load the saved value on open/satellite change, and remember
+    // its catnum so editing saves even when no transceiver is selected
+    LaunchedEffect(selectedTransceiver?.uuid) {
+        onAction(RadarAction.CalculatorTransponderChanged(selectedTransceiver?.catnum))
+    }
+
     if (selectedTransceiver == null) {
         EmptyTransceiversContent(modifier)
         return

feature/satellites/src/main/java/com/rtbishop/look4sat/feature/satellites/SatellitesScreen.kt

@@ -30,26 +30,20 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.items
-import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.material3.Checkbox
 import androidx.compose.material3.ElevatedCard
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.semantics
-import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
@@ -67,6 +61,7 @@ import com.rtbishop.look4sat.core.presentation.LocalSpacing
 import com.rtbishop.look4sat.core.presentation.MainTheme
 import com.rtbishop.look4sat.core.presentation.PrimaryIconCard
 import com.rtbishop.look4sat.core.presentation.R
+import com.rtbishop.look4sat.core.presentation.SearchBar
 import com.rtbishop.look4sat.core.presentation.TopBar
 import com.rtbishop.look4sat.core.presentation.infiniteMarquee
 import com.rtbishop.look4sat.core.presentation.isVerticalLayout
@@ -191,55 +186,6 @@ private fun SatellitesScreen(
     }
 }
 
-@Composable
-private fun SearchBar(onQueryChange: (String) -> Unit, modifier: Modifier = Modifier) {
-    val currentQuery = rememberSaveable { mutableStateOf("") }
-    val updateQuery = { newValue: String ->
-        currentQuery.value = newValue
-        onQueryChange(newValue)
-    }
-    ElevatedCard(modifier = modifier.height(48.dp)) {
-        Row(
-            horizontalArrangement = Arrangement.Start,
-            verticalAlignment = Alignment.CenterVertically,
-            modifier = Modifier.padding(start = 12.dp)
-        ) {
-            Icon(painter = painterResource(id = R.drawable.ic_search), contentDescription = null)
-            BasicTextField(
-                value = currentQuery.value,
-                onValueChange = updateQuery,
-                singleLine = true,
-                modifier = Modifier
-                    .weight(1f)
-                    .padding(start = 12.dp),
-                textStyle = TextStyle(
-                    fontSize = 16.sp,
-                    lineHeight = 20.sp,
-                    fontWeight = FontWeight.Medium,
-                    color = MaterialTheme.colorScheme.onSurface
-                ),
-                decorationBox = { innerTextField ->
-                    if (currentQuery.value.isEmpty()) {
-                        Text(
-                            text = stringResource(id = R.string.sat_search_hint),
-                            fontSize = 16.sp,
-                            lineHeight = 20.sp,
-                            fontWeight = FontWeight.Medium,
-                            color = MaterialTheme.colorScheme.onSurface
-                        )
-                    }
-                    innerTextField()
-                },
-                cursorBrush = SolidColor(MaterialTheme.colorScheme.onSurface)
-            )
-            IconButton(onClick = { updateQuery("") }) {
-                val clearCd = stringResource(R.string.sat_search_clear)
-                Icon(painter = painterResource(id = R.drawable.ic_close), contentDescription = clearCd)
-            }
-        }
-    }
-}
-
 @Composable
 private fun ModeCard(modes: List<String>, onClick: () -> Unit, modifier: Modifier = Modifier) {
     val modesText = if (modes.isEmpty()) "All" else modes.joinToString(", ")
@@ -372,5 +318,3 @@ private fun SummaryHeader(selectedText: String, availableText: String) {
         )
     }
 }
-
-

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

@@ -495,17 +495,31 @@ private fun OtherCard(settings: OtherSettings, onAction: (SettingsAction) -> Uni
                 color = MaterialTheme.colorScheme.primary
             )
             Spacer(modifier = Modifier.height(4.dp))
-            // Display preferences: UTC clock + night filter
+            // Data preferences: auto-update + UTC clock
             Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                SwitchTile(R.string.prefs_other_switch_update, settings.stateOfAutoUpdate) {
+                    onAction(SettingsAction.ToggleUpdate(it))
+                }
                 SwitchTile(R.string.prefs_other_switch_utc, settings.stateOfUtc) {
                     onAction(SettingsAction.ToggleUtc(it))
                 }
-                SwitchTile(R.string.prefs_other_switch_night_mode, settings.stateOfNightMode) {
+            }
+            Spacer(modifier = Modifier.height(4.dp))
+            // Appearance: light theme + night filter
+            Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                SwitchTile(R.string.prefs_other_switch_light_theme, settings.stateOfLightTheme) {
+                    onAction(SettingsAction.ToggleLightTheme(it))
+                }
+                SwitchTile(
+                    R.string.prefs_other_switch_night_mode,
+                    settings.stateOfNightMode,
+                    enabled = !settings.stateOfLightTheme
+                ) {
                     onAction(SettingsAction.ToggleNightMode(it))
                 }
             }
             Spacer(modifier = Modifier.height(4.dp))
-            // Radar behavior: sweep animation + sensor control
+            // Radar behavior: sweep animation + sensors, followed by the compass offset sliders
             Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                 SwitchTile(R.string.prefs_other_switch_sweep, settings.stateOfSweep) {
                     onAction(SettingsAction.ToggleSweep(it))
@@ -515,14 +529,9 @@ private fun OtherCard(settings: OtherSettings, onAction: (SettingsAction) -> Uni
                 }
             }
             Spacer(modifier = Modifier.height(4.dp))
-            // Data management (full width)
-            SwitchRow(R.string.prefs_other_switch_update, settings.stateOfAutoUpdate) {
-                onAction(SettingsAction.ToggleUpdate(it))
-            }
-            Spacer(modifier = Modifier.height(4.dp))
             // Compass calibration sliders at the bottom
             CompassOffsetRow(
-                labelResId = R.string.prefs_other_compass_offset,
+                labelResId = R.string.prefs_other_compass_offset_az,
                 value = settings.radarCompassOffset,
                 range = -180f..180f
             ) { onAction(SettingsAction.SetRadarCompassOffset(it)) }
@@ -549,7 +558,14 @@ private fun CompassOffsetRow(
         verticalAlignment = Alignment.CenterVertically,
         modifier = Modifier.fillMaxWidth()
     ) {
-        Text(text = stringResource(id = labelResId))
+        Text(
+            text = stringResource(id = labelResId),
+            modifier = Modifier
+                .weight(1f)
+                .padding(end = 4.dp)
+                .infiniteMarquee(),
+            maxLines = 1
+        )
         Text(text = "${value.toInt()}°")
     }
     Spacer(modifier = Modifier.height(4.dp))
@@ -561,19 +577,12 @@ private fun CompassOffsetRow(
 }
 
 @Composable
-private fun SwitchRow(labelResId: Int, checked: Boolean, onCheckedChange: (Boolean) -> Unit) {
-    Row(
-        horizontalArrangement = Arrangement.SpaceBetween,
-        verticalAlignment = Alignment.CenterVertically,
-        modifier = Modifier.fillMaxWidth()
-    ) {
-        Text(text = stringResource(id = labelResId))
-        Switch(checked = checked, onCheckedChange = onCheckedChange)
-    }
-}
-
-@Composable
-private fun RowScope.SwitchTile(labelResId: Int, checked: Boolean, onCheckedChange: (Boolean) -> Unit) {
+private fun RowScope.SwitchTile(
+    labelResId: Int,
+    checked: Boolean,
+    enabled: Boolean = true,
+    onCheckedChange: (Boolean) -> Unit
+) {
     Row(
         horizontalArrangement = Arrangement.SpaceBetween,
         verticalAlignment = Alignment.CenterVertically,
@@ -581,9 +590,13 @@ private fun RowScope.SwitchTile(labelResId: Int, checked: Boolean, onCheckedChan
     ) {
         Text(
             text = stringResource(id = labelResId),
-            modifier = Modifier.weight(1f)
+            modifier = Modifier
+                .weight(1f)
+                .padding(end = 4.dp)
+                .infiniteMarquee(),
+            maxLines = 1
         )
-        Switch(checked = checked, onCheckedChange = onCheckedChange)
+        Switch(checked = checked, enabled = enabled, onCheckedChange = onCheckedChange)
     }
 }
 

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

@@ -127,7 +127,10 @@ class SettingsViewModel(
             is SettingsAction.ToggleUpdate -> settingsRepo.updateOtherSettings { it.copy(stateOfAutoUpdate = action.value) }
             is SettingsAction.ToggleSweep -> settingsRepo.updateOtherSettings { it.copy(stateOfSweep = action.value) }
             is SettingsAction.ToggleSensor -> settingsRepo.updateOtherSettings { it.copy(stateOfSensors = action.value) }
-            is SettingsAction.ToggleLightTheme -> settingsRepo.updateOtherSettings { it.copy(stateOfLightTheme = action.value) }
+            is SettingsAction.ToggleLightTheme -> settingsRepo.updateOtherSettings {
+                // Night filter (red-only overlay) is incompatible with the light theme, so turn it off.
+                it.copy(stateOfLightTheme = action.value, stateOfNightMode = if (action.value) false else it.stateOfNightMode)
+            }
             is SettingsAction.ToggleNightMode -> settingsRepo.updateOtherSettings { it.copy(stateOfNightMode = action.value) }
             is SettingsAction.SetRadarCompassOffset -> settingsRepo.updateOtherSettings { it.copy(radarCompassOffset = action.value) }
             is SettingsAction.SetRadarCompassOffsetElev -> settingsRepo.updateOtherSettings { it.copy(radarCompassOffsetElev = action.value) }

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 #noinspection UnusedVersionCatalogEntry
-appVersionCode = "447"
+appVersionCode = "448"
 #noinspection UnusedVersionCatalogEntry
-appVersionName = "4.4.7"
+appVersionName = "4.4.8"
 #noinspection UnusedVersionCatalogEntry
 compileSdk = "37"
 #noinspection UnusedVersionCatalogEntry
@@ -12,16 +12,16 @@ jdkVersion = "21"
 #noinspection UnusedVersionCatalogEntry
 packageName = "com.rtbishop.look4sat"
 
-android-gradle-plugin = "9.4.0"
+android-gradle-plugin = "9.4.1"
 
-androidx-core-ktx = "1.19.0"
+androidx-core-ktx = "1.19.1"
 androidx-core-splashscreen = "1.2.0"
 androidx-room = "2.8.5"
 
 compose-bom = "2026.09.00"
 compose-activity = "1.13.0"
 compose-lifecycle = "2.11.0"
-compose-navigation3 = "1.1.7"
+compose-navigation3 = "1.2.0"
 
 google-ksp = "2.3.11"
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,7 +1,7 @@
-#Sat Sep 12 11:29:59 BST 2026
+#Sun Sep 27 11:54:01 BST 2026
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.7.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.8.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME