diff --git a/README.md b/README.md
index 61466aee..198b5a0d 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@
 
 **BA7OPF 定制版** — 基于 [rt-bishop/Look4Sat](https://github.com/rt-bishop/Look4Sat) 的业余无线电卫星追踪器，增加了线性卫星频率计算器等功能。
 
+非官方修改版（fork），独立维护；首次发布 2026-09，持续修改中。
+
 ## 本仓库特色功能
 
 - **网格地图模式（Grid Mode）** — 地图页内置 VUCC 网格覆盖图：已通联网格绿色填充、漫游网格蓝色 45° 斜纹（疏朗半透明样式）、当前所在方格淡黄加粗框；点击已通联网格弹出该网格内通联明细弹窗；进入网格模式默认 VUCC 视图
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 58745973..87c49991 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -44,7 +44,7 @@
 
         <meta-data
             android:name="android.telephony.PROPERTY_SATELLITE_DATA_OPTIMIZED"
-            android:value="com.rtbishop.look4sat" />
+            android:value="cn.ba7opf.look4sat" />
 
         <provider
             android:name="androidx.core.content.FileProvider"
diff --git a/app/src/main/java/com/rtbishop/look4sat/MainActivity.kt b/app/src/main/java/com/rtbishop/look4sat/MainActivity.kt
index 80913a63..a2bd84f3 100644
--- a/app/src/main/java/com/rtbishop/look4sat/MainActivity.kt
+++ b/app/src/main/java/com/rtbishop/look4sat/MainActivity.kt
@@ -27,7 +27,9 @@ import android.view.View
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.runtime.getValue
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.lifecycleScope
 import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
 import com.rtbishop.look4sat.core.presentation.MainTheme
@@ -47,9 +49,12 @@ class MainActivity : ComponentActivity() {
         installSplashScreen()
         enableEdgeToEdge()
         super.onCreate(savedInstanceState)
+        val settingsRepo = (applicationContext as IContainerProvider).getMainContainer().settingsRepo
         observeNightFilterState()
         setContent {
-            MainTheme(isDarkTheme = true) { NavRoot() }
+            val otherSettings by settingsRepo.otherSettings.collectAsStateWithLifecycle()
+            // Light theme is opt-in: the app stays dark until the user turns it on.
+            MainTheme(isDarkTheme = !otherSettings.stateOfLightTheme) { NavRoot() }
         }
     }
 
diff --git a/core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/UpdateRepository.kt b/core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/UpdateRepository.kt
index b476bd8e..0f81ed79 100644
--- a/core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/UpdateRepository.kt
+++ b/core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/UpdateRepository.kt
@@ -1,3 +1,21 @@
+/*
+ * Look4Sat-BA7OPF. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2026 BA7OPF.
+ * Based on Look4Sat by Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.rtbishop.look4sat.core.data.repository
 
 import com.rtbishop.look4sat.core.domain.model.LatestRelease
diff --git a/core/data/src/main/java/com/rtbishop/look4sat/core/data/usecase/AddToCalendar.kt b/core/data/src/main/java/com/rtbishop/look4sat/core/data/usecase/AddToCalendar.kt
index 3dbbca35..2db784a8 100644
--- a/core/data/src/main/java/com/rtbishop/look4sat/core/data/usecase/AddToCalendar.kt
+++ b/core/data/src/main/java/com/rtbishop/look4sat/core/data/usecase/AddToCalendar.kt
@@ -29,7 +29,7 @@ class AddToCalendar(private val context: Context) : IAddToCalendar {
             addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
             setData(CalendarContract.Events.CONTENT_URI)
             putExtra(CalendarContract.Events.TITLE, name)
-            putExtra(CalendarContract.Events.DESCRIPTION, "Look4Sat Pass")
+            putExtra(CalendarContract.Events.DESCRIPTION, "Look4Sat-BA7OPF Pass")
             putExtra(CalendarContract.EXTRA_EVENT_BEGIN_TIME, aosTime)
             putExtra(CalendarContract.EXTRA_EVENT_END_TIME, losTime)
         }
diff --git a/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/GridTargetChip.kt b/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/GridTargetChip.kt
index de56f9ff..f3e531b7 100644
--- a/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/GridTargetChip.kt
+++ b/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/GridTargetChip.kt
@@ -1,3 +1,21 @@
+/*
+ * Look4Sat-BA7OPF. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2026 BA7OPF.
+ * Based on Look4Sat by Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.rtbishop.look4sat.core.presentation
 
 import androidx.compose.foundation.Canvas
diff --git a/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/MainTheme.kt b/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/MainTheme.kt
index 80f4ade9..64979673 100644
--- a/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/MainTheme.kt
+++ b/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/MainTheme.kt
@@ -61,8 +61,9 @@ 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
+                // Light theme needs dark status/nav bar icons; the dark theme needs light ones.
+                insetsController.isAppearanceLightStatusBars = !isDarkTheme
+                insetsController.isAppearanceLightNavigationBars = !isDarkTheme
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                     window.isNavigationBarContrastEnforced = false
                 }
diff --git a/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/SwipeableItem.kt b/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/SwipeableItem.kt
index 5e6f448e..f63ac50b 100644
--- a/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/SwipeableItem.kt
+++ b/core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/SwipeableItem.kt
@@ -1,3 +1,21 @@
+/*
+ * Look4Sat-BA7OPF. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2026 BA7OPF.
+ * Based on Look4Sat by Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.rtbishop.look4sat.core.presentation
 
 import androidx.compose.animation.core.animateDpAsState
diff --git a/core/presentation/src/main/res/values-es/strings.xml b/core/presentation/src/main/res/values-es/strings.xml
index 61e3a2c3..81501d38 100644
--- a/core/presentation/src/main/res/values-es/strings.xml
+++ b/core/presentation/src/main/res/values-es/strings.xml
@@ -83,7 +83,6 @@
     <string name="map_visible">Visible</string>
 
     <!-- Settings screen -->
-    <string name="prefs_donate_title">Soporte</string>
     <string name="prefs_privacy_title">Política de privacidad</string>
 
     <string name="prefs_updated_title">Actualizado: %s</string>
diff --git a/core/presentation/src/main/res/values-ru/strings.xml b/core/presentation/src/main/res/values-ru/strings.xml
index a0b44882..e3b5b867 100644
--- a/core/presentation/src/main/res/values-ru/strings.xml
+++ b/core/presentation/src/main/res/values-ru/strings.xml
@@ -82,7 +82,6 @@
     <string name="map_visible">Видимый</string>
 
     <!-- Settings screen -->
-    <string name="prefs_donate_title">Поддержать</string>
     <string name="prefs_privacy_title">Политика конфиденциальности</string>
 
     <string name="prefs_updated_title">Обновлено: %s</string>
diff --git a/core/presentation/src/main/res/values-si/strings.xml b/core/presentation/src/main/res/values-si/strings.xml
index fd8acb18..ffd7b92c 100644
--- a/core/presentation/src/main/res/values-si/strings.xml
+++ b/core/presentation/src/main/res/values-si/strings.xml
@@ -83,7 +83,6 @@
     <string name="map_visible">දෘශ්‍ය</string>
 
     <!-- Settings screen -->
-    <string name="prefs_donate_title">දායකත්ව</string>
     <string name="prefs_privacy_title">රහස්යතා ප්රතිපත්තිය</string>
 
     <string name="prefs_updated_title">යාවත්කාලීන කරන ලදී: %s</string>
diff --git a/core/presentation/src/main/res/values-tr/strings.xml b/core/presentation/src/main/res/values-tr/strings.xml
index f3de6b20..d0d65250 100644
--- a/core/presentation/src/main/res/values-tr/strings.xml
+++ b/core/presentation/src/main/res/values-tr/strings.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <!-- Commmon -->
-    <string name="app_name" translatable="false">Look4Sat</string>
+    <string name="app_name" translatable="false">Look4Sat-BA7OPF</string>
     <string name="btn_accept">Kabul et</string>
     <string name="btn_cancel">İptal</string>
     <string name="empty_list_message">Gösterilecek veri bulunamadı</string>
@@ -104,18 +104,16 @@
     <string name="map_visible">Görünür</string>
 
     <!-- Settings screen -->
-    <string name="prefs_app_title" translatable="false">Look4Sat v%s</string>
-    <string name="prefs_app_url" translatable="false">https://play.google.com/store/apps/details?id=com.rtbishop.look4sat</string>
-    <string name="prefs_donate_title">Bağış yap</string>
-    <string name="prefs_donate_url" translatable="false">https://ko-fi.com/rt_bishop</string>
-    <string name="prefs_fdroid_title" translatable="false">F-Droid</string>
-    <string name="prefs_fdroid_url" translatable="false">https://f-droid.org/en/packages/com.rtbishop.look4sat/</string>
+    <string name="prefs_app_title" translatable="false">Look4Sat-BA7OPF v%s</string>
+    <string name="prefs_app_url" translatable="false">https://github.com/atsunatsu/Look4Sat/releases</string>
     <string name="prefs_github_title" translatable="false">GitHub</string>
-    <string name="prefs_github_url" translatable="false">https://github.com/rt-bishop/Look4Sat/</string>
+    <string name="prefs_github_url" translatable="false">https://github.com/atsunatsu/Look4Sat</string>
     <string name="prefs_license_title" translatable="false">GPLv3</string>
     <string name="prefs_license_url" translatable="false">https://www.gnu.org/licenses/gpl-3.0.html</string>
     <string name="prefs_privacy_title">Gizlilik Politikası</string>
     <string name="prefs_privacy_url" translatable="false">https://sites.google.com/view/look4sat-privacy-policy/home</string>
+    <string name="prefs_upstream_title" translatable="false">Upstream Project</string>
+    <string name="prefs_upstream_url" translatable="false">https://github.com/rt-bishop/Look4Sat</string>
 
     <string name="prefs_updated_title">Güncellendi: %s</string>
     <string name="prefs_updated_time">d MMM yyyy - HH:mm:ss</string>
diff --git a/core/presentation/src/main/res/values-uk/strings.xml b/core/presentation/src/main/res/values-uk/strings.xml
index fa878bd0..761a5178 100644
--- a/core/presentation/src/main/res/values-uk/strings.xml
+++ b/core/presentation/src/main/res/values-uk/strings.xml
@@ -83,7 +83,6 @@
     <string name="map_visible">Видимий</string>
 
     <!-- Settings screen -->
-    <string name="prefs_donate_title">Підтримати</string>
     <string name="prefs_privacy_title">Політика конфіденційності</string>
 
     <string name="prefs_updated_title">Оновлено: %s</string>
diff --git a/core/presentation/src/main/res/values-zh/strings.xml b/core/presentation/src/main/res/values-zh/strings.xml
index e8f0ca91..ae1d2fdf 100644
--- a/core/presentation/src/main/res/values-zh/strings.xml
+++ b/core/presentation/src/main/res/values-zh/strings.xml
@@ -41,7 +41,7 @@
     <string name="pass_welcome_message">请务必在设置中通过GPS、经纬度或QTH定位您的位置\n建议至少每周更新一次数据库，以确保预测结果的准确性</string>
 
     <!-- AMSAT Status screen -->
-    <string name="pass_whatsnew_message">4.4.6 以来的全部更新（4.4.7 系列）：\n\n• 网格模式地图：LoTW 已确认网格绿色填充、漫游网格蓝色条纹、当前网格加粗框；右上角网格/卫星模式开关。\n\n• 首通呼号（VUCC 视图）：绿格显示该格最早通联的呼号，非绿格空白。\n\n• worked 网格可按操作网格筛选（含“全部”）；点击网格弹出 QSO 明细；每格 QSO 计数。\n\n• 各操作网格独立 VUCC 计数；极区网格标签；反经线修复；漫游条纹密度一致。\n\n• WAPC/WAJA 地图标签随系统语言。\n\n• 网格模式视口与筛选跨页保持。\n\n• LoTW 同步：账号直连、全量/增量模式、实时进度、可取消、启动自动同步（独立开关）、设置页显示上次同步时间。\n\n• 历史过境：过境筛选可回看过去数小时（历史过境时间）。\n\n• 指南针校准：8 字动作精度指示 + 手动航向偏置。\n\n• AMSAT 状态页：连续相同状态报告计数。\n\n• 过境/雷达：UTC 切换重算过境；日出日落与仰角颜色修复；卫星模糊搜索；相互过境页滚动保持、跟随 UTC、雷达快捷入口。\n\n• CW 解码器支持 32/64 位设备；Android 17 (API 37) 适配。</string>
+    <string name="pass_whatsnew_message">4.4.6 以来的全部更新（4.4.7 / 4.4.8 系列）：\n\n• 合并上游 4.4.8：IC-705 读频修复；地图昼夜分界线极性修复（秋分后昼夜阴影反相）；白色主题（地图、状态栏、弹窗与自绘网格/奖状图层一并适配）；卫星名模糊搜索。\n\n• LoTW 日志本：上传预检按真实 BAND/SATELLITE 给出原因；QSO 全详情编辑；卫星名按 TQSL 官方名录校验（非官方名不予保存）；FM 卫星固定记录语音转发器频率（SO-50 下行 436.795）；LoTW 确认记录会并入已上传的那条 QSO，不再另起一行（卫星名经 TQSL 别名表比对，报告里的 BAND 按上行解析）。\n\n• 弹窗统一为底部弹出栏同款配色与圆角。\n\n• 设置页链接指向本项目：版本号 → 发布页，GitHub → 本仓库。\n\n• 网格模式地图：LoTW 已确认网格绿色填充、漫游网格蓝色条纹、当前网格加粗框；右上角网格/卫星模式开关。\n\n• 首通呼号（VUCC 视图）：绿格显示该格最早通联的呼号，非绿格空白。\n\n• worked 网格可按操作网格筛选（含“全部”）；点击网格弹出 QSO 明细；每格 QSO 计数。\n\n• 各操作网格独立 VUCC 计数；极区网格标签；反经线修复；漫游条纹密度一致。\n\n• WAPC/WAJA 地图标签随系统语言。\n\n• 网格模式视口与筛选跨页保持。\n\n• LoTW 同步：账号直连、全量/增量模式、实时进度、可取消、启动自动同步（独立开关）、设置页显示上次同步时间。\n\n• 历史过境：过境筛选可回看过去数小时（历史过境时间）。\n\n• 指南针校准：8 字动作精度指示 + 手动航向偏置。\n\n• AMSAT 状态页：连续相同状态报告计数。\n\n• 过境/雷达：UTC 切换重算过境；日出日落与仰角颜色修复；卫星模糊搜索；相互过境页滚动保持、跟随 UTC、雷达快捷入口。\n\n• CW 解码器支持 32/64 位设备；Android 17 (API 37) 适配。\n\n• v4.4.7-ba7opf.21：日志本卫星名统一按 TQSL 官方名存取（SAUDISAT 1C → SO-50），存量记录自动改名；日志页与通联帖按卫星身份匹配。\n• v4.4.7-ba7opf.22：同步时自动修正旧确认行的频段方向；上传重复判定改为时间+卫星+呼号三者相同。\n• v4.4.7-ba7opf.23：应用更名为 Look4Sat-BA7OPF；致谢页声明为非官方修改版，关于页加入上游项目链接，移除打赏/F-Droid 卡片。</string>
 
 <string name="nav_amsat">AMSAT</string>
     <string name="amsat_title">AMSAT 卫星状态</string>
@@ -141,7 +141,6 @@
     <string name="map_visible">日照中</string>
 
     <!-- Settings screen -->
-    <string name="prefs_donate_title">支持</string>
     <string name="prefs_privacy_title">隐私政策</string>
 
     <string name="prefs_updated_title">更新：%s</string>
@@ -304,6 +303,7 @@
     <string name="prefs_compass_offset">手动航向偏置（°）</string>
     <string name="prefs_compass_offset_support">范围 −180° 至 +180°；正值为顺时针偏移。</string>
     <string name="prefs_compass_offset_reset">偏置归零</string>
+    <string name="prefs_other_switch_light_theme">浅色主题</string>
     <string name="prefs_other_switch_night_mode">启用红色夜间模式</string>
     <string name="prefs_other_switch_map_grid">地图显示 Maidenhead 网格</string>
 
@@ -312,7 +312,7 @@
     <string name="prefs_highlight_mid">中 %1$d-%2$d°</string>
     <string name="prefs_highlight_high">高 &gt; %1$d°</string>
 
-    <string name="prefs_outro_title">我要感谢：</string>
+    <string name="prefs_outro_title">致谢与声明</string>
     <string name="prefs_outro_thanks" translatable="false">
         • Look4Sat 所有用户及贡献者!
         \n• David A. B. Johnson (predict4java)
@@ -325,7 +325,9 @@
         \n• BH2VSQ BG5JSU（天地图渲染支持）
         \n• BG5JSU（LoTW上传支持）
     </string>
-    <string name="prefs_outro_license">该应用程序不提供任何保修.</string>
+    <string name="prefs_outro_notice">Look4Sat-BA7OPF 是基于 Look4Sat（GPL-3.0）的非官方修改版，由 BA7OPF 独立维护，与原项目无隶属关系，亦未获其背书。
+上游项目：https://github.com/rt-bishop/Look4Sat</string>
+<string name="prefs_outro_license">基于 GNU GPL v3 许可 · 本程序不提供任何保修</string>
 
     <!-- 匹配页 Mutual match page -->
     <string name="mutual_title">过境匹配</string>
@@ -374,4 +376,32 @@
     <string name="update_check_download_error">下载失败，请重试。</string>
     <string name="update_check_no_apk">该版本未附带 APK 安装包。</string>
 
+    <!-- QSO edit dialog -->
+    <string name="qso_edit_title">编辑通联记录</string>
+    <string name="qso_edit_uploaded_notice">该通联已上传或已确认。保存将保留原记录不变，并新建一条记录。</string>
+    <string name="qso_edit_callsign">呼号</string>
+    <string name="qso_edit_date">日期 (UTC)</string>
+    <string name="qso_edit_time">时间 (UTC)</string>
+    <string name="qso_edit_tx">上行频率 (MHz)</string>
+    <string name="qso_edit_rx">下行频率 (MHz)</string>
+    <string name="qso_edit_band">频段：%1$s</string>
+    <string name="qso_edit_mode">模式</string>
+    <string name="qso_edit_satellite">卫星</string>
+    <string name="qso_edit_hint_satellite">LoTW 只接受它的官方卫星名</string>
+    <string name="qso_edit_sent">发送报告</string>
+    <string name="qso_edit_received">接收报告</string>
+    <string name="qso_edit_grid">对方网格</string>
+    <string name="qso_edit_comment">备注</string>
+    <string name="qso_edit_save">保存</string>
+    <string name="qso_edit_cancel">取消</string>
+    <string name="qso_edit_err_callsign">呼号不能为空</string>
+    <string name="qso_edit_err_datetime">日期或时间格式不对 —— 应为 yyyy-MM-dd 与 HH:mm:ss（UTC）</string>
+    <string name="qso_edit_err_frequency">频率格式不对 —— 请输入 MHz，例如 145.850</string>
+    <string name="qso_edit_err_satellite">不是 LoTW 官方卫星名 —— 请从列表中选一个</string>
+    <string name="qso_edit_satellite_pick">选择</string>
+    <string name="qso_edit_satellite_pick_title">LoTW 官方卫星名</string>
+    <string name="qso_edit_satellite_search">搜索卫星名或数据源别名</string>
+    <string name="qso_edit_satellite_official">保存并签名时使用 %1$s</string>
+    <string name="qso_edit_warn_no_freq">没有上行频率：LoTW 要求 BAND，补上频率前这条无法上传</string>
+
 </resources>
diff --git a/core/presentation/src/main/res/values/strings.xml b/core/presentation/src/main/res/values/strings.xml
index a76797d4..a6176ff8 100644
--- a/core/presentation/src/main/res/values/strings.xml
+++ b/core/presentation/src/main/res/values/strings.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <!-- Commmon -->
-    <string name="app_name" translatable="false">Look4Sat</string>
+    <string name="app_name" translatable="false">Look4Sat-BA7OPF</string>
     <string name="btn_accept">Accept</string>
     <string name="btn_cancel">Cancel</string>
     <string name="empty_list_message">No data to show</string>
@@ -52,7 +52,7 @@
         Make sure to set your position via GPS, Lat/Lon or QTH in Settings.
         \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">All changes since 4.4.6 (the 4.4.7 series):\n\n• Grid-mode map: LoTW confirmed grids in green, roamed grids with blue stripes, current grid highlighted; mode switch pill at the map\'s top-right.\n\n• First-call labels (VUCC view): show the first callsign worked in each green grid instead of the grid code; non-worked cells stay empty.\n\n• Worked grids filtered by operated grid (with an All option); tap a grid to see its QSO detail dialog; per-grid QSO counts.\n\n• Per-operated-grid VUCC counting; polar grid labels; antimeridian fixes; consistent roamed-stripe density.\n\n• WAPC/WAJA map labels follow the system language.\n\n• Grid-mode viewport and award filter survive page switches.\n\n• LoTW sync: direct login, full/incremental modes, live progress, cancel button, auto-sync on app start with its own toggle, last-sync time shown.\n\n• Pass history: filter can look back over past passes (Time before).\n\n• Compass calibration: figure-eight accuracy meter plus manual heading offset.\n\n• AMSAT status page: consecutive same-status report counts.\n\n• Passes/radar: UTC toggle recalculates passes; sunrise/sunset and elevation color fixes; satellite fuzzy search; mutual page keeps scroll, follows UTC, radar shortcut.\n\n• CW decoder for 32/64-bit devices; Android 17 (API 37) support.</string>
+    <string name="pass_whatsnew_message">All changes since 4.4.6 (the 4.4.7 / 4.4.8 series):\n\n• Merged from upstream 4.4.8: IC-705 frequency readout fix; day/night terminator polarity fix (shading was inverted after the September equinox); white/light theme (map, status bar, dialogs and the custom grid/award overlays included); fuzzy satellite search.\n\n• LoTW logbook: upload pre-check reports the real BAND/SATELLITE reasons; full QSO detail editing; satellite names validated against the TQSL list (unofficial names are not saved); FM satellites always log the voice repeater frequency (SO-50 downlink 436.795); a LoTW confirmation now folds into the uploaded QSO instead of appearing as a second row (satellite names are matched through the TQSL aliases, and the report\'s BAND is read as the uplink).\n\n• Dialogs share the bottom-sheet colours and corner radius.\n\n• Settings links point to this project: version number -> releases page, GitHub -> repository.\n\n• Grid-mode map: LoTW confirmed grids in green, roamed grids with blue stripes, current grid highlighted; mode switch pill at the map\'s top-right.\n\n• First-call labels (VUCC view): show the first callsign worked in each green grid instead of the grid code; non-worked cells stay empty.\n\n• Worked grids filtered by operated grid (with an All option); tap a grid to see its QSO detail dialog; per-grid QSO counts.\n\n• Per-operated-grid VUCC counting; polar grid labels; antimeridian fixes; consistent roamed-stripe density.\n\n• WAPC/WAJA map labels follow the system language.\n\n• Grid-mode viewport and award filter survive page switches.\n\n• LoTW sync: direct login, full/incremental modes, live progress, cancel button, auto-sync on app start with its own toggle, last-sync time shown.\n\n• Pass history: filter can look back over past passes (Time before).\n\n• Compass calibration: figure-eight accuracy meter plus manual heading offset.\n\n• AMSAT status page: consecutive same-status report counts.\n\n• Passes/radar: UTC toggle recalculates passes; sunrise/sunset and elevation color fixes; satellite fuzzy search; mutual page keeps scroll, follows UTC, radar shortcut.\n\n• CW decoder for 32/64-bit devices; Android 17 (API 37) support.\n\n• v4.4.7-ba7opf.21: the logbook stores and shows satellites under their TQSL official names (SAUDISAT 1C -> SO-50); existing records are renamed automatically; the log page and QSO post match by satellite identity.\n• v4.4.7-ba7opf.22: stale confirmation rows get their band direction fixed on sync; upload duplicate detection keys on time + satellite + callsign.\n• v4.4.7-ba7opf.23: renamed to Look4Sat-BA7OPF; the credits card states this is an unofficial build, the About screen links the upstream project, and the Donate / F-Droid cards were removed.</string>
 
     <!-- AMSAT Status screen -->
     <string name="nav_amsat">AMSAT</string>
@@ -162,18 +162,16 @@
     <string name="map_visible">Visible</string>
 
     <!-- Settings screen -->
-    <string name="prefs_app_title" translatable="false">Look4Sat v%s</string>
-    <string name="prefs_app_url" translatable="false">https://play.google.com/store/apps/details?id=com.rtbishop.look4sat</string>
-    <string name="prefs_donate_title">Donate</string>
-    <string name="prefs_donate_url" translatable="false">https://ko-fi.com/rt_bishop</string>
-    <string name="prefs_fdroid_title" translatable="false">F-Droid</string>
-    <string name="prefs_fdroid_url" translatable="false">https://f-droid.org/en/packages/com.rtbishop.look4sat/</string>
+    <string name="prefs_app_title" translatable="false">Look4Sat-BA7OPF v%s</string>
+    <string name="prefs_app_url" translatable="false">https://github.com/atsunatsu/Look4Sat/releases</string>
     <string name="prefs_github_title" translatable="false">GitHub</string>
-    <string name="prefs_github_url" translatable="false">https://github.com/rt-bishop/Look4Sat/</string>
+    <string name="prefs_github_url" translatable="false">https://github.com/atsunatsu/Look4Sat</string>
     <string name="prefs_license_title" translatable="false">GPLv3</string>
     <string name="prefs_license_url" translatable="false">https://www.gnu.org/licenses/gpl-3.0.html</string>
     <string name="prefs_privacy_title">Privacy Policy</string>
     <string name="prefs_privacy_url" translatable="false">https://sites.google.com/view/look4sat-privacy-policy/home</string>
+    <string name="prefs_upstream_title" translatable="false">Upstream Project</string>
+    <string name="prefs_upstream_url" translatable="false">https://github.com/rt-bishop/Look4Sat</string>
 
     <string name="prefs_updated_title">Updated: %s</string>
     <string name="prefs_updated_time">d MMM yyyy - HH:mm:ss</string>
@@ -334,6 +332,7 @@
     <string name="prefs_compass_offset">Manual heading offset (°)</string>
     <string name="prefs_compass_offset_support">Range −180° to +180°. Positive values rotate clockwise.</string>
     <string name="prefs_compass_offset_reset">Reset offset</string>
+    <string name="prefs_other_switch_light_theme">Light theme</string>
     <string name="prefs_other_switch_night_mode">Enable red night mode filter</string>
     <string name="prefs_other_switch_map_grid">Show Maidenhead grid on map</string>
 
@@ -342,7 +341,7 @@
     <string name="prefs_highlight_mid">Mid %1$d–%2$d°</string>
     <string name="prefs_highlight_high">High &gt; %1$d°</string>
 
-    <string name="prefs_outro_title">I would like to say thanks to</string>
+    <string name="prefs_outro_title">Credits &amp; Notices</string>
     <string name="prefs_outro_thanks" translatable="false">
         * Look4Sat users and contributors!
         \n* David A. B. Johnson (predict4java)
@@ -355,7 +354,9 @@
         \n* BH2VSQ BG5JSU (TianDiTu rendering support)
         \n* BG5JSU (LoTW upload support)
     </string>
-    <string name="prefs_outro_license">The app comes with no warranty</string>
+    <string name="prefs_outro_notice">Look4Sat-BA7OPF is an unofficial modified build based on Look4Sat (GPL-3.0), independently maintained by BA7OPF. It is not affiliated with or endorsed by the original Look4Sat project.
+Upstream: https://github.com/rt-bishop/Look4Sat</string>
+<string name="prefs_outro_license">Licensed under the GNU General Public License v3 · The app comes with no warranty</string>
 
     <!-- Mutual match page -->
     <string name="mutual_title">Pass Match</string>
@@ -404,4 +405,32 @@
     <string name="update_check_download_error">Download failed. Try again.</string>
     <string name="update_check_no_apk">No APK attached to this release.</string>
 
+    <!-- QSO edit dialog -->
+    <string name="qso_edit_title">Edit QSO</string>
+    <string name="qso_edit_uploaded_notice">This QSO was already uploaded or confirmed. Saving keeps the original record unchanged and creates a new one.</string>
+    <string name="qso_edit_callsign">Callsign</string>
+    <string name="qso_edit_date">Date (UTC)</string>
+    <string name="qso_edit_time">Time (UTC)</string>
+    <string name="qso_edit_tx">Uplink (MHz)</string>
+    <string name="qso_edit_rx">Downlink (MHz)</string>
+    <string name="qso_edit_band">Band: %1$s</string>
+    <string name="qso_edit_mode">Mode</string>
+    <string name="qso_edit_satellite">Satellite</string>
+    <string name="qso_edit_hint_satellite">LoTW only accepts its official satellite name</string>
+    <string name="qso_edit_sent">Sent RST</string>
+    <string name="qso_edit_received">Received RST</string>
+    <string name="qso_edit_grid">Opposite grid</string>
+    <string name="qso_edit_comment">Comment</string>
+    <string name="qso_edit_save">Save</string>
+    <string name="qso_edit_cancel">Cancel</string>
+    <string name="qso_edit_err_callsign">Callsign is required</string>
+    <string name="qso_edit_err_datetime">Invalid date/time — use yyyy-MM-dd and HH:mm:ss (UTC)</string>
+    <string name="qso_edit_err_frequency">Invalid frequency — enter MHz, e.g. 145.850</string>
+    <string name="qso_edit_err_satellite">Not an ARRL satellite name — pick one from the list</string>
+    <string name="qso_edit_satellite_pick">Pick</string>
+    <string name="qso_edit_satellite_pick_title">ARRL satellite name</string>
+    <string name="qso_edit_satellite_search">Search name or catalogue alias</string>
+    <string name="qso_edit_satellite_official">Saved and signed as %1$s</string>
+    <string name="qso_edit_warn_no_freq">No uplink frequency: LoTW requires a band, so this QSO cannot be uploaded yet</string>
+
 </resources>
diff --git a/feature/cw/src/main/java/com/rtbishop/look4sat/feature/cw/CwDecodeScreen.kt b/feature/cw/src/main/java/com/rtbishop/look4sat/feature/cw/CwDecodeScreen.kt
index c2387315..ec897c3c 100644
--- a/feature/cw/src/main/java/com/rtbishop/look4sat/feature/cw/CwDecodeScreen.kt
+++ b/feature/cw/src/main/java/com/rtbishop/look4sat/feature/cw/CwDecodeScreen.kt
@@ -1,3 +1,21 @@
+/*
+ * Look4Sat-BA7OPF. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2026 BA7OPF.
+ * Based on Look4Sat by Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 /*
  * CwDecodeScreen.kt — Look4Sat 的 CW 解码页面(Compose 外壳)。
  *
diff --git a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/AwardBoundaryOverlay.kt b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/AwardBoundaryOverlay.kt
index beb2e517..bc952271 100644
--- a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/AwardBoundaryOverlay.kt
+++ b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/AwardBoundaryOverlay.kt
@@ -139,6 +139,18 @@ class AwardBoundaryOverlay : Overlay() {
         color = Color.argb(90, 76, 217, 100)
     }
 
+    /**
+     * Recolor the amber boundary/label paints for the active map theme (dark amber + white halo on
+     * the light map, light amber + black halo on the dark map). The worked fill reads on both.
+     */
+    fun applyTheme(isLightUi: Boolean) {
+        val line = if (isLightUi) Color.argb(200, 113, 92, 12) else Color.argb(160, 255, 224, 130)
+        val label = if (isLightUi) Color.argb(235, 30, 25, 5) else Color.argb(220, 255, 224, 130)
+        linePaint.color = line
+        labelPaint.color = label
+        labelPaint.setShadowLayer(3f, 2f, 2f, if (isLightUi) Color.WHITE else Color.BLACK)
+    }
+
     /** Boundary regions to render; assigning recomputes culling bounds. */
     var regions: List<AwardRegion> = emptyList()
         set(value) {
diff --git a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MaidenheadGridOverlay.kt b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MaidenheadGridOverlay.kt
index 66aa8dc3..c715efde 100644
--- a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MaidenheadGridOverlay.kt
+++ b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MaidenheadGridOverlay.kt
@@ -89,6 +89,24 @@ class MaidenheadGridOverlay : Overlay() {
         color = Color.argb(255, 76, 217, 100)
     }
 
+    /**
+     * Recolor the amber line/label paints for the active map theme: dark amber with a white halo
+     * on the light map, light amber with a black halo on the dark map. The worked / marked / roam /
+     * selected colors stay as they are — they read on both backgrounds.
+     */
+    fun applyTheme(isLightUi: Boolean) {
+        val line = if (isLightUi) Color.argb(200, 113, 92, 12) else Color.argb(160, 255, 224, 130)
+        val label = if (isLightUi) Color.argb(235, 30, 25, 5) else Color.argb(220, 255, 224, 130)
+        val halo = if (isLightUi) Color.WHITE else Color.BLACK
+        linePaint.color = line
+        // ownLine stays the same color as the normal grid lines (only thicker).
+        ownLinePaint.color = line
+        labelPaint.color = label
+        labelPaint.setShadowLayer(3f, 2f, 2f, halo)
+        firstCallPaint.color = label
+        firstCallPaint.setShadowLayer(3f, 2f, 2f, halo)
+    }
+
     /** Worked gridsquares (4-char, uppercase) to highlight, e.g. {"OL62", "PM95"}. */
     var workedGrids: Set<String> = emptySet()
 
diff --git a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapFilterViewModel.kt b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapFilterViewModel.kt
index ecb4c4a1..9d2af440 100644
--- a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapFilterViewModel.kt
+++ b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapFilterViewModel.kt
@@ -1,3 +1,21 @@
+/*
+ * Look4Sat-BA7OPF. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2026 BA7OPF.
+ * Based on Look4Sat by Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.rtbishop.look4sat.feature.map
 
 import androidx.compose.runtime.MutableState
diff --git a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapScreen.kt b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapScreen.kt
index a66f2f47..9dc17002 100644
--- a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapScreen.kt
+++ b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapScreen.kt
@@ -159,6 +159,71 @@ 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, footprint outline and map labels. It is recolored per
+ * theme (dark amber on light tiles, light amber on dark tiles) so every map element stays
+ * readable; [applyMapColors] keeps it in sync with the shared paints.
+ */
+private var mapAccentColor = "#FFE082".toColorInt()
+
+/** Grayscale + invert filter that turns the offline OSM map dark; unused (and off) in light theme. */
+private val darkTileFilter by lazy { createColorFilter() }
+
+/** Theme the shared map paints were last colored for; null = not applied yet this process. */
+private var mapIsLightUi: Boolean? = null
+
+/** Theme the tile filter / icon caches were last applied for (drives the per-frame theme check). */
+private var appliedLightUi: Boolean? = null
+
+/** True while the offline OSM source is active — satellite imagery (Tianditu) is never filtered. */
+private var offlineTilesActive = true
+
+/**
+ * Recolor the shared overlay paints and custom overlays for the current theme. Must run before the
+ * markers are (re)built each frame so freshly created icons use the new colors; [applyThemeToOverlays]
+ * and the icon-cache eviction in the update block handle the already created ones.
+ */
+private fun applyMapColors(isLightUi: Boolean) {
+    mapIsLightUi = isLightUi
+    if (isLightUi) {
+        // Dark amber (lightScheme primary) reads on light tiles; labels get a white halo.
+        mapAccentColor = "#715C0C".toColorInt()
+        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)
+    }
+    applyThemeToOverlays()
+}
+
+/** Push the current theme into the grid / award overlays, which own their own paints. */
+private fun applyThemeToOverlays() {
+    val isLight = mapIsLightUi == true
+    currentMapView?.overlays?.forEach { overlay ->
+        when (overlay) {
+            is MaidenheadGridOverlay -> overlay.applyTheme(isLight)
+            is AwardBoundaryOverlay -> overlay.applyTheme(isLight)
+            else -> Unit
+        }
+    }
+}
+
+/** The MapView currently attached to the map page; used to recolor overlays on a theme change. */
+private var currentMapView: MapView? = null
+
 @Composable
 fun MapDestination(
     mapFilterViewModel: MapFilterViewModel,
@@ -320,8 +385,8 @@ private fun MapScreen(
         val firstPos = uiState.track?.firstOrNull()?.firstOrNull() ?: return@LaunchedEffect
         mapView.controller.animateTo(GeoPoint(firstPos.latitude, firstPos.longitude))
     }
-    LaunchedEffect(uiState.mapSource, uiState.tiandituKey) {
-        configureTileSources(mapView, uiState.mapSource, uiState.tiandituKey)
+    LaunchedEffect(uiState.mapSource, uiState.tiandituKey, uiState.isLightUi) {
+        configureTileSources(mapView, uiState.mapSource, uiState.tiandituKey, uiState.isLightUi)
     }
     Column(modifier = Modifier.layoutPadding(), verticalArrangement = Arrangement.spacedBy(6.dp)) {
         val isVertical = isVerticalLayout()
@@ -359,6 +424,18 @@ private fun MapScreen(
                     mutableStateOf(restoredViewport && uiState.isGridMode)
                 }
                 AndroidView({ mapView }) { view ->
+                    // Theme change: recolor the paints/tile filter/overlays and drop the icon
+                    // caches, which baked the previous theme's colors into their bitmaps.
+                    if (appliedLightUi != uiState.isLightUi) {
+                        appliedLightUi = uiState.isLightUi
+                        applyMapColors(uiState.isLightUi)
+                        iconCache.evictAll()
+                        dotIcon = null
+                        view.overlayManager.tilesOverlay.setColorFilter(
+                            if (!uiState.isLightUi && offlineTilesActive) darkTileFilter else null
+                        )
+                        requestTileRefresh(view)
+                    }
                     // Award filter mode: show the selected award's regions with
                     // worked ones filled green; hide satellite layers like grid mode.
                     val awardMode = selectedAward?.takeIf { it != AwardType.VUCC }
@@ -393,13 +470,13 @@ private fun MapScreen(
                         }
                     }
                     if (!uiState.isGridMode) {
-                        uiState.stationPosition?.let { setStationPosition(it, view) }
+                        uiState.stationPosition?.let { setStationPosition(it, view, uiState.isLightUi) }
                         uiState.track?.let { setSatelliteTrack(it, view) }
                         uiState.footprint?.let { setFootprint(it, view) }
                         uiState.positions?.let { setPositions(it, view) { item -> onAction(MapAction.SelectItem(item)) } }
                         setTerminator(uiState.sunLatDeg, uiState.sunLonDeg, view)
-                        setSubSolarPoint(uiState.sunLatDeg, uiState.sunLonDeg, view)
-                        setMoonPosition(uiState.moonLatDeg, uiState.moonLonDeg, view)
+                        setSubSolarPoint(uiState.sunLatDeg, uiState.sunLonDeg, view, uiState.isLightUi)
+                        setMoonPosition(uiState.moonLatDeg, uiState.moonLonDeg, view, uiState.isLightUi)
                     }
                     view.invalidate()
                 }
@@ -634,7 +711,7 @@ private fun MarkedStationRow(
             text = marked.call,
             style = MaterialTheme.typography.titleMedium,
             fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace,
-            color = ComposeColor(0xFFFFE082),
+            color = MaterialTheme.colorScheme.primary,
             maxLines = 1,
             overflow = androidx.compose.ui.text.style.TextOverflow.Ellipsis,
             modifier = Modifier.weight(1f)
@@ -651,7 +728,7 @@ private fun MarkedStationRow(
                 Icon(
                     painter = painterResource(R.drawable.ic_pin),
                     contentDescription = stringResource(R.string.grid_mark_pin),
-                    tint = if (isPinned) ComposeColor(0xFF9E9E9E) else ComposeColor(0xFFFFE082),
+                    tint = if (isPinned) ComposeColor(0xFF9E9E9E) else MaterialTheme.colorScheme.primary,
                     modifier = Modifier
                         .size(18.dp)
                         .clickable(onClick = onPinMark)
@@ -706,7 +783,7 @@ private fun WorkedGridCallRow(
                 text = call,
                 style = MaterialTheme.typography.titleMedium,
                 fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace,
-                color = ComposeColor(0xFFFFE082),
+                color = MaterialTheme.colorScheme.primary,
                 maxLines = 1,
                 overflow = androidx.compose.ui.text.style.TextOverflow.Ellipsis,
                 modifier = Modifier.weight(1f)
@@ -1092,22 +1169,29 @@ private fun FirstCallToggle(
 // region Tile sources
 private var configuredTileMapView: MapView? = null
 private var configuredTileSource: String? = null
+private var configuredTileIsLightUi: Boolean? = null
 
-private fun configureTileSources(mapView: MapView, mapSource: String, tiandituKey: String) {
+private fun configureTileSources(mapView: MapView, mapSource: String, tiandituKey: String, isLightUi: Boolean) {
     val key = tiandituKey.trim()
     val layers = tiandituLayers(mapSource)
-    val sourceKey = if (layers == null || key.isBlank()) MapSource.OSM else "${layers.base}:$key"
-    if (configuredTileMapView === mapView && configuredTileSource == sourceKey) return
+    val offlineSource = layers == null || key.isBlank()
+    offlineTilesActive = offlineSource
+    val sourceKey = if (offlineSource) MapSource.OSM else "${layers.base}:$key"
+    if (configuredTileMapView === mapView && configuredTileSource == sourceKey &&
+        configuredTileIsLightUi == isLightUi
+    ) return
 
     configuredTileMapView = mapView
     configuredTileSource = sourceKey
+    configuredTileIsLightUi = isLightUi
     (mapView.overlays.getOrNull(OVERLAY_TDT_LABELS) as? TilesOverlay)?.onDetach(mapView)
 
-    if (layers == null || key.isBlank()) {
+    if (offlineSource) {
         mapView.setUseDataConnection(false)
         mapView.setTileSource(offlineTileSource)
         mapView.maxZoomLevel = OFFLINE_MAX_ZOOM
-        mapView.overlayManager.tilesOverlay.applyTileOverlayDefaults(createColorFilter())
+        // The dark-map filter belongs to the dark theme only; the light theme shows plain tiles.
+        mapView.overlayManager.tilesOverlay.applyTileOverlayDefaults(if (isLightUi) null else darkTileFilter)
         mapView.overlays[OVERLAY_TDT_LABELS] = FolderOverlay()
         requestTileRefresh(mapView)
         return
@@ -1210,6 +1294,7 @@ private fun setAwardMode(award: AwardType, workedCodes: Set<String>, mapView: Ma
             isEnabled = true
             regions = AwardBoundaryData.load(mapView.context, asset)
             this.workedCodes = workedCodes
+            applyTheme(mapIsLightUi == true)
         }
     }
     for (index in OVERLAY_STATION..OVERLAY_MOON) {
@@ -1252,6 +1337,7 @@ private fun setGridMode(
                 this.firstCallsByGrid = firstCallsByGrid
                 this.markedGrids = markedGrids
                 this.ownGrid = ownGridOf(stationPosition)
+                applyTheme(mapIsLightUi == true)
             }
         }
         // Satellite-related layers are hidden in grid mode; the grid overlay
@@ -1306,17 +1392,28 @@ private fun gridOfPoint(latitude: Double, longitude: Double): String? {
     return "${'A' + fieldLon}${'A' + fieldLat}$subLon$subLat"
 }
 
-private fun setStationPosition(stationPos: GeoPos, mapView: MapView) {
+private fun setStationPosition(stationPos: GeoPos, mapView: MapView, isLightUi: Boolean) {
     try {
         val overlay = mapView.overlays[OVERLAY_STATION]
+        val stationPoint = GeoPoint(stationPos.latitude, stationPos.longitude)
         if (overlay is Marker) {
-            overlay.position = GeoPoint(stationPos.latitude, stationPos.longitude)
+            overlay.position = stationPoint
+            // Icon tint is baked into the drawable, so re-tint after a theme change.
+            if ((overlay.relatedObject as? Boolean) != isLightUi) {
+                overlay.icon = ContextCompat.getDrawable(mapView.context, R.drawable.ic_position)?.apply {
+                    setTint(mapAccentColor)
+                }
+                overlay.relatedObject = isLightUi
+            }
         } else {
             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)
-                position = GeoPoint(stationPos.latitude, stationPos.longitude)
+                icon = ContextCompat.getDrawable(mapView.context, R.drawable.ic_position)?.apply {
+                    setTint(mapAccentColor)
+                }
+                position = stationPoint
+                relatedObject = isLightUi
             }
         }
     } catch (e: Exception) {
@@ -1539,26 +1636,37 @@ private fun setTerminator(sunLatDeg: Double, sunLonDeg: Double, mapView: MapView
     }
 }
 
+/** Build the 48dp sun/moon marker icon, tinted with the theme-dependent paint. */
+private fun buildMarkerIcon(mapView: MapView, resId: Int, paint: Paint): Drawable {
+    val iconSize = 48
+    val bmp = createBitmap(iconSize, iconSize)
+    ContextCompat.getDrawable(mapView.context, resId)?.apply {
+        setBounds(0, 0, iconSize, iconSize)
+        colorFilter = paint.colorFilter
+        draw(Canvas(bmp))
+    }
+    return bmp.toDrawable(mapView.context.resources)
+}
+
 /** Place an ic_sun icon marker at the sub-solar point. */
-private fun setSubSolarPoint(sunLatDeg: Double, sunLonDeg: Double, mapView: MapView) {
+private fun setSubSolarPoint(sunLatDeg: Double, sunLonDeg: Double, mapView: MapView, isLightUi: Boolean) {
     try {
         val overlay = mapView.overlays[OVERLAY_SUN]
         val sunPos = GeoPoint(sunLatDeg, sunLonDeg)
         if (overlay is Marker) {
             overlay.position = sunPos
-        } else {
-            val iconSize = 48
-            val bmp = createBitmap(iconSize, iconSize)
-            ContextCompat.getDrawable(mapView.context, R.drawable.ic_sun)?.apply {
-                setBounds(0, 0, iconSize, iconSize)
-                colorFilter = sunIconPaint.colorFilter
-                draw(Canvas(bmp))
+            // The icon bitmap bakes in the theme tint, so rebuild it after a theme change.
+            if ((overlay.relatedObject as? Boolean) != isLightUi) {
+                overlay.icon = buildMarkerIcon(mapView, R.drawable.ic_sun, sunIconPaint)
+                overlay.relatedObject = isLightUi
             }
+        } else {
             mapView.overlays[OVERLAY_SUN] = Marker(mapView).apply {
                 setInfoWindow(null)
                 setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_CENTER)
-                icon = bmp.toDrawable(mapView.context.resources)
+                icon = buildMarkerIcon(mapView, R.drawable.ic_sun, sunIconPaint)
                 position = sunPos
+                relatedObject = isLightUi
             }
         }
     } catch (e: Exception) {
@@ -1567,26 +1675,23 @@ private fun setSubSolarPoint(sunLatDeg: Double, sunLonDeg: Double, mapView: MapV
 }
 
 /** Place an ic_moon icon marker at the sub-lunar point. */
-private fun setMoonPosition(moonLatDeg: Double, moonLonDeg: Double, mapView: MapView) {
+private fun setMoonPosition(moonLatDeg: Double, moonLonDeg: Double, mapView: MapView, isLightUi: Boolean) {
     try {
         val overlay = mapView.overlays[OVERLAY_MOON]
         val moonPos = GeoPoint(moonLatDeg, moonLonDeg)
         if (overlay is Marker) {
             overlay.position = moonPos
-        } else {
-            val iconSize = 48
-            val bmp = createBitmap(iconSize, iconSize)
-            val c = Canvas(bmp)
-            ContextCompat.getDrawable(mapView.context, R.drawable.ic_moon)?.apply {
-                setBounds(0, 0, iconSize, iconSize)
-                colorFilter = moonIconPaint.colorFilter
-                draw(c)
+            if ((overlay.relatedObject as? Boolean) != isLightUi) {
+                overlay.icon = buildMarkerIcon(mapView, R.drawable.ic_moon, moonIconPaint)
+                overlay.relatedObject = isLightUi
             }
+        } else {
             mapView.overlays[OVERLAY_MOON] = Marker(mapView).apply {
                 setInfoWindow(null)
                 setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_CENTER)
-                icon = bmp.toDrawable(mapView.context.resources)
+                icon = buildMarkerIcon(mapView, R.drawable.ic_moon, moonIconPaint)
                 position = moonPos
+                relatedObject = isLightUi
             }
         }
     } catch (e: Exception) {
@@ -1631,10 +1736,12 @@ private fun rememberMapViewWithLifecycle(
             zoomController.setVisibility(CustomZoomButtonsController.Visibility.NEVER)
             overlayManager.tilesOverlay.loadingBackgroundColor = Color.TRANSPARENT
             overlayManager.tilesOverlay.loadingLineColor = Color.TRANSPARENT
-            overlayManager.tilesOverlay.setColorFilter(createColorFilter())
+            // The dark-map tile filter (or no filter in the light theme) is applied per theme from
+            // the AndroidView update block, so it also follows a theme switch at runtime.
             setScrollableAreaLimitLatitude(maxLat, minLat, 0)
             overlays.addAll(Array(OVERLAY_COUNT) { FolderOverlay() })
-            overlays[OVERLAY_GRID] = MaidenheadGridOverlay()
+            overlays[OVERLAY_GRID] = MaidenheadGridOverlay().apply { applyTheme(mapIsLightUi == true) }
+            currentMapView = this
         }
     }
     val lifecycleObserver = rememberMapViewLifecycleObserver(mapView)
@@ -1647,7 +1754,10 @@ private fun rememberMapViewWithLifecycle(
     // released with the MapView or they keep the Activity and its bitmaps alive after disposal.
     // (The viewport save lives in MapDestination, where the grid/satellite mode is known.)
     DisposableEffect(mapView) {
-        onDispose { clearMapCaches() }
+        onDispose {
+            clearMapCaches()
+            if (currentMapView === mapView) currentMapView = null
+        }
     }
     return mapView
 }
diff --git a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapViewModel.kt b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapViewModel.kt
index 179149d2..4c21261f 100644
--- a/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapViewModel.kt
+++ b/feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapViewModel.kt
@@ -84,6 +84,7 @@ class MapViewModel(
                 _uiState.update {
                     it.copy(
                         isUtc = settings.stateOfUtc,
+                        isLightUi = settings.stateOfLightTheme,
                         mapSource = settings.mapSource,
                         tiandituKey = settings.tiandituKey,
                         isGridMode = settings.stateOfMapGrid,
diff --git a/feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsScreen.kt b/feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsScreen.kt
index e5390daa..70c58b0d 100644
--- a/feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsScreen.kt
+++ b/feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsScreen.kt
@@ -35,6 +35,7 @@ import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.GridItemSpan
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.material3.ElevatedCard
+import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.LinearProgressIndicator
 import androidx.compose.material3.MaterialTheme
@@ -264,11 +265,13 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
     if (dialogs.logbook) {
         LogbookDialog(
             records = uiState.logbookRecords,
+            satelliteCandidates = uiState.satelliteCatalog,
             uploadBusy = uiState.logbookUploadBusy,
             uploadMessage = uiState.logbookUploadMessage,
             preview = uiState.logbookPreview,
             onDismiss = { dialogs.logbook = false },
             onDelete = { onAction(SettingsAction.DeleteLogbookRecord(it)) },
+            onEdit = { onAction(SettingsAction.UpdateLogbookRecord(it)) },
             onUpload = { onAction(SettingsAction.PrepareLogbookUpload) },
             onConfirmUpload = { onAction(SettingsAction.ConfirmLogbookUpload) },
             onDismissPreview = { onAction(SettingsAction.DismissLogbookPreview) },
@@ -292,10 +295,8 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
 
     // URLs for top bar
     val uriHandler = LocalUriHandler.current
-    val appUrl = stringResource(R.string.prefs_app_url)
-    val donateUrl = stringResource(R.string.prefs_donate_url)
-    val fdroidTitle = stringResource(R.string.prefs_fdroid_title)
-    val fdroidUrl = stringResource(R.string.prefs_fdroid_url)
+    val upstreamTitle = stringResource(R.string.prefs_upstream_title)
+    val upstreamUrl = stringResource(R.string.prefs_upstream_url)
     val gitHubTitle = stringResource(R.string.prefs_github_title)
     val gitHubUrl = stringResource(R.string.prefs_github_url)
     val licenseUrl = stringResource(R.string.prefs_license_url)
@@ -309,18 +310,17 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
             if (isVerticalLayout) {
                 TopBar {
                     TopCard(
-                        onClick = { safeOpenUri(appUrl) },
+                        onClick = { showUpdateChecker = true },
                         version = uiState.appVersionName,
                         modifier = Modifier.weight(1f)
                     )
-                    PrimaryIconCard(onClick = { safeOpenUri(donateUrl) }, resId = R.drawable.ic_pound)
                 }
                 TopBar {
                     Row(modifier = Modifier.weight(1f), horizontalArrangement = Arrangement.spacedBy(6.dp)) {
                         BotCard(
-                            onClick = { safeOpenUri(fdroidUrl) },
-                            resId = R.drawable.ic_fdroid,
-                            text = fdroidTitle,
+                            onClick = { safeOpenUri(upstreamUrl) },
+                            resId = R.drawable.ic_github,
+                            text = upstreamTitle,
                             modifier = Modifier.weight(1f)
                         )
                         BotCard(
@@ -335,17 +335,16 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
                 }
             } else {
                 TopBar {
-                    PrimaryIconCard(onClick = { safeOpenUri(donateUrl) }, resId = R.drawable.ic_pound)
                     TopCard(
-                        onClick = { safeOpenUri(appUrl) },
+                        onClick = { showUpdateChecker = true },
                         version = uiState.appVersionName,
                         modifier = Modifier.weight(1f)
                     )
                     Row(modifier = Modifier.weight(1f), horizontalArrangement = Arrangement.spacedBy(6.dp)) {
                         BotCard(
-                            onClick = { safeOpenUri(fdroidUrl) },
-                            resId = R.drawable.ic_fdroid,
-                            text = fdroidTitle,
+                            onClick = { safeOpenUri(upstreamUrl) },
+                            resId = R.drawable.ic_github,
+                            text = upstreamTitle,
                             modifier = Modifier.weight(1f)
                         )
                         BotCard(
@@ -639,7 +638,7 @@ private fun OtherCard(
     ElevatedCard(
         modifier = Modifier
             .fillMaxWidth()
-            .height(370.dp)
+            .height(420.dp) // 370dp + one switch row (light theme)
     ) {
         Column(modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp)) {
             Text(
@@ -666,7 +665,16 @@ private fun OtherCard(
                 text = stringResource(R.string.prefs_compass_calibration_button),
                 modifier = Modifier.fillMaxWidth()
             )
-            SwitchRow(R.string.prefs_other_switch_night_mode, settings.stateOfNightMode) {
+            // Appearance: light theme + the red night filter (mutually exclusive —
+            // the night filter is disabled while the light theme is on).
+            SwitchRow(R.string.prefs_other_switch_light_theme, settings.stateOfLightTheme) {
+                onAction(SettingsAction.ToggleLightTheme(it))
+            }
+            SwitchRow(
+                R.string.prefs_other_switch_night_mode,
+                settings.stateOfNightMode,
+                enabled = !settings.stateOfLightTheme
+            ) {
                 onAction(SettingsAction.ToggleNightMode(it))
             }
         }
@@ -762,14 +770,19 @@ private fun CompassCalibrationDialog(
 }
 
 @Composable
-private fun SwitchRow(labelResId: Int, checked: Boolean, onCheckedChange: (Boolean) -> Unit) {
+private fun SwitchRow(
+    labelResId: Int,
+    checked: Boolean,
+    enabled: Boolean = true,
+    onCheckedChange: (Boolean) -> Unit
+) {
     Row(
         horizontalArrangement = Arrangement.SpaceBetween,
         verticalAlignment = Alignment.CenterVertically,
         modifier = Modifier.fillMaxWidth()
     ) {
         Text(text = stringResource(id = labelResId))
-        Switch(checked = checked, onCheckedChange = onCheckedChange)
+        Switch(checked = checked, enabled = enabled, onCheckedChange = onCheckedChange)
     }
 }
 
@@ -845,27 +858,28 @@ private fun CardCreditsPreview() = MainTheme { CardCredits() }
 
 @Composable
 private fun CardCredits(modifier: Modifier = Modifier) {
-    ElevatedCard(
-        modifier = modifier
-            .fillMaxWidth()
-            .height(268.dp)
-    ) {
+    ElevatedCard(modifier = modifier.fillMaxWidth()) {
         Column(
-            verticalArrangement = Arrangement.SpaceBetween,
-            modifier = Modifier
-                .padding(horizontal = 8.dp, vertical = 4.dp)
-                .fillMaxHeight()
+            verticalArrangement = Arrangement.spacedBy(6.dp),
+            modifier = Modifier.padding(horizontal = 8.dp, vertical = 8.dp)
         ) {
             Text(
                 text = stringResource(id = R.string.prefs_outro_title),
                 color = MaterialTheme.colorScheme.primary
             )
             Text(
-                text = stringResource(id = R.string.prefs_outro_thanks)
+                text = stringResource(id = R.string.prefs_outro_notice),
+                fontSize = 12.sp
+            )
+            HorizontalDivider()
+            Text(
+                text = stringResource(id = R.string.prefs_outro_thanks),
+                fontSize = 12.sp
             )
             Text(
                 text = stringResource(id = R.string.prefs_outro_license),
-                color = MaterialTheme.colorScheme.primary
+                color = MaterialTheme.colorScheme.primary,
+                fontSize = 12.sp
             )
         }
     }
diff --git a/feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsState.kt b/feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsState.kt
index c19f4f3b..46086d80 100644
--- a/feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsState.kt
+++ b/feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsState.kt
@@ -70,6 +70,8 @@ data class SettingsState(
     val lotwLastSyncEpochMs: Long = 0L,
     /** Logbook (QSO records + LoTW confirmations), newest first. */
     val logbookRecords: List<com.rtbishop.look4sat.core.domain.logbook.QsoRecord> = emptyList(),
+    /** ARRL satellite names (config.tq6) — the only names a record may be signed with. */
+    val satelliteCatalog: List<String> = emptyList(),
     /** Imported LoTW upload certificate (null when none). */
     val lotwCertificate: com.rtbishop.look4sat.core.domain.repository.LoTWCertificate? = null,
     /** LoTW upload station location (null when unset). */
@@ -153,6 +155,8 @@ sealed interface SettingsAction {
     // Logbook (QSO records + LoTW confirmations)
     data object RefreshLogbook : SettingsAction
     data class DeleteLogbookRecord(val id: Long) : SettingsAction
+    /** Persist an edited record (frequency/callsign/time/…) from the logbook dialog. */
+    data class UpdateLogbookRecord(val record: com.rtbishop.look4sat.core.domain.logbook.QsoRecord) : SettingsAction
     data object PrepareLogbookUpload : SettingsAction
     data object ConfirmLogbookUpload : SettingsAction
     data object DismissLogbookPreview : SettingsAction