diff --git a/App.tsx b/App.tsx
index 0329d0c..38cebdd 100644
--- a/App.tsx
+++ b/App.tsx
@@ -1,20 +1,12 @@
 import { StatusBar } from 'expo-status-bar';
-import { StyleSheet, Text, View } from 'react-native';
+import { GestureHandlerRootView } from 'react-native-gesture-handler';
+import { AppNavigator } from './src/navigation/AppNavigator';
 
 export default function App() {
   return (
-    <View style={styles.container}>
-      <Text>Open up App.tsx to start working on your app!</Text>
-      <StatusBar style="auto" />
-    </View>
+    <GestureHandlerRootView style={{ flex: 1 }}>
+      <StatusBar style="light" />
+      <AppNavigator />
+    </GestureHandlerRootView>
   );
 }
-
-const styles = StyleSheet.create({
-  container: {
-    flex: 1,
-    backgroundColor: '#fff',
-    alignItems: 'center',
-    justifyContent: 'center',
-  },
-});
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c5ff840
--- /dev/null
+++ b/README.md
@@ -0,0 +1,206 @@
+# bincio-rec
+
+GPS activity recorder for cycling, running, hiking, and walking.
+Records GPS tracks + BLE sensor data (HR, power, cadence) and saves them as GPX files.
+Part of the [bincio ecosystem](#ecosystem).
+
+---
+
+## Prerequisites
+
+### All platforms
+
+| Tool | Version | Notes |
+|---|---|---|
+| Node.js | 22+ | [nodejs.org](https://nodejs.org) |
+| npm | 10+ | Comes with Node |
+| Expo CLI | latest | `npm install -g expo-cli` (optional, `npx expo` works too) |
+
+### Android
+
+| Tool | Notes |
+|---|---|
+| Android Studio | [developer.android.com/studio](https://developer.android.com/studio) |
+| Android SDK | Install via Android Studio SDK Manager |
+| JDK 17 | Bundled with Android Studio, or install separately |
+| `ANDROID_HOME` env var | Set to your SDK path, e.g. `~/Library/Android/sdk` |
+
+Minimum supported Android version: **API 26 (Android 8.0)**.
+
+### iOS (macOS only)
+
+| Tool | Notes |
+|---|---|
+| Xcode 16+ | Install from the Mac App Store |
+| Xcode Command Line Tools | `xcode-select --install` |
+| CocoaPods | `sudo gem install cocoapods` |
+| Apple Developer account | Free account works for device sideloading |
+
+Minimum supported iOS version: **16.4**.
+
+---
+
+## Setup
+
+```bash
+# 1. Install JS dependencies
+npm install
+
+# 2. Prebuild was already run — android/ and ios/ directories exist.
+#    Re-run only when you add/remove native modules:
+npx expo prebuild --clean
+```
+
+---
+
+## Running in development
+
+### Android
+
+```bash
+# Start Metro bundler + launch on a connected device or emulator
+npm run android
+
+# Or target a specific device
+npx expo run:android --device
+```
+
+**Android emulator setup:** In Android Studio → Device Manager, create an AVD with API 34+, x86_64 image. Start it before running the command above.
+
+**Physical device:** Enable Developer Options → USB Debugging, then connect via USB.
+
+> **Battery optimization:** On first launch, the app will prompt you to whitelist it in battery settings. This is required for background GPS recording to survive on Xiaomi / Samsung / Huawei devices.
+
+### iOS
+
+```bash
+# Install CocoaPods dependencies (first time and after native changes)
+cd ios && pod install && cd ..
+
+# Start Metro bundler + launch on a connected device or simulator
+npm run ios
+
+# Or target a specific simulator
+npx expo run:ios --simulator "iPhone 16"
+
+# Or target a physical device (requires Apple Developer account)
+npx expo run:ios --device
+```
+
+**Location permission:** iOS will prompt for location access. Choose **Always Allow** — background GPS recording requires it.
+
+---
+
+## Building release APK / IPA
+
+### Android — local release APK
+
+```bash
+cd android
+./gradlew assembleRelease
+# Output: android/app/build/outputs/apk/release/app-release.apk
+```
+
+To build a release AAB (required for Play Store):
+
+```bash
+./gradlew bundleRelease
+# Output: android/app/build/outputs/bundle/release/app-release.aab
+```
+
+**Signing:** Create a keystore and configure `android/app/build.gradle` with your signing config before a production release. See [React Native signing docs](https://reactnative.dev/docs/signed-apk-android).
+
+### iOS — local release archive
+
+Open Xcode:
+
+```bash
+open ios/binciorec.xcworkspace
+```
+
+1. Select your device or **Any iOS Device (arm64)** as the target.
+2. Set your Team in **Signing & Capabilities**.
+3. **Product → Archive**.
+4. In the Organizer window, click **Distribute App**.
+
+---
+
+## Building with EAS Build (recommended for CI / TestFlight)
+
+EAS Build runs in Expo's cloud so you don't need Android Studio or Xcode locally.
+
+```bash
+# Install EAS CLI
+npm install -g eas-cli
+
+# Log in to your Expo account
+eas login
+
+# Configure the project (first time only — creates eas.json)
+eas build:configure
+
+# Build Android APK for local testing
+eas build --platform android --profile preview
+
+# Build Android AAB for Play Store
+eas build --platform android --profile production
+
+# Build iOS IPA for TestFlight / App Store
+eas build --platform ios --profile production
+```
+
+Builds appear at [expo.dev](https://expo.dev) and a download link is printed when done.
+
+---
+
+## Project structure
+
+```
+bincio-rec/
+├── App.tsx                    # Entry point
+├── app.json                   # Expo config (permissions, plugins, bundle IDs)
+├── android/                   # Generated Android project (do not edit manually)
+├── ios/                       # Generated iOS project (do not edit manually)
+└── src/
+    ├── types/index.ts         # Shared TypeScript types
+    ├── store/recording.ts     # Zustand recording state + haversine stats
+    ├── services/
+    │   ├── gps.ts             # Background GPS via expo-location + expo-task-manager
+    │   ├── ble.ts             # BLE scan / connect / HR + power subscriptions
+    │   ├── gpx.ts             # GPX file builder (Garmin trackpoint extensions)
+    │   ├── upload.ts          # Upload GPX to bincio-activity /api/upload/raw
+    │   └── db.ts              # SQLite CRUD for saved recordings list
+    ├── screens/
+    │   ├── RecordingScreen.tsx
+    │   ├── PostRecordingScreen.tsx
+    │   ├── SensorPairingScreen.tsx
+    │   ├── SavedRecordingsScreen.tsx
+    │   └── SettingsScreen.tsx
+    └── navigation/
+        └── AppNavigator.tsx   # Root stack + bottom tabs
+```
+
+---
+
+## Ecosystem
+
+```
+bincio-rec          →  writes GPX files to device storage
+bincio-autarchive   →  imports GPX, stores locally, syncs to server
+bincio-activity     →  server: parses GPX, stores activities, serves API
+bincio-auth         →  auth service: issues JWTs for all bincio apps
+```
+
+Configure your bincio instance URL and API token in **Settings** to enable direct upload from the app.
+
+---
+
+## Adding native modules
+
+Any new Expo or React Native library with native code requires a prebuild + reinstall cycle:
+
+```bash
+npx expo install <package-name>
+npx expo prebuild --clean   # regenerates android/ and ios/
+cd ios && pod install && cd ..
+```
diff --git a/app.json b/app.json
index f935524..0b23c10 100644
--- a/app.json
+++ b/app.json
@@ -1,25 +1,60 @@
 {
   "expo": {
-    "name": "bincio_rec_scaffold",
-    "slug": "bincio_rec_scaffold",
+    "name": "bincio-rec",
+    "slug": "bincio-rec",
     "version": "1.0.0",
     "orientation": "portrait",
     "icon": "./assets/icon.png",
-    "userInterfaceStyle": "light",
+    "userInterfaceStyle": "dark",
     "ios": {
-      "supportsTablet": true
+      "supportsTablet": false,
+      "bundleIdentifier": "com.bincio.rec",
+      "infoPlist": {
+        "NSLocationWhenInUseUsageDescription": "bincio-rec uses your location to record your activity track.",
+        "NSLocationAlwaysAndWhenInUseUsageDescription": "bincio-rec uses your location in the background to record your activity track.",
+        "UIBackgroundModes": ["location"]
+      }
     },
     "android": {
+      "package": "com.bincio.rec",
       "adaptiveIcon": {
-        "backgroundColor": "#E6F4FE",
+        "backgroundColor": "#111111",
         "foregroundImage": "./assets/android-icon-foreground.png",
         "backgroundImage": "./assets/android-icon-background.png",
         "monochromeImage": "./assets/android-icon-monochrome.png"
       },
-      "predictiveBackGestureEnabled": false
+      "predictiveBackGestureEnabled": false,
+      "permissions": [
+        "ACCESS_FINE_LOCATION",
+        "ACCESS_BACKGROUND_LOCATION",
+        "FOREGROUND_SERVICE",
+        "FOREGROUND_SERVICE_LOCATION",
+        "BLUETOOTH",
+        "BLUETOOTH_ADMIN",
+        "BLUETOOTH_SCAN",
+        "BLUETOOTH_CONNECT"
+      ]
     },
     "web": {
       "favicon": "./assets/favicon.png"
-    }
+    },
+    "plugins": [
+      "expo-sqlite",
+      [
+        "expo-location",
+        {
+          "locationAlwaysAndWhenInUsePermission": "bincio-rec records your GPS track during activities.",
+          "isAndroidBackgroundLocationEnabled": true,
+          "isAndroidForegroundServiceEnabled": true
+        }
+      ],
+      [
+        "expo-notifications",
+        {
+          "icon": "./assets/icon.png",
+          "color": "#3b82f6"
+        }
+      ]
+    ]
   }
 }
diff --git a/package-lock.json b/package-lock.json
index e314f9f..c6d08c1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,10 +8,29 @@
       "name": "bincio_rec_scaffold",
       "version": "1.0.0",
       "dependencies": {
+        "@maplibre/maplibre-react-native": "^11.3.2",
+        "@react-native-async-storage/async-storage": "^3.1.1",
+        "@react-navigation/bottom-tabs": "^7.16.2",
+        "@react-navigation/native": "^7.2.5",
+        "@react-navigation/native-stack": "^7.16.0",
         "expo": "~56.0.8",
+        "expo-av": "^16.0.8",
+        "expo-crypto": "^56.0.4",
+        "expo-file-system": "~56.0.7",
+        "expo-keep-awake": "~56.0.3",
+        "expo-location": "~56.0.15",
+        "expo-notifications": "~56.0.15",
+        "expo-sharing": "^56.0.15",
+        "expo-sqlite": "~56.0.4",
         "expo-status-bar": "~56.0.4",
+        "expo-task-manager": "~56.0.16",
         "react": "19.2.3",
-        "react-native": "0.85.3"
+        "react-native": "0.85.3",
+        "react-native-ble-plx": "^3.5.1",
+        "react-native-gesture-handler": "~2.31.1",
+        "react-native-safe-area-context": "~5.7.0",
+        "react-native-screens": "4.25.2",
+        "zustand": "^5.0.14"
       },
       "devDependencies": {
         "@types/react": "~19.2.2",
@@ -1063,6 +1082,18 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@egjs/hammerjs": {
+      "version": "2.0.17",
+      "resolved": "https://registry.npmjs.org/@egjs/hammerjs/-/hammerjs-2.0.17.tgz",
+      "integrity": "sha512-XQsZgjm2EcVUiZQf11UBJQfmZeEmOW8DpI1gsFeln6w0ae0ii4dMQEQ0kjl6DspdWX1aGY1/loyXnP0JS06e/A==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/hammerjs": "^2.0.36"
+      },
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
     "node_modules/@expo/code-signing-certificates": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/@expo/code-signing-certificates/-/code-signing-certificates-0.0.6.tgz",
@@ -1496,6 +1527,70 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@mapbox/jsonlint-lines-primitives": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@mapbox/jsonlint-lines-primitives/-/jsonlint-lines-primitives-2.0.2.tgz",
+      "integrity": "sha512-rY0o9A5ECsTQRVhv7tL/OyDpGAoUB4tTvLiW1DSzQGq4bvTPhNw1VpSNjDJc5GFZ2XuyOtSWSVN05qOtcD71qQ==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/@mapbox/unitbezier": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/@mapbox/unitbezier/-/unitbezier-0.0.1.tgz",
+      "integrity": "sha512-nMkuDXFv60aBr9soUG5q+GvZYL+2KZHVvsqFCzqnkGEf46U2fvmytHaEVc1/YZbiLn8X+eR3QzX1+dwDO1lxlw==",
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/@maplibre/maplibre-gl-style-spec": {
+      "version": "24.8.5",
+      "resolved": "https://registry.npmjs.org/@maplibre/maplibre-gl-style-spec/-/maplibre-gl-style-spec-24.8.5.tgz",
+      "integrity": "sha512-EzEJmMt6thioRH7GI9LWS7ahXTcAhAPGWCe6oTP2Ps4YnsXOOAfeqx854lZaiDnwURfHmcCKV1mr6oo0i23x6w==",
+      "license": "ISC",
+      "dependencies": {
+        "@mapbox/jsonlint-lines-primitives": "~2.0.2",
+        "@mapbox/unitbezier": "^0.0.1",
+        "json-stringify-pretty-compact": "^4.0.0",
+        "minimist": "^1.2.8",
+        "quickselect": "^3.0.0",
+        "tinyqueue": "^3.0.0"
+      },
+      "bin": {
+        "gl-style-format": "dist/gl-style-format.mjs",
+        "gl-style-migrate": "dist/gl-style-migrate.mjs",
+        "gl-style-validate": "dist/gl-style-validate.mjs"
+      }
+    },
+    "node_modules/@maplibre/maplibre-react-native": {
+      "version": "11.3.2",
+      "resolved": "https://registry.npmjs.org/@maplibre/maplibre-react-native/-/maplibre-react-native-11.3.2.tgz",
+      "integrity": "sha512-wiATUec6sIMqFbesaR9UeQLvVP8/PDg0DbTdKt2DWyNgoqVKnZesp6y64P1s68GbgwMYcvNS5QorzIfFUVIybQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@maplibre/maplibre-gl-style-spec": "24.8.5",
+        "@turf/distance": "^7.3.5",
+        "@turf/helpers": "^7.3.5",
+        "@turf/length": "^7.3.5",
+        "@turf/nearest-point-on-line": "^7.3.5"
+      },
+      "peerDependencies": {
+        "@expo/config-plugins": ">=54.0.0",
+        "@types/geojson": "^7946.0.0",
+        "@types/react": ">=19.1.0",
+        "react": ">=19.1.0",
+        "react-native": ">=0.80.0"
+      },
+      "peerDependenciesMeta": {
+        "@expo/config-plugins": {
+          "optional": true
+        },
+        "@types/geojson": {
+          "optional": true
+        },
+        "@types/react": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@msgpackr-extract/msgpackr-extract-darwin-arm64": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/@msgpackr-extract/msgpackr-extract-darwin-arm64/-/msgpackr-extract-darwin-arm64-3.0.4.tgz",
@@ -1574,6 +1669,19 @@
         "win32"
       ]
     },
+    "node_modules/@react-native-async-storage/async-storage": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/@react-native-async-storage/async-storage/-/async-storage-3.1.1.tgz",
+      "integrity": "sha512-z+PnLz1n6ECKhgoHZHkfc+dijXZEyZnNFSajbtE0NEbsJhmX8x9GlOeiMQIKX2E4DUqPSgfIh4FYBv1M49KgPQ==",
+      "license": "MIT",
+      "dependencies": {
+        "idb": "8.0.3"
+      },
+      "peerDependencies": {
+        "react": "*",
+        "react-native": "*"
+      }
+    },
     "node_modules/@react-native/assets-registry": {
       "version": "0.85.3",
       "resolved": "https://registry.npmjs.org/@react-native/assets-registry/-/assets-registry-0.85.3.tgz",
@@ -1755,12 +1863,224 @@
         }
       }
     },
+    "node_modules/@react-navigation/bottom-tabs": {
+      "version": "7.16.2",
+      "resolved": "https://registry.npmjs.org/@react-navigation/bottom-tabs/-/bottom-tabs-7.16.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@react-navigation/elements": "^2.9.19",
+        "color": "^4.2.3",
+        "sf-symbols-typescript": "^2.1.0"
+      },
+      "peerDependencies": {
+        "@react-navigation/native": "^7.2.5",
+        "react": ">= 18.2.0",
+        "react-native": "*",
+        "react-native-safe-area-context": ">= 4.0.0",
+        "react-native-screens": ">= 4.0.0"
+      }
+    },
+    "node_modules/@react-navigation/core": {
+      "version": "7.17.5",
+      "resolved": "https://registry.npmjs.org/@react-navigation/core/-/core-7.17.5.tgz",
+      "integrity": "sha512-6fDCwDTWC7DJn0SDb9DJGRlipaygHIc+2elpZBJI6Crl/2Pu+Z1d6W4jMJ2gZO6iHKf+Pe5sUiQ/uwepGprZtg==",
+      "license": "MIT",
+      "dependencies": {
+        "@react-navigation/routers": "^7.5.5",
+        "escape-string-regexp": "^4.0.0",
+        "fast-deep-equal": "^3.1.3",
+        "nanoid": "^3.3.11",
+        "query-string": "^7.1.3",
+        "react-is": "^19.1.0",
+        "use-latest-callback": "^0.2.4",
+        "use-sync-external-store": "^1.5.0"
+      },
+      "peerDependencies": {
+        "react": ">= 18.2.0"
+      }
+    },
+    "node_modules/@react-navigation/core/node_modules/react-is": {
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+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-19.2.7.tgz",
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+    },
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+      "resolved": "https://registry.npmjs.org/@react-navigation/elements/-/elements-2.9.19.tgz",
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+        "@react-navigation/native": "^7.2.5",
+        "react": ">= 18.2.0",
+        "react-native": "*",
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+        "escape-string-regexp": "^4.0.0",
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+        "react": ">= 18.2.0",
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+        "react-native-safe-area-context": ">= 4.0.0",
+        "react-native-screens": ">= 4.0.0"
+      }
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+    "node_modules/@react-navigation/routers": {
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+      "resolved": "https://registry.npmjs.org/@react-navigation/routers/-/routers-7.5.5.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "nanoid": "^3.3.11"
+      }
+    },
     "node_modules/@sinclair/typebox": {
       "version": "0.27.10",
       "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
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       "license": "MIT"
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         "node": ">=8"
       }
     },
+    "node_modules/filter-obj": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/filter-obj/-/filter-obj-1.1.0.tgz",
+      "integrity": "sha512-8rXg1ZnX7xzy2NGDVkBVaAy+lSlPNwad13BtgSlLuxfIslyt5Vg64U7tFcCt4WS1R0hvtnQybT/IyCkGZ3DpXQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
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       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
@@ -3393,6 +3887,21 @@
         "hermes-estree": "0.35.0"
       }
     },
+    "node_modules/hoist-non-react-statics": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/hoist-non-react-statics/-/hoist-non-react-statics-3.3.2.tgz",
+      "integrity": "sha512-/gGivxi8JPKWNm/W0jSmzcMPpfpPLc3dY/6GxhX2hQ9iGj3aDfklV4ET7NjKpSinLpJ5vafa9iiGIEZg10SfBw==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "react-is": "^16.7.0"
+      }
+    },
+    "node_modules/hoist-non-react-statics/node_modules/react-is": {
+      "version": "16.13.1",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",
+      "integrity": "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==",
+      "license": "MIT"
+    },
     "node_modules/hosted-git-info": {
       "version": "7.0.2",
       "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-7.0.2.tgz",
@@ -3453,6 +3962,12 @@
         "node": ">= 14"
       }
     },
+    "node_modules/idb": {
+      "version": "8.0.3",
+      "resolved": "https://registry.npmjs.org/idb/-/idb-8.0.3.tgz",
+      "integrity": "sha512-LtwtVyVYO5BqRvcsKuB2iUMnHwPVByPCXFXOpuU96IZPPoPN6xjOGxZQ74pgSVVLQWtUOYgyeL4GE98BY5D3wg==",
+      "license": "ISC"
+    },
     "node_modules/ignore": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.2.tgz",
@@ -3492,6 +4007,12 @@
         "loose-envify": "^1.0.0"
       }
     },
+    "node_modules/is-arrayish": {
+      "version": "0.3.4",
+      "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.4.tgz",
+      "integrity": "sha512-m6UrgzFVUYawGBh1dUsWR5M2Clqic9RVXC/9f8ceNlv2IcO9j9J/z8UoCLPqtsPBFNzEpfR3xftohbfqDx8EQA==",
+      "license": "MIT"
+    },
     "node_modules/is-core-module": {
       "version": "2.16.2",
       "resolved": "https://registry.npmjs.org/is-core-module/-/is-core-module-2.16.2.tgz",
@@ -3698,6 +4219,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/json-stringify-pretty-compact": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/json-stringify-pretty-compact/-/json-stringify-pretty-compact-4.0.0.tgz",
+      "integrity": "sha512-3CNZ2DnrpByG9Nqj6Xo8vqbjT4F6N+tb4Gb28ESAZjYZ5yqvmc56J+/kuIwkaAMOyblTQhUW7PxMkUb8Q36N3Q==",
+      "license": "MIT"
+    },
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       "version": "2.2.3",
       "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
@@ -4508,6 +5035,15 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/minimist": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
+      "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/minipass": {
       "version": "7.1.3",
       "resolved": "https://registry.npmjs.org/minipass/-/minipass-7.1.3.tgz",
@@ -5034,6 +5570,24 @@
         "node": ">= 6"
       }
     },
+    "node_modules/query-string": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/query-string/-/query-string-7.1.3.tgz",
+      "integrity": "sha512-hh2WYhq4fi8+b+/2Kg9CEge4fDPvHS534aOOvOZeQ3+Vf2mCFsaFBYj0i+iXcAq6I9Vzp5fjMFBlONvayDC1qg==",
+      "license": "MIT",
+      "dependencies": {
+        "decode-uri-component": "^0.2.2",
+        "filter-obj": "^1.1.0",
+        "split-on-first": "^1.0.0",
+        "strict-uri-encode": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/queue": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/queue/-/queue-6.0.2.tgz",
@@ -5043,6 +5597,12 @@
         "inherits": "~2.0.3"
       }
     },
+    "node_modules/quickselect": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/quickselect/-/quickselect-3.0.0.tgz",
+      "integrity": "sha512-XdjUArbK4Bm5fLLvlm5KpTFOiOThgfWWI4axAZDWg4E/0mKdZyI9tNEfds27qCi1ze/vwTR16kvmmGhRra3c2g==",
+      "license": "ISC"
+    },
     "node_modules/range-parser": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
@@ -5071,6 +5631,18 @@
         "ws": "^7"
       }
     },
+    "node_modules/react-freeze": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/react-freeze/-/react-freeze-1.0.4.tgz",
+      "integrity": "sha512-r4F0Sec0BLxWicc7HEyo2x3/2icUTrRmDjaaRyzzn+7aDyFZliszMDOgLVwSnQnYENOlL1o569Ze2HZefk8clA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "peerDependencies": {
+        "react": ">=17.0.0"
+      }
+    },
     "node_modules/react-is": {
       "version": "18.3.1",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-18.3.1.tgz",
@@ -5136,6 +5708,59 @@
         }
       }
     },
+    "node_modules/react-native-ble-plx": {
+      "version": "3.5.1",
+      "resolved": "https://registry.npmjs.org/react-native-ble-plx/-/react-native-ble-plx-3.5.1.tgz",
+      "integrity": "sha512-SxksmrUt9jG6DOarrrdkb5c/HBLSfZOKauo/9VQSSi3WJA4bmF78GkrtXrgSoGNk0m1ksacFTjB5DuL39xZq/g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 18.0.0"
+      },
+      "peerDependencies": {
+        "react": "*",
+        "react-native": "*"
+      }
+    },
+    "node_modules/react-native-gesture-handler": {
+      "version": "2.31.2",
+      "resolved": "https://registry.npmjs.org/react-native-gesture-handler/-/react-native-gesture-handler-2.31.2.tgz",
+      "integrity": "sha512-rw5q74i2AfS7YGYdbxQDhOU7xqgY6WRM1132/CCm3erqjblhECZDZFHIm0tteHoC9ih24wogVBVVzcTBQtZ+5A==",
+      "license": "MIT",
+      "dependencies": {
+        "@egjs/hammerjs": "^2.0.17",
+        "@types/react-test-renderer": "^19.1.0",
+        "hoist-non-react-statics": "^3.3.0",
+        "invariant": "^2.2.4"
+      },
+      "peerDependencies": {
+        "react": "*",
+        "react-native": "*"
+      }
+    },
+    "node_modules/react-native-safe-area-context": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/react-native-safe-area-context/-/react-native-safe-area-context-5.7.0.tgz",
+      "integrity": "sha512-/9/MtQz8ODphjsLdZ+GZAIcC/RtoqW9EeShf7Uvnfgm/pzYrJ75y3PV/J1wuAV1T5Dye5ygq4EAW20RoBq0ABQ==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "*",
+        "react-native": "*"
+      }
+    },
+    "node_modules/react-native-screens": {
+      "version": "4.25.2",
+      "resolved": "https://registry.npmjs.org/react-native-screens/-/react-native-screens-4.25.2.tgz",
+      "integrity": "sha512-1Nj1fusFd+rIMKU/qC9yGKVG+3ofh11d3OdBQKL1iVvQfKvcB8vhvTGQf2TkfxW3bamxN+hCZIXmNuU0mRkyDg==",
+      "license": "MIT",
+      "dependencies": {
+        "react-freeze": "^1.0.0",
+        "warn-once": "^0.1.0"
+      },
+      "peerDependencies": {
+        "react": "*",
+        "react-native": ">=0.82.0"
+      }
+    },
     "node_modules/react-native/node_modules/commander": {
       "version": "12.1.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-12.1.0.tgz",
@@ -5426,6 +6051,15 @@
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       "license": "ISC"
     },
+    "node_modules/sf-symbols-typescript": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/sf-symbols-typescript/-/sf-symbols-typescript-2.2.0.tgz",
+      "integrity": "sha512-TPbeg0b7ylrswdGCji8FRGFAKuqbpQlLbL8SOle3j1iHSs5Ob5mhvMAxWN2UItOjgALAB5Zp3fmMfj8mbWvXKw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -5476,6 +6110,15 @@
         "plist": "^3.0.5"
       }
     },
+    "node_modules/simple-swizzle": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.4.tgz",
+      "integrity": "sha512-nAu1WFPQSMNr2Zn9PGSZK9AGn4t/y97lEm+MXTtUDwfP0ksAIX4nO+6ruD9Jwut4C49SB1Ws+fbXsm/yScWOHw==",
+      "license": "MIT",
+      "dependencies": {
+        "is-arrayish": "^0.3.1"
+      }
+    },
     "node_modules/sisteransi": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/sisteransi/-/sisteransi-1.0.5.tgz",
@@ -5528,6 +6171,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/split-on-first": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/split-on-first/-/split-on-first-1.1.0.tgz",
+      "integrity": "sha512-43ZssAJaMusuKWL8sKUBQXHWOpq8d6CfN/u1p4gUzfJkM05C8rxTmYrkIPTXapZpORA6LkkzcUulJ8FqA7Uudw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/stackframe": {
       "version": "1.3.4",
       "resolved": "https://registry.npmjs.org/stackframe/-/stackframe-1.3.4.tgz",
@@ -5564,6 +6216,15 @@
         "node": ">= 0.10.0"
       }
     },
+    "node_modules/strict-uri-encode": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-2.0.0.tgz",
+      "integrity": "sha512-QwiXZgpRcKkhTj2Scnn++4PKtWsH0kpzZ62L2R6c/LUVYv7hVnZqcg2+sMuT6R7Jusu1vviK/MFsu6kNJfWlEQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/string-width": {
       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
@@ -5724,6 +6385,12 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/tinyqueue": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/tinyqueue/-/tinyqueue-3.0.0.tgz",
+      "integrity": "sha512-gRa9gwYU3ECmQYv3lslts5hxuIa90veaEcxDYuu3QGOIAEM2mOZkVHp48ANJuu1CURtRdHKUBY5Lm1tHV+sD4g==",
+      "license": "ISC"
+    },
     "node_modules/tmpl": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.5.tgz",
@@ -5757,6 +6424,12 @@
       "integrity": "sha512-FWAPzCIHZHnrE/5/w9MPk0kK25hSQSH2IKhYh9PyjS3SG/+IEMvlwIHbhz+oF7xl54I+ueZlVnMjyzdSwLmAwA==",
       "license": "MIT"
     },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+      "license": "0BSD"
+    },
     "node_modules/type-fest": {
       "version": "0.7.1",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.7.1.tgz",
@@ -5826,6 +6499,12 @@
         "node": ">=4"
       }
     },
+    "node_modules/unimodules-app-loader": {
+      "version": "56.0.1",
+      "resolved": "https://registry.npmjs.org/unimodules-app-loader/-/unimodules-app-loader-56.0.1.tgz",
+      "integrity": "sha512-Z801jeBOQMUF/ExklxT1BqhEV/oF2/Bii7PFYAj/8Sauxl7oKvZbf70peRzzAU0mG7UQ3yU/UO/EpD1JyJ2WcA==",
+      "license": "MIT"
+    },
     "node_modules/unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -5865,6 +6544,24 @@
         "browserslist": ">= 4.21.0"
       }
     },
+    "node_modules/use-latest-callback": {
+      "version": "0.2.6",
+      "resolved": "https://registry.npmjs.org/use-latest-callback/-/use-latest-callback-0.2.6.tgz",
+      "integrity": "sha512-FvRG9i1HSo0wagmX63Vrm8SnlUU3LMM3WyZkQ76RnslpBrX694AdG4A0zQBx2B3ZifFA0yv/BaEHGBnEax5rZg==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": ">=16.8"
+      }
+    },
+    "node_modules/use-sync-external-store": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz",
+      "integrity": "sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -5917,6 +6614,12 @@
         "makeerror": "1.0.12"
       }
     },
+    "node_modules/warn-once": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/warn-once/-/warn-once-0.1.1.tgz",
+      "integrity": "sha512-VkQZJbO8zVImzYFteBXvBOZEl1qL175WH8VmZcxF2fZAoudNhNDvHi+doCaAEdU2l2vtcIwa2zn0QK5+I1HQ3Q==",
+      "license": "MIT"
+    },
     "node_modules/wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
@@ -6100,6 +6803,35 @@
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
+    },
+    "node_modules/zustand": {
+      "version": "5.0.14",
+      "resolved": "https://registry.npmjs.org/zustand/-/zustand-5.0.14.tgz",
+      "integrity": "sha512-/8tAspM5LMPr28b3fwLYrtdj77ECpfZviaP75CMTnwO8ISyaE4GDIG/9rDDYq/cH9D2Xw2A2RXglLInmVBQB/g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.20.0"
+      },
+      "peerDependencies": {
+        "@types/react": ">=18.0.0",
+        "immer": ">=9.0.6",
+        "react": ">=18.0.0",
+        "use-sync-external-store": ">=1.2.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "immer": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "use-sync-external-store": {
+          "optional": true
+        }
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 1c86cc2..774fedb 100644
--- a/package.json
+++ b/package.json
@@ -3,10 +3,29 @@
   "version": "1.0.0",
   "main": "index.ts",
   "dependencies": {
+    "@maplibre/maplibre-react-native": "^11.3.2",
+    "@react-native-async-storage/async-storage": "^3.1.1",
+    "@react-navigation/bottom-tabs": "^7.16.2",
+    "@react-navigation/native": "^7.2.5",
+    "@react-navigation/native-stack": "^7.16.0",
     "expo": "~56.0.8",
+    "expo-av": "^16.0.8",
+    "expo-crypto": "^56.0.4",
+    "expo-file-system": "~56.0.7",
+    "expo-keep-awake": "~56.0.3",
+    "expo-location": "~56.0.15",
+    "expo-notifications": "~56.0.15",
+    "expo-sharing": "^56.0.15",
+    "expo-sqlite": "~56.0.4",
     "expo-status-bar": "~56.0.4",
+    "expo-task-manager": "~56.0.16",
     "react": "19.2.3",
-    "react-native": "0.85.3"
+    "react-native": "0.85.3",
+    "react-native-ble-plx": "^3.5.1",
+    "react-native-gesture-handler": "~2.31.1",
+    "react-native-safe-area-context": "~5.7.0",
+    "react-native-screens": "4.25.2",
+    "zustand": "^5.0.14"
   },
   "devDependencies": {
     "@types/react": "~19.2.2",
@@ -14,8 +33,8 @@
   },
   "scripts": {
     "start": "expo start",
-    "android": "expo start --android",
-    "ios": "expo start --ios",
+    "android": "expo run:android",
+    "ios": "expo run:ios",
     "web": "expo start --web"
   },
   "private": true
diff --git a/src/navigation/AppNavigator.tsx b/src/navigation/AppNavigator.tsx
new file mode 100644
index 0000000..d0893e4
--- /dev/null
+++ b/src/navigation/AppNavigator.tsx
@@ -0,0 +1,63 @@
+import React from 'react';
+import { NavigationContainer } from '@react-navigation/native';
+import { createNativeStackNavigator } from '@react-navigation/native-stack';
+import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
+import { Text } from 'react-native';
+
+import { RecordingScreen } from '../screens/RecordingScreen';
+import { PostRecordingScreen } from '../screens/PostRecordingScreen';
+import { SensorPairingScreen } from '../screens/SensorPairingScreen';
+import { SavedRecordingsScreen } from '../screens/SavedRecordingsScreen';
+import { SettingsScreen } from '../screens/SettingsScreen';
+import { RootStackParamList, TabParamList } from '../types';
+
+const Stack = createNativeStackNavigator<RootStackParamList>();
+const Tab = createBottomTabNavigator<TabParamList>();
+
+function Tabs() {
+  return (
+    <Tab.Navigator
+      screenOptions={{
+        headerStyle: { backgroundColor: '#111' },
+        headerTintColor: '#fff',
+        tabBarStyle: { backgroundColor: '#111', borderTopColor: '#222' },
+        tabBarActiveTintColor: '#3b82f6',
+        tabBarInactiveTintColor: '#555',
+      }}
+    >
+      <Tab.Screen
+        name="Recording"
+        component={RecordingScreen}
+        options={{ tabBarIcon: ({ color }) => <Text style={{ color, fontSize: 20 }}>⏺</Text> }}
+      />
+      <Tab.Screen
+        name="Saved"
+        component={SavedRecordingsScreen}
+        options={{ tabBarIcon: ({ color }) => <Text style={{ color, fontSize: 20 }}>📋</Text> }}
+      />
+      <Tab.Screen
+        name="Settings"
+        component={SettingsScreen}
+        options={{ tabBarIcon: ({ color }) => <Text style={{ color, fontSize: 20 }}>⚙️</Text> }}
+      />
+    </Tab.Navigator>
+  );
+}
+
+export function AppNavigator() {
+  return (
+    <NavigationContainer>
+      <Stack.Navigator
+        screenOptions={{
+          headerStyle: { backgroundColor: '#111' },
+          headerTintColor: '#fff',
+          contentStyle: { backgroundColor: '#111' },
+        }}
+      >
+        <Stack.Screen name="Tabs" component={Tabs} options={{ headerShown: false }} />
+        <Stack.Screen name="PostRecording" component={PostRecordingScreen} options={{ title: 'Save Recording', presentation: 'modal' }} />
+        <Stack.Screen name="SensorPairing" component={SensorPairingScreen} options={{ title: 'Sensors', presentation: 'modal' }} />
+      </Stack.Navigator>
+    </NavigationContainer>
+  );
+}
diff --git a/src/screens/PostRecordingScreen.tsx b/src/screens/PostRecordingScreen.tsx
new file mode 100644
index 0000000..11255bc
--- /dev/null
+++ b/src/screens/PostRecordingScreen.tsx
@@ -0,0 +1,106 @@
+import React, { useState } from 'react';
+import { View, Text, TextInput, StyleSheet, TouchableOpacity, Alert, ScrollView } from 'react-native';
+import { useNavigation } from '@react-navigation/native';
+import { useRecordingStore } from '../store/recording';
+import { saveGpx } from '../services/gpx';
+import { insertRecording } from '../services/db';
+import { SavedRecording } from '../types';
+import { randomUUID } from 'expo-crypto';
+
+export function PostRecordingScreen() {
+  const nav = useNavigation();
+  const { trackPoints, reset, getStats } = useRecordingStore();
+  const stats = getStats();
+  const [title, setTitle] = useState('');
+  const [saving, setSaving] = useState(false);
+
+  const formatDuration = (secs: number) => {
+    const h = Math.floor(secs / 3600).toString().padStart(2, '0');
+    const m = Math.floor((secs % 3600) / 60).toString().padStart(2, '0');
+    const s = (secs % 60).toString().padStart(2, '0');
+    return `${h}:${m}:${s}`;
+  };
+
+  async function handleSave() {
+    if (!title.trim()) { Alert.alert('Title required', 'Enter a title for this recording.'); return; }
+    setSaving(true);
+    try {
+      const filePath = saveGpx(trackPoints, title.trim());
+      const rec: SavedRecording = {
+        id: randomUUID(),
+        title: title.trim(),
+        date: new Date().toISOString(),
+        durationSeconds: stats.elapsedSeconds,
+        distanceMeters: stats.distanceMeters,
+        filePath,
+      };
+      await insertRecording(rec);
+      reset();
+      nav.goBack();
+    } catch (e: any) {
+      Alert.alert('Save failed', e?.message ?? 'Unknown error');
+    } finally {
+      setSaving(false);
+    }
+  }
+
+  function handleDiscard() {
+    Alert.alert('Discard recording?', 'This cannot be undone.', [
+      { text: 'Cancel', style: 'cancel' },
+      { text: 'Discard', style: 'destructive', onPress: () => { reset(); nav.goBack(); } },
+    ]);
+  }
+
+  return (
+    <ScrollView style={styles.container} contentContainerStyle={styles.content}>
+      <Text style={styles.heading}>Recording complete</Text>
+
+      <View style={styles.statsRow}>
+        <Stat label="Duration" value={formatDuration(stats.elapsedSeconds)} />
+        <Stat label="Distance" value={`${(stats.distanceMeters / 1000).toFixed(2)} km`} />
+        <Stat label="Avg Speed" value={`${stats.avgSpeedKph.toFixed(1)} km/h`} />
+        <Stat label="Elevation" value={`+${stats.elevationGainMeters.toFixed(0)} m`} />
+      </View>
+
+      <TextInput
+        style={styles.input}
+        placeholder="Activity title"
+        placeholderTextColor="#555"
+        value={title}
+        onChangeText={setTitle}
+        autoFocus
+      />
+
+      <TouchableOpacity style={[styles.btn, styles.btnSave]} onPress={handleSave} disabled={saving}>
+        <Text style={styles.btnText}>{saving ? 'Saving…' : 'Save'}</Text>
+      </TouchableOpacity>
+      <TouchableOpacity style={[styles.btn, styles.btnDiscard]} onPress={handleDiscard}>
+        <Text style={[styles.btnText, { color: '#ef4444' }]}>Discard</Text>
+      </TouchableOpacity>
+    </ScrollView>
+  );
+}
+
+function Stat({ label, value }: { label: string; value: string }) {
+  return (
+    <View style={styles.stat}>
+      <Text style={styles.statLabel}>{label}</Text>
+      <Text style={styles.statValue}>{value}</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, backgroundColor: '#111' },
+  content: { padding: 24, gap: 16 },
+  heading: { color: '#fff', fontSize: 24, fontWeight: '700', marginBottom: 8 },
+  statsRow: { flexDirection: 'row', flexWrap: 'wrap', gap: 12, marginBottom: 8 },
+  stat: { flex: 1, minWidth: '40%', backgroundColor: '#1e1e1e', borderRadius: 12, padding: 16 },
+  statLabel: { color: '#888', fontSize: 12, textTransform: 'uppercase' },
+  statValue: { color: '#fff', fontSize: 22, fontWeight: '600', marginTop: 4 },
+  input: { backgroundColor: '#1e1e1e', color: '#fff', borderRadius: 12, padding: 16, fontSize: 18 },
+  btn: { borderRadius: 12, padding: 16, alignItems: 'center' },
+  btnSave: { backgroundColor: '#22c55e' },
+  btnDiscard: { backgroundColor: '#1e1e1e' },
+  btnText: { fontSize: 16, fontWeight: '700', color: '#fff' },
+});
diff --git a/src/screens/RecordingScreen.tsx b/src/screens/RecordingScreen.tsx
new file mode 100644
index 0000000..bb62e6e
--- /dev/null
+++ b/src/screens/RecordingScreen.tsx
@@ -0,0 +1,120 @@
+import React, { useEffect, useRef, useState } from 'react';
+import { View, Text, StyleSheet, TouchableOpacity, Alert } from 'react-native';
+import { useNavigation } from '@react-navigation/native';
+import { NativeStackNavigationProp } from '@react-navigation/native-stack';
+import { useKeepAwake } from 'expo-keep-awake';
+import { useRecordingStore } from '../store/recording';
+import { startGpsRecording, stopGpsRecording, requestLocationPermissions } from '../services/gps';
+import { RootStackParamList } from '../types';
+
+type Nav = NativeStackNavigationProp<RootStackParamList>;
+
+export function RecordingScreen() {
+  const nav = useNavigation<Nav>();
+  const { status, ble, keepAwake, start, pause, resume, stop, getStats } = useRecordingStore();
+  const [stats, setStats] = useState(getStats());
+  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null);
+
+  useKeepAwake(); // TODO: make conditional on keepAwake toggle
+
+  useEffect(() => {
+    intervalRef.current = setInterval(() => setStats(getStats()), 1000);
+    return () => { if (intervalRef.current) clearInterval(intervalRef.current); };
+  }, []);
+
+  async function handleStart() {
+    const granted = await requestLocationPermissions();
+    if (!granted) {
+      Alert.alert('Permission required', 'Location permission is required to record.');
+      return;
+    }
+    start();
+    await startGpsRecording();
+  }
+
+  async function handleStop() {
+    await stopGpsRecording();
+    stop();
+    nav.navigate('PostRecording');
+  }
+
+  const formatDuration = (secs: number) => {
+    const h = Math.floor(secs / 3600).toString().padStart(2, '0');
+    const m = Math.floor((secs % 3600) / 60).toString().padStart(2, '0');
+    const s = (secs % 60).toString().padStart(2, '0');
+    return `${h}:${m}:${s}`;
+  };
+
+  return (
+    <View style={styles.container}>
+      <View style={styles.statsGrid}>
+        <StatBox label="Time" value={formatDuration(stats.elapsedSeconds)} />
+        <StatBox label="Distance" value={`${(stats.distanceMeters / 1000).toFixed(2)} km`} />
+        <StatBox label="Speed" value={`${stats.currentSpeedKph.toFixed(1)} km/h`} />
+        <StatBox label="Avg Speed" value={`${stats.avgSpeedKph.toFixed(1)} km/h`} />
+        <StatBox label="Elevation" value={`+${stats.elevationGainMeters.toFixed(0)} m`} />
+        <StatBox label="HR" value={ble.hr ? `${ble.hr} bpm` : '—'} />
+        <StatBox label="Power" value={ble.power ? `${ble.power} W` : '—'} />
+        <StatBox label="Cadence" value={ble.cadence ? `${ble.cadence} rpm` : '—'} />
+      </View>
+
+      {/* Map placeholder — MapLibre component goes here */}
+      <View style={styles.mapPlaceholder}>
+        <Text style={styles.mapPlaceholderText}>Map</Text>
+      </View>
+
+      <View style={styles.controls}>
+        {status === 'idle' && (
+          <TouchableOpacity style={[styles.btn, styles.btnStart]} onPress={handleStart}>
+            <Text style={styles.btnText}>Start</Text>
+          </TouchableOpacity>
+        )}
+        {status === 'recording' && (
+          <>
+            <TouchableOpacity style={[styles.btn, styles.btnPause]} onPress={pause}>
+              <Text style={styles.btnText}>Pause</Text>
+            </TouchableOpacity>
+            <TouchableOpacity style={[styles.btn, styles.btnStop]} onPress={handleStop}>
+              <Text style={styles.btnText}>Stop</Text>
+            </TouchableOpacity>
+          </>
+        )}
+        {status === 'paused' && (
+          <>
+            <TouchableOpacity style={[styles.btn, styles.btnStart]} onPress={resume}>
+              <Text style={styles.btnText}>Resume</Text>
+            </TouchableOpacity>
+            <TouchableOpacity style={[styles.btn, styles.btnStop]} onPress={handleStop}>
+              <Text style={styles.btnText}>Stop</Text>
+            </TouchableOpacity>
+          </>
+        )}
+      </View>
+    </View>
+  );
+}
+
+function StatBox({ label, value }: { label: string; value: string }) {
+  return (
+    <View style={styles.statBox}>
+      <Text style={styles.statLabel}>{label}</Text>
+      <Text style={styles.statValue}>{value}</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, backgroundColor: '#111' },
+  statsGrid: { flexDirection: 'row', flexWrap: 'wrap', padding: 8 },
+  statBox: { width: '25%', padding: 8, alignItems: 'center' },
+  statLabel: { color: '#888', fontSize: 11, textTransform: 'uppercase' },
+  statValue: { color: '#fff', fontSize: 18, fontWeight: '600', marginTop: 2 },
+  mapPlaceholder: { flex: 1, backgroundColor: '#1a1a2e', alignItems: 'center', justifyContent: 'center' },
+  mapPlaceholderText: { color: '#444', fontSize: 16 },
+  controls: { flexDirection: 'row', justifyContent: 'center', gap: 16, padding: 24 },
+  btn: { paddingVertical: 16, paddingHorizontal: 32, borderRadius: 50 },
+  btnStart: { backgroundColor: '#22c55e' },
+  btnPause: { backgroundColor: '#f59e0b' },
+  btnStop: { backgroundColor: '#ef4444' },
+  btnText: { color: '#fff', fontSize: 18, fontWeight: '700' },
+});
diff --git a/src/screens/SavedRecordingsScreen.tsx b/src/screens/SavedRecordingsScreen.tsx
new file mode 100644
index 0000000..04e311a
--- /dev/null
+++ b/src/screens/SavedRecordingsScreen.tsx
@@ -0,0 +1,105 @@
+import React, { useCallback, useState } from 'react';
+import { View, Text, StyleSheet, FlatList, TouchableOpacity, Alert, ActivityIndicator } from 'react-native';
+import { useFocusEffect } from '@react-navigation/native';
+import * as Sharing from 'expo-sharing';
+import { listRecordings, deleteRecording } from '../services/db';
+import { uploadGpx } from '../services/upload';
+import { SavedRecording } from '../types';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+
+export function SavedRecordingsScreen() {
+  const [recordings, setRecordings] = useState<SavedRecording[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [uploading, setUploading] = useState<string | null>(null);
+
+  useFocusEffect(
+    useCallback(() => {
+      listRecordings().then((r) => { setRecordings(r); setLoading(false); });
+    }, []),
+  );
+
+  async function handleShare(rec: SavedRecording) {
+    await Sharing.shareAsync(rec.filePath, { mimeType: 'application/gpx+xml', dialogTitle: rec.title });
+  }
+
+  async function handleUpload(rec: SavedRecording) {
+    const instanceUrl = await AsyncStorage.getItem('instanceUrl');
+    const apiToken = await AsyncStorage.getItem('apiToken');
+    if (!instanceUrl || !apiToken) {
+      Alert.alert('Not configured', 'Set your bincio instance URL and API token in Settings.');
+      return;
+    }
+    setUploading(rec.id);
+    const result = await uploadGpx(rec.filePath, instanceUrl, apiToken);
+    setUploading(null);
+    if (result.ok) Alert.alert('Uploaded', `"${rec.title}" uploaded successfully.`);
+    else Alert.alert('Upload failed', result.error);
+  }
+
+  function handleDelete(rec: SavedRecording) {
+    Alert.alert('Delete recording?', `"${rec.title}" will be removed.`, [
+      { text: 'Cancel', style: 'cancel' },
+      {
+        text: 'Delete',
+        style: 'destructive',
+        onPress: async () => {
+          await deleteRecording(rec.id);
+          setRecordings((prev) => prev.filter((r) => r.id !== rec.id));
+        },
+      },
+    ]);
+  }
+
+  const formatDuration = (secs: number) => {
+    const h = Math.floor(secs / 3600);
+    const m = Math.floor((secs % 3600) / 60);
+    return h > 0 ? `${h}h ${m}m` : `${m}m`;
+  };
+
+  if (loading) return <View style={styles.center}><ActivityIndicator color="#fff" /></View>;
+
+  return (
+    <View style={styles.container}>
+      <FlatList
+        data={recordings}
+        keyExtractor={(r) => r.id}
+        contentContainerStyle={styles.list}
+        renderItem={({ item }) => (
+          <View style={styles.card}>
+            <View style={styles.cardMeta}>
+              <Text style={styles.cardTitle}>{item.title}</Text>
+              <Text style={styles.cardSub}>
+                {new Date(item.date).toLocaleDateString()} · {formatDuration(item.durationSeconds)} · {(item.distanceMeters / 1000).toFixed(2)} km
+              </Text>
+            </View>
+            <View style={styles.cardActions}>
+              <TouchableOpacity onPress={() => handleShare(item)}>
+                <Text style={styles.action}>Export</Text>
+              </TouchableOpacity>
+              <TouchableOpacity onPress={() => handleUpload(item)} disabled={uploading === item.id}>
+                <Text style={styles.action}>{uploading === item.id ? '…' : 'Upload'}</Text>
+              </TouchableOpacity>
+              <TouchableOpacity onPress={() => handleDelete(item)}>
+                <Text style={[styles.action, { color: '#ef4444' }]}>Delete</Text>
+              </TouchableOpacity>
+            </View>
+          </View>
+        )}
+        ListEmptyComponent={<Text style={styles.empty}>No recordings yet.</Text>}
+      />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, backgroundColor: '#111' },
+  center: { flex: 1, backgroundColor: '#111', alignItems: 'center', justifyContent: 'center' },
+  list: { padding: 16, gap: 12 },
+  card: { backgroundColor: '#1e1e1e', borderRadius: 12, padding: 16 },
+  cardMeta: { marginBottom: 12 },
+  cardTitle: { color: '#fff', fontSize: 17, fontWeight: '600' },
+  cardSub: { color: '#888', fontSize: 13, marginTop: 4 },
+  cardActions: { flexDirection: 'row', gap: 20 },
+  action: { color: '#3b82f6', fontWeight: '600', fontSize: 15 },
+  empty: { color: '#555', textAlign: 'center', marginTop: 60 },
+});
diff --git a/src/screens/SensorPairingScreen.tsx b/src/screens/SensorPairingScreen.tsx
new file mode 100644
index 0000000..ba0a119
--- /dev/null
+++ b/src/screens/SensorPairingScreen.tsx
@@ -0,0 +1,91 @@
+import React, { useEffect, useState, useRef } from 'react';
+import { View, Text, StyleSheet, FlatList, TouchableOpacity, ActivityIndicator } from 'react-native';
+import { scanForDevices, connectDevice, subscribeHr, subscribePower } from '../services/ble';
+import { BleDevice } from '../types';
+
+const TYPE_LABEL: Record<BleDevice['type'], string> = {
+  hr: 'Heart Rate',
+  power: 'Power Meter',
+  cadence: 'Cadence',
+};
+
+export function SensorPairingScreen() {
+  const [scanning, setScanning] = useState(false);
+  const [devices, setDevices] = useState<BleDevice[]>([]);
+  const [paired, setPaired] = useState<Record<string, boolean>>({});
+  const stopScanRef = useRef<(() => void) | null>(null);
+
+  function startScan() {
+    setDevices([]);
+    setScanning(true);
+    stopScanRef.current = scanForDevices(
+      (device) => setDevices((prev) => prev.find((d) => d.id === device.id) ? prev : [...prev, device]),
+      () => setScanning(false),
+    );
+    setTimeout(() => { stopScanRef.current?.(); setScanning(false); }, 15000);
+  }
+
+  useEffect(() => () => { stopScanRef.current?.(); }, []);
+
+  async function handlePair(device: BleDevice) {
+    try {
+      const connected = await connectDevice(device.id);
+      if (device.type === 'hr') subscribeHr(connected);
+      if (device.type === 'power') subscribePower(connected);
+      setPaired((prev) => ({ ...prev, [device.id]: true }));
+    } catch {
+      // error silenced — user can retry
+    }
+  }
+
+  return (
+    <View style={styles.container}>
+      <Text style={styles.heading}>Sensor Pairing</Text>
+      <Text style={styles.sub}>Scan for nearby BLE sensors (HR, power, cadence).</Text>
+
+      <TouchableOpacity style={styles.scanBtn} onPress={startScan} disabled={scanning}>
+        {scanning ? <ActivityIndicator color="#fff" /> : <Text style={styles.scanBtnText}>Scan</Text>}
+      </TouchableOpacity>
+
+      <FlatList
+        data={devices}
+        keyExtractor={(d) => d.id}
+        style={styles.list}
+        renderItem={({ item }) => (
+          <View style={styles.deviceRow}>
+            <View>
+              <Text style={styles.deviceName}>{item.name}</Text>
+              <Text style={styles.deviceType}>{TYPE_LABEL[item.type]}</Text>
+            </View>
+            <TouchableOpacity
+              style={[styles.pairBtn, paired[item.id] && styles.pairBtnPaired]}
+              onPress={() => handlePair(item)}
+              disabled={!!paired[item.id]}
+            >
+              <Text style={styles.pairBtnText}>{paired[item.id] ? 'Connected' : 'Connect'}</Text>
+            </TouchableOpacity>
+          </View>
+        )}
+        ListEmptyComponent={
+          <Text style={styles.empty}>{scanning ? 'Scanning…' : 'No devices found. Tap Scan.'}</Text>
+        }
+      />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, backgroundColor: '#111', padding: 24 },
+  heading: { color: '#fff', fontSize: 24, fontWeight: '700' },
+  sub: { color: '#888', marginTop: 4, marginBottom: 20 },
+  scanBtn: { backgroundColor: '#3b82f6', borderRadius: 12, padding: 14, alignItems: 'center', marginBottom: 16 },
+  scanBtnText: { color: '#fff', fontSize: 16, fontWeight: '700' },
+  list: { flex: 1 },
+  deviceRow: { flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between', backgroundColor: '#1e1e1e', borderRadius: 12, padding: 16, marginBottom: 10 },
+  deviceName: { color: '#fff', fontSize: 16, fontWeight: '600' },
+  deviceType: { color: '#888', fontSize: 13, marginTop: 2 },
+  pairBtn: { backgroundColor: '#3b82f6', borderRadius: 8, paddingVertical: 8, paddingHorizontal: 16 },
+  pairBtnPaired: { backgroundColor: '#22c55e' },
+  pairBtnText: { color: '#fff', fontWeight: '600' },
+  empty: { color: '#555', textAlign: 'center', marginTop: 40 },
+});
diff --git a/src/screens/SettingsScreen.tsx b/src/screens/SettingsScreen.tsx
new file mode 100644
index 0000000..34872fd
--- /dev/null
+++ b/src/screens/SettingsScreen.tsx
@@ -0,0 +1,84 @@
+import React, { useEffect, useState } from 'react';
+import { View, Text, TextInput, StyleSheet, Switch, TouchableOpacity, Alert, ScrollView } from 'react-native';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+
+export function SettingsScreen() {
+  const [instanceUrl, setInstanceUrl] = useState('');
+  const [apiToken, setApiToken] = useState('');
+  const [kmNotifications, setKmNotifications] = useState(true);
+  const [saved, setSaved] = useState(false);
+
+  useEffect(() => {
+    (async () => {
+      const [url, token, km] = await Promise.all([
+        AsyncStorage.getItem('instanceUrl'),
+        AsyncStorage.getItem('apiToken'),
+        AsyncStorage.getItem('kmNotifications'),
+      ]);
+      if (url) setInstanceUrl(url);
+      if (token) setApiToken(token);
+      if (km !== null) setKmNotifications(km === 'true');
+    })();
+  }, []);
+
+  async function handleSave() {
+    await Promise.all([
+      AsyncStorage.setItem('instanceUrl', instanceUrl.trim()),
+      AsyncStorage.setItem('apiToken', apiToken.trim()),
+      AsyncStorage.setItem('kmNotifications', String(kmNotifications)),
+    ]);
+    setSaved(true);
+    setTimeout(() => setSaved(false), 2000);
+  }
+
+  return (
+    <ScrollView style={styles.container} contentContainerStyle={styles.content}>
+      <Text style={styles.sectionTitle}>bincio instance</Text>
+
+      <Text style={styles.label}>Instance URL</Text>
+      <TextInput
+        style={styles.input}
+        value={instanceUrl}
+        onChangeText={setInstanceUrl}
+        placeholder="https://bincio.example.com"
+        placeholderTextColor="#555"
+        autoCapitalize="none"
+        keyboardType="url"
+      />
+
+      <Text style={styles.label}>API Token</Text>
+      <TextInput
+        style={styles.input}
+        value={apiToken}
+        onChangeText={setApiToken}
+        placeholder="your-api-token"
+        placeholderTextColor="#555"
+        autoCapitalize="none"
+        secureTextEntry
+      />
+
+      <Text style={styles.sectionTitle}>Notifications</Text>
+
+      <View style={styles.row}>
+        <Text style={styles.rowLabel}>Kilometre alerts</Text>
+        <Switch value={kmNotifications} onValueChange={setKmNotifications} trackColor={{ true: '#3b82f6' }} />
+      </View>
+
+      <TouchableOpacity style={styles.saveBtn} onPress={handleSave}>
+        <Text style={styles.saveBtnText}>{saved ? 'Saved ✓' : 'Save'}</Text>
+      </TouchableOpacity>
+    </ScrollView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, backgroundColor: '#111' },
+  content: { padding: 24, gap: 12 },
+  sectionTitle: { color: '#888', fontSize: 13, textTransform: 'uppercase', letterSpacing: 0.8, marginTop: 16 },
+  label: { color: '#aaa', fontSize: 14, marginBottom: 4 },
+  input: { backgroundColor: '#1e1e1e', color: '#fff', borderRadius: 10, padding: 14, fontSize: 16 },
+  row: { flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between', backgroundColor: '#1e1e1e', borderRadius: 10, padding: 14 },
+  rowLabel: { color: '#fff', fontSize: 16 },
+  saveBtn: { backgroundColor: '#3b82f6', borderRadius: 12, padding: 16, alignItems: 'center', marginTop: 8 },
+  saveBtnText: { color: '#fff', fontSize: 16, fontWeight: '700' },
+});
diff --git a/src/services/ble.ts b/src/services/ble.ts
new file mode 100644
index 0000000..6af336b
--- /dev/null
+++ b/src/services/ble.ts
@@ -0,0 +1,98 @@
+import { BleManager, Device, Characteristic } from 'react-native-ble-plx';
+import { useRecordingStore } from '../store/recording';
+import { BleDevice } from '../types';
+
+// Standard GATT UUIDs
+const HR_SERVICE = '0000180d-0000-1000-8000-00805f9b34fb';
+const HR_MEASUREMENT = '00002a37-0000-1000-8000-00805f9b34fb';
+const CYCLING_POWER_SERVICE = '00001818-0000-1000-8000-00805f9b34fb';
+const CYCLING_POWER_MEASUREMENT = '00002a63-0000-1000-8000-00805f9b34fb';
+const CYCLING_SPEED_CADENCE_SERVICE = '00001816-0000-1000-8000-00805f9b34fb';
+const CSC_MEASUREMENT = '00002a5b-0000-1000-8000-00805f9b34fb';
+
+export const bleManager = new BleManager();
+
+export function scanForDevices(onFound: (device: BleDevice) => void, onError: (error: Error) => void): () => void {
+  bleManager.startDeviceScan(
+    [HR_SERVICE, CYCLING_POWER_SERVICE, CYCLING_SPEED_CADENCE_SERVICE],
+    { allowDuplicates: false },
+    (error, device) => {
+      if (error) { onError(error); return; }
+      if (!device?.name) return;
+
+      const type = device.serviceUUIDs?.includes(HR_SERVICE)
+        ? 'hr'
+        : device.serviceUUIDs?.includes(CYCLING_POWER_SERVICE)
+          ? 'power'
+          : 'cadence';
+
+      onFound({ id: device.id, name: device.name, type });
+    },
+  );
+  return () => bleManager.stopDeviceScan();
+}
+
+export async function connectDevice(deviceId: string): Promise<Device> {
+  const device = await bleManager.connectToDevice(deviceId);
+  await device.discoverAllServicesAndCharacteristics();
+  return device;
+}
+
+export function subscribeHr(device: Device): () => void {
+  const sub = device.monitorCharacteristicForService(
+    HR_SERVICE,
+    HR_MEASUREMENT,
+    (error, char) => {
+      if (error || !char?.value) return;
+      const hr = parseHrMeasurement(char.value);
+      useRecordingStore.getState().updateBle({ hr });
+    },
+  );
+  return () => sub.remove();
+}
+
+export function subscribePower(device: Device): () => void {
+  const sub = device.monitorCharacteristicForService(
+    CYCLING_POWER_SERVICE,
+    CYCLING_POWER_MEASUREMENT,
+    (error, char) => {
+      if (error || !char?.value) return;
+      const power = parsePowerMeasurement(char.value);
+      useRecordingStore.getState().updateBle({ power });
+    },
+  );
+  return () => sub.remove();
+}
+
+export function subscribeCadence(device: Device): () => void {
+  const sub = device.monitorCharacteristicForService(
+    CYCLING_SPEED_CADENCE_SERVICE,
+    CSC_MEASUREMENT,
+    (error, char) => {
+      if (error || !char?.value) return;
+      // cadence parsing requires stateful wheel/crank event tracking — stub for now
+    },
+  );
+  return () => sub.remove();
+}
+
+// HR Measurement characteristic: flags byte + uint8 (or uint16) BPM
+function parseHrMeasurement(base64: string): number {
+  const bytes = fromBase64(base64);
+  const flags = bytes[0];
+  return flags & 0x01 ? (bytes[2] << 8) | bytes[1] : bytes[1];
+}
+
+// Cycling Power Measurement: flags (uint16) + instantaneous power (int16) at offset 2
+function parsePowerMeasurement(base64: string): number {
+  const bytes = fromBase64(base64);
+  const raw = (bytes[3] << 8) | bytes[2];
+  return raw >= 0x8000 ? raw - 0x10000 : raw;
+}
+
+function fromBase64(base64: string): Uint8Array {
+  const binary = atob(base64);
+  const bytes = new Uint8Array(binary.length);
+  for (let i = 0; i < binary.length; i++) bytes[i] = binary.charCodeAt(i);
+  return bytes;
+}
diff --git a/src/services/db.ts b/src/services/db.ts
new file mode 100644
index 0000000..c2b4571
--- /dev/null
+++ b/src/services/db.ts
@@ -0,0 +1,47 @@
+import * as SQLite from 'expo-sqlite';
+import { SavedRecording } from '../types';
+
+let db: SQLite.SQLiteDatabase | null = null;
+
+async function getDb(): Promise<SQLite.SQLiteDatabase> {
+  if (!db) {
+    db = await SQLite.openDatabaseAsync('bincio_rec.db');
+    await db.execAsync(`
+      CREATE TABLE IF NOT EXISTS recordings (
+        id TEXT PRIMARY KEY,
+        title TEXT NOT NULL,
+        date TEXT NOT NULL,
+        duration_seconds INTEGER NOT NULL,
+        distance_meters REAL NOT NULL,
+        file_path TEXT NOT NULL
+      );
+    `);
+  }
+  return db;
+}
+
+export async function insertRecording(rec: SavedRecording): Promise<void> {
+  const d = await getDb();
+  await d.runAsync(
+    'INSERT INTO recordings (id, title, date, duration_seconds, distance_meters, file_path) VALUES (?, ?, ?, ?, ?, ?)',
+    [rec.id, rec.title, rec.date, rec.durationSeconds, rec.distanceMeters, rec.filePath],
+  );
+}
+
+export async function listRecordings(): Promise<SavedRecording[]> {
+  const d = await getDb();
+  const rows = await d.getAllAsync<any>('SELECT * FROM recordings ORDER BY date DESC');
+  return rows.map((r) => ({
+    id: r.id,
+    title: r.title,
+    date: r.date,
+    durationSeconds: r.duration_seconds,
+    distanceMeters: r.distance_meters,
+    filePath: r.file_path,
+  }));
+}
+
+export async function deleteRecording(id: string): Promise<void> {
+  const d = await getDb();
+  await d.runAsync('DELETE FROM recordings WHERE id = ?', [id]);
+}
diff --git a/src/services/gps.ts b/src/services/gps.ts
new file mode 100644
index 0000000..726ef9c
--- /dev/null
+++ b/src/services/gps.ts
@@ -0,0 +1,49 @@
+import * as Location from 'expo-location';
+import * as TaskManager from 'expo-task-manager';
+import { useRecordingStore } from '../store/recording';
+
+const BACKGROUND_LOCATION_TASK = 'background-location-task';
+
+TaskManager.defineTask(BACKGROUND_LOCATION_TASK, async ({ data, error }: any) => {
+  if (error) return;
+  const locations: Location.LocationObject[] = data?.locations ?? [];
+  const { status, addTrackPoint, ble } = useRecordingStore.getState();
+  if (status !== 'recording') return;
+
+  for (const loc of locations) {
+    addTrackPoint({
+      lat: loc.coords.latitude,
+      lon: loc.coords.longitude,
+      ele: loc.coords.altitude ?? 0,
+      time: new Date(loc.timestamp),
+      hr: ble.hr,
+      power: ble.power,
+      cad: ble.cadence,
+    });
+  }
+});
+
+export async function requestLocationPermissions(): Promise<boolean> {
+  const { status: fg } = await Location.requestForegroundPermissionsAsync();
+  if (fg !== 'granted') return false;
+  const { status: bg } = await Location.requestBackgroundPermissionsAsync();
+  return bg === 'granted';
+}
+
+export async function startGpsRecording(): Promise<void> {
+  await Location.startLocationUpdatesAsync(BACKGROUND_LOCATION_TASK, {
+    accuracy: Location.Accuracy.BestForNavigation,
+    timeInterval: 1000,
+    distanceInterval: 0,
+    showsBackgroundLocationIndicator: true,
+    foregroundService: {
+      notificationTitle: 'bincio-rec',
+      notificationBody: 'Recording your activity',
+    },
+  });
+}
+
+export async function stopGpsRecording(): Promise<void> {
+  const isRunning = await Location.hasStartedLocationUpdatesAsync(BACKGROUND_LOCATION_TASK);
+  if (isRunning) await Location.stopLocationUpdatesAsync(BACKGROUND_LOCATION_TASK);
+}
diff --git a/src/services/gpx.ts b/src/services/gpx.ts
new file mode 100644
index 0000000..daad853
--- /dev/null
+++ b/src/services/gpx.ts
@@ -0,0 +1,64 @@
+import { File, Directory, Paths } from 'expo-file-system';
+import { TrackPoint } from '../types';
+
+function recordingsDir(): Directory {
+  return new Directory(Paths.document, 'recordings');
+}
+
+export function ensureRecordingsDir(): void {
+  const dir = recordingsDir();
+  if (!dir.exists) dir.create();
+}
+
+export function saveGpx(trackPoints: TrackPoint[], title: string): string {
+  ensureRecordingsDir();
+  const filename = `${sanitizeFilename(title)}_${Date.now()}.gpx`;
+  const file = new File(recordingsDir(), filename);
+  file.write(buildGpx(trackPoints, title));
+  return file.uri;
+}
+
+export function buildGpx(trackPoints: TrackPoint[], title: string): string {
+  const trkpts = trackPoints.map(buildTrkpt).join('\n');
+  return `<?xml version="1.0" encoding="UTF-8"?>
+<gpx version="1.1" creator="bincio-rec"
+  xmlns="http://www.topografix.com/GPX/1/1"
+  xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1">
+  <metadata><name>${escapeXml(title)}</name></metadata>
+  <trk>
+    <name>${escapeXml(title)}</name>
+    <trkseg>
+${trkpts}
+    </trkseg>
+  </trk>
+</gpx>`;
+}
+
+function buildTrkpt(pt: TrackPoint): string {
+  const ext = buildExtensions(pt);
+  return `      <trkpt lat="${pt.lat}" lon="${pt.lon}">
+        <ele>${pt.ele.toFixed(1)}</ele>
+        <time>${pt.time.toISOString()}</time>${ext}
+      </trkpt>`;
+}
+
+function buildExtensions(pt: TrackPoint): string {
+  if (pt.hr == null && pt.power == null && pt.cad == null) return '';
+  const hr = pt.hr != null ? `<gpxtpx:hr>${pt.hr}</gpxtpx:hr>` : '';
+  const power = pt.power != null ? `<gpxtpx:power>${pt.power}</gpxtpx:power>` : '';
+  const cad = pt.cad != null ? `<gpxtpx:cad>${pt.cad}</gpxtpx:cad>` : '';
+  return `
+        <extensions>
+          <gpxtpx:TrackPointExtension>
+            ${hr}${power}${cad}
+          </gpxtpx:TrackPointExtension>
+        </extensions>`;
+}
+
+function escapeXml(s: string): string {
+  return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
+}
+
+function sanitizeFilename(s: string): string {
+  return s.replace(/[^a-zA-Z0-9_-]/g, '_').slice(0, 64);
+}
diff --git a/src/services/upload.ts b/src/services/upload.ts
new file mode 100644
index 0000000..bc24202
--- /dev/null
+++ b/src/services/upload.ts
@@ -0,0 +1,27 @@
+import { File, UploadType } from 'expo-file-system';
+
+interface UploadResult {
+  ok: boolean;
+  error?: string;
+}
+
+export async function uploadGpx(
+  fileUri: string,
+  instanceUrl: string,
+  apiToken: string,
+): Promise<UploadResult> {
+  const url = instanceUrl.replace(/\/$/, '') + '/api/upload/raw';
+  try {
+    const file = new File(fileUri);
+    const result = await file.upload(url, {
+      httpMethod: 'POST',
+      uploadType: UploadType.MULTIPART,
+      fieldName: 'file',
+      headers: { Authorization: `Bearer ${apiToken}` },
+    });
+    if (result.status >= 200 && result.status < 300) return { ok: true };
+    return { ok: false, error: `HTTP ${result.status}` };
+  } catch (e: any) {
+    return { ok: false, error: e?.message ?? 'Unknown error' };
+  }
+}
diff --git a/src/store/recording.ts b/src/store/recording.ts
new file mode 100644
index 0000000..b507f4b
--- /dev/null
+++ b/src/store/recording.ts
@@ -0,0 +1,100 @@
+import { create } from 'zustand';
+import { TrackPoint, BleData, RecordingStats } from '../types';
+
+type RecordingStatus = 'idle' | 'recording' | 'paused';
+
+interface RecordingStore {
+  status: RecordingStatus;
+  startTime: Date | null;
+  pausedAt: Date | null;
+  totalPausedMs: number;
+  trackPoints: TrackPoint[];
+  ble: BleData;
+  keepAwake: boolean;
+
+  start: () => void;
+  pause: () => void;
+  resume: () => void;
+  stop: () => void;
+  addTrackPoint: (point: TrackPoint) => void;
+  updateBle: (data: Partial<BleData>) => void;
+  setKeepAwake: (value: boolean) => void;
+  reset: () => void;
+  getStats: () => RecordingStats;
+}
+
+export const useRecordingStore = create<RecordingStore>((set, get) => ({
+  status: 'idle',
+  startTime: null,
+  pausedAt: null,
+  totalPausedMs: 0,
+  trackPoints: [],
+  ble: {},
+  keepAwake: true,
+
+  start: () => set({ status: 'recording', startTime: new Date(), pausedAt: null, totalPausedMs: 0, trackPoints: [] }),
+
+  pause: () => set((s) => s.status === 'recording' ? { status: 'paused', pausedAt: new Date() } : s),
+
+  resume: () =>
+    set((s) => {
+      if (s.status !== 'paused' || !s.pausedAt) return s;
+      return {
+        status: 'recording',
+        pausedAt: null,
+        totalPausedMs: s.totalPausedMs + (Date.now() - s.pausedAt.getTime()),
+      };
+    }),
+
+  stop: () => set({ status: 'idle' }),
+
+  addTrackPoint: (point) =>
+    set((s) => ({ trackPoints: [...s.trackPoints, point] })),
+
+  updateBle: (data) =>
+    set((s) => ({ ble: { ...s.ble, ...data } })),
+
+  setKeepAwake: (value) => set({ keepAwake: value }),
+
+  reset: () =>
+    set({ status: 'idle', startTime: null, pausedAt: null, totalPausedMs: 0, trackPoints: [], ble: {} }),
+
+  getStats: (): RecordingStats => {
+    const { startTime, totalPausedMs, trackPoints } = get();
+    if (!startTime) return { elapsedSeconds: 0, distanceMeters: 0, currentSpeedKph: 0, avgSpeedKph: 0, elevationGainMeters: 0 };
+
+    const elapsedSeconds = Math.floor((Date.now() - startTime.getTime() - totalPausedMs) / 1000);
+
+    let distanceMeters = 0;
+    let elevationGainMeters = 0;
+    for (let i = 1; i < trackPoints.length; i++) {
+      distanceMeters += haversineMeters(trackPoints[i - 1], trackPoints[i]);
+      const gain = trackPoints[i].ele - trackPoints[i - 1].ele;
+      if (gain > 0) elevationGainMeters += gain;
+    }
+
+    const avgSpeedKph = elapsedSeconds > 0 ? (distanceMeters / 1000) / (elapsedSeconds / 3600) : 0;
+
+    let currentSpeedKph = 0;
+    if (trackPoints.length >= 2) {
+      const last = trackPoints[trackPoints.length - 1];
+      const prev = trackPoints[trackPoints.length - 2];
+      const dt = (last.time.getTime() - prev.time.getTime()) / 1000;
+      if (dt > 0) currentSpeedKph = (haversineMeters(prev, last) / 1000) / (dt / 3600);
+    }
+
+    return { elapsedSeconds, distanceMeters, currentSpeedKph, avgSpeedKph, elevationGainMeters };
+  },
+}));
+
+function haversineMeters(a: { lat: number; lon: number }, b: { lat: number; lon: number }): number {
+  const R = 6371000;
+  const dLat = toRad(b.lat - a.lat);
+  const dLon = toRad(b.lon - a.lon);
+  const sinLat = Math.sin(dLat / 2);
+  const sinLon = Math.sin(dLon / 2);
+  const c = sinLat * sinLat + Math.cos(toRad(a.lat)) * Math.cos(toRad(b.lat)) * sinLon * sinLon;
+  return R * 2 * Math.atan2(Math.sqrt(c), Math.sqrt(1 - c));
+}
+
+const toRad = (deg: number) => (deg * Math.PI) / 180;
diff --git a/src/types/index.ts b/src/types/index.ts
new file mode 100644
index 0000000..599c200
--- /dev/null
+++ b/src/types/index.ts
@@ -0,0 +1,50 @@
+export interface TrackPoint {
+  lat: number;
+  lon: number;
+  ele: number;
+  time: Date;
+  hr?: number;
+  power?: number;
+  cad?: number;
+}
+
+export interface BleDevice {
+  id: string;
+  name: string;
+  type: 'hr' | 'power' | 'cadence';
+}
+
+export interface BleData {
+  hr?: number;
+  power?: number;
+  cadence?: number;
+}
+
+export interface RecordingStats {
+  elapsedSeconds: number;
+  distanceMeters: number;
+  currentSpeedKph: number;
+  avgSpeedKph: number;
+  elevationGainMeters: number;
+}
+
+export interface SavedRecording {
+  id: string;
+  title: string;
+  date: string;
+  durationSeconds: number;
+  distanceMeters: number;
+  filePath: string;
+}
+
+export type RootStackParamList = {
+  Tabs: undefined;
+  PostRecording: undefined;
+  SensorPairing: undefined;
+};
+
+export type TabParamList = {
+  Recording: undefined;
+  Saved: undefined;
+  Settings: undefined;
+};