MINERVA TAK is an Android application for tactical coordination of outdoor teams: airsoft, paintball, hiking, civil protection training, LARP events, prosumer training and field operations.

━━━ MAIN FEATURES ━━━

🗺 TACTICAL MAPS
• MapLibre vector engine with 3D terrain
• Offline maps (OSM, satellite) for operations without connectivity
• Coordinate formats: UTM, MGRS, DMS, WGS84
• NATO APP-6 symbology for waypoints and markers
• Multi-waypoint routes with elevation profile
• Custom geofences with entry/exit alerts
• GPX and KML import/export

💬 CHAT AND MESSAGING
• End-to-end encrypted text chat (E2E)
• X25519 encryption via Google Tink
• Group chat and direct messages
• Encrypted geolocated photo sharing
• Push notifications via Firebase

📻 PUSH-TO-TALK (PTT)
• Zello-style digital walkie-talkie
• Encrypted voice channels via LiveKit SFU
• Activation via device physical volume key
• Floor control coordinated via Firebase Realtime Database
• Foreground service for background use

🛰 MESHTASTIC INTEGRATION
• Native connection to LoRa Meshtastic radios via Bluetooth
• GPS position exchange over mesh radio
• Offline text messaging without internet or cell coverage
• Dedicated icons for contacts reachable via Mesh

📡 SCREEN STREAMING
• Live screen sharing to other operators
• Picture-in-Picture during map navigation
• Based on LiveKit SFU

📍 LOCATION TRACKING
• Real-time GPS sharing with team members
• Foreground service for continuous tracking even in background
• Tracks saved locally and exportable as GPX

⏱ TACTICAL TIMERS
• Local countdown timer with vibration/tone alarm
• Coordinated team timers synchronized via server
• Floating widget above the map

━━━ SECURITY AND PRIVACY ━━━

• Chat, waypoints, routes, geofences, notes, photos, audio: everything end-to-end encrypted
• Local database encrypted with SQLCipher (AES-256)
• No operational data readable by the server
• No advertising tracking, no profiling, no third-party sharing
• Registration via Google Sign In (verified) or email address
• Maximum 3 devices per email

━━━ ACCESSIBILITY SERVICE (Hardware PTT) ━━━

MINERVA TAK uses the Android Accessibility Service in a limited, disclosed way to enable the physical Volume Down key as a Push-to-Talk (PTT) trigger when the screen is off or locked.

What the service does:
• Detects ONLY presses of the Volume Down key (KEYCODE_VOLUME_DOWN)
• Starts PTT transmission on press, stops on release
• Operates with screen off (operationally required for tactical voice comms)

What the service does NOT do:
• Does not read screen content
• Does not capture other keys or user input
• Does not access data from other apps
• Does not collect, log or transmit any personal data
• Does not modify system settings

Why it is needed: no alternative Android API can detect hardware key presses when the screen is locked. The Accessibility Service is the only technically available path for a screen-off physical PTT button.

Opt-in and control: the service is strictly optional. The user must manually enable it in Settings → Accessibility → MINERVA TAK, and can disable it any time. PTT remains usable without the service via the on-screen button or a compatible Bluetooth microphone.

MINERVA TAK does NOT use the IsAccessibilityTool flag (not an accessibility app for disabled users).

━━━ EARLY ACCESS ━━━

MINERVA TAK is distributed free of charge in Early Access until November 30, 2026. At the end of the period the service will evolve: the terms and conditions of the next version will be communicated via email to registered users with reasonable advance notice.

━━━ REQUIREMENTS ━━━

• Android 8.0 (API 26) or later
• Internet connection for registration and cloud features
• Bluetooth (optional) for Meshtastic integration
• Active GPS for position sharing

━━━ CONTACT ━━━

Privacy Policy: minervasage.com/tak/privacy
Terms of Service: minervasage.com/tak/terms
Support: info.minervasage@gmail.com