10digit is an offline MGRS GPS for land navigation, military training, hunting, and search and rescue. It turns your phone into a field navigation instrument. It shows your position as a military grid reference - big, monospaced, and readable at a glance - and keeps working when the network does not.

FIELD HUD
- Your position in MGRS at 1 m precision, sized to read at arm's length
- Tap the readout to cycle MGRS, UTM, and latitude/longitude in decimal or DMS
- Date-time group, heading, horizontal accuracy, altitude, and ground speed
- One tap to copy your coordinate, one tap to mark it as a waypoint

NIGHT VISION MODE
The whole app switches to red on black so you can read your grid without wrecking your dark adaptation. Map imagery dims with it.

MAP
- MGRS grid overlay with labelled grid lines
- Scale bar and a ruler for measuring distance
- North-up or heading-up, with follow-me camera tracking
- Tap anywhere to drop a pin and save it
- Your waypoints, tracks, and overlays drawn on the map

OFFLINE MAPS
Download map regions before you go - by current viewport, current location, or a rectangle you draw. Downloads pause, resume, cancel, retry, and update, and they survive a reboot. Once a region is downloaded the map works in airplane mode.

WAYPOINTS AND OVERLAYS
- Create, edit, favorite, and delete waypoints
- Group them into overlays you can show and hide
- Import and export GPX, KML, KMZ, CSV, and GeoJSON
- Open a waypoint file shared from any other app
- Record tracks

TEAM OVERLAYS
Share an overlay with your team through an invite link. Waypoints are end-to-end encrypted, with optional passcode and auto-expiry.

TAK INTEGRATION (EXPERIMENTAL)
Exchange live positions and markers with ATAK, iTAK, WinTAK, and TAK Server. Import and export TAK data packages.

PLANNING TOOLS
- Range Tools: weapon emplacements, surface danger zones (SDZ), mortar impact areas, and phase lines
- Line of sight and elevation profiles from terrain data

MOVE BETWEEN APPS
Import and export MilGPS backups (.milgpsbackup), plus GPX, KML, KMZ, CSV, and GeoJSON. Encrypted backups keep everything password-protected.

WEAR OS
- A watch app with your current grid and one-tap waypoint marking
- Navigate to a phone-synced waypoint with bearing and distance
- Two watch face complications: Current Grid, and bearing and distance to your selected waypoint (Navigation)

PRIVACY
No account. No ads. No tracking. Anonymous usage analytics only if you opt in. Your waypoints and overlays are stored in an encrypted on-device database and never leave your phone unless you export them yourself.

Map data (c) OpenStreetMap contributors. Topographic maps courtesy of the U.S. Geological Survey.