TerraGrid: MGRS Tactical GPS

TerraGrid is precision land navigation for soldiers, hunters, search & rescue teams, surveyors and serious outdoors people. Your grid, your compass and your waypoints, working 100% offline.

WHAT'S DIFFERENT
• Real datum support: ED50, NAD27, NAD83, OSGB36, Tokyo, Pulkovo 1942 and custom 3/7-parameter transforms, plus local 3° Transverse Mercator grids that match legacy 1:25,000 map sheets.
• On-device AI field assistant (iOS 26+): "drop a rally point 100 m north of me", fully offline.
• Apple Watch, AR finder and Live Activities: your grid on your wrist, waypoints in your camera view, range on your lock screen.

COORDINATES & DATUMS
— MGRS, UTM, USNG, DD, DDM, DMS, GEOREF and Maidenhead, from 10 km to 1 m precision
— National grids by name: PUWG 1992/2000, Gauß-Krüger, Gauss-Boaga, TUREF, Lambert 93, SWEREF 99, ETRS-TM35FIN, ΕΓΣΑ87, PT-TM06, Lambert 2008 and Japan's plane rectangular systems
— Instant converter between every format and datum, with copy and share
— Coordinate OCR: point the camera at a paper map or a written grid and import it

MAP & POSITION
— Zoom-adaptive MGRS grid overlay with 100 km squares, zone boundaries and labels
— Big-type Position screen: date-time group (local + Zulu), grid, altitude MSL/HAE, accuracy, position averaging with CEP
— Offline map regions: download an area once, navigate without signal

WAYPOINTS, ROUTES & TRACKS
— Tactical waypoints with NATO-style symbols, folders and layers
— Routes with leg tables, terrain-aware time estimates, elevation profile and a printable route card PDF
— Track recording with elevation profile and backtrack
— GPX, KML and CSV import & export; QR hand-off between devices

COMPASS & FIELD TOOLS
— True, magnetic and grid north compass with offline WMM2025 declination, bearing lock and mils
— BMNT/EENT twilight, sun & moon, pace-count dead reckoning
— Grid-stamped photos with EXIF
— Voice guidance and red/green night mode

TEAM & SYSTEM
— Serverless team sharing over your own iCloud: no accounts, no servers
— Siri: "What's my grid?", home and lock screen widgets, Dynamic Island
— Apple Watch app with grid, compass and mark-position complications

PRIVACY
100% offline. Zero telemetry. Your location is shared only when you turn on team broadcasting, over your own iCloud.

One-time purchase. No subscriptions, no ads, no accounts.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://enfurbay.github.io/terragrid-site/privacy.html