GitHub - RedGridTactical/RedGridMGRS: DAGR-class MGRS navigator for iPhone — live 10-digit grid coordinates, 8 tactical tools, 6 radio-ready report templates, NATO voice readout. Open source. No tracking. Free on the App Store.

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Red Grid MGRS

DAGR-Class MGRS Navigator

App Store Google Play Product Hunt License No Tracking GitHub stars

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The military's DAGR (AN/PSN-13) costs $2,500 and weighs a pound. Red Grid MGRS puts the same core land navigation capabilities in your pocket — live 10-digit MGRS, magnetic declination, waypoints, bearing and distance — for free. No network required. No data collected. Open source.

Grid & Wayfinder Tools Reports Landscape
Grid tab Tools tab Reports tab Landscape

DAGR-Equivalent Features

  • Live MGRS coordinates — 4/6/8/10-digit precision, 1-meter resolution
  • Magnetic declination — WMM model, auto or manual offset
  • Waypoint storage — bearing and distance to any saved position
  • Back azimuth and dead reckoning — plot movement from a known point
  • Speed, elevation, heading — real-time sensor display
  • Full offline operation — zero cloud dependency

Beyond the DAGR — 9 Tactical Tools

The DAGR hardware doesn't include these. Red Grid MGRS does.

  • Back Azimuth calculator
  • Dead Reckoning plotter
  • Two-point Resection
  • Pace Count tracker
  • Magnetic Declination reference
  • Time-Distance-Speed solver
  • Sun & Moon position data
  • MGRS Precision selector (1m to 100km)
  • Photo Geostamp — burn MGRS + DTG onto any photo (Pro)

6 Radio-Ready Report Templates

Generate formatted reports ready to transmit over any net:

  • SALUTE (Size, Activity, Location, Unit, Time, Equipment)
  • 9-Line MEDEVAC request
  • SPOT report
  • ICS 201 incident briefing
  • CASEVAC request
  • ANGUS/CFF fire mission

Pricing

Free

Live MGRS display, 1 theme, 8 tactical tools, 3 report templates (SALUTE, 9-Line MEDEVAC, SPOT), 1 waypoint.

Pro Upgrade — $9.99 (one-time in-app purchase)

  • Saved Waypoint Lists — patrol routes, OBJs, rally points, persisted on device
  • All 6 Report Templates — Standard includes SALUTE, MEDEVAC, SPOT
  • NATO Voice Readout — hands-free grid calls using phonetic alphabet
  • Shake to Speak — shake device for hands-free NATO grid readout
  • HUD Mode — full-screen tactical display with compass and wayfinder
  • Photo Geostamp — burn MGRS grid + DTG onto any photo, saved to camera roll
  • Grid Crossing Alerts — haptic feedback at 1km and 100m boundaries
  • Coordinate Formats — UTM, decimal degrees, DMS on the main grid display
  • 4 Display Themes — red lens, NVG green, day white, blue force
  • Unlimited Waypoints — no storage limits

No subscription. No recurring charges. One purchase, permanent unlock.

Install

iOS

App Store — Free with optional $9.99 Pro upgrade.

Android

Coming soon. The codebase is cross-platform (React Native / Expo), and Android builds are functional — we're focusing on iOS polish first, with Android launching once the feature set matures. Watch this repo or check back for updates.

Build from Source

git clone https://github.com/RedGridTactical/RedGridMGRS.git
cd RedGridMGRS
npm install
npx expo start

Standard features work from source. Pro features require a valid purchase through Apple or Google.

Privacy

Data Collected Stored Transmitted
GPS location In memory only Never Never
Waypoints (Standard) In memory, cleared on exit Never Never
Waypoint lists (Pro) On device only Local only Never
Settings (pace/declination/theme) On device only Local only Never
Device identifiers Never Never Never

No ad networks. No analytics. No crash reporting. No third-party SDKs. In-app purchases are processed by Apple — Red Grid MGRS never sees your payment details.

Full policy: Privacy Policy | PRIVACY.md

Built For

Military personnel, search and rescue teams, law enforcement, wildland firefighters, first responders, hunters, and backcountry navigators who depend on accurate grid coordinates in austere environments. Whether you trained on a DAGR or a lensatic compass, Red Grid MGRS speaks your language.

Roadmap

iOS-first. We're shipping and polishing on iOS first. Android is cross-platform ready and will launch once the iOS feature set matures.

v2.1 — Polish ✅ (Shipped March 2026)

  • OLED true black display mode ✅
  • Typography refinement (SF Pro) ✅
  • Refreshed app icon ✅
  • ProGate upsell modal ✅
  • 6-tab bottom navigation ✅
  • Coordinate format selector (UTM/DD/DMS) ✅
  • Wayfinder arrow compass heading ✅

v2.5 — Pro Features ✅ (March 2026)

  • HUD mode — full-screen tactical display ✅
  • Photo geostamp (MGRS/DTG burned into image) ✅
  • Haptic grid crossing alerts (1km / 100m boundaries) ✅
  • Shake-to-speak voice readout ✅

v3.0 — Tactical (Fall/Winter 2026)

  • MGRS grid overlay map (MapKit)
  • Mission planning (waypoints on map, route plotting)
  • Photo geostamp map inset (topo layer via MapKit snapshot)
  • GPX/KML import and export
  • External GPS support (Garmin GLO, Bad Elf via BLE)

v3.5+ — Platform Ecosystem (2027)

  • iOS: Live Activity + Dynamic Island, Apple Watch companion, Siri Shortcuts, Widgets
  • Android launch — full Play Store release with all features from iOS track

Support

License

MIT + Commons Clause — free for personal non-commercial use. Commercial use requires written permission.

Your phone. DAGR capability. No frills. No tracking. Open source.