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Red Grid MGRS

Launching today

$3.99 app replacing the military's $2,500 DAGR GPS

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$3.99 app replacing the military's $2,500 DAGR GPS

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The military's DAGR (AN/PSN-13) costs $2,500 and runs a UI from 2003. Red Grid MGRS puts the same land nav in your pocket — live 10-digit MGRS, dead reckoning, resection, pace count, declination, waypoints, 6 radio report templates, and NATO voice readout. Built with React Native, fully offline, zero tracking. The algorithms are all public domain — one dev built this in months. Open source on GitHub.

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Hey everyone! I built Red Grid MGRS because the military's standard GPS navigator — the DAGR (AN/PSN-13) — costs $2,500, weighs a pound, and runs on a UI from 2003. Every soldier who's used one knows the frustration. What surprised me most is how little effort this took. The MGRS coordinate math, geodetic calculations, bearing/distance formulas — it's all public domain algorithms that have been around for decades. One developer, React Native, a few months of work. The bigger point: the military is full of overpriced, outdated hardware doing things a modern phone handles better. Not just GPS — radios, planning tools, logistics trackers. I'm hoping this project shows that genuine innovation is possible here, because the people who depend on these tools deserve better. Features: live 10-digit MGRS, 8 tactical tools (dead reckoning, resection, pace count, declination), 6 radio report templates, waypoint lists with a wayfinder arrow, NATO voice readout, NVG-green theme. Fully offline, zero tracking. $3.99 on the App Store, optional $9.99 Pro upgrade. Open source on GitHub. Happy to answer any questions about the nav math or the build!

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23h ago

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23h ago

I built an app to replace the DAGR — $3.99 instead of $2,500

Every soldier who's touched a DAGR (AN/PSN-13) knows the pain $2,500, weighs a pound, UI from 2003, and half the time you're fighting the device instead of navigating. I built Red Grid MGRS to put the same core land nav capabilities into a phone app.

What it does:

Live 10-digit MGRS grid
Dead reckoning, two-point resection, pace count, back azimuth
Magnetic declination (auto or manual)
Waypoint lists with bearing/distance and a wayfinder arrow
6 radio report templates (SALUTE, 9-Line MEDEVAC, SPOT, CASEVAC, ICS 201, CFF)
NATO phonetic voice readout
NVG-compatible green theme

Fully offline zero tracking, zero network calls, zero data collection. $3.99 on the App Store, $9.99 optional Pro unlock. Open source on GitHub.

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What it does:

Live 10-digit MGRS grid
Dead reckoning, two-point resection, pace count, back azimuth
Magnetic declination (auto or manual)
Waypoint lists with bearing/distance and a wayfinder arrow
6 radio report templates (SALUTE, 9-Line MEDEVAC, SPOT, CASEVAC, ICS 201, CFF)
NATO phonetic voice readout
NVG-compatible green theme

Fully offline zero tracking, zero network calls, zero data collection. $3.99 on the App Store, $9.99 optional Pro unlock. Open source on GitHub.