什么是 Red Grid MGRS？
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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