RANKAN turns your phone into a professional off-grid communication system. Built by a firefighter to solve real-world "dark zone" gaps, it uses mesh networking to keep your group connected without cell towers, Wi-Fi, or internet. • Adventure Mode: PTT radio, live group mapping, and one-tap SOS. • Professional Mode: Full ICS logging, PAR reports, and sector drawing for SAR teams. No accounts, no ads, and 100% free. Just direct device-to-device safety when the grid fails.