Show HN: Red Grid Link – peer-to-peer team tracking over Bluetooth, no servers

Red Grid Link is a peer-to-peer team tracking app that uses Bluetooth and WiFi Direct for zero-config proximity sync, requiring no servers or cell service. It provides MGRS navigation with 1-meter GPS precision, offline maps, and AES-256-GCM encrypted position sharing for small teams of 2-8 people. The app supports multiple mission profiles including Search & Rescue, Backcountry, Hunting, and Training, with extensive tactical tools and battery-efficient expedition modes.