Feature
A LoRa primary link makes offline safety coordination more trustworthy
YuanShan is explicit about roles: the phone handles UI, maps, sensor fusion, and alert interaction, while the external Sub-GHz radio handles long-range position and alert transport under shielding and difficult terrain.
Why not phone-only mode
Phone-only proximity links are useful for discovery and fallback, but not as the primary safety path in mountain terrain. A real safety workflow distinguishes Full, Limited, Near-only, and Last-known states.
Key capabilities
- Location heartbeat, route deviation alerts, no-motion alerts, and manual SOS.
- ACK, retransmission, and expiration control for critical messages.
- Battery, link quality, and device state logging.