Race tracker for remote locations using LoRa and Raspberry Pi

Bike/Running Race tracking software for remote locations (with no mobile/internet coverage).

Competitor unit:
GPS board
LoRa modem
Power (battery - possibly passthrough from competitor's bike light.
Ant.
Panic button
Enclosure for mounting on bike (waterproof, saddlebag?)

Demo unit uses Adafruit Feather M0 LoRa and GPS featherwing.
Device is given a DeviceID, from this is derived a transmit slot (TDMA) using GPS PPS for synchronisation.
Position, battery level, panic button status are transmitted periodically to receiver/base station

Base Station Unit
Designed to be 12v powered inside e.g. motorhome or support vehicle.
Raspberry Pi 3 set up as wifi hotspot and captive portal.
LoRa radio receives position reports from competitor units.
Traccar or OpenGTS open-source GPS tracker server.
OpenStreetmap tiles are served from offline cache to connected clients.
Spectators can view progress on smartphone/tablet by connecting to wifi hotspot.