GPS
The GPS app shows the current fix from an ATGM336H module wired to header J6. The module is optional, and GPS is off until you enable it in Settings.
Wiring
Section titled “Wiring”Connect the module’s TX to ESP RX (IO12) and its RX to ESP TX (IO11), with VCC to 3V3 and
GND to GND. Then set gps_enabled in Settings. The RX and TX pins are configurable there if
your wiring differs.
What it shows
Section titled “What it shows”When the receiver has a fix, the app shows latitude, longitude, altitude, and the satellite count. Before a fix it shows “Searching”.
The firmware parses RMC and GGA sentences. When the RMC sentence carries a valid time, the system clock is set from it, which the badge uses for message timestamps and for naming track files.