I cannot get the GPS to work on UART3, Mission Planner shows “No GPS”.
The hardware setup is fine since Betaflight was showing a solid GPS fix before I flashed the board with Ardupilot 3.9.0.
I have the following parameters in Mission Planner:
SERIAL3_BAUD=9(9600) - I tried all values here.
The GPS module is a BN-220 (M8N UBLOX).
I disabled all Compasses since UART3 is shared with I2C, and I thought that leaving external compasses enabled could create conflicts with the GPS in UART3.