A brief update with the newly released 4.1.0-Beta1 build installed. Previously I was using a magnetometer fallback along with GPS yaw, which is not what I intended, but the development build that I was using had a bug that caused constant nuisance warnings about bad compass health if all compasses were disabled/unused. Not anymore!!!
For more information, join the discussion in the ArduPilot community forums:
https://discuss.ardupilot.org/c/ardurover/rover-41/
source