Yaw error over high voltage pylon

[RoboMotic (AMV)]

Check this out

Landing Inside a Giant Truck, Compass Problem

According to the list, no. Loiter mode requires GPS lock. https://ardupilot.org/copter/docs/flight-modes.html#gps-dependency Edit: I think I may have misread compass as GPS. System won’t let you arm if there is no compasses. But you may have a look at this compassless operation. https://ardupilot.org/copter/docs/common-compassless.html#gsf I have not try this new feature but seems like it is acceptable. It uses IMU and GPS to estimate the yaw.

I make the GPS compass works and works great

hope will work for you