How precise must the compass be aligned?

I am using an external M8N-GPS receiver with integrated compass. Now, I was wondering how exact we have to align the compass to the front direction of the Pixhawk. Obviously, exact alignment is ideal and the goal, but what about an offset of 1 or two degrees? Is there any way or routine that Arcupilot recognizes small offsets and corrects them?

I never read anything about this topic and maybe someone knows more about this.

On the 23 drones that I did equipped with M8N and integrated compass, I am certain that some were more than 1 or two degrees out :slightly_smiling_face: Never had more than eye bowling kind of alignment. If you setup waypoint with a tolerance of 1 metre and slow down enough to reach precisely the waypoints it simply work like a charm!

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