I have endless respect for your knowledge on this subject. I always see that you are the biggest supporter on this kind of topics in the forum.
But I can't help but ask. There are Virtual Anchors (e.g. Minn Kota, Haswing) used on boats. Also, the vast majority of RC Autopilot systems (except Ardupilot) only rotate on their own axis, calibrate the magnetometer and reach their destination without any problems.
What do you think is the process in these, I wonder what you think about this?