I'm having a very annoying issue with an APM 2.5 board. I can't manage to do a proper compass calibration. After getting samples for 60 seconds I get the offsets, and the first one is always way out of range.
I get around -215, -60, -100 every time. It varies a little bit, +-10 or so, but that's just about it. I didn't even manage to get something over -200, not even -199.
My first try was inside a laboratory with lots of equipment, so got outside. Still the same. Went to the street. Same results. Took the APM back home and tried it there. Same thing. I just went to my yard to try it out, with the same luck.
What might be the issue? Any ideas?