Hi guys, I need your help. I’m calibrating my holybro M8 nano compass on MatekH743 V-3 slim board and the compass is not calibrating. The calibration is restarting again. My setup has 3 lidars. The GPS is enclosed in a 3d printed shell similar to DJI mavic(but 2x the size).
I tried calibrating it on QGCS but it always shows in red zone.
(PS: I’m calibrating the drone in a closed room/lab).
Please help me with the issue 
How far away from other electronic components and especially power cables is your receiver positioned?
I lately had a similar problem with a Radiolink M10N receiver. Finally it helped rotating the module for 180° for successful calibration.
the GPS is little far from the electronics on the top shell and apart from that I have shielded it using copper tape to cancel out any interference.
But yeah I have positioned it in -180 deg…
will try to reposition it 
Copper tape does not shield from magnetic interference and is therefore useless.
Try to get some distance to other components in case rotating the module doesn’t help.
Your gps should be about 8-10cm from other electronics. That is what i found out optimal.