Mumetal --- magnetic interference --- compass calibration

While reviewing below arducopter wikis, I have a question to community:

will using mumetal (magentic shielding) make the copter more compact and compass safe?. will this help in reducing the distance between APM/PixHawk and the battery. Also, can external GPS mast be avoided by using mumetal?.


Well… I use this Mumetal plus a GPS mast with good results. Haven’t tried to safe the mast yet