Just saw this ikopta video (scrub to about 6:15,) and since I have two of their magnetic cases in my M2P backpack less than about three inches away from the Mavic, I'm wondering what the odds are that it will ask for a compass cal the next time I fire it up? (Too bushed at the moment to test.) I guess this is for those folks on here who really know their stuff about on this subject. I have no way to measure their strengths or fields but they're fairly stout for their size. Easy enough to drill out and fall back to Velcro or the old rubber band. 
Contributions, welcome.

Contributions, welcome.