magnetic interferance

Yesterday I was going to do some recreational flying M2Pro in an area where I've flown 5 or 6 times before. There are some high intensity power lines a few hundred feet from where I was launching. Two unusual things happened, I believe unrelated to each other. B4U Fly gave me a message to...

I'm assuming there is spring steel in my landing pad? That's 360 degrees of a magnetic ring around my Mavic Pro? Any opinions on this?:oops:

I'm trying to get a shot in a magnetic hotspot - an abandoned building made up of steel and concrete with two large 13 story voids as its central features. These voids rise from the mezzanine up towards an open skylight. The idea for my shoot is to fly up the 13 floors looking down and then...