today I ran through the compassMot and just was a little stunned at my 60% precent result. I made up a little board to go under the apm with 2 layers of foil in it thinking that would give me some shielding but I was only able to get 50%. I made sure the hexcopter could not move at all. my apm 2.5 sits 25mm above a PD board and perhaps 50mm diagonally away from the esc's. I mean it flys well and hovers nicely, but a little improvement is always good. any suggestions would be hugely appreciated!