My compass decreases its reading as much as 90 degress with take-off motor power (high current). It does this both on an APM 2.5 and an APM1 board. I've moved the APM board to the secnd deck in the stack and the deviation is only 10 degress, but stll present. I've been testing with nothing connected to the APM but a RX to try to isolate the problem.
I have a stock 3DR-A frame with 880kv motos and a Attoilot 90A current sensor. Stock 3DR power distribution board.
Obviously this is an issue with just my set up. Could it be a bad power distribution board? Current draw seems to be as expected (~28A in hover). Can the placement of the Auttopilot current sensor cause a mag field that can affect the APM's magnetometer?
Has anybody seen this issue before?