PROBLEM! continual compass drift with APM2.5 board - HOW to diagnose/correct??

Greetings esteemed UAV-ers...

I'm running an APM2.5 board in a ParkZone Radian (3 controls - throttle/rudder/elevator).

My initial manual flights were successful, including running in Stabilize and Loiter Modes (using my Spektrum DX7s 3-position flap t

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