PreArm: Check mag field (xy diff:1xx>100) doesn't go away

[Yuri_Rage]

Try using the magfit tool.

While you claim there is little interference, your real world results suggest perhaps another story.

New MAGFit compass calibration WebTool

Many of you may be familiar with MAVExplorer’s MAGFit functionality that allows compass calibrations to be performed from flight logs. Our new tool brings the same functionality to our WebTools suite. For best results use a flight log that covers as many orientations as possible. Flying figure of eight patterns works well. If you need a motor calibration using either throttle or a current reading then you should also try to cover as wide a range of throttles and current draws as possible. You d…