Severe compass drift

@PickyBiker wrote:

I am using pixhawk 2.4.6 arducopter 3.5.3 and mission planner 1.3.50.
In the initial setup and the mandatory setup I am having severe compass drift and misalignment. initially the compass is off by 80-90 degrees positive and then gradually drifts constantly about 5-6 degrees per minute in the negative or counter clockwise direction. I have a second pixhawk behaving similarly. Neither one will successfully complete compass calibration even with relaxed mode. The current offsets are x: 27, y:17, z:-815

Both of these have been in minor crashes but they just didn't seem severe enough to damage anything unless the compass in the pixhawk is very delicate.

There is no flight log because I don't want to fly without a compass. The GPS is not connected, so it is definitely the internal pixhawk compass showing the problem. .

Thoughts?

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