Using Pixhawk and calibrating compass with mission planner, 

I have this offset for compass all the time (nearly the same)

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when simulating the error called "PreArm: Compass offset too high"

the question is why this happens?

I found a lot of question nearly the same, but the whole solutions didn't work for me.

3 Questions 

1) want to know the unit of the compass offset?????

(what a guess is a 'vector length for x,y,z' that wasn't enough)

2) and why is the second offset always under -500????

(e.g second value -558, -517, -532) 

3) whats the difference from QGroundControl??

(QGroundControl was absolutely normal. and found that the unit was quite different.)

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