How often do compasses go bad after crash?

[lawman0210]

Before I scrap this P2V Plus is there a change my drifting issue with another P2 is that? Should I swap it?

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[RoyVa]

Most drifting is due to IMU calibration. You may want to check that first. Quad must be perfectly level front to back and side to side when calibrating to get it stable.

 

[lawman0210]

It says Imu does not need to be calibrated. Reading your reply I see that calibrations aren't to be taken lightly

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[RoyVa]

The IMU needs to be recalibrated after a crash or if the quad had been rough handled like in shipping or has gotten bounced around. When in doubt and if your drifting, what have you got to loose. Calibrate!!! Then when you go outside calibrate the compass. See if that corrects your drifting issue.