Geebax
Captain
Australia
Online
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There are two main possibilities, you have not performed a good compass calibration, or there is a problem with the compass module.
So far, you have not answered the question about compass calibration. The most common cause of compass problems is because the calibration was done badly to begin with. It needs to be done in an area well away from any steel or iron, preferably in a grass field, never on concrete. You must also make sure you have no metal objects on you during the calibration.
Once you get a good calibration, it is important not to take off from a place where there is any steel or iron, again, keep away from concrete, do not take off from a wooden bench in a park for example, as they sometimes have steel frames. Not from on top of a car either.
Also, a compass error has nothing to do with the IMU, so you do not need to keep doing an IMU calibration.
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