Added support for fixed yaw mag calibration #12863
Merged
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This is a fast compass calibration given vehicle position and yaw. The calibrations results in zero diagonal and off-diagonal elements, so is only suitable for vehicles where the field is close to spherical. It is useful for large vehicles where moving the vehicle to calibrate it is difficult.
The offsets of the selected compasses are set to values to bring them into consistency with the WMM tables at the given latitude and longitude. If compass_mask is zero then all enabled compasses are calibrated.
This assumes that the compass is correctly scaled in milliGauss
MAVProxy implements this using the "magcal yaw" command.
This PR depends on this:
ArduPilot/mavlink#113