Charles Adams
lvl.4
Flight distance : 3821312 ft
United States
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I'm not sure what you mean by "free space". Yes you want to calibrate the compass in an open area, free of any possible magnetic disturbances. The spark is pretty sensitive (really sensitive), so if it's convenient I'd find a fairly wide open field with no man made structures and no power lines nearby. I'm not talking "acres and acres", but I am suggestion you "get out of the house".
IMU Calibration is also sensitive, in that you want to perform this calibration on a surface you have already determined is flat and level.
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