The purpose of function getNorthAz is to make the cordwrap work even if the mount is powered up when the scope is not pointing at North. Since the CPC mount zeros the motor encoders at power up,
getNorthAz compute the offset between North and scope direction at power up. This offset is subtracted in cordwrap angular computations. If the mount is not aligned, getNorthAz returns zero, otherwise it returns the real North azimuth.
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