Anyone know why you have to calibrate the compass on the Kestrel but not on the compatible range finders? I too have had issues with DOF readings on my 5700 and had to re-calibrate the compass. In utilizing the range finder and having it send Range, angle and direction of fire to the Kestrel, there is no calibration required for the range finder. Is there a different way it is getting the compass heading and if so, why doesn’t the Kestrel use the same.