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I have been trying to calibrate the compass on my BerryGPS-IMU v3 using the code and tutorial in compass_tutorial03_calibration but I am getting an offset of about 30 degrees even after calibration. I know that the declination in the area is 11 degrees 20 seconds east but that does not explain the offset I'm seeing. I can put a compass next to the board and line it up to a 0 degree heading but the heading I get from the compass is always around 30 degrees off. Is there something wrong with the compass or is there something wrong with the code?
Did you calibrate the IMU when it was in its final location?
Try graphing out your calibration to see if you get a sphere, as shown here
Mark --OzzMaker.com --
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