phat

I took my GPS outside with compass set to True and walked due north and then held a magnet up to it and then turned the magnet and there was no change in the readout. I then set the GPS compass to mag and walked the same path and held the magnet up to it and there was no change. The Garmin Foretrex101 cannot sense magnetic flux, however when I set it to Mag it read 17, so I guess the "usr" setting would allow me to enter a magnetic deviation. 17 degrees is no longer accurate here. So why do you have to rotate the GPS to calibrate the compass?
Jim


Edited by Jimshaw (02/03/10 03:21 PM)
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.