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Question: North

Two questions about the NORTH function. First, is it pointing to true north or magnetic north? In my area there is about a 14 degree difference, and it would help to know. Second, I probably did not pick the most open spot to initiate the north function, and as a result it does not point well to either. I would like a second chance to RE-initiate the north but so far I have not had any success. I tried it by removing the batteries for a short time but that did not work...Any ideas are welcome.