Flying at home in western Canada, I get them once in a while, but mostly flying in the mountains. I've been in Greenland for 2 weeks and get them all the time (i.e. Every few seconds depending on where I am). Did a compass calibration before my first flight here and it was crappy. Did a couple more in different places and things got better. Last one was done on a sand beach and it's been okay. Still get the errors, but not too bad. I think flying over areas with high iron content can cause problems (volcanic rock, etc). I've been flying off of a boat in the ocean out around big icebergs for a few days and have gotten the errors a bunch but I just ignore them now.
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I really don't know this
but could it be that you are so far north that it is not as accurate or even work well at all
iron rock etc I am sure could do funny things and add to the proximity to mag north pole...