To Nocken: Mag north is far more confusing than a fixed number like 10* west. Have a look at a map of the deviation lines for the entire planet for a given month/year and if that doesn't confuse you then I don't know what will.
As for the inaccuracies in bearing, yeah greater time intervals as suggested by Pisces would get me a long way but unfortunately it seems that is a luxury I can't always afford. Sometimes I need to get it all solved in less than 20 minutes leaving only a few minutes between readings.
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