Quote:
Originally Posted by Flint Ridge
Are compasses impacted by metal buildings and various RF type signals?
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Yes to metal. In a big way. I use a sailboat compass I have laying around, and I have to be careful to stay away from the mast and other ferrous metal items. But if I can get it within a few degrees, I consider it good, and fine tune from there. If there is a lot of metal around, it's probably better to eyeball a landmark (in line with the mast) from the ground, away from everything, and aim for that when on the roof.
And cel phone compasses seem to give a different reading every time I try, so I don't bother with that, other than maybe seeing which way is what in a very crude sense.