Not so sure about making a blanket statement on this. I have a cheap Silva ($14.00 originally) that I would not classify as reliable. A compass being out a few degrees over a fair distance can make a difference in finding your destination whether it be your camp or your vehicle. Sure you end up in the general area you need to be but when light is fading fast or bad weather is hitting you, I prefer to have a compass that gets me closer to where I was originally headed for.
How does any compass manage to be "off" by a few degrees. It points to the north pole (or rather along the lines of magnetic force). That is the same for all compasses.
Granted some are easier to take precise measurements with. Perhaps that's what you meant. But that is often related to operator proficiency.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.
Bob
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