When you pull out the compass, you generally need a more precise determination. On one occasion, I needed to differentiate between 40 and 20 degrees, something a bit tricky with a tiny little button thingy....
yes indeed. don't get me wrong, I am not advocating a button compass as a primary compass, just a back up, when for some reason your primary gear and compass have been compromised [insert your favorite survival scenario here] and a general sense of direction is all you need (the river runs north to south, and I am east of the river, so if i travel in a westerly direction I will eventually run into it).
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