I have a compass which has triangle and circle cut outs in it. What are these for?
Similar to this compass: http://media.rei.com/media/kk/202bb4b6-3f47-4dd4-80a1-ed327bd37e1b.jpg This is my compass: http://i.stpost.com/erez4/erez?src=ProductImages/88876%5F99.tif&tmp=FullSize&redirect=0 The big circle is the magnifying glass. But the other circle and triangle are the cut outs.