WOW!!! When I first saw this I was looking for several different tools, not an all in one.  This Compass fulfilled all my requirements and I didn't even realize that it would when I bought it.  I work on Satellite communications systems and aligning antennae is part of my daily taskings.  This compass has a movable bezil ring which makes finding a bearing incredibly simple.  It works well in the northern hemisphere.  I have not had the opertunity to use it in the southern as of yet.  The Clinometer makes it quite simple to get elevation angles nearly perfect. I have also done some hiking with it and I have not become lost as of yet.  The literature that comes with the compass is easy to understand.