Recently I came across a site that was of interest to me in that I just love Compasses...always have. Perhaps this thread can evolve into a "Compass users guide" and or article. I have many sites book marked with how to videos...but for now...lets start here.
The Compass museum
http://www.compassmuseum.com/diverstext/history.htm
The Compass museum
http://www.compassmuseum.com/diverstext/history.htm