If you're wanting to draft a mariner's compass there are many free patterns and blogs around to help you. I took this course in 1999 and this is the first time I've looked at the block or drafting since
so I'm sorry I can't give you much more info on it. Try this ...just scroll down a little & there's a good description of one here.
http://debbykratovilquilts.blogspot....-mariners.html