for my mariner's compass quilts i use the pre-printed interfacing patterns from QuiltSmart. they do have a couple different ones to choose from. I've been using their interfacings patterns for --gosh about 8 years for lonestars & mariner's compasses, along with their game quilt which i've made about a dozen of. they are great- make everything come out perfectly with no fabric waste...the first quilt i made for our bed was a large mariners compass - it is a pretty spectacular quilt.