A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robin Stuart
Date: 2016 Jan 19, 11:11 -0800
Thanks for posting this link. It's interesting to see how little things have changed.
After spending lot of time on a wild goose chase messing with determinants trying to reconstruct the great circle diagram as a nomogram I reaslized it's quite a bit simpler than that. I am now able to replicate the scales of the diagram and attach the explanation here.