A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Örjan Sandström
Date: 2016 Dec 10, 02:16 -0800
Greg, fairly accurate description of my standpoint.
I have found that accuracy seems to drop off with some correlation to level in the bottle.
Would be an interesting getting data enough to get actual numbers, for some reason I doubt anything of real use though.