A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2016 Jul 30, 17:04 -0700
To be honest, I consider this "Practice Bubble" a mere toy. It doesn't train a navigator much in the use of the sextant, and the level of potential accuracy is very low, probably too low for any meaningful experimentation. You don't have to worry about that 15' Moon correction because the practice bubble really isn't capable even of that basic level of accuracy.
For backyard practice, try lunars. Or if you have some mechanical skill, build a nice leveled front-surface mirror to serve as an "artificial horizon".
Clockwork Mapping / ReedNavigation.com
Conanicut Island USA