A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Randall Morrow
Date: 2017 Jan 28, 19:53 -0800
For an artificial horizon I use a first surface mirror on a round metal plate. It is adjusted on 3 screws with 40 TPI. Using 2 spirit levels I routinely get less than a mile accuracy in any wind. Ahmundson used this in his polar explorations. Instructions for making the levels are posted in the archive.