A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2020 Apr 27, 14:08 -0700
Sven Yrvind is seen in this YouTube video using his Bris. At minute 04:07 you will see him showing the Bris attached to glasses.
Looking through a sight tube on a sextant with the eyeglass mounted Bris will get you calibration angles within 10' moa. For high precision it will be necessary to use the natural horizon. What I do is mount the Bris to a DSLR camera for added consistency. It is possile to sandwitch and weatherproof a Bris between two UV camera filters as seen in attached images.