A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed Popko
Date: 2019 Mar 24, 02:48 -0700
Perhaps this paper is one of your references. I have not re-read it since writing it. I think Gary found an error when originally posted but I can not find that post.
I have Googled your CPU50A/P device but have not found anything. You have quite a unique star finder/calculator.