NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2014 Mar 29, 00:42 -0400
Thanks for the clarification Randall. That is indeed what I suspected.
Your findings about difficulties at large angles is spot on. I have tried many times to perform a back sight of Polaris from my south facing ocean beach to no avail. The instrument is preset, I can see Polaris when I look directly at it, and yet, it eludes me.
Brad
The 100 degrees is the AH DOUBLED angle. At higher altitudes the arc of the sexant rock is more pronounced. It is more difficult to get accurate sights above 100 degrees.
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