A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2020 Jun 10, 13:30 -0700
"When I use the anti-spoof app I am very happy if the error is <1'."
David, If you are using an artificial horizon and making observations with a metal sextant equipped with an optic then sub 1 minute of arc on an intercept should be the norm unless the wind is really blowing.