A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2019 Feb 20, 15:38 -0800
Your answer requires that you define what is an acceptable error is. Any measurement of the LD will suffice, provided you are willing to accept the result as bounded by some error term. The error term is related to the accuracy of your instrument and the skill of the observer.