NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2025 Dec 4, 09:30 -0800
In the attached plot, where is your fix, and how do you know?
You should assume that the three star lines here represent sights taken in rapid succession (so no vessel motion to worry about) in evening twilight. You should also assume that there is no "systematic" error --that is, no missing index correction or similar fixed offset in each sight. To describe your estimate of the fix, based on the image, determine its offset above the horizontal axis in minutes of latitude and its offset to the right of the vertical axis in minutes of longitude (don't worry about longitude scaling). You could also use the decimal degree scales for the offsets.
Sight intercept data before plotting:
STAR A: 1.5 n.m., "towards" 149°
STAR B: 22 n.m. , "towards" 58°
STAR C: 23 n.m. , "towards" 40°
NOTE: If you figure it out with an app or with code, explain which app or describe your code. If you select your location, based on "instinct" or your general "familiarity", then describe your thinking, your "reasoning". There is a method, which I will describe in a follow-up, that solves this one exactly...
Frank Reed
Clockwork Mapping / ReedNavigation.com
Conanicut Island USA
