NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: fix from repeated observation: was Re: Coriolis vs Noon curve correction
From: Jeremy C
Date: 2009 Apr 26, 15:21 -0700
From: Jeremy C
Date: 2009 Apr 26, 15:21 -0700
To be clear, the lines I am currently talking about (not the Moon line from last year) are lines of a single body (Sun and Venus) on either side of upper transit, shot over about an hour of time in January. I did cluster more observations around the calculated time of LAN. I shot many lines, but could only use 25 in the program so I started taking every other one or so. I am away from my navigation notebook right now, but will attach a short PDF of the data in about a week when I return home. As far as accuracy of lines in 10 minutes or so (I can shoot about 20 lines in this time) at various times away from upper transit; I will have to experiment with this upcoming trip. I don't have any unreported data of this kind. As far as how the program works I am not certain as I am far from a computer expert. I can feed it an artificial DR but as a matter of course the ship doesn't DR more than an hour or so, and with ECDIS usually we are withing 0.25 nm on either side of track, but I can tweek the numbers and see what the program does. Jeremy --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
