NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Averaging
From: Jim Thompson
Date: 2004 Oct 8, 23:24 -0300
From: Jim Thompson
Date: 2004 Oct 8, 23:24 -0300
> From: Navigation Mailing List Behalf Of Bill > I would ask Alex et al if using an average of sights over a short > time, (say > 4 minute span for this discussion) from a moving vessel, what > will he use as > DR/EP/LHA/AP when reducing his sight(s)? I hope this is relevant to your question: Average sight time = the arithmetical average time of the round of sights. Average altitude = the arithmetical average altitude of the round of sights. The DR position would be that point on the DR plot where the vessel is thought to be at the average sight time, based on the vessel's course and speed. An AP can be any convenient nearby position that fits the decimal precision of the sight reduction method used. The LHA would be the one determined for the average sight time. The EP would be that point on the LOP of the average sight time and average altitude where a perpendicular from the LOP intersects the DR position. Jim Thompson jim2@jimthompson.net www.jimthompson.net Outgoing mail scanned by Norton Antivirus -----------------------------------------
