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From: Jim Thompson (no email)
Date: Fri Oct 08 2004 - 22:24:30 EDT
> 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
www.jimthompson.net
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