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    Re: Advancing LOPs for precision fixes
    From: Gary LaPook
    Date: 2010 Feb 18, 02:41 -0800

    Have you tried using the method in the N.A. to which you refer? I may be
    missing something but I don't see anywhere in the given formulas where
    you input course and speed which would be necessary if the method was
    allowing for advancing the LOPs to a common time.
    
    gl
    
    
    P H wrote:
    > As John Karl writes in his book:
    > "The Nautical Almanac gives an iterative procedure for calculating a
    > fix from several intercepts and azimuths determined from their St.
    > Hilaire sight reductions."
    >
    > I would add that this procedure does take the vessel motion (assumed
    > to be constant during the round of observations) into account.  I am
    > confident that I am simply restating a fact that is well-known among
    > NavList members.  Also, I think it is not unreasonable to assume that
    > the content of the Nautical Almanac reflects common (standard,
    > recommended, accepted, etc.) practice.
    >
    >
    > Peter Hakel
    >
    >
    > ------------------------------------------------------------------------
    > *From:* hch 
    > *To:* NavList@fer3.com
    > *Sent:* Tue, February 16, 2010 8:20:41 AM
    > *Subject:* [NavList] Re: Advancing LOPs for precision fixes
    >
    > Gary,
    >
    > You said ... "It is common practice to ignore the movement of the ship
    > during the time period needed to take a round of sights ...", and I
    > am unable to dispute this assertion in the light of today's "it's good
    > enough" approach to Celestial Navigation. I can, however, state in no
    > uncertain terms that this was not the traditional approach - LOPs
    > generated in a round of sights were always advanced or retarted to a
    > common time, so long as the distance run between individual sights was
    > measurable, if for no other reason than professional pride.
    >
    > Regards,
    >
    > Henry
    >
    >
    
    
    
    
    

       
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