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    Re: Latitude and Longitude by "Noon Sun"
    From: Lu Abel
    Date: 2005 Jun 5, 21:08 -0700

    Charles Seitz wrote:
    
    > May I suggest a noon sight fix might suffice for verification
    > of the dead reckoning position required for a direction/intercept
    > fix?  Might that fix actually be superior to a DR position that
    > hasn't been updated during a period of prolonged cloud cover?
    
    If I were running an "aged" DR, I think an LOP perpendicular to the DR
    track would be the most useful way of getting a better estimated
    position.  So a noon sight would be most useful on a north-south course.
      If I were running more E-W, I'd personally prefer a LOP sight from a
    body (sun? moon?) directly ahead or astern.   In fact, this latter can
    be generalized to any direction -- the best EP will likely be given by
    an LOP perpendicular to the course and therefore from a body ahead or
    astern.
    
    Before the really smart people on this list jump on me -- I'll amend the
    opening statement to wishing for an LOP perpendicular to my expected
    direction of motion (ie, if I thought I might be being set by a current
    I'd wish for an LOP that was perpendicular to the expected COG).  Even
    more important, I might wish for a sight that gave me a LOP between me
    and a dangerous area (shoals, coral atoll, ...) so I'd know how close to
    it I was.
    
    Lu Abel
    
    
    

       
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