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    Re: Dip uncertainty
    From: Alexandre Eremenko
    Date: 2004 Dec 5, 19:25 -0500

    This is strange and seems to contradict another rule
    that "dip due to refraction is about 1/12 of the
    geometric dip". Maybe the sort of uncertainty you
    are talking about is due to the waves?
    It seems that under the ideal conditions (no waves)
    the dip and the error in the dip should be smaller
    as you come closer to water.
    
    The Russian manual I read long ago, which worries a lot
    about dip, recommends observations from LOWER positions
    on a large ship.
    
    Alex.
    
    On Sun, 5 Dec 2004, Bruce Stark wrote:
    
    > One aspect of the uncertainty of dip that I don't think has been discussed on
    > the List is that it gets worse fast as your eye gets nearer the water. That
    > is, it's much more a problem for small boat navigators than for ship's
    > officers.
    >
    > Bruce
    >
    
    
    

       
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