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    Dip Short
    From: OH Jacobson
    Date: 1997 Sep 24, 8:06 PM

    Glenn Geers,
    
    You are referring to Dip Short - short of what would be the sea horizon
    because of intervening land causing the sea-land interface to be up
    against the far shore.
    
    The 1995 Bowditch (p. 340) gives the following equation for Dip Short:
    
    Ds = 60 arctan((hf/(6076.1 ds)) + ds/8268), arc min
    
    hf = height of eye of the observer above sea level in ft
    
    ds = distance to the waterline of the object in nm
    
    
    Ollie Jacobson
    ba238{at}lafn.org
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