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    Re: Cannot dispense with the assumed position at sea
    From: Jim Thompson
    Date: 2004 Feb 19, 22:36 -0400

    Everybody has different semantics, is all; I think that we are all saying
    the same thing functionally.
    
    Our CN course uses "AP" to mean the entering argument for calculating Hc,
    similar to Henning Umland's "IP" (initial position).  That AP (IP) can be:
    
    - A DR or any other similarly precise position, if the sight reduction
    tables or formulae  that we are using accept fractions of lat and long.
    - A nearby rounded lat/long position, if the sight reduction method cannot
    accept fractional positions.
    
    Our course discourages using an EP as an initial position, although I
    understand that is debatable.
    
    The degree of confidence that the navigator has in an EP plotted on a
    celestial LOP is directly proportional to the degree of confidence he or she
    has in the initial position used to plot the LOP in the first place.  See
    http://jimthompson.net/boating/CelestialNav/CelestNotes/SightReduction.htm#D
    eadReckoning
    and
    http://jimthompson.net/boating/CelestialNav/CelestNotes/Plotting.htm
    and
    http://jimthompson.net/boating/CelestialNav/CelestNotes/Definitions.htm
    for the conventions that we are using.
    
    Jim Thompson
    jim2{at}jimthompson.net
    www.jimthompson.net
    Outgoing mail scanned by Norton Antivirus
    -----------------------------------------
    
    
    

       
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