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    Re: AP terminology, WAS: 2-Body Fix -- take three
    From: Hewitt Schlereth
    Date: 2009 Nov 12, 11:13 -0400

    Hey, guys, the Nautical Almanac Sight Reduction Table requires LHA and
    Lat to be in whole degrees. Just to add to the fun, it calls the
    initial-entry Lat and LHA 'estimated'.  :-)  -Hewitt
    On 11/12/09, John Karl  wrote:
    >  No, Peter, I am not.
    >  The term AP is the location used to solve the navigation triangle in
    >  the St. Hilaire method.  This location might be the DR, it might be an
    >  EP (estimated position), it might be a recent fix of any kind, it
    >  might be a GPS position (used to check the GPS, of course).  Again,
    >  the DR is a particular choice for the AP.  And there should be no
    >  confusion between the AP and a DR.
    >  John
    > >
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