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    Re: AP terminology, WAS: 2-Body Fix -- take three
    From: John Karl
    Date: 2009 Nov 11, 20:00 -0800

    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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