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    Re: G-Capt on Celestial Nav in the commercial world.
    From: Lu Abel
    Date: 2016 May 12, 10:17 -0700

    If you actually read this piece, you discover that it an opinion piece,
    not a factual article.
    
    In it the author says "it is possible to experience a double failure [of
    the required two totally independent ECDIS charting systems]" -- but
    then gives NO specific examples of where/when/how such an event actually
    occurred.
    
    Also he's confusing a computerized charting program with GPS.  While
    commercial (ECDIS) charting systems have GPS integrated directly into
    them, what's better if both ECDIS systems go down -- a sextant or a
    simple, hand-held GPS??
    
    As always, a good navigator uses ALL possible sources of information.
    But at the same time, this author's logic is the same as saying that all
    ships should be equipped with masts and sails because "it is possible to
    experience an engine failure."
    

       
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