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    Re: GPS and Great Circle
    From: John Kabel
    Date: 2002 Oct 8, 15:35 -0400

    I have just done a quick experiment with my Lowrance Globalmap 100.
    Picking a waypoint due west of here sends me on a great circle route
    starting in a direction always north of west, the exact azimuth
    depending on how far around the globe I put the waypoint up to 180
    degrees away.  It is what I have always taught my GPS students:  the
    receivers always send you on a Great Circle route.  I don't know of any
    models which allow for rhumb line navigation.
    
    John Kabel
    London, Ontario, Canada
    
    > I am a lurker in this group and actually know only a smidge celestial
    > navigation. I hope my question is not out of place here. I am curious
    > whether my GPS follows the great circle route or Mercator rumb line when
    > plotting long distance courses?
    > Thanks for patience with the dummy,
    > Joe...
    
    
    

       
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