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    Re: GPS direction: Rumb line or great circle
    From: Douglas Denny
    Date: 2009 Oct 3, 04:42 -0700

    I was reading the post on the mecca direction question and was
    wondering; when a (Garmin) GPS indicate a direction, does it follow a
    rumb line or a great circle?
    
    GPS uses spherical trigonometry so the answer is Great Circle.
    
    A rhumb line is a special curve called a loxodrome which spirals out from pole 
    to pole.  It has the special property of maintaining a constant angle to the 
    meridians. Hence on a mercator chart it is a straight line from place to 
    place.
    
    Douglas Denny.
    Chichester. England.
    
    
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