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    Re: Pilots and Mariners
    From: Brian Whatcott
    Date: 2002 Feb 7, 20:59 -0600

    At 03:42 PM 2/7/02, Chuck Griffiths wrote:
    >... Most
    >pilots flying around the states plotting their "courses" on aeronautical
    >charts
    >are plotting rhumb lines on Mercator projections.
    ...
    >they generally follow radio navigation devices that
    >guide airplanes over great circle courses. Good marine navigators, of course,
    >know that a radio bearing to a distant non-directional radio beacon is the
    >initial bearing of the great circle track to that aid, and plot it
    >accordingly.
    ...
    >Chuck
    
    
    It has already been noted that airmen in fact, plot great circles on
    conical orthomorphic charts.
      The straight line on the conical orthomorphic has a different starting
    direction
      than the end. But it raises an interesting point: there is a class of navaids
      intended to indicate magnetic radial bearings - the VOR.   This too radiates
    great circle radials if the distance is extended far enough - so that at long
      range, the indicated magnetic radial is somewhat wrong....
    
    
    
    
    Brian Whatcott
       Altus OK                      Eureka!
    
    
    

       
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