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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
    >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
    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
      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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