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    Re: course, heading, track
    From: Brian Whatcott
    Date: 2002 Feb 7, 18:12 -0600

    At 07:04 AM 2/7/02, Trevor Kenchington wrote:
    >... aviation terminology does not
    >distinguish between what we surface-bound types call "heading" and
    >"course". Are aircraft so stable in yaw that the distinction is not needed?
    >Trevor Kenchington
    Trevor here asks a leading question. This does seem to be
      a salient difference between air pilots and sailors in general.
    For the airborne, a persistant yaw is a symptom of ineptitude, or much
    worse, a consequence of asymmetric thrust. Their object is to cross
    country without yaw. Their higher speed exacts a bigger penalty for
    For the sea-borne, a persistant yaw is an unavoidable consequence
      of sailing at any point off a following wind (if then).
    For one then the difference between the bearing of a destination and the
      heading is a compensation for cross wind: the other needs to compensate
    for yaw due to wind sidethrust, and for  tidal/current set as well.
      One supposes that an air pilot might undercompensate for cross wind when
    sailing, and a sailboat skipper might overcompensate for cross wind when
    Brian Whatcott
       Altus OK                      Eureka!

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