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    Re: Lindy Line
    From: Brian Whatcott
    Date: 2002 Dec 7, 06:42 -0600

    At 03:53 PM 12/6/02, George Huxtable, you wrote:
    >...a solution to the shortest-path
    >problem. It can never involve a sudden turn through an angle on to a new
    >course, because if one's path involves such a change of course, one can
    >always shorten it a bit further by cutting across, or smoothly rounding,
    >the angle. So it's intuitively obvious that the shortest ship's-path must
    >be a smooth curve with no corners, a condition that's met by choosing an
    >initial great circle (and a final one) that merges smoothly at a tangent
    >into the constant-latitude leg of the course. Just as Walter (and Bill
    >Noyce too) have suggested.
    >George Huxtable.
    Divagating briefly, I note that a flight management system fitted to
    some aircraft (Rockwell-Collins FMS800)  allows one to select
    a prospective change of heading in a smooth turn onto a new
    course when approaching a waypoint,
    or a change only at the waypoint (or no change at all....)
    Brian Whatcott
       Altus OK                      Eureka!

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