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    Re: Allowing for current
    From: Paul Hirose
    Date: 2009 Oct 02, 13:17 -0700

    George Huxtable wrote:
    > Estimate the
    > passage time, sum up the overall tidal displacement that would occur during
    > that period (now non-zero), make the appropriate offset from the course to
    > destination by a simple vector diagram, and then steer that course, without
    > bothering about any "cross-track error" that may arise.
    That's known in air navigation as the "single drift correction" method:
    "The individual drift corrections, normally applied to a straight course
    to compensate for the cross-wind component, vary considerably during a
    long flight due to local variations in the wind-flow pattern; whereas,
    the net drift over the entire course may be small. If the aircraft were
    to compensate only for the net drift, so that the speed of the aircraft
    would not be reduced by excessive crabbing, the actual time in flight
    could be reduced." (U.S. Air Force Manual 51-40, "Air Navigation", 1955)
    The single drift correction would be applied to each heading of the
    no-wind flight plan. (It might have several heading changes to
    approximate a great circle course.)
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