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    Aircraft drift; over wate.r Re: Amelia Earhart's aerial navigation
    From: George Huxtable
    Date: 2009 Nov 19, 19:35 -0000

    As one quite ignorant about air navigation, a few questions come to my mind.
    I can see the relevance of some sort of drift angle meter when flying over
    land, in establishing ground track direction from  relative motion of
    landmarks seen passing below.
    But how does that work over the sea? Presumably, one would be seeing
    whitecaps on the waves, or white-horses, that will tend to drift downwind,
    as the wave-tops move downwind. Is that speed of motion quite negligible,
    compared with the airspeed of a light aircraft? Is there some way of
    allowing for that motion? Or does this just add an additional uncertainty to
    the estimated track-angle of the aircraft? If so, what level of uncertainty
    would that be?
    contact George Huxtable, at  george@hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    NavList message boards: www.fer3.com/arc
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