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    Re: Pilot Chart Anomaly
    From: Philip Ouvry
    Date: 2002 Feb 9, 20:11 +0100

    Steven has made an interesting observation.   However going back 200 years
    or so one has to remember that gathering reliable navigational data was very
    sketchy.   For instance much of the data on UK charts is based on surveys
    conducted in the late 19th century.   The UK Hydrographic Office is very
    loathe to accept up-to-date surveys from local yacht clubs, sub-aqua clubs
    or fishing fraternities.   A hundred years ago ocean charts consisted of
    lines of soundings which indicated that another vessel has passed that way
    without harm.   Modern electronic sophistication has enabled charts to be
    much more realistic;  but that has not prevented several cruise liners from
    crunching their keels!   Pilot charts showing weather and current
    predictions were very inexact particularly in areas where there was little
    or no shipping.
    Philip Ouvry

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