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    Re: Navigating Around Hills and Dips in the Ocean
    From: Richard M Pisko
    Date: 2003 Aug 16, 23:08 -0600

    On Sat, 16 Aug 2003 18:27:33 +0100, Dr. Geoffrey Kolbe wrote:
    
    >For a map of the lows and highs of the ocean's surface, see:
    >http://www-aviso.cls.fr/html/applications/geophysique/199901_uk.html
    >
    In the text is the statement:"These differences can generate sea level
    variations of over 100 meters between two ocean regions thousands of
    kilometers apart. "
    
    >But there seems to be an anomaly in the map shown. The map of the world
    >(shown on the left) is colour coded and there is a colour scale to the left
    >of the map which ranges from +80 to -80 metres. This would seem to accord
    >with David Hoyte's statement that the mean surface of the oceans does vary
    >by up to 200 metres. But the map on the right is a detailed blow up of the
    >Indian Ocean. This is also a colour coded map, but the scale to the right
    >of the map only ranges from +5 to -5 metres. This map shows a range in
    >height over the Indian ocean of around 10 metres, whereas the large world
    >map shows a variation of at least 80 metres for the same region. There
    >would appear to be an error here somewhere.
    >
    Yes, your eye picked that up where mine would have passed over.  Thank
    you.
    
    
    --
    Richard ...
    
    
    

       
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