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    Re: Navigating Around Hills and Dips in the Ocean
    From: Keith Williams
    Date: 2003 Aug 19, 08:58 +0300

    George says: "It's possible to go from one value of g to another, always
    > an equipotential path, and there will be changes in elevation above
    > the Earth's centre along that path, but being an equipotential path,
    > there will be no work done against gravity. None at all. In fact, this
    > is exactly what
    > happens when a ship travels from one latitude to another and from one
    > value
    > of g to another, over the oceans."
    Can we have further explanation of this? My brain tells me that moving
    along an isobar (to make a simple analogy) can't move you to an area of
    higher pressure. Are equipotential shells not analogous to isobars?
    Keith Williams

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