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    Re: Navigating Around Hills and Dips in the Ocean
    From: Richard M Pisko
    Date: 2003 Aug 16, 23:07 -0600

    On Sat, 16 Aug 2003 11:11:42 -0300, Trevor J. Kenchington wrote:
    >While I agree with George that there would be no virtue in routing ships
    >around the hills and valleys created by gravity anomalies, in order to
    >save the energy cost of climbing the hill,
    ... there should be no energy expended following the equipotential
    surface at all ...
    >there _might_ be some benefit
    >in avoiding these other types of hills.
    ... and the hull would sink deeper into the fresher water, which would
    change the flow characteristics even if the displaced water is of the
    same mass ...
    >I would suspect that it is at
    >most a minor consideration in vessel routing (avoiding of benefiting
    >from the Gulf Stream current would be of far greater concern than its
    >effect on elevation) but perhaps somebody takes it into account.
    I think you hit on an important factor there, with the Gulf Stream
    current; and perhaps the expected wind patterns.  But again, except
    for the displacement of a plumb line (or rather, a theodolite level
    vial bubble) near a mountain range, this is all theory to me.
    Richard ...

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