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    Re: How Many Chronometers?
    From: Lu Abel
    Date: 2009 Sep 18, 20:01 -0700

    I wonder if this is current data or "the way we used to do it."   My
    impression is that most US Navy ships have highly electronic bridges
    these days.   In fact, nuclear submarines go underwater for months at an
    end with NO surface contact; they are totally dependent on electronic
    navigation (specifically, an inertial guidance system) and I understand
    that when a sub resurfaces after 60 or even 90 days it's within feet of
    the location its nav system is giving.
    As far as EMP is concerned, most military electronic systems are
    supposed to be EMP-proof.    And there's always the option to seal a
    couple of Garmin GPS's in a metal container as a backup system.
    Apache Runner wrote:
    > That's interesting to know.   Do you know the reason why?
    > My own speculation is that they want to maintain a completely
    > electronic-free means of navigation under the possibility of some
    > extreme situation arising.    Perhaps in the event of a nuclear EMP?
    > >
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