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    Re: How Many Chronometers?
    From: Byron Franklin
    Date: 2009 Sep 22, 08:25 -0700

    Yes,Most the Navy has a very electronic bridge,and uses it most the
    time, but, the magnetic compass on board is called " the standard
    compass" every half hour and every change of course regulations
    require a compass check between the gyro and the magnetic. On the
    Intrepid, I do remenber loosing gyro and steering the standard. The
    idea may be if you are in far deep water, do you want a electronic man
    or a navigator with you to take over in Emergency.
    
    On Sep 18, 11:01�pm, Lu Abel  wrote:
    > 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?- Hide quoted text -
    >
    > - Show quoted text -
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