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    Re: Turning Off the GPS
    From: Richard B. Langley
    Date: 2006 Apr 5, 12:53 -0300

    But the U.S. economy is heavily dependent now on GPS so it is extremely
    unlikely that the complete GPS system would be shut off -- about as unlikely
    as the European Union deciding to shut off the future Galileo system. Also,
    the U.S. military no longer "controls" GPS. It has been under joint
    military/civilian "control" for some time now.
    -- Richard Langley
       Professor of Geodesy and Precision Navigation
    On Wed, 5 Apr 2006, Marcel Tschudin wrote:
    >Please correct me if I should be wrong: Since GPS is controlled by the US
    >military it only needs a decision from the US administration to swich it
    >off. This is, to my understanding, the reason why Europe decided to set in
    >place their own system called EUREKA.
    >On 4/5/06, Lu Abel  wrote:
    >> With all respect, Gordon, it would take a lot more technology than the
    >> terrorists have to turn off GPS much less to make it give incorrect
    >> positions.   GPS uses satellites.  One would need satellite-killer
    >> missiles to "turn off" GPS.  Only two or three countries (USA, Russia,
    >> China?) have the technology (which, BTW, includes the technology and
    >> infrastructure to track and identify the target before saying to the
    >> missile "go get 'em").  To make GPS give the wrong position would
    >> require taking over the US's GPS control centers and I'm sure the US
    >> military has put a lot of thought and effort into preventing that.
    >> There are GPS jammers available on the arms market, but they work only
    >> over a small theater of operations.  Nowhere I'd be sailing, hope you
    >> won't be there either.
    >> Last but not least, terrorists are interested in, well, terror.  I
    >> suspect they'd far rather kill a few thousand of their perceived enemies
    >> than inconvenience them by turning off GPS....
    >> Lu Abel
    >> Gordon Talge wrote:
    >> > Just for the heck of it, I wonder what would happen,
    >> > if some terrorists managed to turn off the GPS system, or
    >> > maybe even better, have it give the wrong positions.
    >> >
    >> > I have noticed that a lot of people seem to say they keep
    >> > a sextant and tables, etc, for backup. The problem that I
    >> > see with that is it takes a lot of practice to get good at using a
    >> > sextant and working out sights by hand. Someone who has
    >> > only tried out their sextant on a calm day or on the beach,
    >> > may find it hard to get a decent shot on a pitching boat
    >> > or ship, and then work out a sight where one slip of a
    >> > plus or minus, or wrong column, would make it all for naught.
    >> >
    >> > BTW,
    >> >
    >> > Has anyone seen those German films of the U-Boats during World War II
    >> > in the North Atlantic pitching and rolling? I start getting seasick
    >> > just watching it. I saw one where a German Officer was taking a noon
    >> > sight on a sub like that. They may have been the enemy, but they
    >> > sure had guts. (It took guts to stand up to them too)
    >> >
    >> > -- Gordon
    >> >
    >> >
     Richard B. Langley                            E-mail: lang@unb.ca
     Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
     Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
     University of New Brunswick                   Fax:      +1 506 453-4943
     Fredericton, N.B., Canada  E3B 5A3
         Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/

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