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    Re: Is this quite the thing or not?
    From: Dan Allen
    Date: 2002 Nov 5, 15:08 -0800

    On Tuesday, November 5, 2002, at 12:29 PM, Rodney Myrvaagnes wrote:
    > BTW, there is a lot more redundancy in the satellite system than in two
    > receivers. You can usually see more than twice as many sats as you
    > need for a 3D fix.
    I realize that in peacetime the worries are small.  But check out this
    from a military intelligence site:
    "Hugh Blanchard suggests that a GPS jammer/spoofer that can render GPS
    receivers inaccurate within a 10-mile radius can be built for less than
    $400 from parts available at retail stores."
          -- http://www-cgsc.army.mil/milrev/English/MarApr01/adams.asp
    Events of the past year (9/11 & Sniper) show that quite a bit can be
    done on a shoestring.  It is terrorism that will probably degrade the
    GPS system, not equipment failure.
    So if one replaces a gyrocompass with a fancy dual GPS receiver then
    there is yet  another piece of equipment that will instantly be
    rendered useless if a GPS jam/spoof occurs.

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