NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Is this quite the thing or not?
From: Dan Allen
Date: 2002 Nov 5, 15:08 -0800
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. Dan