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
