GPS has been under "Selective Availability" since it was declared operational. This limits horizontal positional accuracy to 100 metres at the 95% confidence level. See http://www.cnde.iastate.edu/staff/swormley/gps/check_sa.html for more info. -- Richard Langley Professor of Geodesy and Precision Navigation
On Mon, 21 Dec 1998, Fernando Cabral wrote: >Hello > > >This morning I was trying to set my watch using my GPS. Taking a fix in >my >backyard I noticed the position reported was displaced about >100 meters to the East (Latitude was the same). It aroused my >curiosity. I took the GPS to my office and read it again. >I found about 80 meters to the East again. > >This error seemed too big and too systematic to be taken >as an accident. Could it be the case that the American >government is lowering the GPS precision because of >the war? Has any one noticed any similar behaviour? > >- fernando > > >-- >Fernando Cabral Padrao iX Sistemas Abertos >mailto:[EMAIL PROTECTED] http://www.pix.com.br > mailto:[EMAIL PROTECTED] >Fone: +55 61 321-2433 Fax: +55 61 225-3082 >15? 45' 04.9" S 47? 49' 58.6" W >19? 37' 57.0" S 45? 17' 13.6" W > > > =============================================================================== Richard B. Langley E-mail: [EMAIL PROTECTED] 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/ ===============================================================================
