On 2007-10-09 06:34:38 -0400, said:

The use of Global Position System (GPS) has become quite diverse from
automobiles, mobile phones, tourist facilities, city maps, and even
pet collars...
http://personaltechinfo.googlepages....and_its_future

Because I suspected some of the info (for instance, they're not in
geosychronous orbit) I checked wiki:
http://en.wikipedia.org/wiki/Global_Positioning_System

That's a far better article, even that they're updating LORAN (eLORAN)
as a backup system.

Article included an interesting reference to some TV antenna pre-amps
jamming the GPS for a whole area:
http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=43404&&pageID=1

--
Jere Lull
Tanzer 28 #4 out of Tolchester, MD
Xan's new pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI pages: http://homepage.mac.com/jerelull/BVI/