GPS – Global Positioning System
http://www.aero.org/publications/GPSPRIMER/index.html, 08/10/2003
6. GPS GSM positsioneerimise seade, http://www.infors.ee/gps.html,
20/10/2003
7. GPS info "Mis asi on GPS", http://www.zone.ee/gps/info/gps.htm,
12/10/2003
8. GPS Tutor, http://www.mercat.com/QUEST/gpstutor.htm, 12/10/2003
9. Howstuffworks "How GPS Receivers work",
http://www.howstuffworks.com/gps.htm, 12/10.2003
10. minut.ee | GPS asukohamääraja lastele mürsiku õudusunenägu,
http://www.minut.ee/article.pl?sid=03/05/04/2230257, 20/1072003
11. Global Positioning System Overview,
http://www.colorado.edu/geography/gcraft/notes/gps/gps.html, 10/10/2003
12. GPS Portal: Global Positioning System introduction and services in
internet, links
to world wide, http://www.wowinfo.com/gps/, 22/10/2003
13. Harrison Chronometers,
http://www.harrisonclocks.co.uk/chronometers.htm,
29/10/2003
14. Garmin:What is GPS, http://www.garmin.com/aboutGPS/, 15/10/2003
15. GPS Drawing Gallery, http://www.gpsdrawing.com/gallery.htm,
22/10/2003
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annaabi.ee 
