GPS Sat Nav And How You Can Use It Sat Nav is a two element system that has a display unit and a GPS data receiver. GPS navigational satellites send signals to the reciever and send that information to the display unit. The various satellites detect the signals sent about and the GPS unit is then able to pinpoint it's exact location on the planet. Many different features are incorporated into the unit including maps and showing...... Source : Sirf Gps Receiver
