The Global Positioning System (GPS system) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit. The GPS works in any weather conditions, anywhere in the world, 24 hours a day. GPS satellites circle the Earth twice a day in a orbit and transmit signal information to the Earth. GPS tracker (reviser) takes this information and use trilateration to calculate the vehicle’s exact location. The GPS tracker compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS tracker how far away the satellite is. Now, with distance measurements from a few more satellites, the GPS tracker can determine the vehicle’s exact location and display it on the map and thus you can see it on your PC or smart phone screen.

The GPS tracker must be locked on to the signal of at least 3 satellites to calculate location of the vehicle – latitude and longitude and vehicle movement. With four or more satellites in view, the GPS tracker can determine car’s location with three parameters – latitude, longitude and altitude. Once the car’s location has been determined, the GPS tracker can calculate other information, such as speed, track, trip distance, distance to destination, idle time, parking time and more.