A Vehicle Tracking System combines the use of automatic vehicle location in individual vehicles with software that collects these fleet data for a comprehensive picture of vehicle locations. Modern vehicle tracking systems commonly use GPS or GLONASS technology for locating the vehicle, but other types of automatic vehicle location technology can also be used. Vehicle information can be viewed on electronic maps via the Internet or specialized software. GPS tracker (reviser) takes this information and use trilateration to calculate the vehicle’s exact location. 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.