A Vehicle Tracking System combines the installation of an Electronic Device in a vehicle, with purpose-designed computer software to enable the OWNER to track the vehicle's location. Modern vehicle tracking systems commonly use Global Positioning System (GPS) technology for locating the vehicle, but other types of automatic vehicle location technology can also be used. Vehicle information can be viewed on maps via the Internet or specialized software. Urban public transit authorities are an increasingly common user of vehicle tracking systems, particularly in large cities.

A GPS Tracking Unit is a device that uses the GPS to determine the precise location of a vehicle, person, or other asset to which it is attached and to record the position of the asset at regular intervals. The recorded location data can be stored within the unit, or transmitted to a central location database, or internet-connected computer. This allows the asset's location to be displayed on a map in real time.