Once the vehicle returns to a predetermined point, the device is removed and the data downloaded to a computer for evaluation. "Passive" devices store GPS location, speed, heading and sometimes a trigger event such as key on/off, door open/closed. Typically they are classified as "passive" and "active". Several types of vehicle tracking devices exist. Urban public transit authorities are an increasingly common user of vehicle tracking systems, particularly in large cities. Vehicle information can be viewed on electronic maps via the Internet or specialized software. 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.
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