How the system works is quite simple. For example, someone successfullyviolates your ignition system and drives away in your car. The GPS receiverbegins tracking your the vehicle's movement, speed and other information. This data is sent via the cellular phone to a monitoring station. At the monitoring station the vehicle is observed on a computerizedmap by the operator.
Law enforcementcan then dispatch units to intercept the vehicle.
Some GPS units come withmany options, one of which will actually safely disable the engines fuelpump or ignition from the monitoring station, at the intercepting officer'srequest, causing the vehicle to slowly come to a stop. GPS systems like this are a welcomed technology to the tracking andlocating of vehicles. General Motors is one of the first car makers to introduce a GPS systemon their new cars. The OnStar system, available exclusively on Cadillacs,which integrates on board advanced vehicle electronics with GPS satellitetechnology. Units come with a hands free cellular phone, linking the driver andthe vehicle with the OnStar center, where advisors provide real time,person to person help.