The vehicle terminal equipment includes: control unit (CPU), display unit (optional), GPS, GPS antenna, GSM mobile phone (or other communication modules), and anti-theft alarm (optional). The main functions are:

　　-Anti theft alarm function

　　When an emergency occurs, the user can trigger a hidden alarm button, and the vehicle unit will automatically transmit the position data from the GPS receiver to the monitoring center through the SMS function of the GSM phone.

　　-Navigation function

　　GPS provides accurate data on the position, speed, and direction of moving targets, with an undifferentiated positioning accuracy of around 10 meters and a differential accuracy of 3-5 meters. The system can navigate through the dispatch center or store electronic maps on the terminal. The display unit can display the position of the moving target on the electronic map in real-time. Based on the destination, choose the best route to travel and provide a yaw alarm.

　　-Call function

　　The onboard GSM phone can make voice calls and can be removed for normal use when the user leaves the car. Several communication methods generally require data to speech compatibility and can be controlled according to commands from the command center to achieve the function of data to speech conversion. For example, if cluster communication is used, after the vehicle alarms, the monitoring center will grant channels to monitor the situation inside the vehicle

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