Three-dimensional navigation is the primary function of GPS. Aircraft, ships, ground vehicles and pedestrians can all use GPS navigators to navigate. The car navigation system is a new technology developed on the basis of the global positioning system GPS. The car navigation system consists of GPS navigation, autonomous navigation, microprocessor, vehicle speed sensor, gyro sensor, CD-ROM drive, and LCD display. The combination of GPS navigation system and electronic map, radio communication network and computer vehicle management information system can realize many functions such as vehicle tracking and traffic management.

　　(1) Vehicle tracking

　　Using GPS and electronic map, the actual position of the vehicle can be displayed in real time, and can be zoomed in, zoomed out, restored, and changed at will; it can move with the target to keep the target on the screen; it can also realize multi-window, multi-vehicle, multi-screen track at the same time. Use this function to track and transport important vehicles and goods.

　　(2) Provide travel route planning and navigation

　　Providing travel route planning is an important auxiliary function of the car navigation system, which includes automatic route planning and manual route design. The automatic route planning is that the driver determines the starting point and destination, and the computer software automatically designs the optimal driving route according to the requirements, including the calculation of the fastest route, the easiest route, and the route with the least number of highway sections. In manual route design, the driver designs the starting point, ending point and waypoint according to his own destination, and automatically establishes a route library. After the route planning is completed, the display can display the designed route on the electronic map, and at the same time display the vehicle running path and running method.

　　(3) Information query

　　Provide users with databases of main objects, such as tourist attractions, hotels, hospitals, etc., users can display their positions on the electronic map. At the same time, the monitoring center can use the monitoring console to query the location of any target in the area, and the vehicle information will be displayed on the electronic map of the control center in digital form.

　　(4) Traffic command

　　The command center can monitor the running status of vehicles in the area and make reasonable scheduling of the monitored vehicles. The command center can also communicate with the tracked target at any time to implement management.

　　(5) Emergency assistance

　　Through the GPS positioning and monitoring management system, emergency assistance can be provided to vehicles in danger or accidents. The electronic map of the monitoring station displays the help information and the alarm target, plans the optimal assistance plan, and reminds the on-duty personnel to carry out emergency treatment with alarm sound and light.

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