GPRS wireless communication network or CDMA wireless communication network can be used, and data transmission can also be carried out using SMS.

　　Functions and characteristics of GPS monitoring system

　　1. GPS monitoring function

　　(1) Query Now

　　After the monitoring center issues an immediate command, the GPS terminal promptly uploads the location information (including longitude, latitude, azimuth, speed, number of satellites, and other information) and status information of vehicles, people, or pets.

　　(2) Remote tracking

　　The monitoring center can set the GPS terminal for timed tracking on the monitoring software, and can upload location and status information at a fixed time. Once the setting is successful, the GPS terminal will timely upload the information required by the monitoring center according to the command request issued by the monitoring center.

　　(3) Emergency assistance

　　When drivers or individuals wearing GPS terminals encounter special situations, they can use the emergency call button to seek help from the monitoring center. Once the monitoring center receives a distress call, the monitoring center staff can provide assistance or notify the police for assistance.

　　(4) Historical trajectory playback function

　　In the playback of historical trajectories, the system can view the location and route of vehicles, people, or pets on a certain day in historical information. What was the status and other information of the vehicle at that time;

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