The application shown above is a vehicle and parcel tracking system using GPS and GPRS technology. The GT-540P collects information including GPS location, speed, heading and events such as key on/off, door open/close and transmits the data in real-time via cellular or satellite networks to a computer or shipping warehouse for evaluation. Other than vehicle tracking, package loading or delivering will be transmitted as well. When a cellular network is available and GT-540P is connected, it transmits data to a server; when a network is not available the device stores data in the internal memory and will transmit stored data to the server later.