A GPS system comprising a GPS receiver for receiving and processing a GPS signal is provided. The traffic information receiver is adapted for receiving traffic information signal and a storage device for storing the GPS signal and the traffic information signal. The GPS receiver comprises a wireless receiver and a processor. The wireless receiver is adapted for receiving the GPS signal. The processor is adapted for controlling the wireless receiver and rotationally storing the GPS signal and the traffic information signal at a predetermined time period, and then transmitting the stored GPS signal and traffic information signal, in order, to the storage device, wherein the information corresponding to the GPS signal and the traffic information signal are transmitted according to a specific time or frequency setup by the processor.