Power for the module is obtained from a PC USB port. Take a scavenged USB cable and connect the red wire to both the module's +5V pin and the VCC pin of the RS232 Shifter [see diagram above]. The black USB wire is connected to the GND pin of the module and the GND pin of the RS232 Shifter. Now attach the RS232 Shifter to the PC's DB-9 serial port and connect the shifter's RX pin to pin 8 of the module and the shifter's Tx pin to the module's pin 9. Finally, plug the GPS antenna into the module.