Hey, the GPS module we sell has both the GPS and a compass sensor on it, designed to connect with pixhawk systems so it does not just plug into Arduino. But you can use it with Arduino. The GPS needs to go to the UART port on your Arduino and if you need to use the compass that goes to the i2c port. The unit needs to be posted by 5v
If you need the pinout, just remove the plastic case of the GPS and the pins are labelled on the PCB.
If you need more help just let me know