Here's the Setup using GPS Module/Shield in serial.
Wiring Diagram: https://www.e-gizmo.net/oc/kits%20documents/GSM%20REMOTE%20IO%20KIT/GSMIO-GPS%20interface%20connections.jpg
Setup: https://www.e-gizmo.net/oc/kits%20documents/GSM%20REMOTE%20IO%20KIT/sample%20guide%20using%20gps%20serial.jpg