The single metal connector with the black cable about 5-6mm dia is the GPS antenna connector.
The VSS signal is wired into the smallest connector on the far right of the NAV looking from the back.
Considering you have no signal would indicate an antenna issue.
2008 F01 - Sophistograu with Saddle Brown Leather
Night Vision, Digital TV, Heated M-Sport Steering Wheel + Paddles, Combox, 6NF Baseplate, 6NR Apps, Rear Entertainment System, Automatic Boot Close and Surround View Cameras.