My GPS antenna came in today. The plug on the antenna was a bit bigger than the socket on the HU. I did some modification to the plug on the antenna and got it to work. GPS works very good without VSS so far. No delay in turns. I might not connect the VSS cable if it works fine without it. Waiting for SVXdc to reply to me about the USB cable still. He forgot the Hirose connector. Once I have that connector I might actually connect each cable to each pin in the HU USB socket using a small quick disconnect. This is probably not the best secure option for this but I think I'll do until I or someone can find the connector to make the harness.