Well, I'm not sure if nav sat antenna is a factory weakling or it's faulty but I couldn't get a half way decent signal any place inside the car. I ended up mounting it under the wiper cowl with great results, full signal.
I hooked up the VSS, too. However, when it says "Speed Pulse" in the 'Connection Menu', is that supposed to be your MPH? If so, mine reads pretty far off ... at 60 mph it says ~95.