I had to set up the Bluetooth on my TomTom Go 700 with it plugged into the car with full GPS signal. My TT loses signal indoors 95% of the time.

The maps are out dated by about 2 years or more I reckon. TT takes me across fields on a new bypass near us which was opened over 2 years ago. Also it tries to get me to turn left out of our village into a oneway system that was put in place over 3 years ago.