Hi, I have a 2009 GS450H (not sure of the model as I live in Ireland, but it is a UK model) - Lovely car, but it doesn't have sat nav. I was wondering as it has the touch screen and everything, is is possible to upgrade it to get sat nav installed? Pain in the arse setting up my tom tom on the phone each time:-( I had a lexus before with sat nav and it looked exactly the same screen?