My car has a constantly updated database of all sites and potential sites and bleeps at me about 400yds and 200 yds and if I'm *cough* over the limit it bleeps louder and louder till I slow down.
plus if I press a button thats hidden I get a proper 'Human' who asks where I'd like to go and teh car is then downloaded with directions, if teh traffic is crap they automagically redirect me round it. Also If I need to order flowers, book a hotel etc they will do all that for me as well.
Now thats what I call sat nav....