Buy seperate one for the car. Wife has a 6100 tomtom and for straight out point a to point b it is way better than any bike sat nav. Comes with it's own little internet (free) which searches
POI brilliantly. Live traffic is spot on and diverts to miss it brilliantly. Without a doubt the best sat nav I have ever used. The bike one doesn't do mp3 so no good for me. I prefer the Garmin for creating a specific route, but it's crap in the car.