IW
Ignore those taking the micky out of your spelling mistakes.
As far as I know, none of the car GPS units are any good for aviation. But, as posted already by someone, if you happen to be using a general purpose PDA in the car then there is some software you can run on that which is usable for aviation.
PocketFMS and
Memory Map are two examples.
Whether these are usable or not is a matter of opinion, and it does depend on the PDA and how big the screen is. Personally I would not use a normal PDA for anything serious in this respect, on grounds of software reliability (the pocket/pc operating system has a tendency to crash) and ergonomics (little fiddly buttons, etc).
If you want a box which does both road and air nav then look at the Garmin 296 or 496.