[LeRoux Strydom]

For in-car use, get yourself an external antenna. These have magnetic bases so you can stick it on the roof of the car or somewhere on the dash when you're on the track. For more civilised driving, Garmin also sells a car-mount for most of their models.

I agree that the 60CSx is probably the most rugged, outdoor-oriented unit. If your need is not that extreme, Garmin makes many more units more suitable for in-car use. Stay away from most things non-Garmin.