Car GPS units are easily to find in local stores and sell in the $100-$150 range. Even less on sale. Motorcycle specific GPS receivers from the same manufactures have to be special ordered. They seem to have the same specs but cost $650 to $800. I cannot find any motorcycle specific GPSs to look at in the stores. Aside from a water proof case what is the difference between a car and motorcycle GPS? Recommendations on what to buy and mounting on the Versys?