Car GPS

Car GPS uses position data to locate the user on a road in the unit's map database. Using the road database, the unit can give directions to other locations along roads also in its database. There are three kinds of navigation systems: the kind that are designed to be built into a vehicle, software systems for use with a laptop computer and portable GPS units that can be tossed on the dash of a vehicle. Some portable units are even small enough to fit easily into a pocket for use on a boat, while hiking or practically anywhere.