You have plenty of choices when it comes to buying a portable GPS navigation unit.

There are not only different brands of which Garmin, TomTom, Magellan, and Navigon are the leaders, but you also have a rich selection of features — wide screen, voice directions, traffic, route assist, Bluetooth for hands-free cell phone use, lane assist, fuel-efficient routing, world clock, calculator, currency converter, weather forecast, free map updates, worldwide maps, music players, photo display, and touchscreen.

You can take a portable GPS with you from vehicle to vehicle, to rental cars, walking in a city, on a bicycle, or in your home or hotel to locate restaurants, banks, or other points of interest.

Once you own a portable GPS, you'll find more uses for it than you imagined and wonder how you ever did without one.