1. Most portable GPS systems do not work well in a car. They are almost impossible to use while driving. They prefer a direct look at the sky.

2. Portable GPS systems are still tech toys. The battery life is short, you need to know about how the 50 sub-menu items work, and price does not equal performance.

3. If you plan to stay inside a major city just get a good street map and learn to read it. It is faster and usually more accurate.

4. If you want a decent portable system get one that does more then just GPS. Get a Garmin PocketPC. That way you can keep addresses, phone numbers, and mapquest or pocketpc streets and maps directions on the pocketpc.

5. If you really want a portable GPS system - get a used one on ebay a old Magellen GPS 12 for $50 or Newer sportrak pro for a few bucks more. Everything above those two items are features you do not need.