Garmin Street Pilot

If you're venturing into unfamiliar territory, this device is the greatest. It makes navigating dark or foggy streets much easier too, you know your turn is coming before you pass it.
I got mine as a gift before I got into Real Estate, it's a big help for finding addresses or for finding your way home from an unfamiliar city. Do not get a small screen GPS, spring for the large screen like this one. The small screens are too difficult to see when you are driving.
My only gripe is, that when it comes time to upgrade the software....it is expensive. If you don't upgrade, then new construction will be a mystery.