Garmin StreetPilot c320 GPS Vehicle Navigator
With a simple touch screen interface, automatic route calculation to any destination, and turn-by-turn voice-prompted directions, the StreetPilot c320 GPS navigator is a powerful companion for your adventures on the road. If you go to Garmin's website, you can download updated drivers, computer to c320 unit interface that allows you to customize the unit for your purposes. With the standard SD card slot, you can upload huge areas with good detail. That sounds good enough for me since I always get lost!!