Apr 25, 2010 by bbudman
Rated a Very Helpful Review
Pros: Built in maps. Auto and marine capable.
Cons: Poor speaker. Expensive. Optional maps expensive.
Summary: I have used several different GPS devices over the years and Garmin builds some of the best automotive and boating units you can buy. My latest purchase was the Garmin GPSMAP 640. Although expensive, this unit packs plenty of features with the weekend ... read more