Summary: The Garmin nuvi 660 was a very expensive gift for my husband. It worked fine for about two years and then the battery went. You need to be an engineer to replace the battery. The cost for an authorized dealer to do that is about what it would cost to replace the gps. The maps need to be upgraded continually at added cost. Other than that, the gps is easy to use when plugged into the cigarette lighter in the car.
Summary: This charging unit was not compatible with the GPS watch as was implied on the ordering system. So, now I will only use the in-home charging unit until I can find one that is made for charging in my vehicle.