Topic fits here better than anywhere else I guess.

We got tired of using our cell phones for navigation and the service dropping out. So Amazon had a sale on the Garmin units so we got the RV660 model. Seems to work great, been playing around with it before we actually have to depend on it. You can load in your RV and TV length, width, height. It can operate in RV mode when you towing and in Car mode after you have dropped your RV at a camp site. It will even keep track of the mileage and a place to store maintenance item mileage like oil changes and so forth. Tracks near by banks, fuel stations, restaurants, repair places and so forth. Fairly big screen so its easy to see from the passengers navigation position. Has a good volume control so I can hear it over my old diesel engine.

Anybody else have one and can say how it works for you?