Had been using a GoodSam GPS which is a repackaged Rand McNally. During our cross country trip, it started to just turn off on its own. It wasn't the power, and I had three different power connectors so it wasn't the cable. Just turned off by itself. Then it started to reboot and turn off when I tried to turn it on etc.. So I purchased a Garmin RV 770. Boy what a great screen, but the first four times I used it it sent us to the wrong address, city, directions. Turns out if you put the zip code in, it does not have a problem getting you to where you need to go. It is frustrating not knowing about the zip code and my very old Garmin never need the zip code to find the address. I have not tried to load the Rout-1-USA data yet.