We actually run 2 Garmin RV780's, and for the most part are pretty satisfied, but you always have to check on it. In fact just a couple days ago, after inputting the entire route they tried to take us on the Blue Ridge Parkway. As far as a previous post on the 770 with no detail, I don't know but it sounds like not going in close enough, the 780 has plenty of detail IMO. We do more than 10,000 miles year and stay at lots and lots of campgrounds, and 99.9% of them are in the database and in the right place.