Traded in the 2010 ,3500 and got a used, 2014 , 2500 Laramie, I live in the country and went to Sacramento, Rocklin, Roseville area about one hour away. So when I was going to head for home I wanted to use the Nav. My normal route would have been, take the freeway system and 45 minutes later I would be home. But not today, arteriole roads for the first 10 or so miles and then county roads then dirt roads and such, over a hour and 35 minutes later I was home ? Boy I know the area and now I have no confidence to use it the GPS if I was out of town and pulling a trailer. I tried to go to the settings and see if it was programmable for routes, I have used a Tom-Tom and Garmin a lot for work, so I know a little about the GPSs. Truck has 18000 miles and had 15000 when I got it. No idea of any updates were performed. Love the truck but hate the TMS and now the GPS. Will make a dealer visit to check for up-dates and try to change the TMS so I can run 60 psig in the rear tires without the warning lights.