I am not sure of how good or bad Tom Tom is on the Rams. I will say where I live I keep an old school GPS in the truck, (the Ram I had didn't have on-board Nav so I used it a lot), because if I go 5 miles north, 8 miles south of me there is no cell coverage. Depending on the day I might be half way to KY or half way to AL. So none of the Cell based ones work for me. Yes I can download an area I think I might end up in, and if I do great, if not? I traveled most of the way from Yuma AZ to the Grand Canyon on an old school GPS because, the way I went, there was no cell coverage. I have on-board Nav in both my Fords (not sure who makes it) that I use, but that old school Grarmin is still in the center console, just in case.