Don't get the Magellen that they push.
It sucks big time. A lot of towns are not on the Magellen
And that makes it almost impossible to go the routes you want to run.
Scenic and or lesser used US hwys seem to be excluded from the Magellen.
Plus it is not user friendly.
Use your smart phone and a good app like MotionX.
It talks and we use it in place of the Magellen. It just does not have low underpass info for RV. But we watch the signs and have never had a problem.