We purchased the Rand McNally RV GPS for the I-pad mini. It does require cell data capability to function otherwise a GPS antenna must be purchased too, they’re pretty inexpensive actually. It does a fairly good job but entering an address was a PITA for me. The Mrs. recently found better ways to do it, so I let her handle it. So far it has worked well and routes you according to RV type, rig length, height, width, and weight along with route preferences. The $99.99 price tag was a bit shocking for an app though. So far I give it a thumbs up.