I agree with Slowmachine - Both.
A dedicated RV GPS takes info on the vehicle and helps keep you out of trouble. Usually. My phone gps has taken me, or might have taken me, down roads a 30 ft C shouldn't go. Frequently.
Both. Cross reference. Navigator checks alternate possibilities . . . Both.
Ken, Chris, and Rusty D. Cat.
Itasca Cambria, Jeep Cherokee.
I've got a mind like a steel trap - rusty and illegal in 37 states!