I use my android (Samsung Galaxy S4) phone for GPS. I purchased the CoPilot Live GPS app which allows me to plug in the weight and height of my coach to avoid roads I shouldn't be on. It also has the maps loaded locally on the phone so you don't have to have a cell signal. I then bought
THIS PHONE CRADLE to put the phone in which keeps it charged as well as I can run Pandora over the coach stereo if I want to. I take the cradle out of the coach and leave it in my daily driver and use it there when I am not using the coach. This setup works well for me.