I have 2014 Ram 1500 with a RA3 radio. I currently do not have navigation and I would like to get it for my truck. I had thought that I needed to have a RA4 radio with navigation for it to work. I don`t really know much about the radios in these trucks but I happened to be reading that a RA3 can have the navigation activated by the dealer for a cost. If so, any idea what it costs ? Has anyone ever had their RA3 activated with navigation? Is there a navigation button on the radio as I don`t see one anywhere or does the touch screen button show up once activated.