[JackMS]

I have NAV and rear ent sys. I assume you are asking about playing a DVD on the NAV screen? Will not work. I imagine because it is against the law to watch "TV" while driving. Don't know why watching a navigation program is any different. Would be nice for the wife to be able to watch a movie up front while the kids watch one with the headphones in the back. Maybe noone would be telling me how to drive then.