All factory NAV systems require a DVD to read the map data off of - the onboard GPS unit simply tells the system where to place you on the map.
If you drive with a DVD movie playing in the Nav screen, be prepared for a ticket as it violates Federal Law. It's a good law too, because the only thing you should be watching while driving is the road.
If you drive with a DVD movie playing in the Nav screen, be prepared for a ticket as it violates Federal Law. It's a good law too, because the only thing you should be watching while driving is the road.