ok i have the nav system and i know it reads dvds right? is there anyway to play them???

 

The answer is basically, no. You can get a seperate DVD player, (or XBox or PS2), and then there are several solutons for getting this to play on the Nav screen. The NAV screen requires component input, and the adapted boxes require a varying degree of splicing of wires.

I should also mention that your same question has been asked and answered dozens of times on this site. As a courtesy to other members, you really should do a search for answers before posting questions if you have not been reading along for a while.