Check your local laws before you go doing this. I know up here, the driver cannot be in view of any screen that is playing movies (that's not exactly how it's worded, but that is the intent).
I've known two people now that have gotten fines for having this done to their systems. One actually had his car impounded, but he was being a dick to the cop at the time. All they have to do is drive up next to you, see the screen playing a video and you're busted.
Personally, I do know how to bypass these systems as I used to install them on a regular basis...but I refuse to tell people. It's stupidly dangerous. All it takes is one second of not paying attention to the road and you're in serious trouble, and most likely someone else is too. I personally don't agree with people being able to watch a navigation system either as it is just as distracting...which is one reason I stopped installing these things.
