Here are the steps to be driving, riding, and watching (Be safe, if you are diving, do not watch screen!!)
Step 1 Put in DVD.
Step 2 Play DVD (Do not leave it at the front menu, if you do not start the DVD you will not be able to start it after you begin to drive.)
Step 3 While playing - Hit the second from the bottom button on the right hand side of the DVD screen and then press the forward Seek Button. (You may
see a little flicker)
Step 4 Now disable the parking break and make sure that the DVD stays on.
Step 5 Enjoy
If you did everything correct you will notice that all the features are disabled. If you are at the main menu of the dvd you will not be able to select play movie or any features.
If you would like to stop the dvd, you must hit the top right button first. Then it will bring up the safety lock if you are in motion or parking break off.
I got DVD-R to play fine in mine, but the +R are having some problems.