Most in-dash sat&#x2F;nav units aren&#x27;t allowed to play any video in most states. You can bypass&#x2F;disable it, but that can run you into liability issues.<p>I had a SatNav where an &quot;unable to detect park gear&quot; warning always showed up (I had a stick shift, so it the wires were connected to the hand-break). The guy at the shop couldn&#x27;t figure out why it was shorting so he just disabled it and said, &quot;Don&#x27;t watch DVDs while driving.&quot;<p>You know I never did use the DVD player in there ever, not even while parked, in the 5 years I had it.