Here are some pics of the completed installation of the video input. The RCA video input was installed in the switch blank next to the AUX plug. This was chosen because the AV cables usually split right at the end so you really can't put the video jack six inches away from where you want to plug the audio in. This will, hopefully, look a little cleaner and less conspicuous than a variety of AV connectors going into the nav. The actual switch blank was swapped with one of ones next to the tow/haul switch because those less complicated in the back.
The first swtich turns on Wile E's speed pulse generator allowing all of the nav functions to be accessed while moving. The second swtich provides 12v current to the reverse wire input of the nav turning on the backup camera display. The third push button switch toggles between the stock backup camera input and the new video input.
There is a Radio Shack adapter that converts dual RCA to stereo headphone-plug.
The "Check Surroundings for safety" is an integral part of the backup camera display. I believe the nav software can not easily be changed to eliminate this. Fortunately, it appears below many widescreen displays. And, it never hurts to be reminded to look around once in a while.
All you really need to be able to do to accomplish this is take apart some dash components, unbolt the nav 10mm bolts, cut, strip, and solder some small wires (about 12 connections), and drill a few holes into plastic to install switches (all SPDT).
All parts were obtained at Radio Shack except for the SPG which was purchased from Wile E Tundra. This is not necessary to enable auxilliary video input. The 10mm bolts that hold the dash in are easily dropped further down into the dash but you can get them at AutoZone.
Try to get all of your parts at Radio Shack in one or two trips because they constantly are trying to sell you mobile phone services for some reason these days. It's strange that they sell parts to people who build their own electronics but every time I go in there, they are talking to someone about their mobile phones. I mean, you can't even drive 5 blocks or walk 30 yards in a mall without running into a mobile phone store or booth so I believe I will be able to find a mobile phone store when I need one once every two years or so. I'm in there to buy a $3 switch and it's "Who's your mobile phone provider?" I'm wondering what I can say to get them to shut up about it next time.
I'm not really good at documenting wiring schematics but I will be happy to monitor this thread, daily, and answer whatever specific questions anyone has. And, of course, never watch video from your video iPod or portable DVD player while driving...this is only for playing video games on the highway.
Re: Getting the stock NAV to accept DVD output
He is a mighty smart cookie thats very helpfull. I am just to darn lazy to do write ups cause there so time consuming with stopping for pictures and note taking. 
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