so basically ive been searching all over for some good info on whats needed to hook up a backup camera, tv tuner, and dvd player to my factory 16:9 navigation system. I recently converted from the 4:3 and would like to uprade the cars entertainment system a little bit. I have been looking and it seems like TVonNAV is a popular choice for a module to connect all these components but i cant find any info on them and am not sure exactly how all this works. Basically i want to kno what is needed to connect these three things to my factory nav and be able to control them via the radio. I have found a module here BMW X5 TV Nav Video Input Interface. Connect a DVD Player, TV Tuner, Reverse Backup Video Camera, iPod Video, Aftermarket Navigation Or Other AV Source To Your Car's OEM GPS Navigation Headunit - LCD Screen Display - Nav System. but still am not sure if its all i would need...any help would be great!