I'm kind of searching for a reasonable GPS with a back up camera input and found the information is all over the place. For example on the 3 models below. The same looking port on each of them but the 5100 Max and 2100 says external antenna, the 2100 Max says AV input. Are they all for the same purpose, I can either use it for antenna or av input or does it have to be specific component as listed?
Navigon 5100 Max GPS Navigation
Navigon 2100 Max GPS Navigation
Navigon 2100 GPS
