I recently bought a used crossfire and assumed that it didn't have the navigation system since it was never mentioned to me in the sale. However my stereo has the "Nav" button and matches entirely in appearance to the stock nav units I've seen for sale on ebay. The only noticeable difference is that the little plastic tab in the middle of the six buttons at the top of the unit is black (between "c/c", "aud", opt" and "cd", "rad" "nav"). I was never given a navigation cd/dvd either.

Does this mean that I do have a nav system and all I need is a CD for it? I haven't been able to find any pictures of factory stereos without nav to compare it to.