I found a small glitch in the navigation radio w/DVD. (I can't tell you if it's the same w/o DVD). I have an Ipod plugged into the front Aux and my Sirius radio plugged in the rear Aux. When I am playing the Ipod and decide to switch to Sirius, you would think pushing the rear Aux button would switch inputs. It doesn't. In order to switch from front to back you need to disconnect the cable going to the front Aux jack. The radio then automatically switches to FM. Then you can hit Aux again and select rear. Switching from rear Aux to front Aux is not a problem.