I have a double-din sized Pioneer Navigation system-AVIC-D3. It uses 2 DVDs for the maps and point of interest (gas stations, food, libraries etc...) and will store the map info in the system so you can remove the disc. I have the disc somewhere but they are old so it would probably be a good idea to get the updated versions. Plays normal DVDs also. 6.1" screen with touchscreen controls. 3 pair RCA outputs (Front, Rear, Sub/Non-Fading) for subs and a pair for other monitors. XM radio ready so you can also get live traffic info. Back up camera ready. Front A/V mini-jack. ipod capable. Bluetooth capable. Basically it comes with a lot of stuff. You can view here all the specs: http://www.pioneerelectronics.com/PUSA/Car/GPS-Navigation/AVIC-D3 This was like $900 or so when I got it, I don't need it or use it anymore. Asking $500.