I recently bought a 2005 e55 amg. The car has the Harmon audio system with the big screen and navigation. I want to use the navigation for ****s and goggles (even though I’ve heard it’s terrible) but I have no clue what cd to buy. There are all sorts of ones online ranging from $15 to $200 and I have no clue what I need or what it looks like. I have the dvd system thing in the trunk for the navigation cd just no cd. If anyone could help that’d be awesome! Thankyou in advance.