The is not a product for the average driver. It is a specialized tool—a time capsule from the era when car navigation required a trunk full of DVDs and a degree of patience. For the restorer of a 2006 Acura TL or a 2005 Cadillac SRX, finding a clean, readable copy of this disc can mean the difference between a functioning factory infotainment system and a blank screen reading "No Map Data."
: This disc is primarily used as a bootloader. The NDDN-W56 lacks internal flash memory for its operating system; if the car battery is disconnected or replaced, the unit resets and will not function until the map disc is inserted. Media Support nddn w56 76031 software map disc21