GM Genuine Parts GPS Navigation Start Up Discs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These discs provide the map information for navigation and route guidance. This data is stored on different media formats depending on the navigation radio. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE). ? WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov