Garmin 010-C0884-00 Bluechart G2 Microsd Vision HD is our premium marine cartography for use with Garmin chartplotters. It includes all the features of BlueChart G2 HD charts and adds Garmin exclusive Auto Guidance 3.0. Garmin Auto Guidance 3.0 technology quickly searches relevant charts to suggest a course according to your boat's dimensions and creates a visual path that seeks to avoid low bridges, shallow water and other charted obstructions. With version 3.0, Auto Guidance can guide the user and in and out of more places more effectively, including entering and exiting marinas. BlueChart g2 Vision HD features seamless chart presentation with 1-foot HD contours that provide a more accurate depiction of bottom structure for improved fishing charts and enhanced detail in swamps, canals and port plans..