Garmin Auto Guidance 3.0 technology is now capable of providing routing guidance¹ to virtually any accessible destination on the water.Up to 1-foot HD contours provide a more accurate depiction of bottom structure for improved fishing charts and navigation in swamps, canals, marinas and port plans.Aerial photos of ports, marinas, bridges and navigational landmarks and realistic "view from space" high-resolution satellite imagery.Shaded depth contours and intertidal zones with spot soundings.Detailed nautical charts, in vector object oriented format, derived from government charts and private sources to provide port plans, depth contours, navigational aids, and tides and currents in a seamless chart presentation.Premium Mapping and Graphics Capabilities Bathymetric coverage of offshore features from Vernon Basin to Alaminos Canyon including DeSoto Canyon, Mississippi Canyon and Green Canyon. Also includes Lake Ponchartrain and Lake Maurepas to Vermilion Bay and Lake Calcasieu. BlueChart® g2 Vision® HD - VUS515L - Brownsville - Key Largo - microSD/SD Coverage: Detailed coverage of the Gulf of Mexico from Brownsville, TX to Plantation Key, FL including Corpus Christi, TX, Matagorda Bay, Galveston Bay, Port Arthur, TX, Atchafalaya Bay, the Mississippi Delta, Chandeleur Islands, Tampa Bay and the Florida Keys west of Key Largo.