GPSMAP® 4000/5000 Series Owner’s Manual 5uSInG chartSusInGchartsusInG chartsYour unit has a basic worldwide imagery map. By purchasing an optional Blue Chart® g2 Vision™preprogrammed SD card, you can view detailed information for your region, including:Navigation Chart—displays all relevant navigation data available, including buoys, lights,cables, depth soundings, marinas, and tide stations in an overhead view.Mariner’s Eye—a view from above and behind your boat for a visual navigation aid.Fishing Chart—removes navigational data from the chart, while enhancing bottom contoursfor depth recognition.Fish Eye 3D—an underwater view that visually represents the sea floor according to thechart’s information.The unit automatically shows relevant navigational data when you select a navigation option..Using the Navigation ChartUse the Navigation Chart to plan your course, view map information, and as a navigational aid.To access the Navigation Chart, from the Home screen, select Charts > Navigation Chart.Navigation Chart with BlueChart g2 Vision DataBuoyBeaconYour boatExposedwreckMarineservicesZoom scaleSubmergedwreckZooming In and out on the MapThe RANGE (+/-) keys (GPSMAP 4008/4012) or the and keys (GPSMAP 5008/5012)control the zoom level, indicated by the scale at the bottom of the navigation chart ( ). Thebar under the number represents that distance on the map.navigation chart SettingsTo access additional settings or options for the Navigation chart, press or touch MENU.Overlay Numbers—show or hide cruising, navigation, fishing and sailing numbers on the screen.Chart Setup—customize the Navigation chart.understanding chart DataBlueChart g2 and BlueChart g2 Vision charts use graphic symbols to denote map features, whichfollow the standards for US and international charts.Other features common to most charts include depth contour lines (with deep water represented inwhite), intertidal zones, spot soundings (as depicted on the original paper chart), navigational aidsand symbols, and obstructions and cable areas.••••