GPSMAP® 585 Plus 23Mariner’s Eye 3D: Shows a detailed, three-dimensional view from aboveand behind the boat (according to your course) and provides a visualnavigation aid. This view is helpful when navigating tricky shoals, reefs,bridges, or channels, and when trying to identify entry and exit routes inunfamiliar harbors or anchorages.NOTE: Mariner’s Eye 3D and Fish Eye 3D chart views are available withpremium charts, in some areas.Fish Eye 3D: Provides an underwater view that visually represents thesea floor according to the chart information. When a sonar transducer isconnected, suspended targets (such as fish) are indicated by red, green,and yellow spheres. Red indicates the largest targets and green indicatesthe smallest.Fishing Chart: Provides a detailed view of the bottom contours and depthsoundings on the chart. This chart removes navigational data from thechart, provides detailed bathymetric data, and enhances bottom contoursfor depth recognition. This chart is best for offshore deep-sea fishing.Navigation Chart and Offshore Fishing ChartThe Navigation and Fishing charts allow you to plan your course, view mapinformation, and follow a route.The Fishing chart is for offshore fishing.Before you can open the navigation chart, you must add it to your homescreen (page 5). To open the Navigation chart, select Navigation Chart.Chart SymbolsThis table contains some of the common symbols you might see on thedetailed charts.Icon DescriptionBuoyInformationMarine servicesTide stationCurrent stationOverhead photo availablePerspective photo availableOther features common to most charts include depth contour lines, intertidalzones, spot soundings (as depicted on the original paper chart), navigational