GPSMAP 4000 Series Owner’s Manual 3Using ChartsUSinGChartSSurface Radar—display radar returns from the surface of the water when the chartplotter isconnected to a marine radar (page 44).Perspective 3D With Surface Radar InformationData Bars—show or hide cruising, navigation, fishing, fuel, or sailing numbers (page 10).Chart Appearance—customize the Perspective 3D chart.Range Rings—toggles the range rings on or off. The range rings help you to visualize distanceson the map.Safe Depth—adjusts the safe depth for your boat. If the chartplotter is connected to an optionalsonar module and the shallow water alarm is activated (page 71), an alarm will sound when yourboat enters water shallower than this setting.Lane Width—adjusts the width of the course line drawn when navigating. This setting alsoaffects routes (Route To), but does not affect automatic guidance (Guide To).Using Radar OverlayWhen you connect your chartplotter to an optional Garmin marine radar, you can use Radar Overlayto overlay radar information on the Navigation chart (page 44).Using TracksA track is a recording of your path. The track currently being recorded is the active track. You cansave an active track.To turn the track log on:From the Navigation or Perspective 3D chart, select Menu > Waypoints & Tracks > Tracks >On. A trailing line on the chart indicates your track.•••
