68 GPSMAP 2206/2210 Owner’s ManualM AIN MENU > M AP TABNav Sub TabUse the Nav sub tab to show or hide certain navigational features on the MapPage and the scale at which they appear.The Nav sub tab contains the following options:• AutoZoom—toggles the automatic zoom on or off. When On, the mapautomatically adjusts the map to a lower range as you approach yourdestination point.• Accuracy Circle—toggles the circle on or off. The circle represents theapproximate accuracy of the GPS position based on EPE (EstimatedPosition Error) and map data quality. Your actual location is somewherewithin the circle.• Bearing Line—sets the maximum scale at which the feature appears on thescreen and toggles the red/yellow line that continually points to the currentnavigation point. Select Off, All Ranges, Auto, or <30 ft to <800 nm.• Course Line—sets the maximum zoom scale at which the course lineappears on-screen. Select Auto, Off, or <120 ft to <800 nm.• Heading Line—draws an extension from the end of the boat icon in thedirection of travel. For Distance, enter the numeric distance value to whichyou want the line to extend. For Time, enter the numeric time value forwhich you want the line to extend. The Time line length automaticallyadjusts as your speed changes.AIS Sub TabAIS (Automatic Identification System) alerts you to area traffic. AIS providesship IDs, position, course, and speed for ships equipped with a transponder withinrange.NOTE: You must set your chartplotter communication to NMEA In/NMEAOut with a baud rate of 38,400 to receive AIS information.