GPSMAP 3205 Owner’s ManualM aIn Menu > M aP tab• 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) provides area traffic situational awareness.AIS provides ship IDs, position, course, and speed for ships equipped with atransponder within range.NOTE: You must set your chartplotter communication to NMEA In/NMEAOut with a baud rate of 38,400 to receive AIS information.The AIS sub tab contains the following options:• AIS Vessels—sets the maximum zoom scale at which AIS vessels appearon-screen. Select Off, Auto, All Ranges, or <30 ft to <800 nm.• heading line—draws an extension from the end of the boat icon in thedirection of travel. For Time, enter the numeric time value for which youwant the line to extend. The Time line length automatically adjusts as yourspeed changes.Source Sub TabUse the Source sub tab to turn basemaps and card maps on or off.The Source sub tab contains the following options:• Basemap—turns the built-in basemap on or off.• Card Maps—turns all optional BlueChart g2 or MapSource data loaded onthe data card on or off.