GPSMAP 3206/3210 Owner’s Manual IntroductIon > table of contentsMap Split Page .............................................................................................. 41Compass Page .............................................................................................. 41Highway Page ............................................................................................... 42Changing the Highway Perspective Range ............................................................43Highway Page Options ...........................................................................................43Video Page .................................................................................................... 44Video Page Options ................................................................................................44Main Menu .............................................................................................. 45GPS Tab ......................................................................................................... 45Tide Tab ......................................................................................................... 46Tide Sub Tab ...........................................................................................................46Current Sub Tab ......................................................................................................48Celestial Tab.................................................................................................. 49Trip Tab .......................................................................................................... 50Weather Tab .................................................................................................. 51Points Tab ..................................................................................................... 51Routes Tab .................................................................................................... 52Tracks Tab ..................................................................................................... 53DSC (Digital Selective Calling) Tab ............................................................. 54Understanding DSC Distress Calls .........................................................................55Understanding Position Reports .............................................................................55Review DSC Waypoint ...........................................................................................55Setting Up DSC ......................................................................................................56Using the NAV Key ................................................................................................56Card Tab ........................................................................................................ 57Messages Tab ............................................................................................... 58Viewing Detailed Message Information .................................................................58Alarms Tab .................................................................................................... 58System Alarms ........................................................................................................59Nav (Navigation) Alarms........................................................................................59Sonar Alarms ..........................................................................................................59Weather Alarms ......................................................................................................60System Tab.................................................................................................... 60Update Sub Tab.......................................................................................................65Network Tab .................................................................................................. 66Pages Tab ...................................................................................................... 66Map Tab ......................................................................................................... 67AIS Sub Tab ............................................................................................................70Radar Tab ...................................................................................................... 72Temp (Temperature) Tab .............................................................................. 72Sonar Tab ...................................................................................................... 73Highway Tab.................................................................................................. 73XM Tab ........................................................................................................... 74Using Sonar ........................................................................................... 76Understanding Sonar ................................................................................... 76Using Dual Frequency ............................................................................................76Using Dual Beam....................................................................................................76Understanding the Sonar Display ...........................................................................77Sonar Page .................................................................................................... 78Configuring the Sonar Page ....................................................................................79Using the Sonar Adjustment Menu .........................................................................80Using the Pointer on the Sonar Page ......................................................................82Marking an Underwater Waypoint .........................................................................82Sonar Tab ...................................................................................................... 82General Sub Tab......................................................................................................83Graph Sub Tab ........................................................................................................84Water Temp Sub Tab ...............................................................................................85