GPSMAP 3205 Owner’s Manual IntroductIon > table of contentsMap Page ....................................................................................................... 34Using the Map Pointer ............................................................................................35Selecting Map Ranges ............................................................................................36Cartography ............................................................................................................36Map Page Options ..................................................................................................37Map Split Page .............................................................................................. 39Compass Page .............................................................................................. 393D Highway Page ......................................................................................... 40Changing the Highway Perspective Range ............................................................41Main Menu .............................................................................................. 42GPS Tab ......................................................................................................... 42Tide Tab ......................................................................................................... 43Tide Sub Tab ...........................................................................................................43Current Sub Tab ......................................................................................................45Celestial Tab.................................................................................................. 46Trip Tab .......................................................................................................... 47Weather Tab .................................................................................................. 48Points Tab ..................................................................................................... 48Routes Tab .................................................................................................... 49Tracks Tab ..................................................................................................... 50DSC (Digital Selective Calling) Tab ............................................................. 51Understanding DSC Distress Calls .........................................................................52Understanding Position Reports .............................................................................52Review DSC Waypoint ...........................................................................................52Setting Up DSC ......................................................................................................53Using the NAV Key ................................................................................................53Card Tab ........................................................................................................ 54Messages Tab ............................................................................................... 55Viewing Detailed Message Information .................................................................55Alarms Tab .................................................................................................... 56System Alarms ........................................................................................................56Nav (Navigation) Alarms........................................................................................57Sonar Alarms ..........................................................................................................57Weather Alarms ......................................................................................................57System Tab.................................................................................................... 58Update Sub Tab.......................................................................................................63Network Tab .................................................................................................. 63Pages Tab ...................................................................................................... 64Map Tab ......................................................................................................... 65AIS Sub Tab ............................................................................................................68Sonar Tab ...................................................................................................... 69Highway Tab.................................................................................................. 70XM Tab ........................................................................................................... 70Using Favorites .......................................................................................................71Using Sonar ........................................................................................... 72Understanding Sonar ................................................................................... 72Using Dual Frequency ............................................................................................72Using Dual Beam....................................................................................................72Understanding the Sonar Display ...........................................................................73Sonar Page .................................................................................................... 74Configuring the Sonar Page ....................................................................................75Using the Sonar Adjustment Menu .........................................................................75Using the Pointer on the Sonar Page ......................................................................77Marking an Underwater Waypoint .........................................................................77Sonar Tab ...................................................................................................... 77General Sub Tab......................................................................................................78Graph Sub Tab ........................................................................................................79Water Temp Sub Tab ...............................................................................................80