GPSMAP 2206/2210 Owner’s Manual iiiINTRODUCTION > TABLE OF CONTENTSMap Split Page .............................................................................................. 39Compass Page .............................................................................................. 40Highway Page ............................................................................................... 41Changing the Highway Perspective Range ............................................................41Highway Page Options ...........................................................................................41Showing or Hiding Cartography.............................................................................42Main Menu .............................................................................................. 43GPS Tab ......................................................................................................... 43Tide Tab ......................................................................................................... 44Tide Sub Tab ...........................................................................................................44Current Sub Tab ......................................................................................................46Celestial Tab ................................................................................................. 47Trip Tab .......................................................................................................... 48Points Tab ..................................................................................................... 49Routes Tab .................................................................................................... 50Tracks Tab ..................................................................................................... 50DSC (Digital Selective Calling) Tab ............................................................. 52Understanding DSC Distress Calls .........................................................................52Understanding Position Reports .............................................................................52Review DSC Waypoint ...........................................................................................53Setting Up DSC ......................................................................................................54Using the NAV Key ................................................................................................54Card Tab ........................................................................................................ 54Messages Tab ............................................................................................... 55Viewing Detailed Message Information .................................................................55Alarms Tab .................................................................................................... 56System Alarms ........................................................................................................57Nav (Navigation) Alarms........................................................................................57Sonar Alarms* ........................................................................................................58System Tab ................................................................................................... 58Update Sub Tab.......................................................................................................63Network Tab .................................................................................................. 64Pages Tab ...................................................................................................... 64Map Tab ......................................................................................................... 65AIS Sub Tab ............................................................................................................68Temp (Temperature) Tab .............................................................................. 70Sonar Tab ...................................................................................................... 71Highway Tab ................................................................................................. 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 .........................................................................76Using the Pointer on the Sonar Page ......................................................................78Marking an Underwater Waypoint .........................................................................78Sonar Tab ...................................................................................................... 78General Sub Tab .....................................................................................................79Graph Sub Tab ........................................................................................................80Water Temp Sub Tab ...............................................................................................81