Garmin GPSMAP 421/421s Owner's Manual - Page 5

Viewing Information 31 Viewing a Compass 31 Viewing Numbers 31 Viewing Trip Information 32 Viewing and Customizing Fuel Gauges and Engine Gauges..... 32 Viewing and Customizing Wind Gauges 36 Viewing Tide-station Information 37 Viewing Current Information 38 Viewing Celestial Information 38 Viewing User Data 39 Viewing Other Vessels 41 Automatic Identification System 41 Configuring the Chartplotter 47 Configuring System Settings 47 Configuring Units of Measure 47 Changing the System Language 48 Configuring Navigation Preferences 48 Configuring Communications Settings 50 Setting Alarms 52 Setting the Total Fuel Onboard Alarm 53 Configuring My Boat 53 Configuring Other Vessels 54 Introduction Using Sonar 56 Understanding the Full Screen 56 Understanding the Split Frequency Screen 57 Understanding The Split Zoom Screen 57 Understanding the Depth Log Screen 58 Understanding the Temp Log Screen 58 Setting Up Sonar 59 Advanced Sonar Settings 60 Digital Selective Calling (DSC 61 Using the Chartplotter with a VHF Radio 61 Adding a DSC Contact 62 Viewing the DSC List 62 Receiving Distress Calls 62 Man-Overboard Distress Calls Initiated from a VHF Radio........ 63 Man-Overboard Distress Calls Initiated from the Chartplotter.... 63 Position Tracking 63 Placing an Individual Routine Call 64 Calling an AIS Target 65 Appendix 66 Specifications 66 Alarms and Messages 68 Capturing Screenshots 71 Caring for the Unit 71 Software License Agreement 72 Index 73 GPSMAP 400/500 Series Owner's Manual iii