Garmin GPSMAP 496 User Manual Page 153
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Whiteline
The GSD 20 or GSD 21 Sounder Module can help you determine
whether the bottom is hard or soft. When the sonar sound waves are
reflected back by the bottom, a hard bottom returns a stronger signal
than a soft bottom. A thin whiteline indicates a softer bottom, while
a thick whiteline indicates a harder bottom. Normally, a red line
is used to show the point where water meets the bottom. This line
follows the bottom contour, along with any significant objects lying
on the bottom. The unit uses the whiteline function to make the
bottom layer information easier to distinguish.
Whiteline OffWhiteline On
Thick
Whiteline: Hard
bottom
Thermoclines
A rough definition of a thermocline is a break in water where
the water temperature changes faster than the water above it.
Thermoclines are shown as the weakest colors.
One of the unique features offered by Garmin is See-Thru
®
technology, which allows the GPSMAP 496 to hear both weak and
strong signals simultaneously so as to identify fish returns under
the toughest conditions, such as suspended in thermoclines or even
hiding near structures. See-Thru technology allows the GSD 20 or
GSD 21 Sounder Module to see through thermoclines and helps
locate fish where they live.
Thermocline
GPSMAP 496 Owner’s Manual 145
SETTING UP AND USING SONAR > UNDERSTANDING SONAR
- Owner’s Manual 1
- INTRODUCTION 3
- Table of Contents 4
- INTRODUCTION > WARNING 7
- INTRODUCTION > CAUTION 8
- GETTING STARTED 9
- Charging the GPSMAP 496 10
- Turning On the GPSMAP 496 11
- Getting Satellite Signals 12
- Receiver Status 13
- GPS Tab Options 14
- GPS Tips 14
- Learning About the Keypad 15
- Using the GPSMAP 496 16
- 2. Press ENTER 17
- GPSMAP 496 Databases 18
- MapSource Detailed Maps 18
- Starting Simulator Mode 19
- GPSMAP 496 Owner’s Manual 11 19
- Entering a New Location 20
- AVIATION 21
- AVIATION MODE PAGES 37
- Map Orientation 38
- Selecting Map Ranges 38
- Setting the Bug Indicator 42
- Setting Up the Map Page 42
- Setting Up the Panel Page 49
- Manually Setting a Course 49
- VNAV (Vertical Navigation) 50
- Turning on the XM Audio Page 59
- XM Audio Page Options 60
- Using Favorites 61
- Scanning XM Radio Channels 62
- Turning Audio On or Off 62
- AUTOMOTIVE 63
- Marine Mode Page Sequence 99
- Navigating in Marine Mode 100
- Map Page 101
- Compass Page 102
- Using the Marine Timer 103
- DSC Page 104
- Understanding Distress Calls 105
- Receiving DSC Calls 105
- DSC Call List 106
- DSC Directory 107
- Setting up DSC 108
- DSC Setup 108
- GPS Page 109
- MAIN MENU > GPS TAB 109
- Audio Sub Tab 110
- XM Tab Audio Sub Tab 110
- Flights Tab 111
- Route Tab 111
- User Sub Tab 112
- Proximity Sub Tab 112
- Active Sub Tab 112
- Saved Sub Tab 112
- Sonar Tab 113
- Aircraft Tab 113
- Alarms Tab 114
- System Alarms Sub Tab 115
- Weather Alarms Sub Tab 116
- Celestial Tab 117
- Tide Sub Tab 118
- AIN MENU > CELESTIAL TAB 119
- Hunt & Fish Sub Tab 120
- Message Tab 121
- Display Tab 122
- Sound Tab 123
- System Sub Tab 124
- VNAV Sub Tab 124
- Road Routing Sub Tab 125
- Guidance Sub Tab 126
- Timers Sub Tab 127
- Units Sub Tab 128
- Location Format Sub Tab 128
- Map Datum Sub Tab 128
- Welcome Sub Tab 129
- Interface Sub Tab 130
- MAIN MENU > SETUP TAB 131
- AIN MENU > SETUP TAB 132
- Advanced NMEA Output Setup 133
- USING XM WX WEATHER 134
- Setting XM WX Weather Options 135
- Weather Explorer Tab 136
- Avtn Wx Tab 136
- Srfc Wx Tab 137
- Mrn Wx Tab 137
- Using the Weather Tab 138
- Weather Options 139
- Information Sub Tab 140
- Finding Weather Information 141
- Marine Weather Bulletins 142
- Marine Weather Bulletin 142
- SETTING UP AND USING SONAR 143
- Using the Sonar Page 144
- Adjusting the Sonar Page 145
- Resizing the Split Screen 147
- Setting Up the Sonar Page 148
- Calibrating the Water Speed 149
- Setting Up the Sonar Display 150
- 20' 151
- 10' 151
- Transducer Coverage 152
- Whiteline 153
- Thermoclines 153
- Reset the Temperature Graph 154
- 3,500 ft 155
- 3,000 ft 155
- TIS Limitations 156
- TIS > TIS LIMITATIONS 157
- TIS Symbology 158
- Traffic Ground Track 159
- Traffic Warning Window 159
- Intruder Aircraft 161
- + 500 ft 161
- This area within 34 seconds 161
- - 500 ft 161
- VHF COMM 162
- Physical Specifications 163
- Performance 163
- Accuracy 163
- Cleaning the Unit 164
- Storing the GPSMAP 496 164
- Immersing the Unit in Water 164
- Optional Accessories 165
- Installation Information 166
- GXM 30A Antenna Plugged In 167
- Interfacing 170
- Removing the GPS Antenna 170
- Common GPS Terms 171
- Differential Field 171
- What is WAAS/EGNOS? 172
- LORAN TD Feature 173
- Using the LORAN TD Format 173
- APPENDIX > LORAN TD SETUP 174
- What are Map Datums? 175
- What is a Location Format? 175
- Database Updates 178
- Messages 179
- APPENDIX > MESSAGES 180
- Data Field Options 182
- Software License Agreement 184
- Contact Garmin 184
- Limited Warranty 185
- AOPA Airport Directory Notice 186
- Weather Data Warranty 186
- FCC Compliance 188
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