Garmin GPSMAP 496 User Manual Page 136
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128 GPSMAP 496 Owner’s Manual
settIng uP And usIng sonAr > understAndIng sonAr
Transducer Coverage
The area covered by the transmitted sound waves is determined
by the cone angle of the transducer and the water depth. The wide
cone angles (40°) associated with low frequencies (50 kHz) provide
a large coverage area for nding sh within a coverage width that
is approximately 2/3 of the water depth. However, this also means
that wide cone angles produce less bottom detail and resolution. As
shown in the drawing on the near right, the 40° cone angle produces
a coverage area of approximately a 20-foot diameter circle at a
30-foot depth.
The narrow cone angles (10°) associated with the high frequencies
(200 kHz) provide better bottom resolution and crisper detail, but
cannot show a large coverage area for nding sh. The 10° cone
angle provides a coverage width that is approximately 1/5 of the
water depth. As shown in the drawing on the far right, the 10° cone
angle produces a coverage area of approximately a 6-foot diameter
circle at a 30-foot depth.
Dual frequency mode combines both frequencies to get the best
coverage area and contour/depth readings.
40° Cone Angle (50 kHz)
Coverage
diameter
Depth
10° Cone Angle (200 kHz)
Coverage
diameter
Depth
- Owner’s Manual 1
- IntroductIon 3
- Table of Contents 4
- Warnings 6
- Battery Warnings 7
- Important Information 7
- Care Information 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
- GPSMAP 496 Owner’s Manual 9 17
- On-Screen Button 17
- GPSMAP 496 Databases 18
- MapSource Detailed Maps 18
- Simulator Mode 19
- Entering a New Location 20
- Aviation Mode Page Sequence 21
- Creating a Direct To 22
- Go To Page: Recent Tab 23
- Airport Tab of Details Page 24
- Usage Restrictions Page 24
- Finding a Nearby Point 25
- Information Page for a VOR 26
- ARTCC Tab 27
- Nearest Pages: Airspace Tab 28
- Setting Airport Criteria 29
- Selecting an Approach 30
- Understanding Vectors 31
- Finding Points on Land 32
- Marking a Waypoint 33
- Following your Flight Plan 35
- Map Page 36
- Map Orientation 37
- Selecting Map Ranges 37
- Panning the Map 38
- Smart Airspace 39
- Airspace Information 39
- Measuring Distance 40
- Setting the Bug Indicator 41
- Setting Up the Map Page 41
- Changing a Data Field 42
- Additional Map Data 43
- Terrain Page 44
- Terrain Warning 45
- Shown on the Panel Page 45
- Terrain Page Options Menu 45
- Terrain Setup Page 46
- Panel Page 47
- Setting Up the Panel Page 48
- Manually Setting a Course 48
- VNAV (Vertical Navigation) 49
- Active Route Page 51
- Position Data Page 52
- Flight Log 53
- Aircraft Information 54
- Weight & Balance Tab 55
- To calculate winds aloft: 57
- Automotive Mode Page Sequence 58
- Navigating in Automotive Mode 59
- Waypoint Page 60
- Finding an Item 61
- Recently Found Items 62
- Viewing the Information Page 63
- Find Menu Options 63
- Creating Routes 64
- Creating Waypoints 66
- Map Feature Information Page 67
- Following an Automotive Route 69
- Editing Your Route 70
- Creating a Detour 71
- Highway Page 73
- Highway Page Options 74
- Current Route Page 75
- Trip Computer 76
- Editing and Managing Routes 77
- Navigating a Saved Route 78
- Editing a Route 78
- To add points to the route: 79
- To edit the route on the map: 80
- Waypoint Review Page 81
- Points Tab in the Main Menu 81
- Name eldSymbol eld 82
- Adding a Waypoint to a Route 83
- Projecting a Waypoint 84
- Managing Points 86
- User Points Tab 86
- Deleting Waypoints 87
- Proximity Points 88
- To add a proximity waypoint: 89
- Managing Your Tracks 90
- To clear the track log: 91
- To save the entire track log: 91
- Saved Sub Tab 92
- Navigating a Saved Track 93
- TracBack Tips 93
- Marine Mode Page Sequence 94
- Navigating in Marine Mode 95
- Compass Page 97
- Using the Marine Timer 98
- DSC Page 99
- Understanding Distress Calls 100
- Receiving DSC Calls 100
- DSC Call List 101
- Setting up DSC 103
- MaIn Menu 104
- Track Tab 105
- Route Tab 105
- Points Tab 105
- Sonar Tab 106
- Aircraft Tab 106
- Alarms Tab 107
- MAIn Menu > AlArMs tAb 108
- System Alarms Sub Tab 109
- Celestial Tab 110
- Tide Sub Tab 111
- AIn Menu > celestIAl tAb 112
- Hunt & Fish Sub Tab 113
- Message Tab 114
- Display Tab 115
- Sound Tab 116
- Setup Tab 117
- VNAV Sub Tab 118
- Road Routing Sub Tab 118
- Guidance Sub Tab 119
- Timers Sub Tab 120
- Time Sub Tab 121
- Units Sub Tab 121
- Location Sub Tab 122
- Welcome Sub Tab 123
- Interface Sub Tab 123
- MAIn Menu > setuP tAb 124
- AIn Menu > setuP tAb 125
- Advanced NMEA Output Setup 126
- SettInG up and uSInG Sonar 127
- Using the Sonar Page 128
- Adjusting the Sonar Page 129
- Resizing the Split Screen 131
- Setting Up the Sonar Page 132
- Calibrating the Water Speed 133
- Setting Up the Sonar Display 134
- 20' 135
- 10' 135
- Transducer Coverage 136
- Whiteline 137
- Thermoclines 137
- Reset the Temperature Graph 138
- Specications 140
- Optional Accessories 141
- Installation Information 142
- USB cable to the computer 143
- Interfacing 145
- Removing the GPS Antenna 146
- Learning About GPS 147
- LORAN TD Setup 148
- What are Map Datums? 150
- What is a Location Format? 150
- Jeppesen Database Information 152
- Messages 153
- PPendIx > MessAges 154
- Data Field Options 155
- Software License Agreement 157
- Product Registration 157
- Contact Garmin 157
- Limited Warranty 158
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