Garmin GPSMAP 188C Sounder Manuel d'utilisateur Page 97
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GPSMAP 188/188C Sounder Owner’s Manual 91
USING SONAR > UNDERSTANDING SONAR
Whiteline
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 188/188C Sounder 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 transducer to see through thermoclines and locate fish.
Thermocline
- 188/188C Sounder 1
- INTRODUCTION 3
- Table of Contents 4
- Care Information 6
- BASIC OPERATION 7
- Simulator Mode 9
- Adjusting the Backlight 10
- Interface Keys 11
- On-Screen Buttons 12
- Using the Map Pointer 13
- Creating and Using Waypoints 14
- Man OverBoard (MOB) 16
- To change the waypoint name: 17
- Navigating to a Destination 18
- Selecting a Go To Graphically 19
- 2. Press NAV 20
- . When the track is 21
- BASIC OPERATION > ROUTES 23
- Review Page: 24
- By Name or Nearest tab list 25
- You can also Find 26
- Additional Information 27
- Understanding Distress Calls 28
- Receiving DSC Calls 29
- New Directory Item Page 30
- Setting up DSC 31
- MAIN PAGES 32
- Map Page 33
- Selecting Map Ranges 35
- Map Page Options 36
- MAIN PAGES > MAP PAGE 37
- Pointer Page 39
- Numbers Page 40
- Highway Page 41
- Highway Page Options 42
- Active Route Page 43
- Active Route Page Options 44
- MAIN MENU 45
- WAAS Capability 46
- MAIN MENU > GPS TAB 47
- Tide Tab 49
- MAIN MENU > TIDE TAB 50
- AIN MENU > TIDE TAB 51
- Trip Tab 52
- Celes (Celestial) Tab 53
- Points Tab 54
- User Waypoint List 55
- AIN MENU > POINTS TAB 56
- Proximity Waypoint List 57
- Routes Tab 59
- Route Review Page 60
- Route Review Menu Options 61
- AIN MENU > ROUTES TAB 62
- Route Pages 63
- To delete a route: 64
- Track Tab 65
- MAIN MENU > TRACK TAB 66
- AIN MENU > DSC TAB 67
- Card Tab 68
- Time Tab 68
- Pages Tab 69
- General Sub Tab 70
- Source Sub Tab 70
- Waypoints Sub Tab 71
- Points Sub Tab 72
- Nav Line Sub Tab 73
- Hiway (Highway) Tab 74
- Temp (Temperature) Tab 74
- Sonar Tab 74
- Systm (System) Tab 75
- Units Tab 76
- Manually enter a 77
- Comm (Communications) Tab 78
- AIN MENU > COMM TAB 79
- Advanced NMEA Output 80
- Setup Page 80
- Distance shows 81
- Status Field 81
- SNR and 81
- Alarm Tab 82
- To set an alarm: 83
- USING SONAR 84
- Using the Adjustment Menu 85
- USING SONAR > SONAR PAGE 86
- Sonar Page Options 89
- Sonar Tab Options 91
- Depth Scale (Overlay) 92
- Color Bar 92
- Keel Offset: 93
- Transducer 93
- To calibrate the water speed: 94
- 20' 95
- 10' 95
- Transducer Coverage 96
- Whiteline 97
- Thermoclines 97
- APPENDIX 98
- Mounting the GPS Antenna 99
- Using the Gimbal Mount 100
- (GPSMAP 188C Shown) 101
- Installing the Transducer 102
- Transom Mount Transducer 103
- 104
- Interfacing 105
- Satellite Information 107
- What is WAAS? 108
- APPENDIX > WHAT IS MMSI? 109
- Navigation Terms 110
- PPENDIX > NAVIGATION TERMS 111
- Messages 112
- APPENDIX > MESSAGES 113
- LORAN TD System 114
- Loran TD Setup Page 115
- Optional Accessories 116
- Software License Agreement 117
- Product Registration 117
- Limited Warranty 118
- FCC Compliance 119
- Safety Information 120
- 190-00585-00 Rev. A 126
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