Garmin GPSMAP 178C Sounder Manual de usuario Pagina 107
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97
Selecting a Transducer
Appendix A
Transducers
The transducer acts as the eyes and ears of your new sonar. Proper transducer selection and installa-
tion are critical to the operation of your unit. The transducer transmits sound waves toward the bottom
in a cone shape. The larger the cone angle, the larger the coverage area at a given depth.
A wide cone angle transducer works best in shallow water. The wide cone angle provides a large
coverage area, but at a decreased bottom resolution. In deeper water this can result in a large dead zone
where fish cannot be seen. A narrow cone angle transducer is better suited to deep-water installations.
The narrow cone angle provides a smaller viewing area (compared to a wide cone angle transducer at the
same depth) with improved bottom resolution and a smaller dead zone. Dual frequency transducers give
you the best of both wide and narrow cone angles.
The GPSMAP 178/178C is packaged with and without a transducer. Depending on which transducer
you select, you will have either single or dual frequency performance. Since many mounting locations
vary, there are a variety of standard and optional transducers, and accessories which are available. See
your local Garmin dealer or contact Garmin to help you in your selection of optional transducers and
accessories.
X
X
dead zone
fish not seen
Wide cone angle
Narrow cone angle
(red) + 10-35 VDC
(black) - Ground (Power/Data)
(blue) Port 1 Data OUT
(brown) Port 1 Data IN
(white) Port 2 Data IN
(green) Port 2 Data OUT
(yellow) Alarm Low
To Transducer
To Unit
Beacon
Receiver or
DSC VHF
Autopilot/
NMEA Device
DC �
Power Source
RXD +
RXD -
RX+
TX+
Alarm Relay
100ma max
coil current
- GPSMAP 178/178C 1
- Preface/Registration/ 3
- Software License Agreement 3
- FCC Compliance 4
- Warnings and Cautions 5
- Warranty and 6
- Serial Number 6
- Capabilities 7
- Packing List 8
- Table of Contents 9
- Introduction 10
- “How To” Index 10
- Getting Started 11
- Keypad Usage 11
- Selecting Options 12
- Entering Data 13
- Initializing the Receiver/ 14
- Power On 14
- Initializing the Receiver 15
- Tour/Backlighting 16
- Simulator Mode 17
- Main Pages/ 18
- Map Page 18
- Using the Map Cursor 19
- Marking Waypoints 20
- Using the NAV Key 21
- Simulated Tour 22
- Reviewing/Creating 23
- Map Waypoints 23
- Map/Sonar Split & 24
- Sonar Pages 24
- Sonar Page 25
- Compass Page 26
- Highway Page 27
- Changing Data Fields/ 29
- Active Route Page 29
- Main Menu Page/ 30
- Deleting Waypoints 30
- Powering Off Unit 31
- Map Page: Cursor 33
- Map Page: Options 35
- Map Page Options 36
- Map/Sonar Split Page 42
- Using the Adjustment Menu 43
- Sonar Page: 44
- Adjustment Menu 44
- Sonar Page Options 46
- Sonar Tab Options 48
- Highway Page Options 53
- Marking Your Present Position 54
- Creating Waypoints 55
- Waypoint Menu Options 57
- Reviewing/Editing Waypoints 58
- Editing Waypoints 59
- User Waypoint List 60
- Proximity Waypoint List 61
- Waypoint Lists 62
- Going to a Destination 63
- Going to a Destination/ 64
- TracBack Navigation 64
- TracBack Navigation/ 66
- MOB: Man OverBoard 66
- Creating a Route 67
- Creating a Route/ 68
- Following a Route 68
- Route List Page 69
- Route Review Options Menu 70
- Editing Routes 71
- Active Route Page Options 74
- Find Key 75
- Find Options 76
- Main Menu Page 77
- Main Menu: GPS Tab 78
- WAAS Capability 79
- Receiver Status and Accuracy 79
- Main Menu: Tide Tab 83
- Main Menu: Trip Tab/ 84
- Celestial Tab 84
- Main Menu: Track Tab 85
- Main Menu: DSC Tab 87
- DSC Distress Call 89
- DSC Position Report 89
- DSC Call List 90
- DSC Entry Review 90
- DSC Directory 90
- DSC Setup 91
- Main Menu: Temp Tab/ 93
- Setup Tab 93
- Main Menu: System Tab/ 94
- Units Tab 94
- Main Menu: Units Tab 95
- Main Menu: Time/ 96
- Comm Tab 96
- Main Menu: Comm Tab 97
- NMEA Interface 99
- Advanced NMEA Output Setup 99
- Reference 100
- Main Menu: Comm Tab/ 100
- Alarm Tab 100
- Main Menu: Alarm Tab 101
- Appendix A 102
- Antenna Installation 102
- Unit Installation 103
- Wiring and Interfacing 106
- Selecting a Transducer 107
- Mounting the Transducer 108
- Testing the Installation 110
- Installing and Removing 111
- Data Cards 111
- Appendix B 112
- Loran TD 112
- Loran TD Setup 113
- Appendix C 114
- Map Datums 114
- Appendix D 116
- Messages 116
- Appendix E 118
- Navigation Terms 118
- Time Offsets 120
- Appendix F 120
- Appendix G 121
- Understanding Sonar 121
- Transducer Coverage 122
- Understanding the Chart 123
- Understanding the Graph 124
- Appendix H 126
- Specifications 126
- Specifications/ 127
- Unit Care 127
- Keypad 1, 2 129
- Appendix I 131
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