Furuno GP-1870F - Page 106

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7. FISH FINDER OPERATIONS

7-26

False echo

When an ultrasonic pulse is transmitted, some energy leaves from each side of the

beam. This energy has the name "sidelobe". Echoes from sidelobes show on the

screen as false images like in the illustration shown below.

MainlobeMainlobe

SidelobeSidelobe

False image

Table of Contents

Default Chapter4
- Safety Instructions4
- Table of Contents6
Foreword11
System Configuration13
Equipment Lists14
1 Operational Overview17
- Controls17
  - Control Description17
- Rotokeytm and Soft Controls21
- How to Turn the Power on or off22
- How to Adjust the Display Brilliance22
- 2D Plotter Displays22
- The Cursor25
- Navigation Data Boxes26
- Display Width34
- Orientation Mode34
- How to Move the Chart35
- Menu Operation36
- Object Information37
  - Simple Information37
  - Detailed Information37
- Context-Sensitive Menus38
- Man Overboard (MOB)41
- How to Take a Screenshot41
- Tide Information42
  - Tide Height Information42
  - Tide Stream Information43
2 Track45
- How to Show, Hide All Track45
- How to Start, Stop Recording Track45
- How to Select Recording Method, Recording In-Terval45
- How to Change the Color of Your Boat's Track46
- How to Change the Color of Your Boat's Track with Sea Surface Temperature46
- How to Hide, Show Track by Color46
- How to Delete Track by Color47
- How to Find Track Information47
- How to Find Number of Track Points Used48
3 Points49
- What Is a Point49
- How to Enter a Point49
- How to Find Detailed Point Information52
- How to Move a Point52
  - How to Move a Point on the Screen52
  - How to Move a Point from the Points List52
- How to Select Visibility for Points53
- How to Search, Sort Points on the Points List53
  - How to Search Points53
  - How to Sort Points53
- How to Filter Points by Shape on the Points List54
- How to Delete Points54
  - How to Delete a Point from the Screen54
  - How to Delete Points from the Points List54
4 Routes55
- What Is a Route55
- How to Create a Route55
- How to Extend a Route on the Screen60
- How to Insert a Point on a Route on the Screen61
- How to Move a Point in a Route on the Screen61
- How to Delete a Point from a Route on the Screen61
- Routes List62
  - How to Display the Routes List62
  - Functions Available in the Routes List63
- Route Report, Route Calculator64
- How to Display a Route on the Screen65
- How to Connect Two Routes65
- Simple Route Information65
- How to Rename a Route on the Screen66
- How to Delete Routes66
  - How to Delete a Route on the Screen66
  - How to Delete Routes from the Routes List66
5 Navigation67
- How to Navigate to a Quick Point67
- How to Navigate to a Saved Point68
  - How to Navigate to a Saved Point Selected on the Screen68
  - How to Navigate to a Point Selected from the Points List68
- How to Select a Route for Navigation68
- Functions Available When You Follow a Route70
6 Map Settings, 2D Perspective/3D Displays and Satellite Overlay73
- Map Setup73
- Perspective Display77
- Display78
- Satellite Photo Overlay80
7 Fish Finder Operations81
- How the Fish Finder Works81
- Fish Finder Display82
- How to Activate the Fish Finder83
- How to Start, Stop Transmission83
- How to Select a Display83
- Automatic Fish Finder88
- Manual Fish Finder Operation89
- Picture Advance Speed91
- How to Reduce Interference92
- How to Erase Weak Echoes92
- How to Measure Depth, Time between Locations93
- How to Balance Echo Strength93
- White Marker94
- White Line94
- Alarms94
  - How to Set an Alarm95
  - How to Select the Echo Signal Level that Triggers the Fish Alarm95
- Accu-Fishtm96
- Water Temperature Graph98
- FISH FINDER Menu99
- Interpreting the Display102
8 Alarms107
- ALARMS Menu107
- Audio Alarm Conditions108
- Arrival Alarm108
- XTE Alarm109
- Temperature Alarm109
- Shear Alarm110
- Depth Alarm110
- Anchor Alarm111
- Trip Alarm111
- Speed Alarm111
- Fuel Tank Alarm112
- Water Tank Alarm112
- Black Water Tank Alarm112
9 Memory Card Operations113
- The Memory Card Screen113
- How to Initialize SD Cards113
- How to Eject an SD Card114
- How to Save Data to an SD Card114
- How to Rename Files on an SD Card114
- How to Delete Files from an SD Card115
  - How to Delete Individual Files from an SD Card115
  - How to Delete All Files from an SD Card115
- How to Import Data from an SD Card115
- How to Process Screenshots116
10 Other Functions119
- AIS Operations119
- AIS SART Operations121
- DSC Message Information122
  - How to Select a Device for DSC Message Information122
- Stopwatch, Timer123
- How to Select Input, Output Data124
  - Input Data124
  - Output Data125
- Engine Display Setup (INSTRUMENTS Menu)126
- Wireless LAN Setup127
  - How to Connect to a Wireless LAN127
- How to Output the Display to an Ios Device129
- C-Weather130
11 Customizing Your Unit137
- GENERAL Menu137
- PLOTTER Menu138
- SYSTEM Menu139
12 Maintenance, Troubleshooting143
- 12. Maintenance143
- How to Replace the Fuse144
- Troubleshooting144
- GPS Status Display146
- How to Restore Defaults, Clear Memory147
- System Information148
13 Installation149
- Installation of Display Unit149
- Installation of Antenna Unit150
- Installation or Transducers150
- Installation of Sensors (Option)161
  - Speed/Temperature Sensors ST-02MSB, ST-02PSB161
- Wiring162
- Initial Settings166
Appendix 1 Menu Tree173
Appendix 2 Abbreviations, Symbols180
Appendix 3 Jis Cable Guide186
Appendix 4 Installation of Temperature Sensors187
Specifications192
Index202

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