COLOR SCANNING SONAR
FSV-24
9-52 Ashihara-cho,9-52 Ashihara-cho,
A
A
*00080916503**00080916503*
*00080916503**00080916503*
*OME13180K00**OME13180K00*
Nishinomiya, JapanNishinomiya, Japan
Telephone :Telephone : 0798-65-21110798-65-2111
Telefax :Telefax : 0798-65-42000798-65-4200
ll rights reserved.
ll rights reserved.
PUB.No.PUB.No. OME-13180OME-13180
Printed in JapanPrinted in Japan
Your Local Agent/DealerYour Local Agent/Dealer
IRST EDITION :
IRST EDITION : APR.APR. 20012001
KK :: FEB.FEB. 12,200312,2003
(( HIMAHIMA ))
FSV-24FSV-24
* 0 0 0 8 0 9 1 6 5 0 3 ** 0 0 0 8 0 9 1 6 5 0 3 *
*OME13180K00**OME13180K00*
* O M E 1 3 1 8 0 K 0 ** O M E 1 3 1 8 0 K 0 *
SAFETY INSTRUCTIONS
DANGER
Keep away from moving
shaft of the hull unit.
Gears may cause injury.
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel
should work inside the
equipment.
Immediately turn off the power at the
switchboard if water leaks into the
equipment or something is dropped in
the equipment.
Continued use of the equipment can cause
fire or electrical shock. Contact a FURUNO
agent for service.
WARNING
Keep heater away from equipment.
A heater can melt the equipment's power
cord, which can cause fire or electrical
shock.
Use the proper fuse.
Fuse rating is shown on the equipment.
Use of a wrong fuse can result in equipment damage.
Do not operate the equipment with wet
hands.
Electrical shock can result.
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury can
result.
Do not place liquid-filled containers on
the top of the equipment.
Fire or electrical shock can result if a liquid
spills into the equipment.
Immediately turn off the power at the
switchboard if the equipment is emitting
smoke or fire.
Continued use of the equipment can cause
fire or electrical shock. Contact a FURUNO
agent for service.
Make sure no rain or water splash leaks
into the equipment.
Fire or electrical shock can result if water
leaks in the equipment.
i
CAUTION
Maximum speed while the transducer is
projected and being raised or lowered
is as below, to prevent damage to the
transducer.
Projected Raising/
Lowering
1200 mm stroke Max. 18 kt Max. 15 kt
1600 mm stroke Max. 15 kt Max. 12 kt
Do not use the equipment for other
than its intended purpose.
Use of the equipment as a stepping stool,
for example, may result in personal injury
or equipment damage.
A warning label is attached to the units
of the system. Do not remove the label.
If the label is missing or damaged,
contact a FURUNO agent or dealer.
WARNING
To avoid electrical shock, do not
remove cover. No user-serviceable
parts inside.
DANGER
Keep fingers away
from gears.
Shaft may cause injury.
Keep away froom
moving shaft.
Name: Warning Label (1)
Type: 86-003-1011-0
Code No.: 100-236-230
Name: Warning Label
Type:10-071-5313
Code No.: 100-291-160
ii
TABLE OF CONTENTS
FOREWORD.......................................................................................................viii
SYSTEM CONFIGURATION.................................................................................x
1.
OPERATIONAL OVERVIEW.........................................................................1-1
1.1 Control Description ............................................................................................................1-1
1.2 Turning the Power On/Off..................................................................................................1-2
1.2.1 Turning the power on ............................................................................................1-2
1.2.2 Turning the power off ............................................................................................1-2
1.3 Lowering, Raising the Transducer.....................................................................................1-3
1.3.1 Lowering the transducer........................................................................................1-3
1.3.2 Raising the transducer ..........................................................................................1-3
1.4 Screen Brilliance................................................................................................................1-3
1.5 Control Panel Dimmer........................................................................................................1-4
1.6 Display Mode, Display Division..........................................................................................1-6
1.6.1 Selecting a display mode......................................................................................1-6
1.6.2 Sample display mode pictures..............................................................................1-7
1.7 Adjusting the Gain............................................................................................................1-11
1.8 Menu Overview................................................................................................................1-12
2. HORIZONTAL MODE ....................................................................................2-1
2.1 Basic Operating Procedure................................................................................................2-1
2.2 Horizontal Mode Indications and Marks.............................................................................2-2
2.3 Display Range....................................................................................................................2-3
2.4 Tilt Angle.............................................................................................................................2-3
2.4.1 Setting the tilt angle...............................................................................................2-3
2.4.2 Automatic tilt..........................................................................................................2-4
2.4.3 Bottom echo and tilt angle.....................................................................................2-5
2.4.4 How to discriminate fish echoes from the bottom.................................................2-5
2.4.5 Tilt angle for surface fish.......................................................................................2-6
2.4.6 Suitable tilt angle...................................................................................................2-7
2.5 Finding Range and Bearing to a Target.............................................................................2-8
2.6 Eliminating Weak Echoes..................................................................................................2-8
2.7 Suppressing Bottom Tail ..................................................................................................2-11
2.7.1 AGC.....................................................................................................................2-1 1
2.7.2 By decreasing pulselength..................................................................................2-12
2.7.3 2
2.8 Suppressing Bottom and Sea Surface Reflections in Shallow........................................2-13
2.9 Rejecting Sonar Interference and Noise..........................................................................2-14
2.9.1 Identifying noise source ......................................................................................2-14
2.9.2 Interference rejector............................................................................................2-14
2.9.3 Changing Tx interval ...........................................................................................2-15
2.9.4 Shifting Tx frequency...........................................................................................2-15
2.9.5 Noise limiter.........................................................................................................2-16
2.10 Adjusting Beamwidth .......................................................................................................2-16
nd
AGC ...............................................................................................................2-12
iii
2.11 Tracking a Fish School (target lock) ................................................................................2-17
2.11.1 Selecting target lock type....................................................................................2-17
2.11.2 Fish school mode................................................................................................2-18
2.11.3 Position mode......................................................................................................2-19
2.12 Detecting Fish Schools Aurally........................................................................................2-20
2.12.1 Selecting audio sector.........................................................................................2-20
2.12.2 Selecting direction...............................................................................................2-21
2.12.3 Automatic training ...............................................................................................2-21
2.12.4 Reverberation......................................................................................................2-22
2.13 Presentation Mode...........................................................................................................2-22
2.13.1 Presentation mode description ...........................................................................2-22
2.13.2 How to select a presentation mode.....................................................................2-23
2.14 Fish Alarm........................................................................................................................2-24
2.15 Relocating Fish School for Easy Observation.................................................................2-26
2.16 Comparing Fish School Concentration............................................................................2-27
2.17 Measuring Fish School Speed.........................................................................................2-28
2.17.1 Entering fish marks .............................................................................................2-28
2.17.2 Deleting fish marks..............................................................................................2-29
2.18 Event Mark, Own Ship Position Mark..............................................................................2-30
2.18.1 Entering an event mark.......................................................................................2-30
2.18.2 Entering an own ship position mark....................................................................2-31
2.18.3 Erasing an event mark, own ship position mark.................................................2-31
2.19 Net Course Mark..............................................................................................................2-32
2.19.1 Inscribing the net course mark............................................................................2-32
2.19.2 Deleting the net course mark..............................................................................2-33
2.20 Observing Net Behavior...................................................................................................2-33
2.21 Storing, Recalling Picture.................................................................................................2-34
2.21.1 Storing the picture ...............................................................................................2-34
2.21.2 Recalling stored picture.......................................................................................2-35
2.22 H-SCAN SETTING Menu Overview ................................................................................2-35
2.22.1 Displaying the H-SCAN SETTING menu............................................................2-35
2.22.2 H-SCAN SETTING menu description .................................................................2-36
2.23 Interpreting the Horizontal Display...................................................................................2-40
2.23.1 Sample echo displays.........................................................................................2-40
3. VERTICAL MODE .........................................................................................3-1
3.1 Basic Operating Procedure................................................................................................3-1
3.2 Vertical Mode Indications and Marks.................................................................................3-2
3.2.1 Vertical bearing mark, tilt mark..............................................................................3-3
3.2.2 Trackball mark position reference mark................................................................3-4
3.3 Vertical Mode Concept.......................................................................................................3-4
3.4 Setting the Vertical Bearing Mark, Auto Train....................................................................3-5
3.4.1 Setting the vertical bearing mark ..........................................................................3-5
3.4.2 Auto train...............................................................................................................3-5
3.5 Display Range....................................................................................................................3-6
3.6 Measuring the Range.........................................................................................................3-6
3.7 Eliminating Weak Echoes..................................................................................................3-7
iv
3.8 Suppressing Bottom Tail ....................................................................................................3-9
3.8.1 AGC.......................................................................................................................3-9
3.8.2 By decreasing pulselength....................................................................................3-9
3.9 Rejecting Interference and Noise ....................................................................................3-10
3.9.1 Identifying noise source ......................................................................................3-10
3.9.2 Interference rejector............................................................................................3-10
3.9.3 Noise limiter.........................................................................................................3-10
3.10 Adjusting Beamwidth .......................................................................................................3-11
3.11 V ertical Expansion Display...............................................................................................3-12
3.12 V-SCAN SETTING Menu Overview.................................................................................3-13
3.12.1 Displaying the V-SCAN SETTING menu ............................................................3-13
3.12.2 V-SCAN SETTING menu description..................................................................3-14
3.13 Application to Bonito and Tuna Fishing ...........................................................................3-17
3.13.1 Searching ............................................................................................................3-17
3.13.2 Tracking...............................................................................................................3-17
3.13.3 Approaching ........................................................................................................3-18
3.13.4 Catching ..............................................................................................................3-18
4. ECHO SOUNDER MODE..............................................................................4-1
4.1 Basic Operating Procedure................................................................................................4-1
4.2 Typical Echo Sounder Displays .........................................................................................4-2
4.2.1 Echo sounder 1 display.........................................................................................4-2
4.2.2 Echo sounder 2 (net recorder or echo sounder) display......................................4-3
4.2.3 Echo sounder combination mode (ES1 + ES2)....................................................4-4
4.3 Selecting an Echo Sounder Mode.....................................................................................4-6
4.3.1 Enabling an echo sounder mode..........................................................................4-6
4.4 Selecting Display Range....................................................................................................4-8
4.5 Adjusting the Gain............................................................................................................4-10
4.6 Picture Advance Speed.................................................................................................... 4-11
4.7 Measuring Depth, Distance..............................................................................................4-12
4.8 Comparing Fish School Concentration............................................................................4-13
4.9 ES1 SETTING Menu Overview .......................................................................................4-15
4.9.1 Displaying the ES1 SETTING menu...................................................................4-15
4.9.2 ES1 setting menu description.............................................................................4-15
4.10 ES2 SETTING Menu Overview .......................................................................................4-17
4.10.1 Displaying the ES2 SETTING menu...................................................................4-17
4.10.2 ES2 SETTING menu description........................................................................4-17
5. HISTORY MODE............................................................................................5-1
5.1 Basic Operating Procedure................................................................................................5-1
5.2 Sample History Display......................................................................................................5-2
5.3 How to Interpret, Set the History Display...........................................................................5-3
5.3.1 Interpreting the history display..............................................................................5-3
5.3.2 Setting the history marker.....................................................................................5-3
5.3.3 Setting the width of the history marker..................................................................5-4
5.3.4 Setting the picture advance mode ........................................................................5-5
v
6. NAV DATA DISPLAY .....................................................................................6-1
6.1 Nav Data Displays..............................................................................................................6-1
6.1.1 Full nav data display .............................................................................................6-1
6.1.2 Abbreviated nav data display................................................................................6-2
6.1.3 Nav data description .............................................................................................6-3
7. CUSTOMIZING THE EQUIPMENT ...............................................................7-1
7.1 User Menu..........................................................................................................................7-1
7.1.1 Deleting items from user menu.............................................................................7-1
7.1.2 Programming the user menu ................................................................................7-2
7.2 Function Keys (F1-F6).......................................................................................................7-3
7.2.1 Executing a function..............................................................................................7-4
7.2.2 Programming function keys ..................................................................................7-6
7.2.3 Erasing programs..................................................................................................7-6
7.3 USER PROG Control.........................................................................................................7-8
7.3.1 Selecting a user program......................................................................................7-8
7.3.2 Programming the USER PROG control................................................................7-8
8. OTHERS MENU.............................................................................................8-1
8.1 ES1 SETTING, ES2 SETTING Menu ................................................................................8-1
8.2 ERASE MARKS menu.......................................................................................................8-2
8.3 DISPLAY SETTING menu .................................................................................................8-2
8.3.1 Opening the DISPLAY SETTING menu................................................................8-2
8.3.2 DISPLAY SETTING menu description..................................................................8-3
8.4 FISH ALARM & AUDIO menu............................................................................................8-4
8.4.1 Opening the FISH ALARM & AUDIO menu..........................................................8-4
8.4.2 FISH ALARM & AUDIO menu description ............................................................8-4
8.5 PRESET, MEMORY CARD menu .....................................................................................8-5
8.5.1 PRESET, MEMORY CARD menu description......................................................8-5
8.6 INITIAL SETTING menu ....................................................................................................8-6
8.6.1 INITIAL SETTING menu description.....................................................................8-6
9. MEMORY CARD OPERATION......................................................................9-1
9.1 Storing Image, Configuration.............................................................................................9-1
9.2 Loading, Deleting Files ......................................................................................................9-2
9.3 Formatting Memory Cards.................................................................................................9-4
10. MAINTENANCE, TROUBLESHOOTING ..................................................10-1
10.1 Preventive Maintenance ..................................................................................................10-1
10.2 Cleaning the Equipment...................................................................................................10-1
10.3 Hull Unit Maintenance......................................................................................................10-2
10.4 Transducer Maintenance.................................................................................................10-3
10.5 Fuse Replacement...........................................................................................................10-3
10.6 Troubleshooting ...............................................................................................................10-4
10.7 Warning Messages..........................................................................................................10-5
10.8 Error Codes......................................................................................................................10-6
10.9 Status Messages..............................................................................................................10-6
vi
10.10 Tests.......................................................................................................................... .......10-7
10.10.1 TEST menu .........................................................................................................10-7
10.10.2 Board test............................................................................................................10-8
10.10.3 Panel test ............................................................................................................10-9
10.10.4 Test pattern........................................................................................................10-10
10.10.5 Rx test (For service technician)........................................................................10-11
10.10.6 Noise test (For service technician)....................................................................10-11
10.11 Raising the Transducer from the Hull Unit.....................................................................10-12
10.11.1 Raising the transducer automatically................................................................10-12
10.11.2 Raising the transducer manually.......................................................................10-13
MENU TREE......................................................................................................M-1
SPECIFICATIONS...........................................................................................SP-1
INDEX......................................................................................................... Index-1
vii
FOREWORD
A Word to the Owner of the FURUNO FSV-24
Congratulations on your choice of the FURUNO FSV-24 Color Scanning Sonar.
We are confident you will see why the FURUNO name has become synonymous
with quality and reliability.
For over 50 years FURUNO Electric Company has enjoyed an enviable
reputation for quality marine electr onics equipment. This dedication to
excellence is furthered by our extensive global network of agents and dealers.
This equipment is designed and constructed t o meet the rigorous demands of
the marine environment. However, no machine can perform its int ended function
unless operated and maintained properly. Please carefully read and follow the
recommended procedures for operation and maintenance.
We would appreciate hearing from you, the end-user, about whether we are
achieving our purposes.
Thank you for considering and purchasing FURUNO equipment .
Features
The FSV-24 is a full-circle, multibeam electronic color scanning sonar which
detects and displays fish schools on a 21-inch non-glare, high-resolution color
monitor. (System also available without monitor.)
The main features of the FSV-24 are
• Vivid 32-color echo strength dependent display for improved recognition of
bottom, f ish school concentration, distribution and volume.
• Memory cards for unlimited st orage and replay of picture and settings.
• Function keys for direct access to desired menu item.
• User programs for one-touch setup of equipment.
• Menu-driven operation.
• Wide variety of display modes: Horizontal, vertical, history, and echo sounder.
• Fish histogram shows signal strength distribution of echo within estimate
mark.
• Various marks and alphanumeric fishing and navigation inf ormation for
intuitive operation.
viii
• Audio function allows monitoring of echoes along user-selected area through
built-in loudspeaker.
• Fish mark estimat es fish speed.
• Fish estimate f eat ure compares volume of two fish schools.
• Target lock automatically tracks fish school.
• Net course mark shows probable drift of net against tide.
• Event mark denotes important locations.
• High power MOS FET transmitter for reliable operation.
• Automatic screen degaussing
• Comprehensive testing facility
ix
This page is intentionally left blank .
SYSTEM CONFIGURATION
Standard type
Loudspeaker
Sub Monitor
Echo Sounder,
Current Indicator,
other
Navigator 1
Navigator 2
MONITOR
UNIT
FSV-2400
PROCESSOR UNIT
FSV-2402
AD Converter
AD-10
Current
Indicator
Current
Indicator/Log
E/S Interface
VI-1100A
Net Recorder
VI-1100A
CONTROL UNIT
FSV-2401
Local Supply
Option
Gyrocompass
External
Interface CS-120A
(already installed)
Note 1
100/110/115/
220/230 VAC,
1φ, 50/60 Hz
100/110/115/
220/230 VAC,
1φ, 50/60 Hz
POWER
SUPPLY
UNIT
FSV-242
Note 1: Power Kit FSV-2403 (option, installed in
processor unit) required to connect CS-120A.
TRANSCEIVER
UNIT
FSV-241E
Standard type configuration
Cable for
Extension Kit
FSV-2451
FSV-2452
HULL UNIT
Net Sonde
Junction Box
CS-170
220 VAC,
3φ, 50/60 Hz
Hull unit Specifications
FSV-247
FSV-248
VI-1100A
Net Sonde
1200 mm stroke
1600 mm stroke
x
Blackbox type
CONTROL UNIT
FSV-2401
Loudspeaker
Sub Monitor
Echo Sounder,
Current Indicator,
other
Navigator 1
Navigator 2
External
Interface CS-120A
(already installed)
Note 1
Monitor
PROCESSOR UNIT
FSV-2402
Local Supply
Option
AD Converter
AD-10
Current
Indicator
Current
Indicator/Log
E/S Interface
VI-1100A
Net Recorder
VI-1100A
Net Sonde
Junction Box
CS-170
Gyrocompass
VI-1100A
Net Sonde
100/110/115/
220/230 VAC,
1φ, 50/60 Hz
100/110/115/
220/230 VAC,
POWER
SUPPLY
UNIT
FSV-242
Note 1: Power Kit FSV-2403 (option, installed in
processor unit) required to connect CS-120A.
1φ, 50/60 Hz
TRANSCEIVER
UNIT
FSV-241E
Blackbox type configuration
Cable for
Extension Kit
FSV-2451
FSV-2452
HULL UNIT
(Select one.)
220 VAC,
3φ, 50/60 Hz
Hull unit Specifications
FSV-247
FSV-248
1200 mm stroke
1600 mm stroke
xi
1. OPERATIONAL OVERVIEW
1.1 Control Description
Automatic transducer train width
on audio bearing mark (horizontal
mode), vertical bearing mark
Adjusts volume of internal
and external (option) loudspeaker.
(vertical mode).
Off→±12°→ ±24°→±36°→Off
Raise, lower the transducer.
: Raises the transducer.
: Lowers the transducer
(mid protrusion).
: Lowers the transducer
(full protrusion).
Turns power off.
Turns power on.
Adjusts display brilliance
(supplied monitor only).
Adjusts receiver
sensitivity (horizontal and vertical modes).
Selects display
range (horizontal
and vertical modes).
Selects display
mode.
Expands respective
vertical mode; confirms
respective vertical bearing
mark location for vertical mode.
Displays range
and audio bearing marks
to monitor echoes along
audio bearing mark
(horiizontal mode).
Selects user
program.
Execute assigned
program.
Note:
The BRILLIANCE and AUDIO can
not be adjusted from the sub control unit
(option).
Selects mode (horizontal
or vertical) for which
to adjust sensitivity,
select range.
Sets transducer
tilt angle
(horizontal
mode).
Deletes
trackballselected
mark.
SHOOT: Displays net data.
EVENT: Inscribes event mark,
ESTIMATE 1, 2: Compares volume of
TARGET LOCK: Tracks fish school.
FISH: Measures speed of
Figure 1-1 Control unit
Trackball
• Positions trackball
mark.
• Selects items,
options on menu.
Opens, closes menu.
Off centers the picture.
own ship position mark.
two fish schools.
fish school.
1-1
1. OPERATIONAL OVERVIEW
1.2 Turning the Power On/Off
1.2.1 Turning the power on
Press the POWER ON (|) switch. A beep sounds, the lamp above the switch
lights, and the last-used mode is presented.
1.2.2 Turning the power off
1. First retract the transducer with the [
] key. The lamp above the switch blinks
while the transducer is being raised and lights steadily when it is fully raised.
Note: While raising the transducer, the ship speed speed must be as below
to prevent damage to the transducer.
1200 mm stroke: 12 kts or less
1600 mm stroke: 15 kts or less
2. Press the POWER OFF (
) switch for more than one second, after the [
]
key lights steadily.
Note: The transducer is automatically retracted int o t he tank if the POWER OFF
) switch is pressed before retracting the transducer. However, for
(
safety purposes, make it a habit to retract the transducer before turning off
the power.
POWER
TRANSDUCER
1-2
POWER OFF key
POWER ON key
Mid protrusion key
Retraction key
Full protrusion key
Figure 1-2 POWER & TRANSDUCER key
1. OPERATIONAL OVERVIEW
1.3 Lowering, Raising the Transdu cer
1.3.1 Lowering the transducer
With the boat at the fishing ground, press the [ ] or [ ] key. The lamp above the
key pressed blinks during lowering and lights when the transducer is completely
lowered. In normal use fully lower the transducer. If the transducer becomes
entangled in the net for some reason, partially raise the t r ansducer with the [
key. This raises the transducer by 400 mm.
1.3.2 Raising the transducer
Press the [ ] key to raise the transducer. The lamp above the switch blinks while
the transducer is being raised and lights steadily when it is fully raised.
CAUTION
]
Maximum speed while the transducer is
projected and being raised or lowered
is as below, to prevent damage to the
transducer.
Projected Raising/
Lowering
1200 mm stroke Max. 18 kt Max. 15 kt
1600 mm stroke Max. 15 kt Max. 12 kt
1.4 Screen Brilliance
The [BRILLIANCE] control adjusts screen brilliance. Adjust it to suit lighting
conditions.
Note :The brilliance of an external monitor cannot be adjusted with the [BRILL]
control. Use the associated control on the monitor.
1-3
1. OPERATIONAL OVERVIEW
1.5 Control Panel Dimmer
The dimmer for the control panel may be adjusted on the DI SPLAY SETTING
menu as below.
1. Press the [MENU] key to open the menu.
MENU QUIT
TX PULSE LENGTH-H : 9
TX POWER-H : 9
TVG-NEAR-H : 0
TVG-MEDIUM-H : 0
TVG-FAR-H : 0
AGC-H : 0
2ND AGC-H : 0
ECHO AVERAGE-H : 0
COLOR-H : COLOR 1
COLOR RESPONSE-H : COLOR CURVE 3
H-SCAN SETTING...
V-SCAN SETTING...
OTHERS...
Figure 1-3 Menu (default)
2. Use the trackball to select OTHERS and press the [MENU] key.
MENU
OTHERS
ES1 SETTING...
ES2 SETTING...
ERASE MARKS...
DISPLAY SETTING...
FISH ALARM & AUDIO...
PRESET, MEMORY CARD...
INITIAL SETTING...
QUIT
QUIT
Figure 1-4 OTHERS menu
1-4
1. OPERATIONAL OVERVIEW
3. Use the trackball to select DISPLAY SETTING and press the [MENU] key.
MENU
OTHERS
DISPLAY SETTING
DISPLAY MODE...
MODE SELECTION : MODE KEY
PRESENTATION MODE :HEAD UP
TM DISPLAY RANGE :1.6R
BEARING REF : SHIP HEADING
H-SLICE WIDTH : 16
H-SLICE PICT ADVC : KP SYNC
NET COURSE MARK : ENTER
MANUAL DEGAUSS : EXECUTE
AUTO DEGAUSS : INT SENSOR
DIMMER : 10
KEY BEEP VOLUME : 5
QUIT
QUIT
QUIT
Figure 1-5 DISPLAY SETTING menu
4. Select DIMMER with the trackball and press the [MENU] key to open the
dialog box.
QUIT
CANCEL
DIALOG BOX FOR SETTING NUMERIC DATA
Select (raise setting) or (lower setting) with
the trackball and press [MENU] key to change
setting. Select QUIT to finish; CANCEL to cancel
operation.
Figure 1-6 Dialog box for setting numeric value
5. Select S (raise setting) or T (lower setting) with the trackball.
6. Use the [MENU] key to change the setting.
7. Select QUIT with the trackball and press the [MENU] key.
8. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
1-5
1. OPERATIONAL OVERVIEW
1.6 Display Mode, Display Division
This sonar provides a total of nine display mode selections: Horizontal, Vertical1,
Vertical1 + Vertical2, Vertical1 + ES1 (echo sounder), Vert ical 1 + ES2 (echo
sounder or net recorder), History, ES1, ES2, and ES1 + ES2. The user may
preset as many modes as desired and select one with the [MODE] key. The
default modes are Horizontal, Vertical 1, Vertical 1 + Vertical 2, and History.
1.6.1 Selecting a display mo de
Press the [MODE] key several times until the desired displa y appe ars. Note that
the [MODE] key may be programmed to show a pull-down menu instead. (For
further details, see MODE SELECTION on page 8-3.)
1. Press the [MODE] key. The following pull- down menu appears.
HORIZONTAL
V1
V1&V2
V1&ES1
V1&ES2
HISTORY
ES1
ES2
ES1&ES2
Figure 1-7 Pull-down menu (all display modes preset)
2. Use the trackball to select display mode desired .
3. Press the [MENU] key to display the selected mode.
1-6
1.6.2 Sample display mode pictures
Below are typical pictures. For sake of brevity indications and m arks are not
shown.
Horizontal mode
This mode provides 360 degree coverage aroun d the vessel and it is useful for
general search. For further details see Chapter 2.
N
1. OPERATIONAL OVERVIEW
NAV
W
2000
S
E
DATA
DISPLAY
Figure 1-8 Horizontal mode display
1-7
1. OPERATIONAL OVERVIEW
V1 and V2 modes
The V1 and V2 modes show a vertical slice of the bearing selected by the
vertical bearing mark on the horizontal display. The vertical 2 mode provides two
vertical slices. Chapter 3 discusses the vertical mode.
Figure 1-9 V1 and V2 displays
V1 + ES1 (or ES2) mode
The V1 + ES1 (or ES2) combines the vertical 1 display with the picture from an
echo sounder or a net recorder.
1-8
Figure 1-10 V1 & ES1 (ES2) display
1. OPERATIONAL OVERVIEW
History mode
The history mode shows the horizontal and history dis plays. Echo data for the
echoes within the history marker on the horizontal display scroll down t he history
display in the downward direction – the latest echoes at the top and the oldest at
the bottom. This mode is useful for observing fish echoes over tim e. For f urt her
details see Chapter 5.
N
NAV DATA DISPLAY
W
S
Horizontal Display
History Display
E
Figure 1-11 History display
ES1 mode
The ES1 mode shows the echo sounder displays. For furt her details see
Chapter 4.
N
NAV DATA DISPLAY
W
S
Horizontal Display
E
Echo Sounder
Display (ES1)
Figure 1-12 ES1 display
1-9
1. OPERATIONAL OVERVIEW
ES2 mode
The ES2 mode shows the net recorder display. The net recorder display can
show the downward looking picture alone or both the downward and upward
looking pictures. Note that this m ode can also show the echo soun der picture.
N
NAV DATA DISPLAY
W
E
Net Recorder
Display (ES2)
S
Horizontal Display
Figure 1-13 ES2 display (shown: downward picture)
ES1 + ES2 mode
The ES1 + ES2 mode shows the echo sounder and net recorder displays.
N
NAV DATA DISPLAY
0
30
Echo Sounder
W
E
Display (ES1)
1-10
60
0
Net Recorder
30
Display (ES2)
S
Horizontal Display
60
Figure 1-14 ES1 + ES2 display
1.7 Adjusting the Gain
The [GAIN] control adjusts receiver gain (sensitivity) for the horizontal and
vertical modes. Adjust it so fish echoes are clearly displayed with minimal noise
on the screen. Too high a gain setting not only displays excess noise a nd makes
it difficult to discriminate wanted echoes but also causes bottom echoes to be
painted in strong colors, resulting in echoes being masked by bott om reflections.
Normally, set the control somewhere between positions 3 and 7.
1. If the horizontal and vertical modes are active, press t he [H/V] key to show
the range and gain indications of the mode you wish to adjust in yellow.
2. Adjust the [GAIN] control.
New gain setting is momentarily displayed in large characters at the top of
the horizontal display and center of the vertical 1 display. Gain is always
displayed at the top right-hand corner of the horizontal display and bottom
left-hand corner on the vertical 1 display.
1. OPERATIONAL OVERVIEW
Gain too low
Gain proper
Gain too high
Figure 1-15 Example of proper and improper gai n set tings
on the horizontal display
1-11
1. OPERATIONAL OVERVIEW
1.8 Menu Overview
Most operations are carried out through the menu. This section provides basic
menu operating information.
1. Press the [MENU] key to open the menu.
USER MENU
This menu may be
programmed as
desired (max. 10
items). Shown here
are the items of the
default user menu.
Select menu with trackball,
and then press [MENU] key
to display. (Ellipsis mark
(...) indicates a menu.)
MENU
TX PULSE LENGTH-H : 9
TX POWER-H : 9
TVG-NEAR-H : 0
TVG-MEDIUM-H : 0
TVG-FAR-H : 0
AGC-H : 0
2ND AGC-H : 0
ECHO AVERAGE-H : 0
COLOR-H : COLOR 1
COLOR RESPONSE-H : COLOR CURVE 3
H-SCAN SETTING...
V-SCAN SETTING...
OTHERS...
QUIT
Select QUIT with trackball
and then press [MENU] key
to close menu.
Figure 1-16 Menu
2. Select menu desired with the trackball and press the [MENU] key. (For
example, select the H-SCAN SETTING menu.)
MENU TITLE
Select QUIT with trackball
and press the [MENU]
key to close menu
currently open.
Menu items and
current settings
MENU QUIT
H-SCAN SETTING
TX INTERVAL
TX PULSE LENGTH
TX POWER
TVG-NEAR
TVG-MEDIUM
TVG-FAR
NOISE LIMITER
AGC
2ND AGC
ECHO AVERAGE
INT REJECT
FREQ SHIFT : 1
OTHERS...
: 9
: 9
: 9
: 0
: 0
: 0
: 2
: 0
: 0
: 0
: 0
QUIT
Choose QUIT to close
all menus.
Pointer shows current
selection.
1-12
Figure 1-17 H-SCAN SETTING menu
1. OPERATIONAL OVERVIEW
3. Select menu item desired with the trackball and press the [ MENU] key. (For
example, select NOISE LIMITER.) A dialog box for the corresponding menu
item appears.
MENU QUIT
H-SCAN SETTING
TX INTERVAL
TX PULSE LENGTH
TX POWER
TVG-NEAR
TVG-MEDIUM
TVG-FAR
NOISE LIMITER
AGC
2ND AGC
ECHO AVERAGE
INT REJECT
: 9
: 9
: 9
: 0
: 0
: 0
: 5NOISE LIMITER
: 2
: 0
: 0
: 0
: 0
QUIT
QUIT
CANCEL
How to set numeric data
1. Select or as desired.
2. Press the [MENU] key to
change setting.
3. Select QUIT to finish.
FREQ SHIFT : 1
OTHERS...
Figure 1-18 H-SCAN SETTING menu
4. Select S (raise setting) or T (lower setting) with the trackball and press t he
[MENU] key to change setting.
Note: For items having options the arrows in the dialog box are replaced with
appropriate options. For example t he dialog box for selection of picture
advance speed in the echo sounder mode looks as below.
QUIT
CANCEL
1/1
1/2
1/4
1/8
SPEED SYNC
Figure 1-19 Echo sounder picture advance speed dialog box
5. Use the trackball to select QUIT from the dialog box a nd press the [MENU]
key to close the menu.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
1-13
1. OPERATIONAL OVERVIEW
Note: In the default setting, the sub menu items INITIALIZE and INITIAL
SETTING in the OTHERS menu are shown in red. This means their item s are
locked to prevent accidental change of sett ing. When you open one of these sub
menus and select an item the message below appears. To change the setting of
the selected item select YES and press the [MENU] key, and the dialog box for
the item selected appears. To escape, select CANCEL and press the [MENU]
key. You may wish not to show the message below, that is, release the setting
protection feature. For further details, see ITEM ATTRIBUTION on page 8-16.
CAUTION
THIS ITEM IS DEFINED AS NON-CHANGEABLE ITEM.
ARE YOUSURE TO CHANGE IT TO CHANGEABLE?
YES
NO
Figure 1-20 Caution for menu setting change
1-14
2. HORIZONTAL MODE
2.1 Basic Operating Procedure
4.
Select horizontal display.
2.
Lower transducer.
1.
Turn on power.
3.
Adjust display brilliance.
6.
Select range.
8.
Set tilt angle.
7.
Adjust gain.
5.
Press to choose horizontal or
vertical to adjust gain and range.
Figure 2-1 Control unit
2-1
2. HORIZONTAL MODE
2.2 Horizontal Mode Indications and Marks
The horizontal mode provides a 360° picture around the boat. To display the
horizontal mode picture press the [MODE] key.
Net shoot data
Distance run from shooting
Time from shooting
Trackball data
•
Slant range
•
Horizontal range
•
Depth
•
Relative bearing
or True bearing*
Wind speed, direction*
Latest event mark
Auto train mark
Audio bearing mark
Heading mark
North mark*
Own ship mark
Current (tide)
mark*
Range ring
Bearing scale
Event mark
Event mark data
•
Horizontal range
•
Present depth
•
Depth at measured
•
Relative bearing
or True bearing*
148m
142m
45m
B 115˚
W 12m/s
A
W
158m
48m
(210m)
B 330˚
Range
mark
Trackball mark
position
0.53NM
5:32
1
2
34°56.789N
123°45.678E
Range ring
data
1
2
3
Net
sonde mark*
Fish track
Target lock mark
Fish movement vector
N
1
85
3
1
2
3
2
1
2
150
S
3
1
1
2
3
1
2
3
Net shoot
mark
Range mark and
audio bearing
mark data
Presentation mode
Scan data
N-UP
R 300m
AUTO
G10
P 8
17˚T
(21˚)
Range
Current auto tilt
Gain
User program no.
Fish mark
Latest fish mark
Line connecting
fish marks
Fish estimate mark
Fish estimate mark no.
Fish estimate mark data
Trackball mark
E
Own ship position mark
Ship's track*
230m
R 146m
B 290˚
70m
S 12.3kt
C 262˚
*
Requires appropriate
sensor.
Target lock/fish movement data
•
Horizontal range
•
Depth
•
Speed
•
Course
2-2
Figure 2-2 Horizontal mode indications and marks
2.3 Display Range
The [RANGE] control selects the detection range. The range selected is
momentarily displayed in large characters at the top of the screen. Range is
always displayed at the top right hand corner of the screen.
BOTTOM
BOTTOM
Figure 2-3 Range concept
Below are the default ranges (in meters).
Range Setting 1 2 3 4 5 6 7 8
Range 200 400 600 1000 1600 2000 3000 4000
SEA SURFACE
SEA SURFACE
Range indicated
on the screen.
Range indicated
on the screen.
2. HORIZONTAL MODE
1. If the horizontal and vertical m odes are active, press the [H/V] key to show
the range and gain indications of the horizontal mode in yellow. (This step is
not necessary when only the horizontal m ode is active.)
Note: Range and gain indications are shown in white on other modes.
2. Operate the [RANGE] control to select desired range.
Note 1: Ranges may be preset as desired on the PRESET, MEMORY CARD
menu. For further details see H-SCAN RANGE on page 8-5.
Note 2: With the target lock feature active, range is automatically changed
according to target position. (INTERLOCK on the TARGET LOCK menu
set to the option TILT&RANGE)
2.4 Tilt Angle
The tilt angle shows the direction to which the sound wave is emitted. When the
sound wave is emitted horizontally, the tilt angle is said to be 0° and when
vertically, 90°. The tilt angle can be set in increments of 1° from -5° (upward) to
60° (downward).
2.4.1 Setting the tilt angle
To manually set a tilt angle, operate the [TILT] control. Watch the tilt angle
indication and tilt angle indicator at the top right corner of the screen.
Select tilt angle depending on target f ish. For surface fish select a shallow angle
(about 5°) and for bottom fish, a deep angle (a bout 40°).
2-3
2. HORIZONTAL MODE
2.4.2 Automatic tilt
The [AUTO TILT] key automat ically scans the tilt angle within the selected width.
This is useful when you want to find the center depth of a fish school.
1. Press the [AUTO TILT] key to select auto tilt angle desired. Each time the
[AUTO TILT] key is pressed the auto tilt angle changes in the following
sequence.
OFF → ±1 - ±4°→ ±2 - ±6°→ ±3 - ±8°
OFF → ±2 - ±10°→ ±4 - ±16°→ ±6 - ±20°
Table 2-1 Automatic tilt range (default, narrow) with AUTO TILT key
Range Width (1) Width (2) Width (3) Period
60, 100
150, 200
300, 400
500, 600
800
1000
more than 1200
±4°∗
±2°
±1°
As above
As above
As above
As above
±6°∗
±4°∗
±2°
As above
As above
As above
As above
±8°∗
±6°∗
±4°∗
±3°
As above
As above
As above
(Narrow)
(Wide)
Period: One trans.
Tilt angle changes
in 2° increments
for
asterisk-marked
width;
1° increments for
all other widths.
2. Auto tilt begins, with the tilt angle set with the [TILT] control as the center tilt
angle.
3. If necessary, change center tilt angle with the [TILT] control.
Note: Wide tilt angle is also available, from the SYSTEM menu. For details,
contact your dealer or refer to Installation manual.
Table 2-2 Automatic tilt range (wide) with AUTO TILT key
Range Width (1) Width (2) Width (3) Period*
60, 100, 150
200
300, 400
500, 600
800
1000
more than 1200
±10°
As above
As above
±8°
±6°
±4°
±2°
±16°
As above
As above
As above
±12°
±8°
±4°
±20°
As above
As above
As above
±16°
±12°
±6°
Every 4 trans.
Every 3 trans.
Every 2 trans.
As above
As above
As above
As above
*: The period shows for the horizontal mode. In the V1/V2 m ode, every 2
transmissions for 60 to 200 m range and every transmission for 300 m
range and greater.
2-4
2. HORIZONTAL MODE
For example, when the [RANGE] control, [TILT] control and [AUTO TILT] key are
set to 200 m, 8
transmission as follows:
→9°→10°→9°→8°→7°→6°→7°→8°→ …
8°
Note: The [AUTO TILT] key is inoperative when the target lock function is active
or is made active. Once the target lock is turned off auto tilt operation is
resumed.
° and width (1) respectively, t he tilt angle changes at each
Tilt angle setting
Figure 2-4 Auto tilt concept
2.4.3 Bottom echo and tilt angle
Refer to the illustration on the next page.
Case 1: Tilt angle 30°°°° to 40°°°°
This tilt angle will display the entire bottom since it is captured by the full width of
the beam.
Case 2: Tilt angle 10°°°° to 20°°°°
This tilt angle will only display half the bottom since it is captured by only the
lower half of the beam.
Case 3: Tilt angle 0°°°° to 5°°°°
This tilt angle may or may not capture the bottom since the returning echo is
weak.
2.4.4 How to discriminate fish echoes from the bottom
The figure at the top of the next page illustrates how two fish schools “a” and “b”
are displayed on the screen using three different tilt angles.
Case 1 (Tilt angle 30
Case 2 (Tilt angle 10
Case 3 (Tilt angle 0
°°°° to 40°)
°°°° to 20°)
°°°° to 5°)
°): Fish school is obscured by the bottom .
°)°)
°): Fish school is located above the bottom.
°)°)
°): Fish school is located close to the bottom.
°)°)
2-5
2. HORIZONTAL MODE
Case 1
Fish school "a"
Bottom
Case 1
Figure 2-5 Fish echo and tilt angle
Case 2
Fish school "a"
Bottom
Case 2
Fish school "a"
Fish school "b"
Bottom
Case 3
Case 3
Points to consider
• Normally, a vertically distribut ed fish school is a better sonar target than the
bottom, because it reflects the transmitted pulse back toward the transducer.
• In case 3, both fish schools “a” and “b” are presented. Generally speaking,
however, midwater fish schools tend to be larger than bottom fish schools
and they are often displayed near the bottom on the display.
• It is difficult to detect bottom fish when they are not distributed vertically.
2.4.5 Tilt angle for surface fish
Sound emitted from the sonar transducer forms an oval-shaped beam with a
width of approximately 12° in the vertical direction (vertical beam width at -6dB).
The tilt angle is indicated by the angle between the centerline of the beam and
the horizontal plane. Then, if the tilt angle is set t o 0 °, the centerline is parallel
with the sea surface and one half of the emit ted sound goes upward, toward the
sea surface.
This causes one half of the emitted sound to be reflected toward the transducer
and displayed on the screen as sea surface reflections. When the sea is calm,
since the sound is reflected j ust like a light hit ting a mirror at a low incident angle,
it propagates away and the sea surface reflections become negligible.
However if the sea is not calm enough, they will become dominant and interfere
with observation of wanted echoes. To minimize these sea surface reflections
and to search surface fish schools effectively, the tilt angle is usually set
between 5° and 6° so the upper portion of the beam becomes almost parallel
with the sea surface. When the sea is rough, the t ilt angle is slightly increased to
lessen the affect of sea surface reflections.
2-6
Sea surface
2. HORIZONTAL MODE
2.4.6 Suitable tilt angle
The figure below illustrates the relat ionship among tilt angle, depth and detection
range. Refer to it to find out the suitable t ilt angle for a given depth/detection
range.
Tilt angle and beam coverage (vertical beamwidth 12
100
(200)
20(40)
40(80)
60(120)
80(160)
100(200)
Depth (m)
Tilt angle 0°
Tilt angle 5-7°
Figure 2-6 Tilt angle
° at -6dB
200
(400)
12°
Sea surface
12°
)
300
(600)
Range (m)
400
(800)
0
°
5
°
10
°
15
°
200(400)
Vertical width of sonar beam
100 m100 m
12
°
300 m
200 m
21 m
42 m
63 m
Figure 2-7 Tilt angle and beam coverage
2-7
2. HORIZONTAL MODE
2.5 Finding Range and Bearing to a Target
Operate the trackball to place the trackball mark on the target you want to
measure the range and bearing. The range, bearing and depth to the target
appear at the upper left corner of the screen.
î
TRACKBALL DATA
î
Slant range
è
Horizontal range
ê
Depth
B Relative or
True bearing*
è
ê
B
Trackball mark
*True bearing requires
appropriate sensor.
34°56.789N
123°45.678E
Figure 2-8 Location of trackball data
2.6 Eliminating Weak Echoes
Echoes from targets such as bottom and fish return to the transducer in order of
distance to them, and when we compare their intensities at the tr ansducer face,
those from nearer targets are generally stronger when their reflecting propert ies
are nearly equal. The sonar operator will be quite inconveni enced if these
echoes are directly displayed on the screen, sin ce he can not judge the actual
size of the target from the size of echoes displayed on t he screen. To overcome
use the TVG function. It compensates for propagation loss of sound in water;
amplification of echoes on short range is suppressed and gradually increased as
range increases so that similar targets are displayed in the similar intensities
irrespective of the ranges to them.
The FSV-24 has three TVG functions, NEAR, MEDIUM and FA R, and they
mainly compensate for propagation loss on short, middle and long ranges
respectively, cent ered at the ranges shown below. The higher the TVG setting
the greater the amplification of echoes.
Trackball mark
position
2-8
Near
About 100 m
Med
About 400 m
Far
About 800 m
Figure 2-9 Principle of TVG
The TVG is also used to suppress unwanted echoes and noise which appear in
1. Press the [MENU] key to open the menu.
MENU QUIT
TX PULSELENGTH-H : 9
TX POWER-H : 9
TVG-NEAR-H : 0
TVG-MEDIUM-H : 0
TVG-FAR-H : 0
AGC-H : 0
2ND AGC-H : 0
ECHO AVERAGE-H : 0
COLOR-H : COLOR 1
COLOR RESPONSE-H : COLOR CURVE 3
H-SCAN SETTING...
V-SCAN SETTING...
OTHERS...
Figure 2-10 Menu
2. HORIZONTAL MODE
2. Select the H-SCAN SETTING menu with the trackball and press the [MENU]
key.
MENU QUIT
H-SCAN SETTING
TX INTERVAL
TX PULSELENGTH
TX POWER
TVG-NEAR
TVG-MEDIUM
TVG-FAR
NOISE LIMITER
AGC
2ND AGC
ECHO AVERAGE
INT REJECT
FREQ SHIFT : 1
OTHERS...
QUIT
: 9
: 9
: 9
: 0
: 0
: 0
: 2
: 0
: 0
: 0
: 0
Figure 2-11 H-SCAN SETT ING menu
3. Select TVG-NEAR with the t r ackball and press the [MENU] key to show the
dialog box.
QUIT
CANCEL
Figure 2-12 Numeric data entry dialog box
2-9
2. HORIZONTAL MODE
4. Use the trackball to select S or T and press the [MENU] key to set. The
setting range is –5 to 5 and the default set ting is 0. The higher the setting the
further the TVG works.
5. Select QUIT and press the [MENU] key to conclude.
6. Repeat steps 3-5 to set TVG-MEDIUM and TVG-FAR.
When sea surface reflections or plankton layers disturb the picture, decrease
appropriate TVG option by one or two steps.
7. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
When fish school is located on a long range setting (about 800 meters) and
is approaching own ship do as follows:
Adjust the tilt to keep the fish school in the center of the sonar beam, namely,
fish school is displayed in strongest colors possible. Confirm that the fish
echo is displayed in the same color as it approaches. If the color suddenly
changes to weaker colors as the fish enters MEDIUM and NEAR areas, the
TVG is improperly set. Adjust the TVG. If this again produces sea surface
reflections and noise try to remove them with the AGC and noise limiter.
Note: If the above procedure does not produce satisfactory results, the
TVG curve can be changed on the OTHERS sub menu in t he H-SCAN
SETTING menu.
2.7 Suppressing Bottom Tail
2.7.1 AGC
The AGC functions to automatically reduce the receiver gain only against strong
echoes such as the bottom or a large fish school. Since weak echoes remain
unaffected, a small fish school becomes easier to detect . Adjust it so that the
AGC works only on bottom reflections. Do not set it too high; weak echoes may
be missed.
1. Press the [MENU] key to open the menu.
2. Select H-SCAN SETTING menu and press the [MENU] key.
3. Select AGC and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-9 and the default setting is 0. The higher the setting
the greater the degree of suppression.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2-10
2.7.2 By decreasing pulselength
The pulselength determines the lengt h of the transmission pulse emitted into the
water. While a longer pulse is advantageous for long range sounding, it has the
disadvantage of being poor in discrimination of targets, that is, the ability to
separate several closely located targets. When searching bottom fish, therefore,
it is useful to shorten the pulselength in order to separate f ish echoes from
bottom reflections. Decrease the pulselengt h setting to shorten the pulselength.
For search of surface and midwater fish in which bottom reflections are not so
strong, use the longest pulselength “9”.
1. Press t he [MENU] key to open the menu.
2. Select the H-SCAN SETTING menu and press the [MENU] key.
3. Select TX PULSELENGTH and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-9 and the default setting is 9. The higher the setting
the longer the pulselength.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2. HORIZONTAL MODE
2.7.3 2nd AGC
While it is ideal to suppress bottom echoes with the AGC alone there are some
fishing grounds where this is not possible. (The high power sonar has the
advantage of long-range detection but this can also be a disadvantage, since
weaker echoes may be hidden in strong, unwant ed echoes such as the bottom.)
If you cannot suppress bottom echoes or sea surf ace ref lections by the AGC
function alone, use the 2
For especially strong echoes, use a setting of 3 or 4.
1. Press the [MENU] key to open the menu.
2. Select the H-SCAN SETTING menu and press the [MENU] key.
3. Select 2
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-9 and the default setting is 0. The higher the setting
the greater the suppression.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
nd
AGC feature. Normally a setting of 1 or 2 is suitable.
nd
AGC and press the [MENU] key.
2-11
2. HORIZONTAL MODE
2.8 Suppressing Bottom and Sea Surface Reflections in Shallow
In shallow fishing grounds with hard or rocky bottom, bottom reflections often
interfere with wanted fish echoes and they can not be eliminated sufficiently with
the aforementioned TVG and AGC functions, especially when the TILT is set to a
larger angle in order to track fish schools approaching within 400 m. In such
cases try to reduce the output power by adjusting the Tx output instea d of
turning down the gain. The picture becomes clearer when output power is
reduced rather than when the GAIN is decreased as illustrated below.
INCORRECT
METHOD
CORRECT
METHOD
Fish echo
TVG and AGC
adjusted with
TX POWER kept high
Reduce TX POWER
with GAIN kept
constant
Fish echo
weakened
Fish echo
Figure 2-13 How to suppress bottom and sea surface reflections in shallow wat ers
1. Press the [MENU] key to open the menu.
2. Select the H-SCAN SETTING menu and press the [MENU] key.
3. Select TX POWER and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-9 and the default setting is 9. The higher the setting
the higher the Tx power.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2-12
2. HORIZONTAL MODE
2.9 Rejecting Sonar Interference and Noise
While observing the sonar picture, you may encounter occasional or intermittent
noise and interference. These are mostly caused by on-board electronic
equipment, engine or propeller noise, or elect rical noise from other sonars being
operated nearby.
2.9.1 Identifying noise source
To eliminate noise effectively, you should first identify the noise source as
follows:
1. Stop transmission on the TEST menu, referring to page 7-10, and turn on the
power of all on-board equipment one by one while observing the picture. If
noise appears on the sonar display, that equipment is emitting noise. Check
the offending equipment’s ground and installation.
2. Run the boat at various speeds to check if the noise is speed dependent.
If neither of the above two steps has effect on the picture, adjust one of the
following:
2.9.2 Interference rejector
This control is similar to the interference rejector on echo sounders and radars. It
is effective for rejecting random noise and sea surface reflect ions in rough sea
conditions. Set it so that noise is just eliminated. Do not use an unnecessarily
high setting since it may also reject small wanted echoes.
1. Press the [MENU] key to open the menu.
2. Select the H-SCAN SETTING menu and press the [MENU] key.
3. Select INT REJECT and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-3 and the default setting is 0. The higher the setting
the greater the degree of interf erence rejection.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2-13
2. HORIZONTAL MODE
2.9.3 Changing Tx interval
When other sonars nearby are operating the sam e transmission interval as that
of own ship’s sonar, an interference ring appears on the display. To erase the
interference ring from the screen, reduce the TX INTERVAL on the H-SCAN
SETTING menu.
Interference
Tx interval high Tx interval lowered
Figure 2-14 How TX INTERVAL works
1. Press the [MENU] key to open the menu.
2. Select the H-SCAN SETTING menu and press the [MENU] key.
3. Select TX INTERVAL and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-9 and the default setting is 9. The higher the setting
the longer the Tx interval. For transmission with external KP signal, set TX
INTERVAL on the H-SCAN SETTING menu to “0”.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
Note: When the sonar is used in shallow water with the range set between 60 m
and 200 m and Tx cycle at “9”, bottom reflections caused by the
2nd-to-the-last transmission may appear on near ranges. Lower the Tx
interval 2 or 3 to suppress them.
2.9.4 Shifting Tx frequency
If interference cannot be suppressed by the int erference rejector or Tx interval,
shift the Tx frequency with FREQ SHIFT on the H-SCAN SETTING menu.
1. Press the [MENU] key to open the menu.
2. Select the H-SCAN SETTING menu and press the [MENU] key.
3. Select FREQ SHIFT and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 1-3 and the default setting is 1.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2-14
2.9.5 Noise limiter
Weak, unwanted reflections, colored light-blue or green, appear when the water
is dirty, plankton layers exists, or due to ship’s noise. The noise limiter can
reduce the effects of these unwanted reflections. Raising the sett ing causes
unwanted reflections to become colors of blue to background color. Normally a
setting of 3 or 4 is sufficient.
1. Press the [MENU] key to open the menu.
2. Select the H-SCAN SETTING menu and press the [MENU] key
3. Select NOISE LIMITER and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-10 and the default setting is 2. The higher the setting
the greater the degree of suppression.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2. HORIZONTAL MODE
2.10 Adjusting Beamwidth
The horizontal beamwidth of the Rx beam can be adj usted at the OTHERS
menu as below.
1. Press the [MENU] key to open the menu.
2. Select H-SCAN SETTING and press the [MENU] key.
3. Select OTHERS and press the [MENU] key.
MENU QUIT
H-SCAN SETTING QUIT
OTHERS
COLOR : COLOR 1
COLOR SETTING...
COLOR RESPONSE : COLOR CURVE 3
COLOR RESPONSE...
GAIN OFFSET : 0
SIGNAL LEVEL : 0
FAR TVG CURVE : TVG2
TVG DISTANCE...
SMOOTH ECHO RNG : 0
SMOOTH ECHO CIR : 0
BEAMWIDTH : 0
QUIT
Figure 2-15 OTHERS menu
2-15
2. HORIZONTAL MODE
4. Select BEAMWIDTH and press the [MENU] key to open the dialog box.
5. Use the trackball to select S (raise setting) or T (lower setting) as
appropriate and press the [MENU] key. The higher the setting the sharper
the horizontal resolution. AR means AUTO RANGE and it automatically
adjusts horizontal beamwidth according to the range. The setting range is –4
to 5 plus AR and the default setting is 0.
6. Select QUIT and press the [MENU] key to conclude.
7. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
QUIT
CANCEL
Figure 2-16 Numeric data entry dialog box
2.11 Tracking a Fi sh School (target lock)
The target lock function automatically tracks a f ish school so you won’t l ose sight
of it on the display. Two types of target lock are available: position (TARGET
MARK) and fish school (FISH) and you may select one fr om the menu as below.
Default setting is “FISH.” However, if the FSV-24 can not receive sufficient level
of echo, tracking may not be performed.
2.11.1 Selecting target lock type
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select INITITAL SETTING and press the [MENU] key.
4. Select YES and press the [MENU] key to confirm the CAUTION indicated.
5. Select TARGET LOCK and press the [MENU] key.
MENU QUIT
OTHERS
INITIAL SETTING
TARGET LOCK
TRACKING METHOD : FISH
INTERLOCK : TILT&RANGE
TRACKING DATA : H&V
THRESHOLD : 16
TARGET SPEED LIMIT : 5kt
SMOOTHING : 0.5
TARGET SPD UPDATE : 60sec
TARGET LOCK WINDOW : NORMAL
QUIT
QUIT
QUIT
2-16
Figure 2-17 TARGET LOCK menu
6. Select TRACKING METHOD and press the [MENU] key to open the dialog
box.
Figure 2-18 Target lock type dialog box
6. Use the trackball to select TARGET MARK or FISH as appropriat e and press
the [MENU] key.
7. Select QUIT and press the [MENU] key to conclude.
8. Select QUIT at the top of the menu screen and press the [MENU] key to quit
all menus.
2.11.2 Fish school mode
The automatic echo target lock function automatically tracks the
operator-selected fish school. When menu option INTERLOCK on the TARGET
LOCK menu (Figure 2-17) is set to TILT & RANGE, and the tracked fish school
goes out of the zone in the range direction, the range and tilt are automatically
controlled according to the fish school posit ion.
1. Select FISH at step 6 in the procedure in paragraph 2.11.1.
2. Use the trackball to select the fish school t o track on the horizontal display.
3. Press the [TARGET LOCK] key.
2. HORIZONTAL MODE
QUIT
CANCEL
TARGET MARK
FISH
The target lock mark appears (
) on the fish school with a vector extending
from its edge. This vector shows estimated target position after elapsed of
preset vector time. The target lock mark is also inscribed on the vertical
display, however no vector appears.
• If the target is lost , the tracking mode changes to position mode (see next
section) at that position.
• When the FSV- 24 detects and tracks the target again, the mode returns to
the fish school mode.
4. To turn off the target lock, press the [TARGET LOCK] key again.
Vector*
Target lock mark
Bearing mark
follows target
when target
lock is active.
Fish school's track*
* Turned on or off
from MARK DISPLAY
menu.
TARGET LOCK DATA
2975m (Horizontal range)
153m (Depth)
S
12.3kt (Speed)
C
256˚ (Course)
Figure 2-19 Target lock mark and target lock data
2-17
2. HORIZONTAL MODE
2.11.3 Position mode
This mode tracks a stationary position (such as a reef ) using position data fed
from a navigator.
ABCD
Depth
60° 60°
E
Figure 2-20 How position mode target lock works
1. Select TARGET MARK at step 6 in the procedure in paragraph 2.11.1.
2. Use the trackball to select the location to track.
3. Press the [TARGET LOCK] key to inscribe the target lock mark (
) at the
location selected. The target lock mark is also inscribed on the vertical
display.
Tilt, range and vertical bearing are automatically adjusted to t r ack the locat ion.
Using the figure above as an example, the target lock m ark is placed on location
E. Then, the equipment remembers the location of E and automatically changes
the tilt angle as the ship moves from position A through D. As long as the fish
school E is stationary its echo is kept displayed on the screen.
The position mode target lock works up to the tilt angle of 60° and the range
between 40 m and maximum range. If the tilt angle is exceeded, as it has in
position B and C in the above figure, for example, target position is considered
as dead in water, however position calculation continues. Once the tilt returns t o
within 60° target lock is resumed.
2-18
2.12 Detecting Fish Sch ools Aurally
Sometimes you may be preoccupied with other tasks and unable to concent rate
on watching the sonar picture. In such cases it would be a good cho ice to use
the audio function. This function enables you to monitor echoes from fish
schools and seabed through the built-in speaker.
After you’ve become accustomed to monitoring fish aurally, you should be able
to detect a fish school from a range longer than you ca n detect it on the screen.
In addition you may judge whether the f ish school is approaching or going away;
the tone becomes higher when the school is approaching and lowers when the
school is going away.
2.12.1 Selecting audio sector
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select FISH ALARM & AUDIO and press the [MENU] key.
2. HORIZONTAL MODE
MENU QUIT
QUITOTHERS
FISH ALARM & AUDIO
FISH ALARM : OFF
ALARM LEVEL : 16
ALARM ZONE...
AUDIO : ON
AUDIO SECTOR : 30°
REVERBERATION : 0
QUIT
Figure 2-21 FISH ALARM & AUDIO menu
4. Select AUDIO SECTOR and press the [MENU] key to open the dialog box.
QUIT
CANCEL
30°
60°
90°
180°
330°
Figure 2-22 Audio sector dialog box
5. Select desired audio sector among 30°, 60°, 90°, 180°, 330° and press the
[MENU] key.
6. Select QUIT and press the [MENU] key.
7. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2-19
2. HORIZONTAL MODE
2.12.2 Selecting direction
1. Operate the trackball to place the trackball mark on the direction you want to
monitor through the speaker.
2. Press the [R/B AUDIO] key.
The audio bearing mark appears on the bearing selected, in a 10°, 30°, 60°, 90°,
180° or 330° sector centering the audio bearing mark. Echoes are monitored
through the speaker. You can adjust speaker volume with the [AUDIO] control.
Note: When the trackball mark is placed near own ship m ark and the [R/B
AUDIO] key is pressed, the audio bearing mark, range mark and the
related data at the bottom of the screen are erased. Note that the audio
bearing is not erased when “AUDIO” on the FI SH ALARM & AUDI O menu
is turned on.
A
Figure 2-23 Range and audio bearing marks
2.12.3 Automatic training
You may automat ically scan the audio sector and audio bearing mark in the
sector of 12°, 24° or 36° as below.
1. First activate the range and audio bearing marks with the [R/B AUDIO] key.
2. While pressing and holding down the [AUTO TRAIN] key, press the [R/B
AUDIO] key to select desired auto train sector among 12°, 24°, 36° and OFF.
Watch the auto train mark to know the currently selected sector. The chosen
sector appears in large characters for five seconds at the top of the screen.
To turn off automatic training, select OFF at step 2.
Audio bearing mark
Range mark
R 400m
B 45˚
Range and audio bearing
marks data
Auto train mark
2-20
Auto train sector
A
Audio bearing
mark
Figure 2-24 Auto train mark
2.12.4 Reverberation
You may choose the length of reverberation for the audio signal. The larger the
value the longer the reverberation, which makes it easer to hear the audio signal.
The setting range is 0-9 and the default setting is 0.
2.13 Presentation Mode
This sonar has four presentation modes, head-up, north-up, Course-up and true
motion, and you may select one with PRESENTATION MODE in the OTHERS
menu.
2. HORIZONTAL MODE
N
N
Head-up
North-up True Motion
Figure 2-25 Presentation modes
2.13.1 Presentation mode description
Head-up: The display is oriented toward ship’s heading. Own ship position is
fixed at the screen center. Echoes from fish and the bottom move on the screen
relative to own ship’s movement. This mode is useful for general use.
North-up: The display is oriented so North is at the top of the screen. Own ship
position is fixed at the screen center and own ship m ark pivots with ship’s
movement. Echoes from fish and the bottom move on the screen relative to own
ship’s movement.
Course-up: The display is oriented according to course. Own ship position is
fixed at the screen center. Echoes from fish and the bottom move on the screen
relative to own ship’s movement. Targets are displayed at ship’s bow.
N
Course-up
N
True Motion: Stationary objects are fixed and own ship and fish echoes move
on the display in accordance with their true courses and speeds. Thus you can
observe own ship and fish echo movement with respect to the bottom. This
mode requires speed and heading data. W hen own ship mark reaches an edge
of the off-center effective area it is automatically returned to the screen cent er as
below.
2-21
2. HORIZONTAL MODE
N
Offcenter
effective area
(a) Own ship mark reaches
an edge of offcenter
effective area
(b) Own ship mark is automatically
returned to screen center
Figure 2-26 Automatic return of own ship mark in true motion
2.13.2 How to select a presentation mode
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select DISPLAY SETTING and press the [MENU] key.
MENU
OTHERS
DISPLAY SETTING
DISPLAY MODE...
MODE SELECTION : MODE KEY
PRESENTATION MODE :HEAD UP
TM DISPLAY RANGE : 1.6R
BEARING REF : SHIP HEADING
H-SLICE WIDTH : 16
H-SLICE PICT ADVC : KP SYNC
NET COURSE MARK : ENTER
MANUAL DEGAUSS : EXECUTE
AUTO DEGAUSS : INT SENSOR
DIMMER : 10
KEY BEEP VOLUME : 5
N
QUIT
QUIT
QUIT
2-22
Figure 2-27 DISPLAY SETUP menu
4. Select PRESENTATION MODE and press the [MENU] key to open the
dialog box.
QUIT
CANCEL
HEAD UP
NORTH UP
COURSE UP
TRUE MOTION
Figure 2-28 Presentation mode dialog box
5. Select presentation mode desired and press the [ MENU] key.
6. Select QUIT and press the [MENU] key.
7. Select QUIT at the top of the menu screen and press the [MENU] key to quit
all menus.
Note: The true motion display range may be set to 1.3 or 1.6 times the range
with TM DISPLAY RANGE on the DISPLAY SET TING sub menu.
2.14 Fish Alarm
The fish alarm sounds the aural alarm when a fish echo above a preset strength
enters the operator-set alarm zone.
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select FISH ALARM & AUDIO and press the [MENU] key.
2. HORIZONTAL MODE
MENU
OTHERS
FISH ALARM & AUDIO
FISH ALARM : OFF
ALARM LEVEL : 16
ALARM ZONE...
AUDIO : ON
AUDIO SECTOR : 30°
REVERBERATION : 0
QUIT
QUIT
QUIT
Figure 2-29 FISH ALARM & AUDIO menu
4. Select FISH ALARM and press the [MENU] key to open the dialog box.
QUIT
CANCEL
OFF
ON
Figure 2-30 Fish alarm status dialog box
5. Select ON, select QUIT and then press the [MENU] key.
6. Select ALARM ZONE and press the [MENU] key.
7. Operate the trackball to place the tr ackball mark on the starting point of the
alarm zone.
8. Press the [MENU] key.
9. Rotate the trackball clockwise to select the ending point. The display paints a
fan-shaped alarm zone.
10.Press the [MENU] key.
11. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2-23
2. HORIZONTAL MODE
Note 1: There must be at least three degrees difference between the starting
and ending points to get a fan-shaped alarm zone as shown in (a) and
(b) below. Otherwise, the unit paints a 360-degree alarm zone as in (c)
where there is less than 3 degrees between the start ing and ending
points and (d) where the bearing marker has been rotated one full turn.
<<ALARM ZONE SETTING>>
PLACE CURSOR AT STARTING POINT
AND PRESS MENU KEY TO SET.
PRESS R/B KEY TO CANCEL.
<<ALARM ZONE SETTING>>
PLACE CURSOR AT ENDING POINT
AND PRESS MENU KEY TO
COMPLETE ALARM ZONE SETTING.
Figure 2-31 How to set the fish alarm zone
More than 3˚
(a) (b) (c) (d)
Within 3˚
Figure 2-32 How to create desired alarm zone
Note 2: The echo strengt h which triggers the alarm can be set with ALARM
LEVEL on the FISH ALARM & AUDIO menu.
2-24
2. HORIZONTAL MODE
2.15 Relocating Fish School for Easy Observation
Use the offcenter feature to relocate a fish school.
1. Operate the trackball to place the trackball mark on the position where you
want to relocate the own ship mark.
2. Press the [OFF CENTER] key.
3. To move the own ship mark back to the screen center, press the [OFF
CENTER] key again.
Fish school
Fish
Press OFF CENTER key
Own ship
mark
school
Set trackball
mark here,
for example.
Own ship mark
moves to trackball
mark position.
Figure 2-33 How to use offcenter
2-25
2. HORIZONTAL MODE
2.16 Comparing Fish School Concentration
You can get an estimate of the volume of two fish schools by using the two
ESTIMATE keys as follows:
1. Operate the trackball to place the trackball mark on a fish school, and then
press the [ESTIMATE 1] key.
The estimate mark appears on the fish school. Relati ve vol ume is shown by
a figure between 0 and 100, below the estimate mark. When the area inside
the mark is filled in reddish brown, volum e f igure is said to be “100”.
2. Operate the trackball to place the trackball mark on another fish school and
press the [ESTIMATE 2] key.
3. Compare estimate figures for each fish school by observing estimate mark
data and the fish histogram.
4. To turn off the estimate marks press their respective keys.
Estimate mark 2
North
mark
Estimate
mark 1
N
2
1
W
85
75
HEADING
SHIP COURSE
SHIP SPEED
LAT/LONG[DGPS]
DEPTH
WATER CURRENT
NET DEPTH
E
1
32°52.150N
°
132
321m
C1 1.2kt 342
C2 0.8kt 298
C3 0.4kt 256
S1 134m
NAV
S2 178m
S3 213m
DATA
SCAN
DISPLAY
12.5kt
12.150E
321
°
335
°
°
°
°
2
SCAN
2000
S
WATER TEMP
12
10
8
10.3°C
01020MIN
Estimate mark 2 data
Estimate mark 1 data
Figure 2-34 Estimate marks and their data
2-26
2.17 Measuring F i sh School Speed
To ensure a good haul, it is im portant t o estimate the direction and speed of the
fish school before shooting the net. You can do this with the [FISH] key. With
tidal current data plus fish speed data, you can determine the timing of the net
shooting more efficiently. T his function requires speed and heading data.
2.17.1 Entering fish marks
1. Place the trackball mark on the center of a f ish school, and t hen press the
[FISH] key. The latest fish mark (
2. Wait 1 to 2 minutes.
3. Place the trackball mark on the same fish school selected in step 1 and
press the [FISH] key. The latest fish mark appears on the target, the 2nd
latest fish mark (
) appears on the location selected at step 1 and any
earlier fish marks are shown with an “X”. The distance between the two fish
marks and fish school course and speed appear at the bottom right-hand
corner of the horizontal display area.
) appears on the fish school.
2. HORIZONTAL MODE
Latest fish
mark
Earlier fish mark (max. 8)
2nd latest fish mark
Latest
fish mark
WAIT 1-2
MINUTES
Place trackball mark
on a fish school and
press [FISH] key.
X
Place trackball mark
on fish school's current
location and press
[FISH] key again.
FISH MOVEMENT DATA
(Horizontal range to fish mark)
2975m (Distance moved)
153m (Depth)
S 12.3kt (Speed)
C 256˚ (Course)
Figure 2-35 How to measure fish school speed
Note 1: Fish movement is calculated using ship’s speed and heading data.
Accordingly, pit c hing and rolling may affect the calculation. For best
results, try the procedure two or three times to verify reliability.
Note 2: The time and distance between pressings of the [FISH] key should be
as long as possible to increase accuracy of measurement. For best
results, repeat the procedure two or three times.
Note 3: Each time the [ FIS H] key is pressed the latest fish mark and ship’s
speed mark change in the sequence shown belo w.
2-27
2. HORIZONTAL MODE
This data is the latest fish
mark data.
[FISH]
key pressed once
2.17.2 Deleting fish marks
Fish marks can be deleted individually with the [DELETE MARK] key or by
earliest entry through the menu. Note that [DELETE MARK] key also erases
event marks.
Deleting fish marks with the [DELETE MARK] key
Use the trackball to place the trackball mark on the fish mark you want to erase.
The color of the fish mark changes from white to red when the fish mark is
correctly selected. Press the [DELETE MARK] key to delete the fish mark.
Deleting fish marks through the menu
twice
three times
four times
Figure 2-36 Fish mark
1. Press the [MENU] key to show the menu.
2. Select OTHERS and press the [MENU] key.
3. Select ERASE MARKS and press the [MENU] key.
MENU QUIT
QUITOTHERS
ERASE MARKS
EVENT MARK : DELETE
FISH MARK : DELETE
OWN SHIP POS MARK: DELETE
SHIP'S TRACK : DELETE
QUIT
Figure 2-37 ERASE MARKS menu
4. Select FISH MARK and press the [MENU] key. Each press of the [MENU]
key deletes the earliest fish mark.
5. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2-28
2. HORIZONTAL MODE
2.18 Event Mark, Own Ship Position Mark
The event mark is useful for finding the horizontal range, depth and bearing to a
location some distance from current position. 10 such marks may be inscribed
on the horizontal display. This function requires speed and heading data.
There are two types of event marks, latest event mark (
Each time an event mark is entered the latest event mark appears at the
trackball mark position and all other event marks are shown by the “plus” (+)
mark and numbered in sequential order. When the memory capacity for event
marks is reached the earliest event mark is automatically erased to make room
for the latest.
The own ship mark (
) is used to mark current position.
2.18.1 Entering an event mark
⊕) and event mark (+).
1. Set the trackball mark where you want to place an event mark.
2. Press the [EVENT] key. The horizontal range, depth and bearing to the event
mark appear at the bottom left corner of the horizontal display area.
→234: Horizontal range (m) from own ship mark
↓19: Present depth (m) to mark
(35): Depth (m) of mark at moment EVENT key is pressed.
B265: Present bearing (degree)
Bottom left-hand corner of the screen
Figure 2-38 Event mark data
With speed and heading data the mark follows own ship’s movements. In the
True Motion mode, the event mark is stationary. When the tilt angle is changed
mark position changes with slant range. Note ho wever that the mark’s position
does not change when automatic tilt is active; the tilt center angle is used to
position the mark.
Plotting an event mark on the display is equi val ent to dropping a buoy with an
anchoring chain that extends from surface to bottom. The buoy is fixed at its
geographical location, but the marker on the display moves to a point where
present beam plane intersects the anchor chain of the buoy as ship moves or
the tilt angle is changed. This can be said about m arks as well such as fish mark
and trackball mark.
2-29
2. HORIZONTAL MODE
You observe picture from
direction of ò mark.
B
A
Figure 2-39 Event mark description
2.18.2 Entering an own ship position mark
Place the trackball mark close to the own ship mark and press the [EVENT] key.
Ten own ship position marks may be inscribed. When the capacity for own ship
position marks is reached the earliest own ship posit ion mark is automatically
erased.
(35)
Stored when
EVENT key is
pressed.
2.18.3 Erasing an event mark, own ship position mark
Event marks and own ship position marks can be deleted indi vidually with the
[DELETE MARK] key or by earliest entry through the menu.
Deleting event marks, own ship position mark with the [DELETE MAR K]
key
Use the trackball to place the trackball mark on the event mark or own ship
position mark you want to erase. The color of the mark changes from white t o
red when the mark is correctly selected. Press the [DELETE MARK] key to
delete the mark.
Deleting event marks, own ship position mark through the menu
1. Press the [MENU] key to show the menu.
2. Select OTHERS and press the [MENU] key.
3. Select ERASE MARKS and press the [MENU] key.
MENU QUIT
QUITOTHERS
ERASE MARKS
QUIT
2-30
EVENT MARK : DELETE
FISH MARK : DELETE
OWN SHIP POS MARK: DELETE
SHIP'S TRACK : DELETE
Figure 2-40 ERASE MARKS menu
4. Select EVENT MARK (or OWN SHIP POS MARK) and press the [MENU] key.
Each pressing deletes the earliest event mark (or own ship position m ark).
5. Select QUIT at the top of the menu screen and press the [MENU] key to quit
all menus.
2.19 Net Course M ark
Before shooting the net, decide the shoot t iming considering tide direction,
distance to the fish school and moving direction of t he fish school. Use the net
course mark as a guide to decide the timing. This function requires speed and
heading data.
2.19.1 Inscribing the net course mark
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select DISPLAY SETTING and press the [MENU] key.
2. HORIZONTAL MODE
MENU
OTHERS
DISPLAY SETTING
DISPLAY MODE...
MODE SELECTION : MODE KEY
PRESENTATION MODE :HEAD UP
TM DISPLAY RANGE : 1.6R
BEARING REF : SHIP HEADING
H-SLICE WIDTH : 16
H-SLICE PICT ADVC : KP SYNC
NET COURSE MARK : ENTER
MANUAL DEGAUSS : EXECUTE
AUTO DEGAUSS : INT SENSOR
DIMMER : 10
KEY BEEP VOLUME : 5
QUIT
QUIT
QUIT
Figure 2-41 DISPLAY SETTING menu
4. Select NET COURSE MARK and press the [MENU] key. Instruct ions for
setting the net course mark appear on the display.
Net course mark
<<NET SHOOT SETTING>>
PLACE NET SHOOT CIRCLE BY
TRACKBALL AND PRESS MENU KEY TO SET.
PRESS R/B KEY TO CANCEL.
Figure 2-42 Net course mark
5. Use the trackball to position the net course mark, which is shown by a
dashed circle.
6. Press the [MENU] key to set, and the dashed circle changes to a solid one.
7. Select QUIT at the top of the menu screen and press the [MENU] key to quit
all menus.
2-31
2. HORIZONTAL MODE
2.19.2 Deleting the net course mark
Repeat the procedure in 2.19.1.
2.20 Observing Net Behavior
With net sonde connection you can observe net behavior after the throwing of
the net. Accurate depiction of net sonde position depends on proper setting of
the distances between net sonde transm itters. You can set those distances on
the NET SONDE SETTNG menu.
This function requires speed and heading data.
1. Press the [SHOOT] key just upon throwing the net into the water. The
following actions occur:
• Net shoot mark (
• Net shoot data appears.
• Net sonde mark is inscribed.
• Net depth data is displayed.
• Water depth data and water temperature data erased from own ship’s
track.
• In an ES combination mode, tide data and net depth replace the water
temperature graph.
• In an ES combination mode, the picture advance method changes to
“speed sync.”
• In an ES combination mode, the picture advance width appears on the ES
display.
2. To erase the net sonde mark and associat ed data, press the [SHOOT] key
again.
) appears at own ship position.
2-32
B 296
W
202m
193m
59m
NET SHOOT DATA
Distance run from shooting of net
Time elapsed from shooting of net
2
150
2000
N
2
1
3
1
2
2
3
3
1
2
S
0.53NM
5:32
1
2. HORIZONTAL MODE
N-UP
R 300m
AUTO
17T
(21 )
G10
P 8
85
E
1
1
1
1
3
HEADING
SHIP COURSE
SHIP SPEED
[DGPS] (000.000)
LAT/LONG[DGPS]
32 52.150N
132 12.150E
132
DEPTH
WATER CURRENT
C1 1.2kt 342
C1 1.2kt 342
C2 0.8kt 298
C2 0.8kt 298
C3 0.4kt 256
C3 0.4kt 256
NET DEPTH
S1 134m
S1 134m
NAV
S2 178m
S2 178m
S3 213m
S3 213m
DATA
DISPLAY
1 Scan
WATER CURRENT*
C1 1.2kt 342°
C2 0.8kt 298°
12
C3 0.4kt 256°
NET DEPTH*
10
S1 134m
S2 178m
8
S3 213m
321
335
12.5kt
12.5kt
32°52.150N
°
12.150E
321m
321m
10.3 C
321
°
335
°
°
°
°
01020min
Net sonde mark
Figure 2-43 Net behavior
2.21 Storing, Recalling Picture
The current picture can be stored in the memory, and recalled whenever desired.
This feature is useful for analyzing echoes.
2.21.1 Storing the picture
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select PRESET, MEMORY CARD and press the [MENU] key.
MENU QUIT
OTHERS
PRESET, MEMORY CARD
ASSIGN USER PROG : EXECUTE
CLEAR F-KEY SETTING...
H-SCAN RANGE
V-SCAN RANGE
PICTURE SHOT : EXECUTE
PICTURE RECALL : EXECUTE
MEMORY CARD...
Net shoot mark
QUIT
QUIT
Figure 2-44 PRESET, MEMORY CARD menu
2-33
2. HORIZONTAL MODE
4. Select PICTURE SHOT and press the [MENU] key.
5. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2.21.2 Recalling stored picture
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select PRESET, MEMORY CARD and press the [MENU] key.
4. Select PICTURE RECALL and press the [MENU] key to recall the picture
stored in the memory.
5. Press the [MENU] key to erase the message displayed.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
2.22 H-SCAN SETTING Menu Overview
This section presents an overview of the H-SCAN SETTING menu.
2.22.1 Displaying the H-SCAN SETTING menu
1. Press the [MENU] key to open the menu.
2. Select H-SCAN SETTING and press the [MENU] key.
MENU QUIT
H-SCAN SETTING
TX INTERVAL
TX PULSE LENGTH
TX POWER
TVG-NEAR
TVG-MEDIUM
TVG-FAR
NOISE LIMITER
AGC
2ND AGC
ECHO AVERAGE
INT REJECT
QUIT
: 9
: 9
: 9
: 0
: 0
: 0
: 2
: 0
: 0
: 0
: 0
2-34
FREQ SHIFT : 1
OTHERS...
Figure 2-45 H-SCAN SETTING menu
3. Select OTHERS and press the [MENU] key.
MENU QUIT
H-SCAN SETTING QUIT
OTHERS
COLOR : COLOR 1
COLOR SETTING...
COLOR RESPONSE : COLOR CURVE 3
COLOR RESPONSE...
GAIN OFFSET : 0
SIGNAL LEVEL : 0
FAR TVG CURVE : TVG2
TVG DISTANCE...
SMOOTH ECHO RNG : 0
SMOOTH ECHO CIR : 0
BEAMWIDTH : 0
QUIT
Figure 2-46 OTHERS sub menu
2. HORIZONTAL MODE
2.22.2 H-SCAN SETTING menu description
TX IN TERVAL: Changes Tx interval. For further details see "2.9.3 Changing TX
interval" on page 2-14.
TX PULSELENGTH: Chooses Tx pulselength. For further details see “2.7.2 By
decreasing pulselength” on page 2-11.
TX POWER: Selects TX power. For further details see “2.8 Suppressing Bottom
and Sea Surface Reflections in Shallow” on page 2-12.
TVG-NEAR,-MEDIUM,-FAR: Adj ust TVG level. For further details see “2.6
Eliminating Weak Echoes” on page 2-8.
NOISE LIMITER: Suppresses weak unwanted reflections. For further details see
“2.9.5 Noise limiter” on page 2-15.
AGC: Suppresses bot tom echo tail. For further details see “2.7.1 AGC” on page
2-10.
nd
AGC: Suppresses bottom echo tail. For further details see “2.7.3 2nd AGC”
2
on page 2-11.
ECHO AVERAGE: Adjusts echo afterglow, which can be useful for watching
echo movement. The setting range is 0-3 and the default setting is 0. The higher
the number the longer echoes remain on t he screen.
INT REJECT: Rejects interference from other sonars. For further details see
“2.9.2 Interference rejector” on page 2-13.
FREQ SHIFT: Shifts transmitting frequency to suppress interference from other
sonars. 2.9.4 Shifting Tx frequency on page 2-14.
OTHERS: See top of next page.
2-35
2. HORIZONTAL MODE
OTHERS sub menu
COLOR: Select color arrangement to use. The default set ting is COLOR 1.
COLOR SETTING…: Customizes colors.
1. Select COLOR SETTING from the OTHERS menu and press the [MENU]
key. The following dis play appears.
2. Use the trackball to select color to change and press the [ MENU] key.
Choose to register setting
and close menu.
Choose to cancel change.
Choose to restore
default colors.
H-SCAN COLOR 1
QUIT
CANCEL
DEFAULT
QUIT
HUE
27
SAT84LUM
53
CANCEL
HUE: Adjusts color tint (Setting range: 0-100%).
SAT (Saturation): Adjusts color vividness
(Setting range: 0-100%).
LUM (Luminescence): Adjusts color brightness
(Setting range: 0-100%).
Figure 2-47 COLOR SETTING menu
Choose to quit.
Choose to cancel.
3. Select S or T of item HUE, SAT or LUM.
4. Press the [MENU] key to change the setting.
5. Repeat steps 3 and 4 to change level of other items.
6. Select QUIT and press the [MENU] key to conclude.
7. Repeat steps 2-6 to change other colors.
8. Select QUIT at the top of the menu and press the [MENU] key
9. Select QUIT at the top of the menu screen and press the [MENU] key to
finish.
Note: If you get lost in operation and want to return to default colors, select
DEFAULT and press the [MENU] key.
COLOR RESPONSE: Color response defines reflected echo strength versus
color level conversion. You can select one of four color response tables, and the
default setting is COLOR RESPONSE 3.
2-36
2. HORIZONTAL MODE
COLOR RESPONSE…: Adjusts reflected echo strength versus echo color level
for currently selected color response number.
To adjust the curve, place the trackball at t he point desired and press the
[MENU] key. On the horizontal axis input level relative value is shown in the
range from 0 to 100%. The setting range for input level is 0-100% in increments
of 10% and output level is 0-100% in any valu e.
To set input level versus output level, use the trackball to
place the trackball mark on location desired and press the
[MENU] key.
H-SCAN COLOR
100
80
60
40
20
0
DEFAULT CANCEL QUIT
DEFAULT: Select to restore default
setting for selected color response.
CANCEL: Select to cancel change.
QUIT: Select to finish.
Currently selected color
10080604020
Input level scale
Figure 2-48 Color response curve
GAIN OFFSET: Adjusts gain level. If the front panel [GAIN] control does not
provide satisfactory gain adjustment, enter an offset here. The default setting is
0 and the setting range is 0-12.
SIGNAL LEVEL: Dirty water or reflections from plankton may be painted on the
screen in green or light-blue. These echoes may be erased in order of strength.
Select the signal level to erase with the trackball and press the [ MENU] key. The
setting range is 0-15 and the default setting is 0.
FAR TVG CURVE: Selects the TVG curve to use. TVG2 is the default TVG
curve.
2-37
2. HORIZONTAL MODE
TVG DISTANCE: Sets the TVG effective distance for near, medium and far
ranges.
Setting range
NEAR: 50-150 m, 10 m increments, default setting 100 m
MED: 300-500 m, 20 m increments, default sett ing 400 m
FAR: 600-1000 m, 40 m increments, default setting 800 m
To adjust a TVG curve, select S or T of item desired and press the [MENU] key
to change the setting.
Select to register
setting and finish.
QUIT
Quit
NEAR
100
MED
400
Select item with trackball
and press [MENU] key to
change setting.
FAR
800
CANCEL
Cancel
Select to cancel
change.
Figure 2-49 TVG setting window
SMOOTH ECHO RNG: Selects echo smoothing level in the range direction. The
setting range is 0-3 and the def ault setting is 0. The higher the setting the
greater the smoothing.
SMOOTH ECHO CIR: Selects echo smoothing level in circular direction. The
setting range is 0-3 and the def ault setting is 0. The higher the setting the
greater the smoothing.
BEAMWIDTH: Adjusts horizontal beamwidth. For further details see “2.10
Adjusting Beamwidth” on page 2-15.
2-38
2.23 Interpreting the Ho rizo ntal Display
This section provides information necessary for interpret ing the horizontal
display.
2.23.1 Sample echo displays
Bottom echoes
When the tilt angle is changed, the bottom echo illustrated below will appear on
the display. When the tilt is decreased (toward 0°), the bot tom trace becomes
wider and weaker. By observing the bottom condition on the display, the skipper
can prevent net damage.
(A) Flat bottom
Tilt angle: 10˚ to 15˚
Decreased tilt angle
Only half of
vertical beam width
captures the bottom.
2. HORIZONTAL MODE
(B) Flat bottom
Tilt angle: 20˚ or more
(C) Sloping bottom
Tilt angle: 20˚ or more
Bottom is displayed
narrower and in
stronger colors when
compared to (A).
Shallow bottom
is displayed in
a strong color
and with a
short tail.
Bottom
The deeper, sloping
bottom echo is displayed
in a weak color and
with a long tail.
Figure 2-50 Bottom echoes
2-39
2. HORIZONTAL MODE
Fish schools
A fish school appears as a mass of echoes on the screen. The color of the m ass
shows the density of fish schools on the sonar beam. To find distribution and
center point of a fish school, try several different tilt angles.
(A) Sea surface fish
Tilt angle: 0˚ to 10˚
Fish
school
Sea surface
reflections
Bottom echo not
displayed because
of decreased tilt angle.
Sea surface
reflections are
present.
(B) Midwater, bottom fish
Fish echo which appears before bottom can be detected.
Tilt angle: 0˚ to 20˚
Fish echo which appears together with
or after bottom can be detected.
Tilt angle: 30˚ or more
Bottom
Fish
school
Large midwater
fish school is
present.
Fish
school
Bottom
2-40
When the tilt angle is shallow,
the reflection echo from bottom
is weak and the fish echo
which appears from bottom
is easy to find.
Figure 2-51 Fish schools
Sea surface reflections
2. HORIZONTAL MODE
To reduce sea surface reflections, set the tilt angle to 5
° or higher, so the upper
edge of the sonar beam does not hit the sea surface, or adjust TVG. When a
decreased tilt angle is used, sea surface ref lections cover a large area as
illustrated below.
Tilt: 0˚
Tilt: 5-6˚
Sea surface
12˚
Sea surface
12˚
Tilt angle
indication
Sea surface
reflections
Figure 2-52 Sea surface reflections
Wake
A wake produced by own ship or another ship can be a strong reflecting object
when a decreased tilt angle is used. As the wake appears as a thick continuous
line, it can be easily distinguished from a fish school. A wake contains many air
bubbles which attenuate ultrasonic en ergy, making it difficult to sound beyond
the wake.
Own
ship
Other
ship
Own ship's
screw noise
Wake produced
by other ship
Figure 2-53 Wake
Own ship's
screw noise
Own ship's wake
(produced when
own ship turned)
2-41
2. HORIZONTAL MODE
Sidelobe echoes (false echoes)
An ultrasonic wave is emitted only in the direction set by the [TILT] control,
however there are some emissions outside the main beam. These are called
sidelobes. The energy of the sidelobe is fairly weak but when the water is
comparatively shallow and the bottom is rocky and hard, strong signals are
detected by the sidelobe. These are represented on the display as a false echo
as shown below.
Mainlobe echo
Sidelobe
Mainlobe
Sidelobe echo
The bottom echo
detected by sidelobe
appears at a certain
tilt angle when the
sidelobe points vertically. Also, poor
soundome projection
may result in a similar
false echo.
Figure 2-54 Sidelobe echoes
Noise and interference
When the fishing ground is crowded with many fishing boats, the sonar is subject
to interference from ultrasonic equipment (echo sounder or sonar) on other
boats as well as those on own ship.
For instance, interference from the sonar operated on ot her boats will show itself
on the display as in (A) in the figure below. This interference can be suppressed
by changing the TX INTERVAL on the H-SCAN SETTING menu. Noise fr om
marine life shows itself on the displays as in (B) in the figure below. This type of
noise can be suppressed with the interference rejector on the H-SCAN
SETTING menu.
2-42
(A) Inteference from (B) Interference from
other sonars (yours marine life
or other's)
Figure 2-55 Noise and interference
3. VERTICAL MODE
3.1 Basic Operating Procedure
4.
Select vertical 1 or vertical 2 display.
2.
Lower transducer.
1.
Turn on power.
3.
Adjust display brilliance.
6.
Press appropriate key.
8.
Select range.
9.
Adjust gain.
7.
Press to select vertical display if necessary.
Figure 3-1 Control unit
5.
Set vertical
bearing mark to
display in vertical
display.
3-1
3. VERTICAL MODE
3.2 Vertical Mode Indications and Marks
The vertical mode provides a vertical section of the horizo ntal picture. You may
show the display on the right or left side of the screen in case of t he vertical 1
mode. An expansion mode is available to enlarge the picture. To display the
vertical mode press the [MODE] key.
Vertical bearing mark
(See next page.)
Trackball data
Slant range
Horizontal range
Vertical range
Angle to trackball
mark from
horizontal
Trackball mark
position reference
mark
(See page 3-3.)
A 33˚
W
500
1000
R 2000m
8
G
V 12˚
1547m
1473m
473m
500
1000 1500
N
V
2000
S
Tilt mark
(Shows tilt angle set
on horizontal display.)
E
NAV
DATA
DISPLAY
Range scale
(Displays horizontal
range and depth.
Grid inscribed
in increments
of 1/4 of the range
in use.)
VERTICAL SCAN DATA
Range
Gain
Bearing
(Appears only in vertical 1
display; vertical scan data is
common to both vertical 1
and vertical 2 displays.)
Figure 3-2 Vertical 1 display indications and markers
500
1000
R 2000m
R 2000m
G 8
G8
V 256
V 12˚
500 1000
500
1000
Bottom echo
Target lock mark
(Entered on
horizontal display.)
1500
Trackball mark
3-2
3.2.1 Vertical bearing mark, tilt mark
The vertical bearing mark is displayed with solid and dashe d lines and it shows
the bearing selected on the horizontal display. The circle at the top of the vertical
bearing mark has a “V” inside of it in the vertical 1 mode, or “1” and “2” as
appropriate when both the vertical 1 and vertical 2 modes are active. Its bearing
may be referenced to North (true) or ship’s heading (relative, default setting) on
the menu.
The tilt mark is a solid and dashed line which sho ws in the vertical display the tilt
angle set on the horizontal display.
The meaning of the solid and dashed lines are as shown in the table below.
Solid Line Dashed Line
3. VERTICAL MODE
Vertical Bearing Mark Ra nge from own ship to
vertical scan range
Tilt Mar k Range from own ship to
horizontal scan range
V = Vertical 1
1, 2 = Vertical 1, Vertical 2
V
VR
Vertical bearing mark
Tilt angle
VR
Tilt mark
HR = Horizontal Range
VR = Vertical Range
Range further than vertical
scan range
Range further than
horizontal scan range
HR
HR
Tilt mark
Figure 3-3 Vertical scan and horizontal scan ranges
3-3
3. VERTICAL MODE
3.2.2 Trackball mark position reference mark
The trackball mark position reference mark, a solid circle, is inscribed on the
vertical bearing mark when the trackball mark is placed in the vertical display. Its
purpose is to show corresponding trackball mark position on the horizontal
display. I t changes position with trackball mark position, tilt and range, and
disappears when its position is no longer within the range of the horizontal
display.
V (Vertical 1), or
1 or 2 (Vertical 2)
Trackball
mark position
reference
mark
V
Figure 3-4 Vertical bearing mark, trackball mark position reference mark
.
3.3 Vertical Mode Concept
The vertical mode shows a vertical section of the horizontal displa y sele cted with
the vertical bearing mark. The figure below illust r ates the concept of the vertical
mode, in comparison with the horizontal mode. The vertical mode helps you
keep fast moving fish such as bonito and tuna within the sonar beam.
VERTICAL
DISPLAY
Vertical
bearing
mark
Tilt mark
Trackball mark
Horizontal Mode Vertical Mode
H-Beam
V- Beam
Figure 3-5 Vertical mode concept
3-4
3. VERTICAL MODE
3.4 Setting the Vertical Bearing Mark, Auto Train
3.4.1 Setting th e vertical b earing mark
1. Use the trackball to place the trackball m arker at the desired locat ion in the
horizontal display.
2. Press the [V1] or [V2] key.
For example, press the [V1] key. Then, the Vertical 1 display appears, and the
vertical bearing marker is displayed in the horizontal display, with “V” at the tip of
the marker. If both vertical displays are activated, “1” or “2” is inscribed at the tip
of a vertical bearing marker.
3.4.2 Auto train
You may scan the vertical beari ng mark in the sector of OFF, ±12°, ±24° and
±36°.
1. Press and hold down the [AUTO TRAIN] key while pressing the [V1] or [V2]
key to choose auto train sector desired. Selected sector appears in larg e
characters for five seconds for your confirmation. The auto train starts.
Auto train mark
Auto train sector
1
Vertical bearing
mark
Figure 3-6 Auto train
2. To quit the auto train, set OF F at the step 1.
3-5
3. VERTICAL MODE
3.5 Display Range
The [RANGE] control selects the detection range. The range selecte d is
momentarily displayed in large characters at the center of the vertical 1 display.
Range is always displayed at the lower left-hand corner of the vertical 1 display.
Below are the default ranges (in meters).
Range Setting 1 2 3 4 5 6 7 8
Range 200 400 600 1000 1600 2000 3000 4000
1. Press the [H/V] key to show the gain and range indications of the vertical
mode in yellow.
2. Operate the [RANGE] control to select desired range.
Note: Ranges may be preset as desired on the PRESET, MEMORY CARD
menu. For further details, see V-SCAN RANGE on page 8-5.
3.6 Measuring the Range
Operate the trackball to place the trackball mark on the vertical 1 (or vertical 2)
display. The range t o t he location selected is shown at the top left corner.
Trackball data
Slant range
Horizontal range
Vertical range
Angle to trackball
mark from horizontal
Trackball mark
position
A 33˚
W
500
1000
R 2000m
8
G
V12˚
1547m
1473m
473m
500
34°56.789N
123°45.678E
1000
N
V
NAV
E
DATA
DISPLAY
1500
2000
S
3-6
Trackball mark
Figure 3-7 Measuring range with the trackball
3.7 Eliminating Weak Echoes
Echoes from targets such as bottom and fish return to the transducer in order of
distance to them, and when we compare their intensities at the tr ansducer face,
those from nearer targets are generally stronger when their reflecting propert ies
are nearly equal. The sonar operator will be quite inconveni enced if these
echoes are directly displayed on the screen, sin ce he can not judge the actual
size of the target from the size of echoes displayed on t he screen. To overcome
use the TVG function. It compensates for propagation loss of sound in water;
amplification of echoes on short range is suppressed and gradually increased as
range increases so that similar targets are displayed in the similar intensities
irrespective of the ranges to them.
The FSV-24 has three TVG functions, NEAR, MEDIUM and FA R, and they
mainly compensate for propagation loss on short, middle and long ranges
respectively, cent ered at the ranges as shown in Figure 2-9 on page 2-8. The
higher the TVG setting the greater the amplification of echoes.
The TVG is also used to suppress unwanted echoes and noise which appear in
a certain range area on the screen such as sea surface reflections and cruising
noise. To set TVG properly, do the following:
1. Press the [MENU] key to open the menu.
3. VERTICAL MODE
MENU QUIT
TX PULSE LENGTH-H : 9
TX POWER-H : 9
TVG-NEAR-H : 0
TVG-MEDIUM-H : 0
TVG-FAR-H : 0
AGC-H : 0
2ND AGC-H : 0
ECHO AVERAGE-H : 0
COLOR-H : COLOR 1
COLOR RESPONSE-H : COLOR CURVE 3
H-SCAN SETTING...
V-SCAN SETTING...
OTHERS...
Figure 3-8 Menu
2. Select V-SCAN SETTING and press the [MENU] key.
3-7
3. VERTICAL MODE
MENU QUIT
V-SCAN SETTING
QUIT
TX PULSE LENGTH
TVG-NEAR
TVG-MEDIUM
TVG-FAR
NOISE LIMITER
AGC
ECHO AVERAGE
INT REJECT
OTHERS...
: 7
: 0
: 0
: 0
: 2
: 0
: 0
: 0
Figure 3-9 V-SCAN SETTING menu
3. Select TVG-NEAR with the trackball and press the [MENU] key.
QUIT
CANCEL
Figure 3-10 TVG setting dialog box
4. Use the trackball to select S (raise setting) or T (lo wer setting) and press
the [MENU] key. The set t ing range is –5 to 5 and the default setting is 0. The
higher the setting the further the TVG works.
5. Select QUIT and press the [MENU] key to conclude.
6. Repeat steps 3 and 4 to set TVG-MEDIUM and TVG-FAR.
When sea surface reflections or plankton layers disturb t he pict ure, decrease
appropriate TVG option by one or two steps.
7. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
W hen a fish school is located on a long range setting (about 800 met ers) and
is approaching own ship do as follows:
Adjust the tilt to keep the fish school in the center of the sonar beam, namely,
fish school is displayed in strongest colors possible. Confirm that the fish
echo is displayed in the same color as it approaches. If the color suddenly
changes to weaker colors as the fish enters MEDIUM and NEAR areas, the
TVG is improperly set. Adjust the TVG. If this again produces sea surface
reflections and noise try to remove them with AGC and NL controls.
3-8
Note: If the above procedure does not produce satisfactory results, the
TVG curve can be changed on the V-SCAN SETTING menu.
3.8 Suppressing Bottom Tail
3.8.1 AGC
The AGC functions to automatically reduce the receiver gain only against strong
echoes such as the bottom or a large fish school. Since weak echoes remain
unaffected, a small fish school becomes easier to detect . Adjust it so that the
AGC works only on bottom reflections. Do not set it too high; weak echoes may
be missed.
1. Press the [MENU] key to open the menu.
2. Select V-SCAN SETTING menu and press the [MENU] key.
3. Select AGC and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-9 and the default setting is 0. The higher the setting
the greater the degree of suppression.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
3. VERTICAL MODE
3.8.2 By decreasing pulselength
The pulselength determines the lengt h of the transmission pulse emitted into the
water. While a longer pulse is advantageous for long range sounding, it has the
disadvantage of being poor in discriminat ion of targets, that is, ability to separate
several closely located targets. When searching bottom fish, therefore, it is
useful to shorten the pulselength in order to separate fish echoes from bottom
reflections. Decrease the pulselength set ting to shorten the pulselength. For
search of surface and midwater fish in which bottom reflect ions are not so strong,
use the longest pulselength “9”.
1. Press the [MENU] key to open t he menu.
2. Select the V-SCAN SETTING menu and press the [MENU] key.
3. Select TX PULSELENGTH and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-9 and the default setting is 9. The higher the setting
the longer the pulselength.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
3-9
3. VERTICAL MODE
3.9 Rejecting Interference and Noise
While observing the vertical mode displa y, you may encounter occasional or
intermittent noise and interference. These are mostly caused by on-board
electronic equipment, engine or pro peller noise, or electrical noise from other
sonars being operated nearby.
3.9.1 Identifying noise source
To eliminate noise effectively, you should first identify the noise source as
follows:
1. Stop transmission from the TEST menu and turn on the power of all on-board
equipment one by one while obser ving the picture.
2. Run the boat at various speeds to check if the noise is speed dependent.
If neither of the above two steps has effect on the picture, do one of the
following:
3.9.2 Interference rejector
This control is similar to the interference rejector on echo sound ers and radars. It
is effective for rejecting random noise and sea surface reflections in rough sea
conditions. Set it so that noise is just eliminated. Do not use an unnecessarily
high setting since it may also reject small wante d echoes.
1. Press the [MENU] key to open the menu.
2. Select the V-SCAN SETTING menu and press the [MENU] key.
3. Select INT REJECT and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-3 and the default setting is 0. The higher the setting
the greater the degree of interference rejection.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
3.9.3 Noise limiter
Weak, unwanted reflections, colored light-blue or green, appear when the water
is dirty, plankton layers exists, or due to ship’s noise. The noise limiter can
reduce the effects of these unwanted reflections. Raising the set ting causes
unwanted reflections to become colors of blue t o background color. Normally a
setting of 3 or 4 is sufficient.
1. Press the [MENU] key to open the menu.
2. Select the V-SCAN SETTING menu and press the [MENU] key.
3. Select NOISE LIMITER and press the [MENU] key.
3-10
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-10 and the default setting is 2. The higher the setting
the greater the degree of suppression.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
3.10 Adjusting Beamwidth
The vertical beamwidth of the Rx beam can be adj usted on the OTHERS menu
to reduce surface reflections.
1. Press the [MENU] key to open the menu.
2. Select V-SCAN SETTING and press the [MENU] key.
3. Select OTHERS and press the [MENU] key.
MENU QUIT
V-SCAN SETTING QUIT
OTHERS QUIT
COLOR : COLOR 1
COLOR SETTING...
COLOR RESPONSE : COLOR CURVE 3
COLOR RESPONSE...
GAIN OFFSET : 0
SIGNAL LEVEL : 0
FAR TVG CURVE : TVG 2
TVG DISTANCE...
SMOOTH ECHO RNG : 0
SMOOTH ECHO CIR : 0
BEAMWIDTH : 0
DISPLAY POSITION : LEFT
VERTICAL SIZE : FULL
3. VERTICAL MODE
Figure 3-11 OTHERS menu
4. Select BEAMWIDTH and press the [MENU] key.
QUIT
CANCEL
Figure 3-12 Dialog box
5. Use the trackball to select S (raise setting) or T (lower setting) as
appropriate and press the [MENU] key. The setting range is 0 to 5 and the
default setting is 0. The higher the setting the sharper the beamwidth.
6. Select QUIT and press the [MENU] key.
7. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
3-11
3. VERTICAL MODE
3.11 Vertical Expansion Disp lay
The vertical expansion display enlarges the selected vertical display. Set t he
trackball mark on the desired location in the vertical 1 or vertica l 2 display as
desired and then press the [V1] or [V2] key, whichever is appropriate.
1547m
1300m
850m
B 12
250
500
R 2000m
G8
V 12
N
V
500 1500
1000
N-UP
R 2000m
AUTO
G10
P 8
17T
(21 )
E
Figure 3-13 Vertical 1 expansion display
NAV
DATA
DISPLAY
To quit the expansion display, press the [V1] or [V2] key.
3-12
3.12 V-SC AN SETTING Menu Overview
This section presents an overview of the V-SCAN SETTING menu.
3.12.1 Displaying the V-SCAN SETTING menu
1. Press the [MENU] key to open the menu.
2. Select V-SCAN SETTING and press the [MENU] key.
MENU QUIT
V-SCAN SETTING
QUIT
3. VERTICAL MODE
TX PULSELENGTH
TVG-NEAR
TVG-MEDIUM
TVG-FAR
NOISE LIMITER
AGC
ECHO AVERAGE
INT REJECT
OTHERS...
: 9
: 0
: 0
: 0
: 2
: 0
: 0
: 0
Figure 3-14 V-SCAN SETTING menu
3. Select OTHERS and press the [MENU] key.
MENU QUIT
V-SCAN SETTING QUIT
OTHERS QUIT
COLOR : COLOR 1
COLOR SETTING...
COLOR RESPONSE : COLOR CURVE 3
COLOR RESPONSE...
GAIN OFFSET : 0
SIGNAL LEVEL : 0
FAR TVG CURVE : TVG 2
TVG DISTANCE...
SMOOTH ECHO RNG : 0
SMOOTH ECHO CIR : 0
BEAMWIDTH : 0
DISPLAY POSITION : LEFT
VERTICAL SIZE : FULL
Figure 3-15 OTHERS menu
3-13
3. VERTICAL MODE
3.12.2 V-SCAN SETTING menu description
TX PULSELENGTH: Chooses Tx pulselength. For further details see “3.8.2 By
decreasing pulselength” on page 3-9.
TVG-NEAR,-MEDIUM,-FAR: Adjust TVG level. For further details see “3.7
Eliminating Weak Echoes” on page 3-7.
NOISE LIMITER: Suppresses weak unwanted reflections. For further details see
“3.9.3 Noise limiter” on page 3-10.
AGC: Suppresses bot tom echo tail. For further details see “3.8.1 AGC” on page
3-9.
ECHO AVERAGE: Adjusts echo afterglow, which can be useful for watching
echo movement. The setting range is 0-3 and the default setting is 0. The higher
the number the longer echoes remain on t he screen.
INT REJECT: Rej ects interference from other sonars and radars. For further
details see “3.9.2 Interference rejector” on page 3-10.
OTHERS: See below.
OTHERS sub menu
COLOR: Select color arrangement to use. The default set ting is COLOR 1 and
the setting range 1-4.
COLOR SETTING: Customizes colors on the vertical display. Operation is same
as that for the horizontal display. For further details see “COLOR SETTING…”
on page 2-36.
COLOR RESPONSE: Color response defines reflected echo strength versus
color level conversion. You can select one of four color response tables, and the
default setting is COLOR RESPONSE 3 and the setting range is 1-4.
COLOR RESPONSE…: Adjusts reflected echo strength versus echo color level
for currently selected color response number. Operation is the same as that for
the horizontal display. For further details see “COLOR RESPONSE…” on page
2-37.
GAIN OFFSET: Adjusts gain level. If the front panel [GAIN] control does not
provide satisfactory gain adjustment, enter an offset here. The default setting is
0 and the setting range is 0-12.
3-14
SIGNAL LEVEL: Dirty water or reflections from plankton may be painted on the
screen in green or light-blue. These echoes may be erased in order of strength.
Select the signal level to erase with the trackball and press the [ MENU] key. The
setting range is 0-15 and the default setting is 0.
3. VERTICAL MODE
FAR TVG CURVE: Selects the TVG curve to use. The smaller the number the
gentler the gain change over distance. TVG2 is the default TVG curve.
TVG DISTANCE…: Sets the TVG effective distance for near, medium and far
ranges.
Setting range
NEAR: 50-150 m, 10 m increments, default setting 100 m
MED: 300-500 m, 20 m increments, default sett ing 400 m
FAR: 600-1000 m, 40 m increments, default setting 800 m
To adjust a TVG curve, select S or T of item desired and press the [MENU] key
to change the setting.
Select to register
setting and finish.
QUIT
Quit
NEAR
100m
MED
400m
Select item with trackball
and press [MENU] key to
change setting.
FAR
800m
CANCEL
Cancel
Select to cancel
change.
Figure 3-16 TVG setting window
SMOOTH ECHO RNG: Selects echo smoothing level in the range direction. The
setting range is 0-3 and the def ault setting is 0. The higher the setting the
greater the smoothing.
SMOOTH ECHO CIR: Selects echo smoothing level in circular direction. The
setting range is 0-3 and the def ault setting is 0. The higher the setting the
greater the smoothing.
BEAMWIDTH: Adjusts vertical beamwidth. The higher the setting, the narrower
the beamwidth. The setting range is 0-5 and the def ault setting is 0.
DISPLAY POSITION: Selects where to display the vertical display, left side or
right side. Left side is the default setting.
3-15
3. VERTICAL MODE
VERTICAL SIZE: Selects display size from full (default setting) and half. Choose
“half” to expand the effective viewing area on the horizontal displa y, The ratio for
the full-size display is H4:V3 and H4:V2 f or the half-size display.
4
3
Full Size Half Size
2
1
Figure 3-17 Display size
3-16
3. VERTICAL MODE
3.13 Application to Bonito and Tuna Fishing
Tracking of bonito and tuna presents a special challenge to the sonar operator:
He must try to keep them within the sonar beam, a formidable task considering
their high speed and penchant f or leaping and diving. The FSV-24, however, with
its vertical beam, makes this task easier.
3.13.1 Searching
Neither the naked eye nor binoculars can continually track fish schools which
make lightning quick runs between the surf ace and midwater. A sonar, however,
provides a continuous view of several hundred meters of sea area around the
boat, both at the surface and below it.
3.13.2 Tracking
If you are visually tracking a fish school which characteristically leaps and dives
regularly, or a school with a flock of birds hovering over it, the school will scatter
once the vessel approaches, thus you will lose sight of the school. This sonar
provides continuous pictures of underwater con dit ions, so you can always know
where a fish school is. For tracking the schools which leap and dive often t he
vertical mode is especially effective.
Figure 3-18 Tracking
3-17
3. VERTICAL MODE
3.13.3 Approaching
The sonar lets you view fish school movement continuously, thus you can
approach a school confident of a good catch.
While a flock of birds hovering over the sea surface is usually a good indicat ion
of the presence of a fish school, the sonar can better verify fish school size.
3.13.4 Catching
While the sonar operator monitors the sonar for other f ish schools, the crew can
scatter bait and water to attract fish to t he boat.
Figure 3-19 Approaching
Figure 3-20 Catching
3-18
4. ECHO SOUNDER MODE
The echo sounder picture is available with connection of an echo sounder.
4.1 Basic Operating Procedure
4.
Select appropriate echo sounder mode.
3.
2.
Lower transducer.
1.
Turn on power.
Adjust display brilliance.
Figure 4-1 Control unit
5.
Adjust range, gain and
picture advance speed on
the ES1 SETTING (or
ES2 SETTING) menu.
4-1
4. ECHO SOUN DER MODE
4.2 Typical Echo Sounder Displays
4.2.1 Echo sounder 1 display
This display shows the picture from an echo sounder on the right-hand side of
the display.
Trackball mark position reference mark (See below.)
N
Color bar
Transmission line
W
S
* Shows horizontal display width
(in meters). Appears when picture advance
speed is synchronized with ship
speed.
Figure 4-2 Indications and markers on the echo sounder 1 display
Trackball mark position reference mark
NAV DATA DISPLAY
1800m
2
Fish estimate mark no. and beginning and
ending depths (dashed lines) of estimate
mark calculation
800
E
Bottom
Fish echo
Speed sync
advance width data*
0
Distance from own
ship to trackball mark
26
Depth of trackball mark
30
Trackball mark
Range scale
60
The trackball mark position reference mark, a solid circle, is inscribed on the
ship’s track when the trackball mark is placed in the echo sounder display. Its
purpose is to show corresponding trackball mark position on the horizontal
display. I t changes position with trackball mark position an d tilt range, and
disappears when its position is no longer within the range of the echo sounder
display. This mark does not appear when the distance to the trackball mark is
longer than the track length. Own ship’s speed data is required for this function.
Trackball mark
position reference
mark
Track
a
Trackball mark
Figure 4-3 Trackball mark position reference mark
4-2
4. ECHO SOUN DER MODE
4.2.2 Echo sounder 2 (net recorder or echo sounder) display
With net recorder connection, the echo sounder 2 display can show the picture
from the net recorder. (The picture from an echo sounder may also be shown.)
You may show the net recorder’s downward looking picture.
Downward soundi ng net recorder display
N
NAV DATA DISPLAY
1800m
S
800
E
0
25
30
60
Ground rope
Figure 4-4 Indications and markers on the echo sounder 2 display
(shown: downward looking display)
4-3
4. ECHO SOUN DER MODE
4.2.3 Echo sounder combination mode (ES1 + ES2)
This display shows the picture from the echo sounder and the net recorder. Also
two echo sounder pictures can be displayed, or upward and down ward looking
display of the net recorder can be displayed.
Echo sounder + Net Recorder display
N
W
NAV DATA DISPLAY
E
0
60
Echo Sounder
Display (ES1)
120
0
Net Recorder
30
Display (ES2)
S
60
Figure 4-5 Echo sounder combination mode
4-4
4. ECHO SOUN DER MODE
Upward + downward looking net recorder display (ES2 mode)
The marks and indications which appear on the downward looking display are
also common to the upward + downward sounding displa y.
N
NAV DATA DISPLAY
60
150
0
Upward
25
Sounding
Picture
0
0
30
E
W
E
30
S
Ground rope
Downward
Sounding
Picture
60
Figure 4-6 Echo sounder 2 display (Upward + downward looking display)
4-5
4. ECHO SOUN DER MODE
4.3 Selecting an Echo Sounder Mode
An echo sounder mode may be selected with the [MODE] key, however no echo
sounder mode is available in the default setting. To enable selection of an echo
sounder mode with the [MODE] key follow the procedure below.
4.3.1 Enabling an echo sounder mode
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select DISPLAY SETTING and press the [MENU] key.
MENU QUIT
OTHERS
DISPLAY SETTING
DISPLAY MODE...
MODE SELECTION : MODE KEY
PRESENTATION MODE :HEAD UP
TM DISPLAY RANGE : 1.3R
BEARING REF : SHIP HEADING
H-SLICE WIDTH : 16
H-SLICE PICT ADVC : KP SYNC
NET COURSE MARK : ENTER
MANUAL DEGAUSS : EXECUTE
AUTO DEGAUSS : INT SENSOR
DIMMER : 10
KEY BEEP VOLUME : 5
QUIT
QUIT
Figure 4-7 DISPLAY SETTING menu
4. Select DISPLAY MODE and press the [MENU] key to show the display mode
dialog box.
QUIT
CANCEL
HORIZONTAL
V1
V1&V2
V1&ES1
V1&ES2
HISTORY
ES1
ES2
ES1&ES2
Figure 4-8 Display mode dialog box
4-6
4. ECHO SOUN DER MODE
5. Select desired ES modes (you may select as many modes as you wish)
referring to the illustration below and press the [MENU] key. The check marks
in the dialog box denote active modes.
ES1: Echo sounder picture
ES2: Net recorder picture (or echo sounder picture)
Depending on the menu setting, the screen combination can be shown as
follows.
System menu setting and available displays
ES2 on the
SYSTEM menu*
NET RECOR DER
DISP** on ES2
Sample
SETTING menu
ES None 1)
NR down 2) NR
NR up, NR down 3)
* = For details about SYSTEM menu, contact your dealer or refer t o
Installation manual.
** = When NET RECORDING DISP is set for UP/DOWN, the ES1 picture
changes from the echosounder picture to the upward sounding net
recorder picture.
ES1 + V1
1) ES1
2) ES1
3) NR up
1) ES2
2) NR down
3) NR down
ES1
1) ES1
2) ES1
3) NR up
1) ES2
2) NR down
3) NR down
1) ES1
2) ES1
3) NR up
1) ES2
2) NR down
3) NR down
ES1
ES2
ES2
ES2 + V2
ES: Echo sounder picture
NR up: Net Recorder upward picture
NR down: Net Recorder downward picture
Figure 4-9 Echo sounder mode configuratio ns and menu setting
6. Select QUIT and press the [MENU] key.
7. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
4-7
4. ECHO SOUN DER MODE
4.4 Selecting Display Range
The basic range and range shifting functions together give you the means to
select the depth you can see on the screen. The basic range can be thought of
as providing a “window” into the water column and range shifting as moving the
“window” to the desired depth.
Note: Select the Range and Shift as same as the echo sounder connected. This
setting does not affect the original echo sounder set ting.
Shift
Display
Figure 4-10 Range and display shift concept
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select ES1 SET TI NG (or ES2 SETTING) and press the [MENU] key.
MENU QUIT
OTHERS QUIT
ES1 SETTING
GAIN : 5
RANGE : 160 m
SHIFT : 0 m
CLUTTER : 0
SIGNAL LEVEL : 0
INT REJECT : OFF
PICTURE ADVANCE : 1/1
PICT ADVC AT SHOOT
COLOR SETTING...
COLOR RESPONSE...
SCALE POSITION : RIGHT
QUIT
: SPEED SYNC
GAIN : 5
RANGE BELOW NET : 160 m
RANGE UPPER NET : 160 m
CLUTTER : 0
SIGNAL LEVEL : 0
INT REJECT : OFF
PICTURE ADVANCE : 1/1
COLOR SETTING...
COLOR RESPONSE...
NET RECORDER DISP : UP/DOWN
NET RECORDER RANGE : 80 m
MENU QUIT
OTHERS QUIT
ES2 SETTING
QUIT
4-8
ES1 SETTING menu ES2 SETTING menu
(net recorder connected)
Figure 4-11 ES1 SETT ING, ES2 SETTING menus
4. ECHO SOUN DER MODE
4. Select RANGE (or RANGE UPPER NET, RANGE BELOW NET in case of
net recorder on the ES2) and press the [MENU] key.
QUIT
CANCEL
20m
40m
60m
80m
120m
160m
240m
320m
RANGE menu
(ES1 SETTING menu)
QUIT
CANCEL
20m
40m
60m
80m
120m
160m
240m
320m
INTERLOCK
RANGE menu
(ES2 SETTING menu)
Figure 4-12 Range dialog box
5. Use the trackball to select range desired and press the [MENU] key.
(INTERLOCK in the range dialog box for t he ES2 SETTING menu uses the
same range as set for ES1. It is effective when the ES2 display is in use.)
6. Select QUIT and press the [MENU] key.
7. Select SHIFT in case of echo sounder ES1 and press the [MENU] key.
QUIT
CANCEL
Figure 4-13 Dialog box for setting numeric data
8. Use the trackball to select S or T and press the [MENU] key to select shift
desired.
9. Select QUIT and press the [MENU] key.
10. Select QUIT at the top of the menu screen and press the [MENU] key to
close the menu.
4-9
4. ECHO SOUN DER MODE
4.5 Adjusting the Gain
You may adjust the display l evel of the echo sounder picture as below; the gain
of the echo sounder itself cannot be adjusted from the sonar.
Note: Adjust the Gain as same as the echo sounder connected. This setting
does not affect the original echo sounder setting.
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select ES1 SETTING (or ES2 SETTING) and press the [MENU] key.
MENU QUIT
OTHERS QUIT
ES1 SETTING
GAIN : 5
RANGE : 160 m
SHIFT : 0 m
CLUTTER : 0
SIGNAL LEVEL : 0
INT REJECT : OFF
PICTURE ADVANCE : 1/1
PICT ADVC AT SHOOT
COLOR SETTING...
COLOR RESPONSE...
SCALE POSITION : RIGHT
ES1 SETTING menu ES2 SETTING menu
(net recorder connected)
QUIT
: SPEED SYNC
Figure 4-14 ES1 SETTING and ES2 SETTING menus
4. Select GAIN and press the [MENU] key.
MENU QUIT
OTHERS QUIT
ES2 SETTING
GAIN : 5
RANGE BELOW NET : 160 m
RANGE UPPER NET : 160 m
CLUTTER : 0
SIGNAL LEVEL : 0
INT REJECT : OFF
PICTURE ADVANCE : 1/1
COLOR SETTING...
COLOR RESPONSE...
NET RECORDER DISP : UP/DOWN
NET RECORDER RANGE : 80 m
QUIT
4-10
QUIT
CANCEL
Figure 4-15 Dialog box for setting numeric data
5. Use the trackball to select S or T and press the [MENU] key to select gain
desired.
6. Select QUIT and press the [MENU] key.
7. Select QUIT at the top of the menu screen and press the [MENU] key to
close the menu.
4.6 Picture Advance Speed
The picture advance speed determines how quickly the vertical scan lines run
across the screen. When selecting a picture advance speed, keep in mind that a
fast advance speed will expand a fish school horizontally and a slow advance
speed will contract it.
Note: Adjust the Picture Advance Speed as same as the echo sound er
connected. This setting does not affect the original echo sounder setting.
1. Press the [MENU] key to open the menu.
2. Select OTHERS and press the [MENU] key.
3. Select ES1 SETTING (or ES2 SETTING) and press the [MENU] key.
4. Select PICTURE ADVANCE and press the [MENU] key.
QUIT
CANCEL
4. ECHO SOUN DER MODE
1/1
1/2
1/4
1/8
SPEED SYNC
Figure 4-16 Picture advance speed dialog box
4. Use the trackball to select advance speed desired and press the [ MEN U] key.
The fractions in the dialog box are one line produced per number of
transmissions. For example, 1/2, displays one scan line per two
transmissions. SPEED SYNC advances the picture according to ship’s speed.
This mode is advantageous for judging fish school size and abundance since
fish schools will be shown at their actual sizes regardless of ship’s speed.
Note: When using “SPEED SYNC,” and the echo sounder signal beco mes
lost, the picture shown at the time the signal was lost is copied and
continuously replayed on the screen until the echo sounder signal is
restored.
6. Select QUIT and press the [MENU] key.
7. Select QUIT at the top of the menu screen and press the [MENU] key to
close the menu.
4-11
4. ECHO SOUN DER MODE
4.7 Measuring Depth, Distance
You can measure depth and distance (pict ure advance set for “speed sync”)
from own ship to a location with the trackball m ark. Use the trackball to place the
trackball mark on the location. The trackball mark shows distance on its
horizontal axis and distance on its vertical axis.
N
NAV DATA DISPLAY
1800m
800
0
Distance from own
ship to mark
25
W
E
40
Depth
Trackball
mark
Range
scale
80
S
Figure 4-17 How to measure depth and distance on t he echo sounder display
4-12
Loading...