Furuno CSH-23/24, CSH-23, CSH-24 Operator's Manual

COLOR SCANNING SONAR

MODEL

CSH-23/24

Your Local Agent/DealerYour Local Agent/Dealer

9-52 Ashihara-cho,9-52 Ashihara-cho,
Nishinomiya, JapanNishinomiya, Japan

Telephone :Telephone : [phone]-65-2111
Telefax :Telefax : 0798-65-42000798-65-4200

FIRST EDITION :FIRST EDITION : NOV.NOV. 19971997

Printed in JapanPrinted in Japan

A

ll rights reserved.

A

ll rights reserved.

E :E : APR.APR. 05,200205,2002

PUB.No.PUB.No. OME-13040OME-13040

*00080805900**00080805900*

*00080805900**00080805900*

(( DAMIDAMI ))

CSH-23/24CSH-23/24

* 0 0 0 8 0 8 0 5 9 0 0 ** 0 0 0 8 0 8 0 5 9 0 0 *

*OME13040E00**OME13040E00*

*OME13040E00**OME13040E00*

* O M E 1 3 0 4 0 E 0 0 ** O M E 1 3 0 4 0 E 0 0 *

iiiiiiiiiiiii

i

SAFETY INSTRUCTIONS

WARNING

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.

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.

Do not open the equipment.

Hazardous voltage which can
cause electrical shock exists
inside the equipment. Only
qualified personnel should
work inside the equipment.

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.

ii

CAUTION

Do not exceed 18 knots when operating
the equipment and do not exceed 16
knots when lowering or raising the
transducer.

The transducer may become damaged.

The zinc block attached near the
transducer must be replaced yearly.

The junction between the transducer and
main shaft may corrode, which can result
in loss of the transducer or water leakage
inside the ship.

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.

Replace the monitor when the picture
becomes difficult to see.

The average life of the monitor is about
10 years. Replace it when the picture be­comes difficult to see, to protect vision.

A warning label is attached to the equip­ment. Do not remove the label. If the
label becomes soiled or illegible, contact
a FURUNO agent or dealer.

iii

T ABLE OF CONTENTS

FOREWORD

A Word to CSH-23/24 Owners ...............................................................................................vii

Features...................................................................................................................................vii

System Configuration ............................................................................................................viii

CONTROL DESCRIPTION

Control Layout on Display Unit and Remote Control Box ...................................................1-1

Main Panel.............................................................................................................................1-2

Sub Panel 1 ............................................................................................................................1-4

Sub Panel 2 (data setting window) ........................................................................................1-5

Remote Control Box..............................................................................................................1-8

OPERA TIONAL OVER VIEW

Turning the Power On/Off .....................................................................................................2-1

Adjusting Screen Brilliance, Control Panel Backlighting .....................................................2-1

Lowering the Transducer .......................................................................................................2-1

Selecting a Display Mode......................................................................................................2-2

Selecting a Display Range.....................................................................................................2-3

Setting the Tilt Angle.............................................................................................................2-3

Adjusting the Gain.................................................................................................................2-7

Measuring Range and Bearing to a Target.............................................................................2-7

FINE TUNING THE PICTURE

Eliminating Unwanted Feeble Echoes...................................................................................3-1

Suppressing Seabed Tail ........................................................................................................3-3

Suppressing Seabed and Sea Surface Reflections in Shallow Waters ...................................3-4

Rejecting Sonar Interference and Noise ................................................................................3-4

Adjusting Beamwidth ............................................................................................................3-6

MARKS AND DAT A

Marks, Data and Display Mode.............................................................................................4-1

Permanently Displayed Marks and Data ...............................................................................4-3

Erasable Marks and Data .......................................................................................................4-4

MENU OVERVIEW

USER Menu Operation..........................................................................................................5-1

USER Menu Description .......................................................................................................5-3

SYSTEM Menu Description .................................................................................................5-5

DATA SET Menu Description ...............................................................................................5-8

INIT SET/TEST Menu Description.....................................................................................5-11

iv

FUNCTION KEYS

Programming the Function Keys ...........................................................................................6-1

Replaying a Function Key .....................................................................................................6-1

Function Key Fine Tuning.....................................................................................................6-2

Saving Function Key Settings to a Memory Card .................................................................6-3

Replaying Function Key Settings from a Memory Card .......................................................6-3

ADVANCED LEVEL OPERATION

Finding Fish School Center ...................................................................................................7-1

Tracking a Fish School (target lock)......................................................................................7-2

Detecting Fish Schools Aurally .............................................................................................7-7

The Fish Alarm ......................................................................................................................7-8

Relocating Fish School for Easy Observation .......................................................................7-9

Comparing of Fish School Concentration ...........................................................................7-10

Measuring Fish School Speed .............................................................................................7-11

The Event Mark ...................................................................................................................7-12

True Motion Display............................................................................................................7-14

Plotting Net Location Mark .................................................................................................7-15

Observing Net Behavior ......................................................................................................7-16

Target Slice Display.............................................................................................................7-17

PORT/STARBOARD, HORIZONTAL SLICE DISPLAYS

Port/Starboard Display ..........................................................................................................8-1

Horizontal Slice Display........................................................................................................8-2

MEMORY CARD OPERATIONS

Initializing Memory Cards.....................................................................................................9-1

Saving the Picture..................................................................................................................9-2

Transferring Echo Data from Internal Memory to Memory Card .........................................9-2

Saving Net Shooting Data .....................................................................................................9-3

Replaying Saved Data ...........................................................................................................9-4

Deleting Memory Card Contents...........................................................................................9-4

TURNING MARKS, DATA ON/OFF ..................................................................10-1

INTERPRETING THE DISPLAY

Seabed Echoes .....................................................................................................................11-1

Fish Schools......................................................................................................................... 11-2

Sea Surface Reflections .......................................................................................................11-3

Wake ....................................................................................................................................11-3

False Echo by Sidelobe........................................................................................................11-4

Noise and Interference.........................................................................................................11-4

v

WARNINGS

Overvoltage Warning ...........................................................................................................12-1

Unretracted Transducer W arning.........................................................................................12-1

SELF TESTS

Opening the Self Test Menu ................................................................................................13-1

Self Test Description............................................................................................................13-2

Interface Unit CS-120A Self T est........................................................................................13-5

INPUT DA TA SELECTION

Selection of Data at Interface Unit CS-120A ......................................................................14-1

Setting Distances Between Net Sonde T ransmitters............................................................14-2

MAINTENANCE

Display Unit Maintenance ...................................................................................................15-1

Hull Unit Maintenance ........................................................................................................15-2

MENU TREE..................................................................................................................A-1

SPECIFICA TIONS..................................................................................................... SP-1

INDEX.............................................................................................................................. IN-1

This page is intentionally left blank .

vii

FOREWORD

A Word to CSH-23/24 Owners

Congratulations on your choice of the FURUNO CSH-23/24 Color Scanning Sonar . We are
confident you will see why the FURUNO name has become synonymous with quality and
reliability .

For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for qual­ity marine electronics equipment. This dedication to excellence is furthered by our exten­sive global network of agents and dealers.

This equipment is designed and constructed to meet the rigorous demands of the marine
environment. However, no machine can perform its intended 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 FURUNO CSH-23/24 Color Scanning Sonar is a full-circle, multibeam electronic scan­ning sonar which detects and instantaneously displays fish schools and underwater condi­tions in 16 colors on a 15/21" non-glare, high resolution CR T screen.

The main features of the CSH-23/24 are

• Vivid 16-color display provides intuitive recognition of seabed and concentration, distri­bution and volume of fish schools.

• Markers and indications keep the operator abreast of fishing conditions.

• Remote control box provides for armchair control of major functions.

• New gain, range or tilt setting appears in large characters whenever corresponding con­trol is adjusted.

• Function keys automatically setup the equipment to perform specific task.

• High power MOS FET transmitter ensures reliable operation under any condition.

viii

System Configuration

1-1

CONTROL DESCRIPTION

Control Layout on Display Unit and Remote
Control Box

SUB PANEL 2

POWER TRANSDUCER

OFF ON

F1 F2 F3

-

+

NORM E/S HIST RECALL MEMO

TARGET
SLICE

SHOOT R/B

-

+

-

+

RANGE GAIN

AUTO

TILT

WIDTH

TILT

SCAN DEPTH

DIM CONT BRILL AUDIO

NET

COURSE

TARGET

LOCK

EVENT1 EVENT2

ESTI-

MATE1

ESTI-

MATE2

FISH

OFF­CENT

MAIN PANEL

SUB PANEL 1

PUSH-OPEN

VERT
SCAN

1

2

3

DISP SELECT

DATA

dc

d

EVENT

TGT LOCK

ESTIMATE

1

NET COURSE

FISH

OFF­CENT

TX

1

234

FUNCTION

5

–

+

RANGE

+

–

GAIN

SHOOT

MEMO

TGT

SLICE

RECALL

AUTO

AUTO

VERT
SCAN

TILT

TRAIN

SCAN DEPTH

REMOTE CONTROL BOX

Figure 1-1 Display unit and
remote control box

1-2

Main Panel

POWER TRANSDUCER

OFF ON

F1 F2 F3

-

+

NORM E/S HIST RECALL MEMO

TARGET
SLICE

SHOOT R/B

-

+

-

+

RANGE GAIN

AUTO

TILT

WIDTH

TILT

SCAN DEPTH

DIM CONT BRILL AUDIO

NET

COURSE

TARGET

LOCK

EVENT1 EVENT2

ESTI-

MATE1

ESTI-

MATE2

FISH

OFF-

CENT

VERT
SCAN

Figure 1-2 Main panel
Main panel control description

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1-3

Control Function

NORM, E/S, HIST
(Mode keys)

Select display mode: NORM, normal sonar picture; E/S, Echo sounder
combination; HIST, Historical display.
Lamp above a key lights to show current selection.

RECALL, MEMO RECALL: Replays saved picture.

MEMO: Saves picture to memory card or internal memory.
RANGE Selects a picture display range. Range selected appears on the display.
GAIN Adjusts receiver sensitivity.
TARGET SLICE Using automatic tilting, displays the echo inside the estimate mark at

several different tilt angles.
VERT SCAN Not used.
SHOOT Press when net is cast. The net shooting mark, *net sonde marks and

*current mark appear at the own ship mark. The net shooting mark,

net sonde marks and current mark move on the *ship's track as the

ship moves. The lamp above the switch lights and time *distance run

appears on the display until the net shooting mark is turned off.

(* Requires external sensor.)
R/B Provides range and bearing data from own ship to a target. Select

target with trackball and then press the R/B key. A line connects

between own ship mark and trackball mark to show bearing to target.
TILT Changes the tilt angle of the sounding beam between -5°and 60°.
AUTO TILT Automatically tilts the sounding beam up and down in 2° steps within

the tilt angle selected by the WIDTH key. The lamp above the key

lights when automatic tilt is on.
WIDTH Sets tilt width in automatic tilt.
NET COURSE Marks location of net.
TARGET LOCK Tracks a fish school.
EVENT Inscribe event mark on the display, to find horizontal, range, depth

and bearing to a target. Event key can be functioned as SHOOT

key of remote control box.
ESTIMATE 1, 2 Compare volume of two fish schools.
FISH Measures fish school speed.
OFF-CENT Relocates selected target.
DIM Adjusts the backlighting of the control panels and the brightness of

the lamps above keys.
CONT Adjusts screen contrast.
BRILL Adjusts screen brilliance.
AUDIO Adjusts volume of built-in loudspeaker, which monitors a target

appearing along the bearing marker.
TRACKBALL Follows on-screen movement of the trackball mark, to enter marks

and off-center the screen.

1-4

Sub Panel 1

RECALL

MEMOHISTE/SNORM

F4

F5F3F2F1

ON

OFF

POWER

TRANSDUCER

CARD

REPLAY

COLOR

NET

REPLAY

TX

HELP

END

MENU

Figure 1-3 Sub panel 1
Sub panel 1 control description

Control Function

MENU Opens/closes the menu.
END • When the menu is displayed it terminates menu operation and

returns control to the sonar picture.

• When in a sub menu it returns control to previous sub menu.

HELP Provides operating information for current menu.

Select items on menus.

CARD REPLAY Replays card-stored control and menu settings.
COLOR Changes display color among four choices.
NET REPLAY Replays internally stored net shooting data. To replay, press key to

light lamp above it, select item to replay, and press the key again.

TX Press to transmit, when transducer is lowered. The lamp lights during

transmission.

1-5

Sub Panel 2 (data setting window)

SIGNAL

DELETE MK

TVG•TX

ES

SONR•BEAM

AUTO

ALM•AUDIO

NEAR7MEDIUM

8

FAR

9

CYCLE

7

PL

8

OUTPUT

9

TVG TX

+ + + + + +
– – – – – –

h

g

OPER
P-SET

(TOGGLE)

Setting change keys
Change control setting.

Item selection keys

Select item.

OPER P-SET key
Opens/closes data setting window.

ITEM

(TVG•TX selected)

CURRENT SETTINGS for item selected (TVG•TX)

This example shows settings
of TVG and TX.

Figure 1-4 Sub panel 2
Sub panel 2 control description

Main

Item

Item

Setting

Range

Description

Normal

Setting

Main Sub

TVG•TX

TVG

NEAR 0–9

Adjusts receiver gain within
100 m.

5

MEDIUM 0–9

Adjusts receiver gain between
100 m and 400 m.

5

FAR 0–9

Adjusts receiver gain beyond
400 m.

5

TRANS­MIT

CYCLE 0–9

Sets Tx cycle. 9 is normal
setting (fastest). "0" synchro­nizes with external KP.

9

PL 0–9

Sets Tx pulselength. 9 is normal
setting.

9

OUTPUT 0–9

Sets Tx output power. 9 is
maximum power.

9

(Continued on next page)

1-6

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automatically set to “0”.

1-8

Remote Control Box

1

2

3

DISP SELECT

DATA

EVENT

TGT LOCK

ESTIMATE

1

NET COURSE

FISH

OFF­CENT

TX

1

234

FUNCTION

5

–

+

RANGE

+

–

GAIN

SHOOT

MEMO

TGT
SLICE

RECALL

AUTO

AUTO

VERT
SCAN

TILT

TRAIN

SCAN DEPTH

Each press displays water
temperature or depth at screen
center for about five seconds.

Turns on transmitter.

Shifts trackball mark.

1-3: Same as 1-3 on main panel.
4-5: Same as - and + on main panel.

Displays the net shooting mark.

Saves picture to memory card.

Present a four (or five) angle view of
echo inside estimate mark. Light switch
to start.

Varies the tilt angle of the
sounding beam between -5°
and 60°.

Automatically tillts sounding
beam in 2° steps within tilt
angle selected by the WIDTH key.

Not used.

Not used.

Adjusts receiver sensitivity.

Selects display range.

Press to enter mark
shown on key or shift
screen center.

ises/lowers the transducer.
: Raises transducer.
: Mid protrusion
: Full protrusion

elects which display unit to

ontrol in multiple display unit

stallation.

Replays a stored picture.

➡

➡

➡

Figure 1-5 Remote control box

2-1

OPERA TIONAL OVERVIEW

T urning the Power On/Off

Turning the power on

Press the ON switch on the main panel. The lamp above the
switch should light. If it doesn’t, press the TX switch on sub
panel 1.

Turning the power off

Retract the transducer with the c switch and then press the OFF
switch on the main panel.

Note: The transducer is automatically retracted into the tank even
if the OFF switch is pressed before retracting the transducer.
However, make it a habit to retract the transducer before turning
off the power.

Adjusting Screen Brilliance, Control Panel Backlighting

The BRILL control adjusts screen brilliance, and the DIM con­trol adjusts control panel backlighting. These controls are on the
lower part of the main panel.

Lowering the T ransducer

Press d or d switch. The lamp above the
switch blinks during lowering of the trans­ducer and lights when the transducer is com­pletely lowered. In normal use fully lower
the transducer. The transducer extends
*1200 mm below the ship’ s hull, providing
stable and cavitation-free soundings. If the
transducer may become entangled in the net,
after shooting the net, for example, partially
raise the transducer with the

d switch. This

raises the transducer by 400 mm (transducer
extends *800 mm from ship’s hull).

*Hull unit with 1600mm (full) and 1200mm
(mid) protrusions are also available.

CAUTION

Do not exceed speed noted in the speci­fications when operating the equipment
or lowering or raising the transducer.

The transducer may become damaged.

Do not press the c switch during
lowering of the transducer, and do not
press the

d or d switch during raising

of the transducer.

The equipment may become damaged.

2-2

Selecting a Display Mode

The CSH-23/24 provides three display modes: normal sonar pic­ture, echo sounder (E/S) combination, and history display com­bination. Those modes may be selected with the NORM, E/S
and HIST keys.

Table 2-1 Display mode description

Mode Description

The sonar picture appears over the entire screen.
This mode is useful for detecting and tracking fish
schools.
The default display area is 1.3 times
the range, but it can be changed to

1.6 times the range on "EXT KP/TM
DSP" in the SYSTEM menu.
Navigation information can be
displayed in the text window at
the screen bottom by turning on
"DATA DISPLAY" in the USER
menu.

Normal scanning picture appears on the upper 5/8
of the screen and the signal fed from the echo
sounder on the lower 3/8. This mode is suitable for
judging fish school concentration.
When two echo sounders are connected, each
pressing of the E/S key alternately selects echo
sounder 1 or echo sounder 2.
Note that a net recorder can be connected as echo
sounder 2; select it on the "ES" sub menu in the
INIT SET/TEST menu.

Normal scanning sonar picture appears on the upper
5/8 of the screen and the history display on the
lower 3/8. Three types of history displays are
available: Audio, Port/Starboard and Horizontal
Slice. You can select which one to display on the
USER menu.

NORMAL

E/S

HISTORY

Text window

2-3

Selecting a Display Range

Operate the RANGE control to select a display range. The se­lected range appears at the top of the screen.

Setting the 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 zero degrees and when emitted most down­ward, 60 degrees.

To set a tilt angle, operate the TILT lever.
W atch the tilt angle indication at the top right
corner on the screen. The tilt angle can be set
in one-degree steps from -5 (upward) to 60°
(downward) degrees.

Finding a proper tilt angle is important when searching for fish.

Seabed echo and tilt angle

Case 1: Tilt angle 30 to 40 degrees
This tilt angle will display the entire seabed since it is captured

by the full width of the beam.
Case 2: Tilt angle 10 to 20 degrees
This tilt angle will only display half the seabed since it is only

captured by the lower half of the beam.
Case 3: Tilt angle 0 to 10 degrees
This tilt angle may or may not capture the seabed since the re-

turning echo is weak.

R400
T 15

Tilt
angle

2-4

How to discriminate fish echoes from the seabed

The figure below illustrates how two fish schools a and b are
displayed on the screen using three different tilt angles.

Case 1: Tilt angle 30 to 40 degrees. Fish school is obscured by
the seabed.

Case 2: Tilt angle 10 to 20 degrees. Fish school is located above
the seabed (midwater).

Case 3: Tilt angle 0 to 10 degrees. Fish school is located close to
the seabed.

Case 1

Case 2

Case 3

Fish school a

b

Case 3

Case 1 Case 2

Fish school aFish school a

Seabed

Seabed

}

Sea bed

Figure 2-1 Fish echo and tilt angle

Points to consider

• Normally , a vertically distributed fish school is a better sonar
target than the seabed, 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
seabed on the display.

• It is difficult to detect bottom fish when they are not distrib­uted vertically .

2-5

Tilt angle for surface fish

Sound emitted from the sonar transducer forms a circle-shaped
beam with a width of approximately 12 degrees in the vertical
direction (vertical beam width). The tilt angle is indicated by the
angle between the center line of the beam and the horizontal
plane. Then, if the tilt angle is set to 0 degrees, the center line is
parallel with the sea surface and one half of the emitted 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 just like
a light hitting a mirror at a narrow 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
degrees so the upper portion of the beam becomes almost paral­lel with the sea surface. When the sea is rough, it is often set to a
little larger angle.

Tilt angle 0°

Surface

Tilt angle 5-6°

Surface

12°

12°

Figure 2-2 Tilt angle and sea surface reflections

2-6

Suitable tilt angle

The figure below illustrates the relationship among tilt angle,
depth and detection range. Refer to it to find out the suitable tilt
angle for a given depth/detection range.

100

(200)

200

(400)

300

(600)

400

(800)

Range (m)

0¡

5¡

10¡

15¡

20(40)
40(80)

60(120)

80(160)

100(200)

200(400)

Vertical width of sonar beam

12°

21 m

100 m100 m

300 m

63 m

200 m

Depth (m)

42 m

Tilt angle and beam coverage

Figure 2-3 Tilt angle and beam coverage

2-7

Adjusting the Gain

The GAIN control adjusts receiver sensitivity (gain). Adjust it
so fish echoes are clearly displayed with minimal noise on the
screen. Too high a setting not only displays excess noise and
makes it difficult to discriminate wanted echoes but also causes
seabed echoes to be painted in strong colors, resulting in echoes
being masked by seabed reflections. Normally, set the control
somewhere between positions “3” and “5”.

Gain low

Gain proper

Gain high

Figure 2-4 Gain settings and r esulting picture

Measuring Range and Bearing to a T arget

Operate the trackball to place the trackball mark on the target
you want to measure the range and bearing. The range and bear­ing appear at the upper left corner on the screen.

ª

ª

ª

B

Figure 2-5 Location of range and bearing indications

Note: The bearing is shown in either 360° or 180° indication
relative to ship’s heading. In the latter case, bearing (“B”) is
indicated as follows:

B P ------- on the port side
B S ------- on the starboard side

This page is intentionally left blank .

3-1

FINE TUNING THE PICTURE

Eliminating Unwanted Feeble Echoes

Echoes from targets such as seabed and fish return to the trans­ducer in order of distance to them, and when we compare their
intensities at the transducer face, those from nearer targets are
generally stronger when their reflecting properties are nearly
equal. The sonar operator will be quite inconvenienced if these
echoes are directly displayed on the screen, since he can not
judge the actual size of the target from the size of echoes dis­played on the screen. T o overcome this inconvenience, the TVG
function is incorporated. 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 CSH-23/24 has three TVG functions, NEAR, MEDIUM
and FAR, and they mainly compensate for propagation loss on
short, middle and long ranges respectively, centered at the ranges
shown below . The higher the TVG setting the greater the ampli­fication of echoes.

About 100 m

Near

Far

Med

About 400 m

Figure 3-1 Principle of TVG

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:

How to adjust TVG

1. Open sub panel 2.

2. Select TVG•TX.

3. Set TVG NEAR, MEDIUM and FAR to 5.
(These are the standard settings and you can maintain them
in most cases.)

3-2

4. When sea surface reflections or plankton layers disturb the
picture, decrease appropriate TVG option by one or two steps
by pressing – (minus) key.

5. When fish school is located on a long range setting (about
800 meters) which is approaching own ship.

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.

Note: If the above procedure does not produce satisfactory re­sults, the TVG curve can be changed on the SYSTEM menu.
The 30 log setting is normal. The 25 log setting is useful for
searching fish schools near shorelines or shallow waters. The 35
log or 40 log setting raises the gain on a long range and is suit­able for searching tuna, bonito, etc., which are usually searched
with high gain setting.

3-3

Suppressing Seabed T ail

AGC (data setting window: SIGNAL, SIGNAL
PROCESS)

The AGC functions to automatically reduce the receiver gain
only against strong echoes such as the seabed 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 seabed reflections. Do not set it too high; weak echoes may
be missed.

Pulselength (data setting window: TVG•TX,PL)

The pulselength control determines the length 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, 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 seabed reflections. Decrease the
PULSELENGTH setting to shorten the pulselength. For search
of surface and midwater fish in which seabed reflections are not
so strong, use the longest pulselength “9”.

2AGC (data setting window: SIGNAL, SIGNAL
PROCESS)

While it is ideal to suppress seabed echoes with the AGC con­trol 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, unwanted echoes such as the sea­bed.)

If you cannot suppress seabed echoes or sea surface reflections
by the AGC control alone, use the 2AGC control. Normally a
setting of 2 or 3 is suitable. For especially strong echoes, use a
setting of 4 or 5.

0: 2AGC function is off.
1 to 10: Larger the number, the greater the effect of

2AGC.

3-4

Suppressing Seabed and Sea Surface Reflections in
Shallow W aters

Data setting window: TVG•TX, OUTPUT

In shallow fishing grounds with hard or rocky bottom, seabed
reflections often interfere with wanted fish echoes and they can
not be eliminated sufficiently with the aforementioned TVG and
AGC controls, 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 OUTPUT
control instead of turning down the gain. The picture becomes
clearer when output power is reduced rather than when the GAIN
is decreased as illustrated below.

Fish echo

Fish echo
weakened

Fish echo

WRONG
METHOD

CORRECT
METHOD

Reduce OUTPUT
with GAIN kept
constant

TVG and AGC
adjusted with
OUTPUT kept high

Figure 3-2 How to suppr ess seabed and sea surface reflections
in shallow waters

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
electrical noise from other sonars being operated nearby.

Identifying noise source

T o eliminate noise effectively , you should first identify the noise
source as follows:

3-5

1. Turn off the TX switch and operate all on-board equipment
one by one while observing 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, adjust
one of the following:

Interference rejector (data setting window: SIGNAL,
SIGNAL PROCESS)

This control is similar to the interference rejector on echo sound­ers 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 wanted echoes.

Changing Tx cycle (data setting window: TVG•TX,
CYCLE)

When other sonars operate nearby at the same transmission in­terval as that of own ship’s sonar , an interference ring caused by
other sonars is displayed. T o erase the interference ring from the
screen, reduce the CYCLE on the data setting window.

Interference

Tx cycle high Tx cycle lowered

Figure 3-3 How CYCLE works

Note: When the sonar is used in shallow water with the range
set between 60 m and 200 m and Tx cycle at “9”, seabed reflec­tions caused by the 2nd-to-the-last transmission may appear on
near ranges. Reduce the Tx cycle setting to “2” or “3” to sup­press them.

3-6

Setting F-shift (data setting window: SONR•BEAM,
SONAR)

If interference cannot be suppressed by the interference rejector
(IR) or Tx cycle, change the setting of F-SHFT from 1 to 2.

Noise limiter (data setting window: SIGNAL, SIGNAL
PROCESS)

W eak, 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 (NL) can reduce the effects of these
unwanted reflections–raising the setting causes them to become
bluish to background color. Normally a setting of 3 or 4 is suffi­cient.

Adjusting Beamwidth

Beamwidth can be adjusted at SONR•BEAM, BEAM on the
data setting window.

Table 3-1 Beamwidth adjustment menus

Menu Application

HOR

Set to "0" for normal use. The higher the setting the
narrower the beam. This control may be used
together with the AGC and NL controls to suppress
sea surface reflections and seabed echoes.

VER

0: This is the normal beam. The higher the
setting the narrower the beam. Increase the
setting when searching for small fish schools
or checking seabed condition.

1 or 2: Provides a wide beam. It is useful for
tracking quick moving fish schools such as
bonito or tuna.

3: This setting suppresses upper sidelobes (sea
surface reflections) of the beam to make it
easier to search fish schools.

4: This setting suppresses lower sidelobes (seabed
echo) of the beam to make it easier to search
for fish near the seabed.

4-1

MARKS AND DA TA

Marks, Data and Display Mode

Normal display mode

Figure 4-1 Marks and data appearing in the normal display
mode

4-2

Figure 4-2 Marks and data appearing in the normal display
mode w/text

Figure 4-3 Marks and data appearing in the echo sounder
display mode

Normal display mode w/text

Echo sounder combination
display

4-3

Figure 4-4 Marks and data appearing in the history display
mode

Permanently Displayed Marks and Data

Range Data

Shows the range scale set with the RANGE control.

Tilt Angle Data

Mark/Data Description

Trackball Mark Data

→

↓

B

Trackball mark data:

: Slant range

→ : Horizontal range

↓ : Depth

B : Bearing

Bearing is shown in 360° or ±180° indication system, relative to ship’s
heading. In the latter case, "B" is indicated as follows:

B

P.... on the port side

B

S.... on the starboard side

→

→

R

T

°

°

(

)

The tilt angle appears below the range. The tilt angle can be changed in
1° steps within the range of -5° to 60°. In *target lock and automatic
tilt control, the instantaneous tilt angle appears in parentheses.
Accordingly, both are equal when target lock is on. In automatic tilt,
the upper indication shows the tilt angle set by the TILT lever and the
lower indication the instantaneous tilt angle at which the sonar actually
works.

(Continued on next page)

History display

*Requires external sensor.

4-4

Mark/Data Description

Shows own ship’s present position. The direction of the arrow shows
ship’s heading. This mark moves with ship’s movement in the * true
motion mode. On all other modes it is fixed at the screen center.

Own Ship’s Mark

When the CSH-23/24 is connected to a gyrocompass the mark is called
the north mark and points North. If there is no gyrocompass input
it is the heading mark and points in the direction of own ship’s heading.

* North Mark
(or Heading Mark)

Heading Data

This data requires gyrocompass input. Bearing is displayed in
32-azimuth (N, N/E, etc.). Bearing can also be displayed in figures
(for example, "360") by calling up the SYSTEM menu and selecting
BRG READOUT-Course.

Trackball Mark

Sets own ship’s mark location for off-center display; sets location for
mark input. The trackball (or arrow keys on the remote control box)
controls this mark.

Erasable Marks and Data

Mark/Data Description

Latest Event Mark
Data

The position data of the latest event mark, that is, horizontal range (

→),

current depth (↓) and bearing. ( ) shows the latest event mark’s
original depth, and remains unchanged regardless of ship’s movement
or tilt angle. When the event mark is erased the above data disappears
from the screen.
To erase an event mark, place the trackball mark on the event mark
and press the EVENT key.

Latest Event
Mark

Event Mark

1

1

These marks depict important locations. With speed log and gyro­compass connection these marks follow ship’s movement. In the *true
motion mode they are stationary. Ten marks, one latest and nine event
marks, can be entered. When more than ten marks are entered the
oldest is erased to make room for the latest.

→

→

↓

°B

(Continued on next page)

4-5

Range Rings

The range rings are inscribed at intervals of 1/4 of the range in use.
Range ring data is also provided every two range rings. The range ring
interval can be changed from 1/4 to 1/2 through the menu.

Mark/Data Description

Latest Fish Mark

Fish Mark

Fish Mark

These marks are inscribed on the screen by pressing the FISH key.
Ten fish marks can be entered. Each time the key is pressed the fish
mark appearance changes on the screen as follows:

1st press of FISH key
2nd press of FISH key
3rd press of FISH key
4th press of FISH key

Fish Movement

→

Fish movement from the fish speed mark ( ) to the latest fish
mark ( ) is shown by distance, course (C) and speed (S) at the lower
right corner of the screen.

Range and Bearing
Mark Data

These marks are used for monitoring echoes through the loudspeaker
and also for displaying horizontal slice picture. If the *target lock
function is on the bearing marks follow the movement of the target
lock mark.

This data appears when the bearing and range marks are displayed.

Bearing and Range
Marks

Bearing
marker

The heading mark is drawn with a dotted line. *Heading mark data
appears at the top of the screen.

Heading Mark

100
200

Electronic Bearing
Scale

The electronic bearing scale is available with gyrocompass connection.
It rotates with own ship’s movement.

N

S

WE

→

C
S

R

°B

.

(Continued on next page)

4-6

*Ship’s Track Mark

With gyrocompass or speed log connection, own ship’s track is plotted
by a solid line. When the length of the line exceeds five times the
range the oldest part of the track is erased.

Nav Data

Own Ship Data

With appropriate sensors speed (S), course (C), water depth (D) and
water temperature (T) can be displayed on the text window, echo
sounder combination display and history display.

1

3
2

Mark Description

*Tidal
Current
Mark

Tidal Current Data
Normal mode

Combination mode

This mark can be displayed with current indicator input. The tidal
current marks are displayed on the net shooting mark ( ) and net
sonde marks ( ). The tidal current markers shows tidal current
speed in three layers (1—3) selected on the tidal current indicator.
The tidal current speed is shown by the length of the tidal current mark.
Note however that no tidal current mark appears if the tidal current
speed is less than 0.2 kts. Current direction can be shown as "to" or
"from" by selecting CURRENT VEC-Current Flow Dir on the USER
menu. In the normalmode with text, speed, direction and depth of the
current are shown for three layers (C1, C2, C3). In the echo sounder
combination and history modes, only the speed appears (C1, C2, C3),
on the echo sounder combination or history display.

*Net Sonde Data When the net sonde is connected, the depth of the net sonde trans-

mitters appears in the text window, echo sounder, or audio area.

With navigation input position can be displayed in latitude and long­itude, in the normal mode only.

Estimate Mark

Estimate mark
data

The estimate mark gives relative fish quantity. Press the ESTIMATE
key. The estimate mark data appears below the mark. The fish amount
is assessed as between 0 and 100, where if the mark is filled with the
strongest echo color reddish brown, the amount is regarded as "100."
The size of the estimate mark can be changed with MARK SIZE2­Estimate Mark on the SYSTEM menu.

C1 : M

.

C2 : M

.

C3 : M

.

S1 :
S2 :
S3 :

C1 :

.

C2 :

.

C3 :

.

S :
C :
D :
T :

.

.

°

N

°

E

(Continued on next page)

4-7

Mark Description

Target Lock Mark The target lock mark automatically tracks the fish school selected

by the operator. This function requires speed and gyrocompass inputs.

Net Shooting Mark

Net Shooting Data

Press the SHOOT key at the instant you shoot the net to display the
net shooting mark on the display. The net shooting mark is drawn
at own ship’s position the moment the key is pressed and moves on the
own ship’s track mark with ship’s movement. In addition to the
mark, time elapsed and *distance run (in meters) appear from the
time the key is pressed. The mark and its data remain on the screen
until the SHOOT key is pressed again.

Net Sonde Mark

(10 pts. max)

These marks appear on the *ship’s track mark in order at set intervals,
when a net sonde is connected. In the echo sounder combination
mode they also appear in the echo sounder picture, showing depth of
the net sonde transmitters with bars extending vertically from the marks.

E/S Picture Advance
Range Data

Picture advance on the echo sounder combination mode automatically
changes to ship’s speed dependent (advance) rate from the moment
the SHOOT key is pressed, provided there is speed log input. The
E/S picture advance range data shows the distance between the right
and left edges of the echo sounder picture window in the ship’s speed
dependent advance. Since the net length plus wire length set on the
DATA SET menu is used as this distance data, the echograms
obtained during casting the net are displayed just across the E/S
window. Set net length and wire length on NET SONDE in the DATA
SET menu.

Control Setting

When the switches listed below are operated the new setting is noted
at the top of the screen in larger characters for five seconds. The auto
tilt width and auto scan width also appear upon turning on the AUTO
TILT and AUTO SCAN functions.

Control, Display Control, Display

RANGE R
TILT T
GAIN G
TVG TVG
TX TX

AUTO TILT
AUTO SCAN
BRILL
DIM

Color Bar

The 16-color bar appears at the right-hand edge in the echo sounder
and history displays.

E/S Range Scale

or

:

¡ • º º

The range scale for the echo sounder picture appears in the echo
sounder combination mode. You can display it on the right or left side
of the screen by selecting ES/NET REC on the INIT SET/TEST menu.

.

.
.

°

±
±

This page is intentionally left blank .

5-1

MENU OVERVIEW

Many functions are carried out through the menu system, which
consists of the USER, SYSTEM, DA T A SET and INITIAL SET/
DATA menus. The menu you will use most often is the USER
menu.

Menu

How to open

USER

SYSTEM

DATA SET

INIT SET/TEST

Press MENU.
Press and MENU together.

Press and MENU together.
Press MENU and ON together.

(Press and hold down until the buzzer sounds.
All LEDs light while keys are held down.)

USER Menu Operation

The menu operating procedure is the same for all types of menus.
Below is the basic menu operating procedure for the USER menu.

1. Press the MENU key to open the USER menu.

USER MENU

Select item with dc[ \ keys and press MENU key.
Press END key to close menu.

CARD UTILITY

DATA DISPLAY

CURRENT VEC

CARD ECHO DAT

MARK DSP 1

SAVE PICTURE

CARD NET DATA

MARK DSP 2

FUNCTION KEY

HIST DSP/GRPH

Figure 5-1 USER menu

5-2

2. Operate the arrow keys in sub panel 1 to select a menu. As
you move through the menu, each item, initially shown as
blue on gray , reverses to gray on blue to show selection. For
example, select the HIST DSP/GRPH menu.

3. Press the MENU key to display menu selected.

USER MENU
Select item with dc[ \ keys and press MENU key.

Press END key to close menu.

HIST Window DSP

Fish Histogram

AUDIO

ON

PRT/STBD

OFF

H-Slice

HIST DSP/GRPH

Figure 5-2 HIST DSP/GRPH menu

4. Operate the up and down arrow keys in sub panel 1 to select
menu item, and the right and left arrow keys to select option.

5. Press the END key to close the menu. Press the key again to
display picture.

Note: The HELP key provides menu operating information.

Menu screen location and display mode

Menu screen location depends on display mode as shown in the
figure below .

Menu

Normal Mode

Combination Mode

Menu

Figure 5-3 Menu screen location and display mode

5-3

USER Menu Description

Table 5-1 User menu description

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5-4

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5-5

SYSTEM Menu Description

The SYSTEM menu can be displayed by pressing MENU and

c

together.

For help, press the HELP key.

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5-6

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5-7

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5-8

DATA SET Menu Description

The DATA SET menu can be displayed by pressing
MENU +

d

. For help, press the HELP key.

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(Continued on next page)

,,

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15

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Display

color

Level
setting

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104

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18

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5-9

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,,

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,

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,

Before

(R) (G) (B) (R) (G) (G)

Before

Display

Color

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0

5-10

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5-11

INIT SET/TEST Menu Description

The INIT SET/TEST menu can be display by pressing MENU
and ON together .

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(Continued on next page)

5-12

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* Under development

6-1

FUNCTION KEYS

Similar to the quick dialing function on a telephone, the five
function keys (F1–F3) on the main panel record control and menu
settings and replay them back exactly as programmed. The items
you can program are gain, display mode, TX ON/OFF, USER
menu, SYSTEM menu, DATA SET menus and data setting win­dow. The function keys are useful for quickly setting up the so­nar for a specific purpose such as seabed detection.

Programming the Function Keys

1. Tune the sonar as desired.

2. Press the MENU key.

3. Select the FUNCTION KEY menu and press the MENU key .

FUNCTION KEY

ExecuteRegister

USER MENU

Figure 6-1 FUNCTION KEY menu

4. Press the MENU key again.

6-2

FUNCTION KEY

REGISTER

1

USER MENU

Customized settings are registered to FUNCTION keys.
Select key number with↑ ↓ key and press MENU key.
Press END key to return to sub menu.

Figure 6-2 REGISTER menu

5. Press the up or down arrow key in the sub panel 1 to select
the function key to program, then press the MENU key.

6. Press the END key several times to close the menu.

Replaying a Function Key

Press function key (F1–F3) desired.

Function Key Fine Tuning

The function key fine tuning keys ([+], [-]) let you fine tune the
items shown in the table on the next page when a function key is
active.

Note: Register function keys beforehand to use this function.

1. Press desired function key. The lamp above the function key
pressed lights.

2. Press the [-] or [+] key as appropriate; the [-] key to lower
the setting to de-emphasize echoes, and the [+] key to raise
the setting to emphasize echoes.

The lamp above the [-] key lights when the setting is -1 to -4,
and the lamp above the [+] key lights when the setting is 1-5.

6-3

Function Key Fine Tuning

Fine
Adjustment
Item

-4 -3 -2 -1 0 1 2 3 4 5

TVG Near -3 -2 -1 0 0 1 1 2 3 4

TVG Mid -3 -2 -1 0 0 0 1 1 2 3

TVG Far -3 -2 -1 0 0 0 0 1 1 2

Tx Cycle 0 0 0 0 0 0 0 0 0 0

Tx Beamwidth -3 -2 -1 0 0 0 0 0 0 0

Tx Power -2 -1 0 0 0 0 0 0 0 0

Saving Function Key Settings to a Memory Card

1. Press the MENU key.

2. Select the CARD UTILITY menu.

CARD UTILITY Press END key to return to main menu.

List Execute
Save Execute
Delete Execute

Initialize Execute

Figure 6-2 CARD UTILITY menu

3. Select Save and press the MENU key.
Note: If the card has not been initialized, initialize the card by

selecting Initialize and then save.

Replaying Function Key Settings from a Memory Card

Press the CARD REPLAY key on sub panel 1.
Note: When function key settings are replayed from a memory

card, current settings on all function keys are erased. Therefore,
if necessary , save current function key settings to another memory
card before replaying.

This page is intentionally left blank .

7-1

ADVANCED LEVEL OPERATION

Finding Fish School Center

When you want to find the center depth of a fish school, use
the auto tilt function, which automatically scans the tilt angle
within the selected width. There are two automatic scan range,
WIDE and NARROW, which can be selected by the INIT
SET/TEST menu.

Note: NARROW in under development.

Table 7-1 Automatic scan range at menu setting WIDE of
OTHER/INIT SET/TEST menu

)m(egnaR)1(htdiW)2(htdiW)3(htdiWdoireP

001,06 ± 01 °±61 °±02 ° snoissimsnart6yreve

002,051""" snoissimsnart4yreve
004,003""" snoissimsnart2yreve
006,005 ±8° "" "

008 ±6°±21 °±61 ° "

0001 ±4°±8°±21 ° "

0021nahterom ±2°±4°±6° "

For example, when the RANGE control, TIL T lever and WIDTH
key are set to 800 m, 8° and width (1), respectively , the tilt angle
varies at every transmission as follows:

8°→8°→10°→10°→12°→12°→14°→14°→ 12°→12°→10°→10°→
8° →8°→ 6°→6°→4°→4°→2°→2°→4°→4°→6°→6°→8°→
8°

Figure 7-1 Tilt angle setting

7-2

Tracking a Fish School (target lock)

T arget lock, which requires speed and heading inputs, automati­cally tracks an important fish school so that you wonít lose sight
of it on the display screen. Two types of target lock are avail­able: Target Mark or Fish. One may be selected on the SYS­TEM menu.

T racking a fish school

1. Operate the trackball to place the trackball mark on fish school
you want to track.

2. Press the [TARGET LOCK] key to light the lamp above it.
The target lock mark (

.

) appears on the fish school and

tracking begins.

Depth

60° 60°

ABCD

Figure 7-2 Target lock mark and tar get lock data

Note 1: Range offset is applied to both shipís movement and
fish school movement on the screen. Tilt angle is not offset.

Note 2: When the target goes out of the tilt angle range the
lamp above the [T ARGET LOCK] key blinks, and then target
lock is cancelled.

3. T o cancel tar get lock, press the [T ARGET LOCK] key again.

7-3

Target lock mark appearance

The size and thickness of the target lock mark indicates fish speed
and tracking status, as shown below.

Meaning

Target lock
mark appearance

Mark size indicates
relative speed.

Fast
Medium
Slow

(More than 5
Tx cycles)
(Up to 3 Tx
cycles)

Mark thickness shows
tracking status.

Figure 7-3 Target lock mark appearance

Erasing target lock mark

Target lock marks may be erased as follows:

1. Open the sub panel 2.

2. Select DELETE MK.

3. Press the [+] key for DELETE MARK FISH.

Choosing target lock mode

Two types of target lock are available: target mark and fish.
Target mark: Tracks the target lock mark, changing range and

tilt angle according to ship’ s movement. The fish school itself is
not tracked.

Fish tracking: Tracks fish schoolís horizontal movement, chang­ing range and tilt to track movement.

Do the following to select target lock type:

1. Open the sub panel 1.

2. Press the [MENU] key while pressing the up arrow key in
sub panel 1 to display the SYSTEM menu.

3. Select TARGET LOCK, and then press the [MENU] key.

7-4

4. Select Tracking Method, and then press the [MENU] key.

5. Select method desired.

6. Press the [END] key several times to close the menu.

T racking target lock mark

1. Operate the trackball to place the trackball mark on the fish
school you want to track.

2. Press the [TARGET LOCK] key to light the lamp above it.
The target lock mark (

) appears on the fish school and

tracking begins.

Tilt angle is automatically changed to keep the target lock
mark location within the sonar beam.

3. To stop tracking, press the [TARGET LOCK] key again.

Note 1: If the target goes out of the picture or the tilt angle is
greater than 60 degrees the lamp above the [TARGET LOCK]
key flashes to call your attention.

Note 2: Target lock position and data are calculated according
to tilt angle.

Note 3: The bearing mark moves to the target lock mark loca­tion when target lock becomes active. Bearing to the target lock
mark is shown.

Note 4: T ar get lock is temporarily disabled when the distance to
the tracked fish school is less then 40 m. It is resumed once the
distance becomes more than 40 m.

Note 5: The target lock works up to a tilt angle of 60 degrees. In
the drawing below, the tilt angle is fixed at 60 degrees between
B and C. During this period, however, calculation is continu­ously being performed. When own ship comes to point C, target
lock is resumed.

Depth

60° 60°

ABCD

Figure 7-4 Target lock and tilt angle

7-5

Setting target lock conditions

1. Open the sub panel 1.

2. Press the [MENU] key while pressing and holding down the
down arrow key in sub panel 1.

3. Select TARGET LOCK with the arrow keys.

4. Press the [MENU] key.

SYSTEM MENU

TARGET LOCK

Tracking Method TGT Mark Fish

Track Echo Color

8

Choose weakest echo to
track.

Fish Speed Limit 5kt

Set fish speed which
cancels target lock.

Fish Track Window

Set distance at which to
trace fish school track.

Fish Spd Update

15 sec 30 sec 45 sec 60 sec

Choose update interval for
fish speed readout.

Setting

Target LK Window

Normal Large Largest

Choose size of target track
window (not shown).

10m

Auto

Select item with ↑ ↓ ← → keys and press MENU key.
Press END key to close menu.

Setting range: 1 to 10

Setting range: 1 to 15
Setting range: 2 to 20

Figure 7-5 Target lock menu

5. Press the up or down arrow key to choose item; right or left
arrow key to set option.

6. Press the [END] key several times to close the menu.

7-6

Description of target lock items

TrackingMethod
Sets target lock function: target lock mark, fish or automatic.

Track Echo Color
Sets minimum echo signal level to track. A fish school whose

signal level is above the level set here is tracked.
Fish Speed Limit
Sets fish speed at which target lock is cancelled.
Fish Track Window
Set distance at which to track fish schoolís track when it exits

the tracking window.
Fish Speed Update
Selects update interval of fish speed readout; 5,10, 20 or 30 sec-

onds.
Target Lock Window
Sets size of target lock window. The window itself is not show

on the display.
NORMAL: 32 x 32

LARGE: 64 x 64
LARGEST: 128 x 128

7-7

Detecting Fish Schools Aurally

Sometimes you may be preoccupied with other tasks and unable
to concentrate on watching the sonar picture. In such cases it
would be a good choice 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 can detect it on the screen. In addition you may judge whether
the fish school is approaching or going away; the tone becomes
higher when the school is approaching and lowers when the
school is going away.

1. Operate the trackball to place the trackball mark to the direc­tion you want to monitor through the speaker.

2. Press the R/B key. The bearing mark appears on the display.
Echoes in a 30°, 60°, 90°, 180° or 330° sector centering the
bearing mark are monitored through the speaker. You can
adjust speaker volume with the AUDIO control.

3. To change coverage area, open the data setting window (sub
panel 2) and change width of AUDIO SECTOR.

4. To scan the coverage area, open the data setting window,
turn on AUTO SCAN and set scanning WIDTH.

Note: You can display the signal monitored through the loud­speaker on the history display combination window by pressing
the HIST key, if AUDIO is selected on the HIST Window DSP
menu in the USER menu.

7-8

The Fish Alarm

The fish alarm sounds an audible alarm when a fish echo above
a preset strength enters an alarm zone. You set parameters for
the fish alarm at ALM on the data setting window.

ON/OFF: Turn alarm on or off.
Level: Set echo strength level which will activate the alarm.
Zone: Set alarm zone.

1. Open the data setting window and select ALM•AUDIO.

2. Press the + key of the ZONE item.

3. Operate the trackball to place the trackball mark on the start­ing point of the alarm zone.

4. Press the + key.

5. Rotate trackball clockwise to select the end point. The dis­play paints a fan-shaped alarm zone.

6. Press the + key.

Starting

point

End

point

Alarm
zone

Figure 7-6 How to set the fish alarm zone

Note: There must be at least three degrees difference between
the starting and end points to get a fan-shaped alarm zone as
shown in (a) and (b). Otherwise, the unit paints a 360 degree
alarm zone as in (c) and (d).

More than 3°

Within 3°

(a) (b) (c) (d)

7-9

Relocating Fish School for Easy Observation

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-CENT key.

3. To move the own ship mark back to the screen center, press
the OFF-CENT key again.

Own ship
mark

Place trackball
mark here,
for example.

Press the
OFF-CENT key.

Fish
school

Own ship mark
moves to trackball
mark position.

Figure 7-7 How to relocate fish schools

7-10

Comparing of Fish School Concentration

You can get an estimate of the volume of two fish schools by
using the two ESTIMATE keys.

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. Relative vol­ume is shown by a figure between 0 and 100, below the es­timate mark. When inside the mark is filled with reddish
brown, volume figure is “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.

4. To turn off the estimate marks press their respective keys.

Estimate
mark 2

Estimate
mark 2
data

Estimate
mark 1

Estimate
mark 1
data

Figure 7-8 Estimate marks and their data

7-11

Measuring Fish School Speed

To ensure a good haul, it is important to estimate the direction
and speed of the fish school before shooting the net. You can do
this with the FISH key. If the tidal current data is used together
with fish speed data, you can determine the timing of the net
shooting more efficiently . This function requires speed and head­ing inputs.

1. Place the trackball mark on the center of a fish school, and
then press the FISH key . The latest fish mark (

) appears on

the fish school.

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 (

) ap-

pears on the target and the 2nd latest fish mark (

) appears
on the location selected at step 1. At the bottom left corner of
the screen, the distance between the two fish marks, and fish
school course and speed appear.

4. If you want to delete fish marks and fish speed marks, open
data setting window , select DELETE MK and then press the
FISH key.

Latest fish
mark

Latest
fish mark

Fish
movement

Figure 7-9 How to measure fish speed

Note 1: Movement is calculated using ship’ s speed and bearing
inputs. Accordingly , pitching and rolling may affect the calcula­tion. For better 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 more accurate measurement repeat the procedure
two or three times.

7-12

Note 3: Each time the FISH key is pressed the latest fish mark
and ship’s speed mark change in the sequence shown below:

Fish key pressed once:

Fish key pressed twice:

Fish key pressed three times:

Fish key pressed four times:

↓

↓

X

→

↓

X

↓

↓

X

→

↓

→

The Event Mark

The event mark is useful for finding the horizontal range, depth
and bearing to a location some distance from current position.
This function requires speed and heading inputs.

There are two types of event marks: event mark 1 and event
mark 2. 10 of each type of mark can be displayed. The unit marks
the latest one by (

) for event mark 1 and by ( ) for event mark

2. Older event marks are displayed by a cross plus event number
(event mark 1) or an inverted Y with event number (event mark

2). When you enter more than ten event marks, the unit erases
the oldest mark, one by one.

1

2 3

1 2

3

Latest

Figure 7-10 Event marks

7-13

Entering an event mark

1. Set the trackball mark where you want to place an event mark
(latest event mark).

2. Press an EVENT key. The horizontal range, depth and bear­ing to the event mark appear at the bottom left corner of the
screen.

(35)

Stored when
EVENT key is
pressed.

A

B

→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)

You observe picture from
direction of mark.

Bottom left-hand corner of screen

Figure 7-11 Event mark description

Plotting an event mark on the display is equivalent to dropping a
buoy with an anchoring chain that extends from surface to bot­tom. The buoy is fixed at its present geographical location, but
the marker on the display moves to a point where present beam
plane intersects the anchor chain of the buoy as the ship moves
or the tilt angle is changed. This can be said of other marks as
well such as fish mark and trackball mark.

Erasing an event mark

Open the data setting window (sub panel 2) and select DELETE
MK. Press appropriate EVENT key to erase mark.

7-14

True Motion Display

The relative motion display places the own ship mark at the screen
center, and echoes from fish and the seabed move on the screen
relative to own ship’s movement. This means that even when
the ship is dead in water, fish echoes move on the display.

In the true motion display , however , 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 seabed.

Open the data setting window and select SONR•BEAM. Set UP/
TM in the SONAR menu to TM. This function requires speed
and heading inputs.

Although the true motion mode is available for use in all modes,
use in the combination mode is not recommended since the own
ship mark may move into the combination picture area.

Figure 7-12 True motion display

7-15

Plotting Net Location Mark

Before shooting net, you will decide the shoot timing consider­ing the water current direction, distance to fish school and mov­ing direction of the fish school. Use the net location mark as a
guide to decide the timing.

This function requires speed and heading inputs.

1. Place the trackball mark on fish school to be caught.

2. Press the NET COURSE key. The net location mark is de­picted by dotted ring with a diameter equivalent to that of
your purse seine net, being centered on the trackball mark.

Trackball
mark

Net location
mark

Figure 7-13 Net location mark

3. T o adjust the location of net location mark, move the trackball
mark.

4. When the location is finalized, press the NET COURSE key
again. The dotted ring is replaced by solid ring and the lamp
above the NET COURSE key lights.

5. To erase the mark, press the NET COURSE key again.

You can adjust the diameter of the net location mark on NET
SHOOT PLAN in the DATA SET menu.

7-16

Observing Net Behavior

With net sonde connection you can observe net behavior after
the throwing of the net, on the echo sounder combination mode.
Accurate depiction of net sonde position depends on proper set­ting of the distances between net sonde transmitters. You can set
those distances on NET SONDE XMTR in the DAT A SET menu.

This function requires speed and heading inputs.

1. Press the SHOOT key just upon throwing the net into the
water.

Then, the net shooting mark (

) appears at the own ship
mark and also at the right edge of the echo sounder picture.
Afterwards, whenever a net sonde transmitter on the net is
thrown into water, a net sonde mark appears on own ship
mark and moves with ship movement. The depths of net
sonde transmitter units are digitally displayed at the lower
left of the screen after the receiving transducer is placed into
water. The net sonde marks appear also on the echo sounder
picture as below , where the length of vertical line shows the
depth of the net sonde transmitter unit.

2. To erase net sonde mark and associated data, press the
SHOOT key again.

Figure 7-14 Net behavior

7-17

Target Slice Display

Using automatic tilting, the target slice mode displays the echo
inside the estimate mark at several different tilt angles (depth).
To access the target slice display, press the TARGET SLICE
key. The table and illustration below describe the target slice
mode.

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Figure 7-15 Target slice display

This page is intentionally left blank .

8-1

PORT/STARBOARD, HORIZONTAL SLICE

DISPLAYS

The port/starboard display or horizontal slice display may be
displayed by pressing the [HIST] key. The display shown de­pends on the setting of “HIST DSP/GRPH” in the USER menu.

Port/Starboard display

The port/starboard display takes echoes along the bearing (port,
starboard) selected on the SYSTEM menu and displays them on
the lower 1/3 of the screen. If the bearing width is set to 90
degrees, for example, the CSH-23/24 displays echoes in both
port and starboard directions. The picture is scrolled vertically
to downward.

Port/Starboard
Sampling Angle

Display
Sector

Picture Advance
Direction

Port Direction

Starboard
Direction

Port/starboard sampling angle can be set between 0 and
180 degrees. Setting sequence: SYSTEM menu, HIST
DISPLAY, PRT/STBD Sample.
Fixed at 6 degrees.

A

B

↓

↓

↓

B

- - -

- - -

- - -

- - -

Figure 8-1 Port/starboard display

8-2

Horizontal slice display

120 degrees of the picture in the horizontal direction is shown
for a given depth (D) in the horizontal slice window at the bot­tom of the display . The area to display may be selected with the
[R/B] key.

Range Mark

Horizontal Slice Width

D

Bearing Mark

Range Mark
Color Bar

Own Ship
Stern Mark

Picture
Advance
Direction

Cross Cursor

Echo inside
this area is
shown in
window

120 30 123 D22

: Range from own ship to cross cursor in stern

direction.

: Range from own ship to cross cursor in port-

starboard direction.
: Slant range from own ship to cross cursor.
: Depth to cross cursor.

Own Ship Mark

120˚ (Fixed)

Latest Picture

→

→

↓

↓

↓

→

↓

↓

↓

D

Figure 8-2 Horizontal slice display

1. In the normal display, place the trackball mark on the echo
you want to see displayed in the horizontal display , then press
the [R/B] key.

The horizontal slice marker, 120° in width and centered on
the bearing mark, appears on the display . Echoes within the
marker appear in the window at the bottom of the display,
scrolling leftward.

2. Place the trackball mark in the horizontal slice window to
find data. The trackball mark changes to the cross cursor.
Range and depth to the cross cursor are shown.

Note 1: Picture advancement is synchronized with ship’ s speed.
The picture does not advance when the ship is dead in water or
there is no speed input.

Note 2: The width of the horizontal slice marker may be changed
on the SYSTEM menu with H-Slice W idth.

9-1

MEMORY CARD OPERA TIONS

Initializing Memory Cards

Before you save information to a memory card it must be initial­ized (formatted).

1. Press the MENU key to display the USER menu.

2. Select the CARD UTILITY menu.

3. Select Initialize. It takes more than two minutes to initialize
a memory card.

4. Press the END key a few times to display the user menu.

The memory card stores 256k bytes of data. This is equivalent
to about two picture screens or about 20 pictures of echoes in­side the estimate mark. The following data are automatically
saved as system data when the memory card is initialized: panel
setting, function key settings, and menu settings.

9-2

Saving the Picture

You can save either the whole screen or the echo inside the esti­mate mark to the internal memory or a memory card.

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1. Press the MENU key to display the USER menu.

2. Select SAVE PICTURE.

3. Select item to save:

Whole: Saves whole picture to memory card.
Est MK: Saves echo inside the estimate mark to internal

memory. (About 20 pictures can be saved.)

QK Save: Saves whole screen to the internal memory . (One

picture can be saved.)

4. Press the END key to close the USER menu.

5. Press the MEMO key on the main panel.
It takes about two minutes to save a whole screen to a memory

card. During this time the normal picture is displayed but the
unit accepts no key input.

Transferring Echo Data from Internal Memory to
Memory Card

1. Press the MENU key to display the USER menu.

2. Press arrow keys to select CARD ECHO DAT.

3. The display shows all inside-estimate mark pictures stored
in the internal memory. Using the arrow keys select picture
to save to memory card.

4. Press the MENU key. The lamp to the right of the memory
card drive lights while picture data is being saved.

5. Press the END key several times to return to the USER menu.

9-3

Saving Net Shooting Data

How net shooting data is saved

The unit starts accumulating net shooting data when the SHOOT
key is pressed. When net shooting is concluded by pressing the
SHOOT key again, the echo inside the estimate mark and other
net shooting data are saved to the internal memory. Note how­ever that if ship’s movement between pressings of the SHOOT
key is less than 1/3 of the net length the unit judges that net
shooting is suspended and does not save net shooting data.

Transferring net shooting data to memory card

1. Press the MENU key.

2. Press arrow keys to select CARD NET DATA and press the
MENU key.

3. If desired, according to on-screen instructions, select fish
species to be added to net shooting data as a comment, and
then press the MENU key.

4. If desired, enter fish quantity estimate by:

a) selecting number with up or down arrow key
b) selecting place with right or left arrow key
c) registering value by pressing the MENU key .

Net shooting data contents

Net shooting data is comprised of the following:

• Echoes inside estimate mark (the ones which are displayed

the first time the SHOOT key is pressed)

• Ship’s position, date, time

• Ship’s track, net movement, current direction, water depth

and/or water temperature

• Net sonde mark

9-4

Replaying Saved Data

Whole picture or echo inside estimate mark

1. Press the RECALL key (on the main panel).

2. Press the right or left arrow key in sub panel 1 to select item
to replay . The left arrow key selects older data (for example,
data in memory card); the right arrow key newer (for ex­ample, data in internal memory).

3. After viewing picture, press the RECALL key to escape.

Note that the priority order for replay of echo inside estimate
mark is internal memory-saved picture followed by memory card
contents.

Net shooting data

1. Press the NET REPLAY key (on sub panel 1).

2. At the screen bottom, comments are listed. Select the item to
replay .

3. After viewing the data, press the NET REPLA Y key again to
escape.

Deleting Memory Card Contents

You can delete unnecessary data from a memory card.

1. Press the MENU key to display the USER menu.

2. Select the CARD UTILITY menu and press the MENU key .

3. Select the DELETE and press the MENU key. The card con­tents are listed at the screen bottom.

4. Select data to delete.

5. Press the MENU key.

6. Press the END key a few times to close the menu.

10-1

TURNING MARKS, DA T A ON/OFF

You can turn marks and data on or off through the data setting
window or the USER menu.

Turning marks on/off through the data setting
window

Select DELETE MK to delete the following marks:

Event Mark 1
Event Mark 2
Fish Mark
Own Ship Mark
Ship's Track

Each press of + or – deletes
mark selected, one by one.

Each press of + or – deletes
1/5 of overall length of track.

Turning marks on/off through the user menu

The following marks can be turned on/off through the USER
menu:

This page is intentionally left blank .

11-1

INTERPRETING THE DISPLA Y

Seabed Echoes

When the tilt angle is widened, the seabed echo illustrated be­low will appear on the display. When the tilt is narrowed, the
seabed trace becomes wider and weaker. By observing the sea­bed condition on the display, the skipper can prevent net dam­age.

(A) Flat seabed

Tilt angle: 10° to 15°

(B) Flat seabed

Tilt angle: 20° or more

(C) Sloping seabed

Tilt angle: 20° or more

Seabed

Shallow bottom
is displayed in
a strong color
and with a
short tail.

Seabed is displayed
narrower and in
stronger colors when
compared to (A).

Narrow tilt angle
Only half of
vertical beam width
captures the seabed.

The deeper seabed
echo is displayed in
a weak color and
with a long tail.

Figure 11-1 Seabed echoes

11-2

Fish Schools

A fish school appears as a mass of echoes on the screen. The
color of the mass 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: -5° to 10°

(B) Midwater, bottom fish Tilt angle: 30° or more

Fish echo which appears before seabed can be detected.

Tilt angle: -0° to 20°
Fish echo which appears together with
or after seabed can be detected.

Seabed

Fish

school

Sea surface
reflections

Fish

school

Seabed echo not
displayed because
of narrow tilt angle.
Sea surface
reflections are
present.

Fish
school

Large midwater
fish school is
present.

Seabed

Figure 11-2 Fish schools

11-3

Sea Surface Reflections

T o 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 narrow tilt angle is used, sea surface
reflections cover a large area as illustrated below.

Sea surface

Sea surface

15°

Tilt angle
indication

Sea surface
reflections

15°

Figure 11-3 Sea surface reflections

W ake

A wake produced by own ship or another ship can be a strong
reflecting object when a narrow 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 energy , making it dif ficult to sound beyond
the wake.

Own
ship

Other
ship

Wake produced
by other ship

Own ship's
screw noise

Own ship's
screw noise

Own ship's wake
(produced when
own ship turned)

Figure 11-4 W ake appearance on the display

11-4

False Echo by Sidelobe

An ultrasonic wave is emitted only in the direction set by the
TILT lever , 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

Sidelobe

Mainlobe
echo

Sidelobe
echo

The seabed echo
detected by sidelobe
appears at a certain
tilt angle when the
sidelobe points
vertically.

Figure 11-5 Sidelobe echoes

Noise and Interference

Interference from a sonar on another ship appears on the screen
as shown in (A) below. This interference can be suppressed by
changing the CYCLE setting in TVG•TX on the data setting
window. Interference from electrical equipment on board own
ship appears as shown in (B) below. Noise from marine life ap­pears on the display as shown in (C). Electrical interference and
marine life noise can be suppressed with IR on the SIGNAL
menu in the data setting window.

(A) Interference from
other sonar

(B) Electrical
interference

(C) Marine life noise

Figure 11-6 Noise and interference

12-1

WARNINGS

Overvoltage W arning

If the input voltage to this unit rises above 125 VAC, the over­voltage detection circuit activates, an alarm sounds and the mes­sage OVERVOLT AGE appears at the screen center.

If this occurs, retract the transducer , turn the power off and check
the ship’s mains voltage. It should be about 100 VAC.

Unretracted T ransducer Warning

If the transducer is not completely retracted within 30 seconds
after pressing c, an alarm sounds and the message XDCR NOT
RETRACTED! appears at the screen center.

If this occurs, do the following:

1. The power cannot be turned off because the transducer can­not be retracted. Turn off the main breaker for the display
and power supply units to stop operation.

2. Confirm that the net is not tangled in the transducer.

3. Confirm that the breaker inside the raise/lower control box
(mounted on the hull unit) is on.

4. Remove the cover of the raise/lower control box. Push the
(Red) reset button to reset the raise/lower control box.

5. Turn on the power and press c to retract the transducer into
the tank. If it does not retract, the main shaft of the hull unit
may be bent. Turn off the power and manually raise the trans­ducer up to the highest position by using the hand crank.
(See the illustration on the next page.)

12-2

Main Shaft

Hull Unit

Hand Crank

Breaker

Raise/Lower Control Box

Reset Button

Figure 12-1 How to manually raise the transducer

13-1

SELF TESTS

The CSH-23/24 has various self tests to check it for proper op­eration. If a test reveals equipment malfunction do not attempt
to check inside the equipment. There are no user serviceable
parts inside the equipment.

Do not open the cover.

There are no user-serviceable
parts inside. Refer any repair
work to a qualified technician.

WARNING

Opening the Self T est Menu

1. Turn on the power while pressing and holding down the
MENU key.

2. Press arrow keys to select SELF TEST.

INIT/SET MENU SELF TEST

Select item with dc keys and press MENU key.

Single

Continuous

Panel

Execute
Execute

Execute

Color

Gray

SIO

Execute
Execute
Execute

Figure 13-1 SELF test menu

3. Press up or down arrow key to select test desired.

4. Press the MENU key to start test.

13-2

Self T est Description

Single test

The ROM, RAM and other devices of the display
unit are checked once. Control is returned to the
SELF TEST menu when the test is completed.

Continuous test

The devices of the display unit are checked con­tinuously.

START UP TEST

DCON

DRAW

DUAL

ES

SLICE

PSIO

PIF

105-0574-2xx
ROM = OK
RAM = OK
DPRAM = OK
P.W = OK

105-0575-2xx
ROM = OK
RAM = OK

105-0381-2xx
ROM = OK
RAM = OK

105-0382-1xx
ROM = OK
RAM = OK

105-0353-1xx
ROM = OK
RAM = OK

105-0352-1xx
ROM = OK
RAM = OK

105-0415-1xx
ROM = OK
RAM = OK

105-0351-1xx

105-0576-1xx

105-0381-1xx

RX1
1X1

RX2
1X2

105-0226-1xx ROM = OK RAM = OK

ROM = OK RAM = OK
ROM = OK RAM = OK

ROM = OK RAM = OK

CONTI TEST

DCON

DRAW

DUAL

ES

SLICE

PSIO

PIF

ROM
RAM
DROM
DPRAM
P.W
EEPROM
REACT

ROM
RAM
VRAM
DPRAM
CLT

ROM
RAM
DPRAM

ROM
RAM
DPRAM

ROM
RAM
DPRAM

ROM
RAM

ROM
RAM
MEMCARD

= OK
= OK
= OK
= OK
= OK
= OK
= OK

= OK
= OK
= OK
= OK
= OK

= OK
= OK
= OK

= OK
= OK
= OK

= OK
= OK
= OK

= OK
= OK

= OK
= OK
= OK

Figure 13-3 Continuous test

Note: Above program numbers are for
CSH-23.

Figure 13-2 Single test

13-3

Panel test

This test checks the keys of the main and sub pan­els and the remote control box. Press and release
each key . Its on-screen location should display “1”
when the key is pressed and “0” when released. To
escape from the test reset the power .

Color test

This test checks for proper display color . To escape
from the test reset the power.

COLOR TEST

Figure 13-5 Color test

PANEL TEST

/

X

=

Y

=

Figure 13-4 Panel test

13-4

Gray test

This test checks for screen distortion. T o escape from
the test reset the power .

SIO test

This test checks for proper communication between
the display unit and transmitter unit, and requires a
jumper plug. T o escape from the test reset the power .

GRAY TEST

Figure 13-7 SIO test

Figure 13-6 Gray test

SIO TEST

DRAW
IF
PISO

PIF

SIO
SIO
SIO1

SIO2
SIO1

= OK
= OK
= OK

= OK
= OK

13-5

Interface Unit CS-120A Self Test

1. Open the cover of the interface unit.

2. Find DIP switch DP-1 on the lone circuit board. T urn switch
#6 on to start the self test. The results of the check appear on
the digital display beside the DIP switch.

3. Turn the DIP switch off after completion of the test.

678

678

Turn #6 on.

Digital
display

If the readout shows "0" the unit
is functioning properly. If it is
not working properly any of the
following nine numerals or six
alphabets appear.

,,,,,
,,,,,

,,,,,

Figure 13-8 Interface unit CS-120A, cover opened

This page is intentionally left blank .

14-1

INPUT DATA SELECTION

Selection of Data at Interface Unit CS-120A

Nav data and fish data input from external equipment can be
turned on or off at DIP switch DP-1 in the Interface Unit CS­120A.

Ship's speed and bearing (for track plotting, true motion, target lock, etc.)

Input Device S1 S2

Select navigation which feeds
nav data for drawing ship's track
by switch S1 and S2.

Gyrocompass, Speed log OFF OFF
GPS or DR (Note 1) ON OFF
Current Indicator OFF ON
DR or Current Indicator (Note 2) ON ON

Note 1: GPS has priority. Switched automatically from GPS to DR when

GPS data is absent for more than 61 seconds or ship's speed measured with
GPS is 0.2 kts or less. If DR is not available when switched from GPS to
DR, heading readout is fixed at 0 degrees and ship's track is plotted by using
the last GPS data obtained before switching to DR. If you still require speed,
heading data from GPS even though ship's speed is less than 0.2 kts, set the
GPS format to DR. Note however that the heading direction becomes erratic
if the ship's speed is less than 0.2 kts.

Note 2: Use this setting when both DR and current indicator are available.

Normally DR data has highest priority, and is switched to current indicator
data if the DR data is absent for more than 61 seconds. The heading data for
the bearing scale is always provided from the current indicator. When DR
data is taken from GPS be sure to set GPS output format to "DR." GPS with
no "DR" output format cannot be used.

Ship's Position
Input Device S3 S4

Use this position for GPS or DR.
GPS data has priority.

Loran C OFF OFF
GPS or DR (See Note.) ON OFF

Depth (echo sounder, color video sounder, etc.)

Input Device S5

Note 1: For white line pulse when the

depth data is taken from an echo
sounder which does not have digital
depth output.

Note 2: When the depth data is taken

from an echo sounder which has digital
echo output (FE-822, FCV, ED-202,
IF-3000, or IF-5000).

Echo Sounder (Note 1) OFF
GPS or DR (Note 2) ON

S1

12345678

S2
S3
S4
S5

1234

ON

Standard
setting

ON

Figure 14-1 DIP switch settings in the interface unit

14-2

Setting Distances Between Net Sonde Transmitters

T o accurately display the net shooting mark and net sonde mark
position, the distance between transmitters must be correctly
set. This is done on the DATA SET menu.

R1

R0

R2

R0: Length of net from
its end to transmitter1
in meters.
R1: Length of net between
transmitters 1 and 2
in meters.
R2: Length of net between
transmitters 2 and 3
in meters.

Figure 14-2 How to measure distances between transmitters

How to set net sonde transmitter distances

1. Press the MENU key while pressing and holding down d.
The DATA SET menu appears.

DATA SET MENU NET SONDE NET SONDE XMTR

Select item with dc[ \ keys and press MENU key.
Press END key to close menu.

3

0m

0m

0m

0m

0m

Qty

Distance 0

1

2

9

10

:
:
:

:

:
:

t Setting range: 0 to 10 s

t Setting range: 0m to 9990m s

Figure 14-3 DATA SET menu

2. Select NET SONDE and then “Net Sonde XMTR”.

3. Enter number of net sonde transmitters and distances be­tween them.

15-1

MAINTENANCE

Do not open the cover.

There are no user-serviceable
parts inside. Refer any repair
work to a qualified technician.

WARNING

Display Unit Maintenance

Keep magnets and cassette tapes
away from the display unit.

Handle the equipment with care.

Damage can cause corrosion.

DISPLAY UNIT

Clean the screen and filter
regularly. Cover the equipment
when it is not in use.

Heat can damage the
equipment. Allow sufficient
ventilation.

Keep heater away from the
equipment.

Magnets or magnetic material can
can distort the picture.

An anti-static spray may be used
to clean the screen. Do not use
chemical-based cleaners; they can
remove paint and markings.

Figure 15-1 Display unit maintenance

15-2

Hull Unit Maintenance

HULL UNIT

Apply MOLYTONE grease
#2 every six months.

Dry dock ship and clean
transducer face yearly.
Apply single coat of
"MARINE STAR 20 Mod
(Red-N)" anti-foulant to
transducer face to keep
marine life off the transducer.

Raise transducer and coat main
shaft with DAPHAECOROAEX #2
every six months.

CAUTION

The zinc block near the transducer
must be replaced yearly.

The junction between the transducer
and main shaft may corrode, which
can result in loss of the transducer or
water leakage inside the ship.

Figure 15-2 Hull unit maintenance

A-1

MENU TREE

USER Menu

Event Mark 1
Event Mark 2
Fish Mark
On Track Data

Text Window
ES Window

Range/Bearing
Heading Mark
Range Rings
Bearing Scale
Auto Scan Width

Ship's Track
Net Movement Plot
Fish MK Connect
Fish Tracking MK

Fish Track Plot

w/Current Vec
w/Current Vec
w/Current Vec

Current Flow Dir

Hist Window Dsp
Fish Histogram

Save Method

Register

Save

Save

List
Save
Delete
Initialize

ON OFF
ON OFF
ON OFF

Depth Temp OFF
ON OFF
Current Sonde

ON OFF

ON OFF

ON OFF

ON OFF

ON OFF

ON OFF
ON OFF
ON OFF
ON OFF
ON OFF

Audio PRT/STBD H-Slice

ON OFF

ON OFF
ON OFF
ON OFF

From To

Whole Est MK QK Save

Execute

Execute

Execute

Execute

Execute

Execute

Execute

CURRENT VEC

HIST DSP/GRPH

SAVE PICTURE

MARK DSP 1

MARK DSP 2

FUNCTION KEY

CARD NET DATA

CARD ECHO DAT

CARD UTILITY

DATA DISPLAY

USER MENU

A-2

DA TA SET Menu

Setting range: 200-1000 m
ON OFF

Setting range: 0-3000 m
Setting range: 0-1000 m

Execute
Execute
Execute

Execute

Execute

Execute

Execute

CHANGE COLOR

DATA SET MENU

Sonar 1
Sonar 2
Echo Sounder
Marks
Menu

Execute

Execute

NET SHOOT PLAN

Net Diameter
Tilt Interlock

COLOR CURVE

Sonar 1
Sonar 2
Echo Sounder 1
Echo Sounder 2

Net Width

Execute (Qty plus distances)

Setting range: 0-200 m

NET SONDE

Net Sonde XMTR
Net Length
Wire Length

NET PLOT CORR

Layer 1
Layer 2
Layer 3

Setting range: 0%-100%