Furuno CSH-84, CSH-83 User Manual

COLOR SCANNING SONAR

MODEL

CSH-83/84

9-52 Ashihara-cho,9-52 Ashihara-cho,

A

A

*00080806600**00080806600*

*00080806600**00080806600*

*OME13090F00**OME13090F00*

Nishinomiya, JapanNishinomiya, Japan

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

Your Local Agent/DealerYour Local Agent/Dealer

ll rights reserved.

ll rights reserved.

PUB.No.PUB.No. OME-13090OME-13090

(( DAMIDAMI ))

CSH-83/84CSH-83/84

Printed in JapanPrinted in Japan

FIRST EDITION :FIRST EDITION : NOV.NOV. 19971997

F :F : APR.APR. 05,200205,2002

* 0 0 0 8 0 8 0 6 6 0 0 ** 0 0 0 8 0 8 0 6 6 0 0 *

*OME13090F00**OME13090F00*

* O M E 1 3 0 9 0 F 0 0 ** O M E 1 3 0 9 0 F 0 0 *

SAFETY INSTRUCTIONS

WARNING

Do not open the equipment.

Hazardous voltage which can
cause electrical shock exists
inside 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.

Do not disassemble or modify the
equipment.

Fire, electrical shock or serious injury can
result.

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 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.

iiiiiiiiiiiii

i

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.

ii

TABLE OF CONTENTS

FOREWORD

A Word to CSH-83/84 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

OPERATIONAL OVERVIEW

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 DA T 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

iii

FUNCTION KEYS

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

Replaying a Function Key .....................................................................................................6-2

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

iv

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 Test ........................................................................................13-5

INPUT DATA SELECTION

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

Setting Distances Between Net Sonde Transmitters............................................................14-2

MAINTENANCE

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

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

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

SPECIFICATIONS..................................................................................................... SP-1

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

v

This page is intentionally left blank .

FOREWORD

A W ord to CSH-83/84 Owners

Congratulations on your choice of the FURUNO CSH-83/84 Color Scanning Sonar . W e 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-83/84 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 CRT screen.

The main features of the CSH-83/84 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.

• Automatic screen degaussing.

vii

System Configuration

STANDARD OPTION

REMOTE CONTROL BOX

CSH-116

SHIP’S MAINS
100 VAC, 1φ,
50/60 Hz

TRANSMITTER UNIT

CSH-810

DISPLAY UNIT

CSH-230 (CSH-83)

CSH-2400 (CSH-84)

INTERFACE UNIT

CS-120A

REMOTE DISPLAY *

CSH-106

110/115/220/230 VAC,
1φ, 50/60 Hz

SUB DISPLAY *

CSH-236

STEP-DOWN

TRANSFORMER

PT-400

: CSH-83

only

SHIP’S MAINS
100 VAC, 1φ,
50/60 Hz

POWER

SUPPLY UNIT

CSH-880

SHIP’S MAINS
100/110/220 VAC, 1φ,
50/60 Hz

RECEIVER UNIT

CSH-820

HULL UNIT

CSH-81080 (800 mm stroke)

CSH-81120 (1200 mm stroke)

SPEED LOG
AD CONVERTER

NAVIGATOR
CURRENT INDICATOR
COLOR VIDEO SOUNDER

VI-1100A

INTERFACE UNIT

ECHO SOUNDER, COLOR
VIDEO SOUNDER

NET SONDE

FNZ JOINT BOX

CS-170

viii

CONTROL DESCRIPTION

Control Layout on Display Unit and Remote Control Box

POWER TRANSDUCER

OFF ON

SUB PANEL 1

DISP SELECT

1

EVENT

TGT LOCK

ESTIMATE

NET COURSE

1

FISH

1

234

2

d

OFF­CENT

FUNCTION

PUSH-OPEN

SUB PANEL 2

DATA

3

TX

dc

5

F1 F2 F3

NORM E/S HIST RECALL MEMO

-

TARGET
SLICE

SHOOT R/B

NET

COURSE

EVENT1 EVENT2

ESTI-

MATE1

FISH

-

-

+

RANGE GAIN

VERT
SCAN

TILT

SCAN DEPTH

TARGET

LOCK

DIM CONT BRILL AUDIO

ESTI-

MATE2

OFF­CENT

+

+

AUTO

TILT

WIDTH

MAIN PANEL

REMOTE CONTROL BOX

+
–

RANGE

AUTO

TRAIN

GAIN

MEMO

SHOOT

+

–

AUTO

VERT
SCAN

TGT

SLICE

RECALL

TILT

SCAN DEPTH

Figure 1-1 Display unit and
remote control box

1-1

Main Panel

POWER TRANSDUCER

OFF ON

F1 F2 F3

NORM E/S HIST RECALL MEMO

-

+

RANGE GAIN

TARGET
SLICE

SHOOT R/B

NET

COURSE

EVENT1 EVENT2

ESTI-

MATE1

FISH

VERT
SCAN

TARGET

LOCK

ESTI-

MATE2

OFF-

CENT

DIM CONT BRILL AUDIO

-

-

TILT

SCAN DEPTH

+

AUTO

TILT

WIDTH

+

1-2

Figure 1-2 Main panel
Main panel control description

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Sub Panel 1

POWER

OFF

ON

CARD

REPLAY

TRANSDUCER

COLOR

NET

REPLAY

F4

RECALL

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

MENU

END

HELP

TX

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1-4

Sub Panel 2 (data setting window)

ITEM

(TVG•TX selected)

This example shows settings
of TVG and TX.

SONR•BEAM

OPER
P-SET

(TOGGLE)

TVG•TX

SIGNAL

ES

DELETE MK

AUTO

ALM•AUDIO

g

h

CURRENT SETTINGS for item selected (TVG•TX)

NEAR7MEDIUM

+ + + + + +
– – – – – –

Item selection keys
Select item.

TVG TX

8

FAR

9

Setting change keys
Change control setting.

CYCLE

7

PL

8

OUTPUT

9

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

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

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1-6

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1-7

Remote Control Box

elects which display unit to

ontrol in multiple display unit

stallation.

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

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

Selects display range.

Adjusts receiver sensitivity.

Not used.

1

➡

EVENT

ESTIMATE

1

FISH

1

+

–

RANGE

DISP SELECT

FUNCTION

+

3

➡

SHOOT

2

➡

TGT LOCK

NET COURSE

OFF­CENT

234

–

GAIN

AUTO

TRAIN

TGT
SLICE

AUTO

VERT
SCAN

DATA

TX

5

MEMO

RECALL

TILT

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.

Replays a stored picture.

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

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

Not used.

1-8

Figure 1-5 Remote control box

OPERATIONAL OVERVIEW

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.

Turning 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 Transducer

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

d switch. This

*Hull unit with 800mm (full) and 600mm
(mid) protrusions are also available.

2-1

Selecting a Display Mode

The CSH-83/84 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

NORMAL

"DATA DISPLAY" in the USER
menu.

Text window

E/S

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.

2-2

HISTORY

Selecting a Display Range

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

Setting the T ilt 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 vertically, 90
degrees.

T o set a tilt angle, operate the TIL T lever . W atch
the tilt angle indication at the top right corner

R400
T 15

Tilt
angle

on the screen. The tilt angle can be set in one­degree 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.

2-3

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

Seabed

Case 2

Fish School a

Seabed

Case 1

Fish School a

Case 2

Figure 2-1 Fish echo and tilt angle

Case 3

Fish School a

b

Case 3

2-4

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. Gener-
ally speaking, however, midwater fish schools tend to be lar ger
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.

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.

Surface

Tilt angle 0°

Tilt angle 5-6°

12°

Surface

12°

Figure 2-2 Tilt angle and sea surface reflections

2-5

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.

Tilt angle and beam coverage

20(40)
40(80)

60(120)

80(160)

100(200)

Depth (m)

200(400)

Vertical width of sonar beam

100 m100 m

12°

100

(200)

21 m

200

(400)

200 m

42 m

300

(600)

300 m

63 m

Range (m)

400

(800)

0°

5°

10°

15°

Figure 2-3 Tilt angle and beam coverage

2-6

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

Figure 2-4 Gain settings and resulting picture

Measuring 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 and bear­ing appear at the upper left corner on the screen.

ª

ª

ª

B

Figure 2-5 Location of range and bearing indications

Gain high

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

2-7

2-8

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-83/84 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.

Near

About 100 m

Med

About 400 m

Far

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 casees.)

3-1

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

6. 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 is the normal setting. The 25 log setting is useful for
searching fish schools near shorelines or shallow waters.
Ask for FURUNO dealar for detail.

3-2

Suppressing Seabed Tail

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 0 or 1 is suitable. For especially strong echoes, use a
setting of 1 or 2.

0: 2AGC function is off.
1 to 4: Larger the number, the greater the effect of

2AGC.

3-3

Suppressing Seabed and Sea Surface Reflections in Shallow Waters

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 .

WRONG
METHOD

CORRECT
METHOD

Fish echo

TVG and AGC
adjusted with
OUTPUT kept high

Reduce OUTPUT
with GAIN kept
constant

Fish echo
weakened

Fish echo

Figure 3-2 How to suppress 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:

3-4

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.

3-5

Setting 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

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3-6

MARKS AND DA TA

Marks, Data and Display Mode

Normal display mode

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

4-1

Normal display mode w/text

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

Echo sounder combination
display

4-2

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

History display

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

Permanently Displayed Marks and Data

Mark/Data Description

Trackball Mark Data

↓

→
↓
B °

Range Data

R

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:

BP
BS

.... on the port side

.... on the starboard side

Shows the range scale set with the RANGE control.

*Requres external sensor.

Tilt Angle Data

T °

( )

(Continued on next page)

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.

4-3

Mark/Data Description

Own Ship's Mark

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.

* North Mark
(or Heading Mark)

When the CSH-83/84 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.

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

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

Event Mark

1

1

Latest Event Mark
Data

oldest is erased to make room for the latest.

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

→
↓

( )

°

B

from the screen.
To erase an event mark, place the trackball mark on the event mark
and press the EVENT key.

(Continued on next page)

4-4

Mark/Data Description

Latest Fish Mark

Fish Mark

Fish Mark

Fish Movement

→

→

C
S.

Bearing and Range
Marks

Bearing
marker

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 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.

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.

Range and Bearing

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

Mark Data

B ° R

Heading Mark

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

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.

100
200

Electronic Bearing
Scale

N

WE

S

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

(Continued on next page)

4-5

Mark Description

*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.

*Tidal
Current
Mark

3
2

1

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.

Tidal Current Data
Normal mode

C1 : . M
C2 : . M
C3 : . M

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 normal mode with text, speed, direction and depth of the
current are shown for three layers (C1, C2, C3). In the echo sounder

Combination mode

C1 : .
C2 : .
C3 : .

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-

C1 :
C2 :
C3 :

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

Nav Data

S: .
C:
D:
T: .

Own Ship Data

° .N
° .E

Estimate Mark

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."

Estimate mark
data

The size of the estimate mark can be changed with MARK SIZE2­Estimate Mark on the SYSTEM menu.

(Continued on next page)

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.

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

4-6

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.

or

Net Shooting Mark

Net Shooting Data

:

Net Sonde Mark

(10 pts. max)

E/S Picture Advance
Range Data

1 8 0 0

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.

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.

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

Color Bar

E/S Range Scale

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 .

AUTO TILT –
AUTO SCAN –
BRILL
DIM

TX TX .

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

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.

4-7

4-8

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

USER

SYSTEM

DATA SET

INIT SET/TEST

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.

How to open

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

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

Figure 5-1 USER menu

FUNCTION KEY

HIST DSP/GRPH

5-1

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

HIST DSP/GRPH

AUDIO

ON

PRT/STBD

OFF

H-Slice

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

Menu

Normal Mode

Combination Mode

Figure 5-3 Menu screen location and display mode

5-2

USER Menu Description

Table 5-1 User menu description

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(Continued on next page)

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5-3

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5-4

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

DATA SET Menu Description

,

The DA TA SET menu can be display by pressing MENU + d.
For help, press the HELP key.

Menu Item Description

COLOR CURVE Sonar 1

Sonar 2
Echo Sounder 1
Echo Sounder 2

For each of these devices you may change
settings of echo level versus presentation color
curve, which you selected at either "CURVE"
at SIGNAL PROCESS on data setting
window or system menu. Note that Sonar 2 is
not used.

l. First select item to change on COLOR
CURVE sub menu, and then press the
MENU key.

Display

color

15

13

C
o
l
o
r

B
a
r

11

8

4

Level
setting

255

193

104

58

18

(Continued on next page)

,,

0

00 128 255

Level

2. Color curve can be changed at colors no. 4,
8, 11, 13 and 15. Press up or down arrow
key to set cursor on color no. you want to
change curve.

3. Press the right or left arrow key to change
value.

4. Press the END key to terminate color
curve setting. Then, the display shown
below appears. Follow the instructions on
the screen.

Color curve setting is completed.
To save change and close the menu, press
MENU key.
To cancel change and close the menu, press
END key.

5-8

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,

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Before

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

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

Display

Color

,,

,,

,,

,,

Before

(Continued on next page)

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5-9

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5-10

INIT SET/TEST Menu Description

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

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5-11

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5-12

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, DAT A 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 .

USER MENU

Figure 6-1 FUNCTION KEY menu

4. Press the MENU key again.

FUNCTION KEY

ExecuteRegister

6-1

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

1

REGISTER

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.

6-2

Fine
Adjustment
Item

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

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

Function Key Fine Tuning

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.

6-3

This page is intentionally left blank .

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. You can choose angle width from Narrow or
Wide on the INIT/SET TEST menu. (Narrow is available on the
81 kHz, 94 kHz and 107 kHz models.)

Wide width settings

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

snoissimsnart6yreve

snoissimsnart4yreve

snoissimsnart2yreve

6± °

02± °
"
"
"
61± °
21± °

"
"
"
"

001,57

002,051
004,003

006,005

008

0001

0021nahterom

01± °

"
"

8± °
6± °
4± °
2± °

61± °

"
"
"

21± °
8± °
4± °

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°

Tilt Angle

Figure 7-1 Tilt angle setting

How to find fish school center

1. On sub panel 1 or the remote control box, turn on the AUT O
TILT key. The lamp above the key lights on sub panel 1.

2. With the WIDTH key, select scanning width. Auto tilting
begins, with tilt angle set with TILT lever as a center tilt
angle. Successively changing tilt angle is displayed in pa­rentheses at the upper right of the screen.

3. To change center tilt angle, operate the TILT lever.

7-1

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.

Tracking 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 (
tracking begins.

ABCD

Depth

.

) appears on the fish school and

60° 60°

Figure 7-2 Target lock mark and target 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.

7-2

Target lock mark appearance

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

Target lock
mark appearance

Fast
Medium
Slow

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

Mark size indicates
relative speed.

Mark thickness shows
tracking status.

Meaning

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.

7-3

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.

Tracking 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.

ABCD

60° 60°

Depth

7-4

Figure 7-4 Target lock and tilt angle

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

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

Tracking Method TGT Mark Fish

Track Echo Color

Fish Speed Limit 5kt

Fish Track Window

Fish Spd Update

Target LK Window

8

Setting range: 1 to 10

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

10m

15 sec 30 sec 45 sec 60 sec

Normal Large Largest

Auto

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.

Setting

Choose weakest echo to
track.

Set fish speed which
cancels target lock.

Set distance at which to
trace fish school track.

Choose update interval for
fish speed readout.

Choose size of target track
window (not shown).

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

7-5

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

7-6

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.

7-7

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°

7-8

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

Relocating Fish School for Easy Observation

Own ship
mark

Place trackball
mark here,
for example.

Press the
OFF-CENT key.

Fish
school

Own ship mark
moves to trackball
mark position.

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.

Figure 7-7 How to relocate fish schools

7-9

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

7-10

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

) appears on

) ap-

) appears

Latest fish
mark

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

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.

7-11

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:

→

The Event Mark

Fish key pressed three times:

Fish key pressed four times:

↓

X

↓

X

↓

→

↓

X

↓

→

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

1

Latest

Figure 7-10 Event marks

3

2 3

7-12

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.

→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 screen

(35)

Stored when
EVENT key is
pressed.

You observe picture from
direction of mark.

B

A

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.

7-13

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.

7-14

Figure 7-12 True motion display

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.

7-15

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 (
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.

) appears at the own ship

7-16

Figure 7-14 Net behavior

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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7-17

This page is intentionally left blank .

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-83/84 displays echoes in both
port and starboard directions. The picture is scrolled vertically
to downward.

↓

- - -

↓

Port/Starboard
Sampling Angle

↓

B

- - -

- - -

- - -

Display
Sector

Picture Advance
Direction

Port Direction

Port/starboard sampling angle can be set between 0 and

A

180 degrees. Setting sequence: SYSTEM menu, HIST
DISPLAY, PRT/STBD Sample.

B

Fixed at 6 degrees.

Figure 8-1 Port/starboard display

Starboard
Direction

8-1

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

→

↓

Bearing Mark

Echo inside
this area is
shown in
window

Horizontal Slice Width

Cross Cursor

D

Own Ship Mark

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.

Picture
Advance
Direction

→

120 30 123 D22

→

↓

↓

D

↓

: 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.

↓

120˚ (Fixed)

Range Mark

Color Bar

Latest Picture

Own Ship
Stern Mark

8-2

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 Width.

MEMORY CARD OPERATIONS

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.

9-1

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.

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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.

9-2

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

9-3

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.

9-4

TURNING MARKS, DATA 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

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

Own Ship Mark
Ship's Track

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:

User Menu

DATA DISPLAY

MARK DSP1

Display Item

Event Mark 1
Event Mark 2
Fish Mark
On Track Data

Text Window

ES Window
Range/Bearing

MARK DSP 2

CURRENT VEC

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

10-1

10-2

INTERPRETING THE DISPLAY

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°

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

(B) Flat seabed

Tilt angle: 20° or more

(C) Sloping seabed

Tilt angle: 20° or more

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

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

Figure 11-1 Seabed echoes

Seabed

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

11-1

Fish Schools

(A) Sea surface fish

Tilt angle: -5° to 10°

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.

Seabed echo not

Fish

school

Sea surface
reflections

displayed because
of narrow tilt angle.
Sea surface
reflections are
present.

(B) Midwater, bottom fish

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.

Tilt angle: 30° or more

school

Seabed

Fish
school

Large midwater
fish school is
present.

Fish

Seabed

11-2

When the tilt angle is shallow,
the reflection echo from seabed
is weak and the fish echo
which appears from bottom
is easy to find.

Figure 11-2 Fish schools

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.

W ake

Sea surface

15°

Sea surface

15°

Tilt angle
indication

Sea surface
reflections

Figure 11-3 Sea surface reflections

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 difficult to sound beyond
the wake.

Own
ship

Other
ship

Own ship's
screw noise

Wake produced
by other ship

Own ship's
screw noise

Figure 11-4 Wake appearance on the display

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

11-3

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.

11-4

(A) Interference from
other sonar

(B) Electrical
interference

Figure 11-6 Noise and interference

(C) Marine life noise

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 OVERVOLTAGE 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 Transducer 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. T urn 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.)

12-1

TEST/NORMAL
switch

Breaker

Reset Switch

h

h

12-2

Photo No. 1479

RAISE/LOWER CONTROL BOX

Figure 12-1 How to manually raise the transducer

Photo No. 1744

HULL UNIT

SELF TESTS

The CSH-83/84 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.

WARNING

Do not open the cover.

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

Opening the Self Test 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

Color

Gray

SIO

Execute
Execute

Execute

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.

13-1

Self Test 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.

START UP TEST

DCON

105-0574-1xx
ROM = OK
RAM = OK
DPRAM = OK
P.W = OK

DRAW

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

DUAL

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

ES

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

SLICE

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

PSIO

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

PIF

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

RX1

105-0226-001 ROM = OK RAM = OK

1X1
RX2

1X2

105-0351-1xx

105-0576-1xx

105-0381-1xx

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

ROM = OK RAM = OK

Note: Above program numbers are for
CSH-83.

Figure 13-2 Single test

Continuous test

The devices of the display unit are checked con­tinuously.

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

13-2

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

PANEL TEST

=

X

=

Y

Figure 13-4 Panel test

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

COLOR TEST

Figure 13-5 Color test

13-3

Gray test

GRAY TEST

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

Figure 13-6 Gray test

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 .

SIO TEST

DRAW

SIO

= OK

IF

SIO

= OK

PISO

SIO1

= OK

SIO2

= OK

PIF

SIO1

= OK

Figure 13-7 SIO test

13-4

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.

Turn #6 on.

678

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.

, , , , , , , , , ,
, , , , ,

.

678

Digital
display

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

13-5

13-6

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.)

ON

Standard
setting

ON

12345678

1234

S1
S2

S3
S4
S5

Input Device S1 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

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

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

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

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

Input Device S5

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

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).

Figure 14-1 DIP switch settings in the interface unit

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

14-1

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.

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

R1

R2

R0

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
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.

Qty

Distance 0

:

3

:

0m

1

:

0m

2

:

0m

9

:

0m

t Setting range: 0 to 10 s

t Setting range: 0m to 9990m s

d

.

14-2

10

:

0m

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.

MAINTENANCE

Display Unit Maintenance

WARNING

Do not open the cover.

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

Handle the equipment with care.

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

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

Keep magnets and cassette tapes
away from the display unit.

Damage can cause corrosion.

Keep heater away from the
equipment.

Heat can damage the

DISPLAY UNIT

equipment. Allow sufficient
ventilation.

Figure 15-1 Display unit maintenance

Magnets or magnetic material can
can distort the picture.

15-1

Hull Unit Maintenance

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.

HULL UNIT

Apply MOLYTONE grease
#2 every six months.

Raise transducer and coat main
shaft with DAPHAECOROAEX #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.

Figure 15-2 Hull unit maintenance

15-2

MENU TREE

USER Menu

USER MENU

CARD UTILITY

CARD ECHO DAT

CARD NET DATA

FUNCTION KEY

DATA DISPLAY

MARK DSP 1

List
Save
Delete
Initialize

Save

Save

Register

Event Mark 1
Event Mark 2
Fish Mark
On Track Data
Text Window
ES Window

Range/Bearing
Heading Mark

Execute
Execute
Execute

Execute

Execute

Execute

Execute

ON OFF
ON OFF
ON OFF
Depth Temp OFF
ON OFF
Current Sonde

ON OFF
ON OFF

MARK DSP 2

HIST DSP/GRPH

CURRENT VEC

Range Rings
Bearing Scale

Auto Scan Width

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

Hist Window Dsp
Fish Histogram

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

Current Flow Dir

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

SAVE PICTURE

Save Method

Whole Est MK QK Save

A-1

DATA 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%

A-2