Furuno CSH-23F, CSH-24F User Manual

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COLOR SCANNING SONAR

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MODEL

CSH-23F/24F

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

00080818601

**00080818601

00080818601

**00080818601

OME

13050

**OME

13050

**OME

13050

**OME

13050

Nishinomiya 662-8580, JAPANNishinomiya 662-8580, JAPAN

Telephone :Telephone : 0798-65-21110798-65-2111 FaxFax 0798-65-42000798-65-4200

ll rights reserved.

Printed in JapanPrinted in Japan

Pub. No.Pub. No. OME-13050OME-13050

Your Local Agent/Dealer Your Local Agent/Dealer

IRST EDITION :

IRST EDITION :NOVNOV.. 19971997

GG :: FEBFEB.. 24, 200524, 2005

Thepaperusedinthismanual iselementalchlorinefree.

(( DAMIDAMI ))

CSH-23F/24FCSH-23F/24F

* 0 0 0 8 0 8 1 8 6 0 1 ** 0 0 0 8 0 8 1 8 6 0 1 *

* O M E 1 3 0 5 0 G 0 0 ** O M E 1 3 0 5 0 G 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.

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.

Personal injury can result if the equipment is used as a chair or stepping stool, for example.

Do not place objects on the top of the equipment.

The equipment can overheat or personal injury can result if the object falls.

WARNING LABEL Warning labels are attached to the equipments. Do not remove the lables. If the labels are missing or damages, contact a FURUNO agent or dealer about replacement.

WARNING

To avoid electrical shock, do not remove cover. No user-serviceable parts inside.

TYPE： 86-003-1011-0 CODE No.： 100-236-230

DANGER

Electrical shock hazard. Turn off power before servicing.

TYPE： 03-160-1042-0 CODE No.： 100-302-750

FOREWORD

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

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

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

SYSTEM CONFIGURATION

Control Layout on Display Unit, Processor 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 A n gle........................................................................................................................... 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

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

VERTICAL SCANNING DISPLAY

Using Vertical Scanning Display ...........................................................................................................8-1

Application to Bonito and Tuna Fishing................................................................................................8-2

PORT/STARBOARD, HORIZONTAL SLICE DISPLAYS

Port/Starboard display...........................................................................................................................9-1

Horizontal slice display.........................................................................................................................9-2

MEMORY CARD OPERATIONS

Initializing Memory Cards..................................................................................................................10-1

Saving the Picture...............................................................................................................................10-2

Transferring Echo Data from Internal Memory to Memory Card.........................................................10-2

Saving Net Shooting Data...................................................................................................................10-3

Replaying Saved Data.........................................................................................................................10-4

Deleting Memory Card Contents .........................................................................................................10-4

TURNING MARKS, DATA ON/OFF .................................................................11-1

INTE RPRETIN G THE DIS P LAY

Seabed Echoes....................................................................................................................................12-1

Fish Schools.......................................................................................................................................12-2

Sea Surface Reflections ......................................................................................................................12-3

Wake ..................................................................................................................................................12-3

False Echo by Sidelobe.......................................................................................................................12-4

Noise and Interference........................................................................................................................12-4

WARNINGS

Overvoltage Warning...........................................................................................................13-1

Unretracte d Tra ns d ucer W arning.......... .. ............ ... ............ ........... ... ........... ... ............ ..........13-1

SELF TESTS

Opening the Self Test Menu ................................................................................................ 14-1

Self Test Description............................................................................................................14-2

Interface Unit CS-120A Self Test........................................................................................14-5

INPUT DATA SELECTION

Selection of Data at Interface Unit CS-120A.......................................................................15-1

Setting Distances Between Net Sonde Transmitters............................................................15-2

MAINTENANCE

Display Unit Maintenance....................................................................................................16-1

Hull Unit Mainten a nc e.............. ............ ... ........... ... ............ ........... ... ........... ............ ... ..........16-2

Replacement of Fuse, Memory Card Battery....................................................................... 16-3

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

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

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

This page is intentionally left blank .

FOREWORD

A Word to CSH-23F/24F Owners

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

For over 50 years FURUNO Electric Company has enjoyed an enviable reputation for quality marine electronics equipment. This dedication to excellence is furthered by our extensive global network of agents and dealers.

This equipment is des i gned and cons tructed to meet th e rigorous de mands 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 CSH-23F/24F is a full-circle, multibeam electronic color scanning sonar which detects and di splays fish schools on a 15/21 inch no n-glare, high- resolution c o l o r CRT. Also, the CSH-23F has two type s of models: a mo de l with displ ay unit and a mo de l with processor unit and no monitor (monitor is supplied by user).

The main fe atures of the CSH-23F/24F are

• Vivid 16-color, echo strength dependent display for improved recognition of seabed,

fish school concentration, distribution and volume.

• Memory card for storage and replay of sonar picture (whole screen or echo inside

estimate mark), net s hooting data, sh ip’s track, tidal current data, etc.

• Function keys for customized operation.

• Menu-driven operation with help screen.

• Wide variety of display modes: normal sonar picture, echo sounder combination,

historical display combination, port/starboard display, horizontal slice, target slice, and unique vertical scanning.

• Various marks and alphanumeric fishing information for intuitive operation.

• Remote control box for armchair control of major functions.

• High power MOS FET transmitter for reliable operation.

• Automatic screen de gausser

vii

System Configuration

STANDARD OPTION

REMOTE CONTROL BOX

CSH-116

SHIP'S MAINS 100 VAC, 1 50/60 Hz

SUPPLY UNIT

CSH-380B

TRANSMITTER UNIT

CSH-310

POWER

DISPLAY UNIT

CSH-230F (CSH-23F) CSH-2400F (CSH-24F)

RECEIVER UNIT CSH-220A

PROCESSOR UNIT

CSH-235F

INTERFACE UNIT

CS-120A

MONITOR (MU-151C) or COMMERCIAL MONITOR

110/115/220/230 VAC, 1

, 50/60 Hz

VI-1100A

INTERFACE UNIT

SUB DISPLAY*

CSH-236

SPEED LOG AD CONVERTER

NAVIGATOR CURRENT INDICATOR COLOR VIDEO SOUNDER

*: CSH-23F only

SHIP'S MAINS 100 VAC, 1 50/60 Hz

STEP-DOWN

TRANSFORMER

PT-400

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

viii

ECHO SOUNDER, COLOR VIDEO SOUNDER

FNZ JOINT BOX

CS-170

HULL UNIT

CSH-21080 (800 mm stroke) CSH-21120 (1200 mm stroke) CSH-21160 (1600 mm stroke)

NET SONDE

CONTROL DESCRIPTION

Control Layout on Display Unit, Processor Unit and Remote Control Box

POWER TRANSDUCER

OFF ON

SUB PANEL 1

POWER TRANSDUCER

OFF ON

RANGE GAIN

VERT SCAN

TILT

SCAN DEPTH

TARGET

LOCK

DIM CONT BRILL AUDIO

ESTIMATE2

OFFCENT

AUTO

TILT

WIDTH

PUSH-OPEN

RANGE GAIN

VERT SCAN

TILT

SCAN DEPTH

TARGET

LOCK

DIM CONT BRILL AUDIO

ESTIMATE2

OFFCENT

WIDTH

F1 F2 F3

NORM E/S HIST RECALL MEMO

TARGET SLICE

SHOOT R/B

NET

COURSE

EVENT1 EVENT2

ESTI-

MATE1

FISH

Same as Sub-panel of the display unit

AUTO

TILT

MAIN PANEL

+++-

DISP

F1 F2 F3

NORM E/S HIST RECALL MEMO

TARGET SLICE

SHOOT R/B

NET

COURSE

EVENT1 EVENT2

ESTI-

MATE1

FISH

SUB PANEL 2

*: The contrast and billiance

controls are disable. Adjust them at a monitor.

Display unit Processor unit (CSH-23F only)

DISP SELECT

EVENT

TGT LOCK

ESTIMATE

NET COURSE

FISH

234

RANGE

AUTO

TRAIN

OFFCENT

FUNCTION

GAIN

AUTO

BOOST

SHOOT

SLICE

DATA

MEMO

RECALL

TGT

TILT

SCAN DEPTH

Remote contr o l bo x

Figure 1- 1 Display unit, process o r 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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Control Function

NORM, E/S, HIST (Mode keys)

RECALL, MEMO RECALL: Replays saved picture.

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

VERT SCAN Turn vertical scan display on and off. SHOOT Press when net is cast. The net shooting mark, *net sonde marks and

R/B Provides range and bearing data from own ship to a target. Select

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

MEMO: Saves picture to memory card or internal memory.

several different tilt angles.

*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.)

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 the SHOOT

key of the remote control box. ESTIMATE 1, 2 Compare volume of two fish schools. FISH Measures fish school speed. OFF-CENT Relocates selected target. Lamp above key lights when off-center

function is on. 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.

1-3

Sub Panel 1

POWER TRANSDUCER

ONOFF

END

HELP

CARD

REPLAY

COLOR

NET

REPLAY

RECALL

F5F3F2F1

MEMOHISTE/SNORM

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.

cd[ \

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.

1-4

Sub Panel 2 (data setting window)

This example shows settings of TVG and TX.

(TVG

ITEM

TX selected)

SONR Q BEAM

OPER P-SET

(TOGGLE)

TVG Q TX

SIGNAL

DELETE MK

AUTO

ALM Q AUDIO

CURRENT SETTINGS for item selected (TVG Q TX)

NEAR7MEDIUM

+ + + + + +

- - - - - -

Item selection keys Select item.

TVG TX

FAR

Setting change keys Change control setting.

CYCLE

OUTPUT

Main

Item

TVG ● TX

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

Figure 1-4 Sub panel 2

Note: The sub-panel 2 for the processor unit is arranged vertically.

Sub panel 2 control description

Item

Main Sub

NEAR 0-9

TVG

TRANSMIT

MEDIUM 0-9

FAR 0-9

CYCLE 0-9

PL 0-9

Setting

Range

Description

Adjusts receiver gain within 100 m.

Adjusts receiver gain between 100 m and 400 m.

Adjusts receiver gain beyond 400 m.

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

Sets Tx pulselength. 9 is normal setting.

Normal

Setting

(Continued on next page)

OUTPUT 0-9

Sets Tx output power. 9 is maximum power.

1-5

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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.

➡

EVENT

ESTIMATE

FISH

–

RANGE

DISP SELECT

FUNCTION

➡

SHOOT

➡

TGT LOCK

NET COURSE

OFFCENT

234

–

GAIN

AUTO

TRAIN

TGT SLICE

AUTO

VERT SCAN

DATA

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

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

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 of the transducer.

The equipment may become damaged.

CAUTION

or d switch during raising

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

2-1

Selecting a Display Mode

The CSH-23F/24F 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 center 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.

To set a tilt angle, operate the TILT lever. W atch the tilt angle indication at the top right

R400 T 15

Tilt angle

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.

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.

Seabed

Case 1

Case 1 Case 2

Case 2

Fish school aFish school a

Seabed

Figure 2-1 Fish echo and tilt angle

Case 3

Fish school a

Case 3

}

Seabed

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. Generally 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°

15°

Surface

15°

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

15°

100

(200)

26 m

200

(400)

200 m

52 m

300

(600)

300 m

78 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 “7”.

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.

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-23F/24F 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 cases.)

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. 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.Ask for FURUNO dealer 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 2 or 3 is suitable. For especially strong echoes, use a setting of 4 or 5.

AR, -4 to -1:Adjusts horizontal beamwidth.

2AGC function is fixed at “3”. 0: 2AGC function is off. 1 to 5: 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 r eflections 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 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

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

HOR

VER

sea surface reflections and seabed echoes. Note that when 2AGC function is on the horizontal beamwidth is adjusted at the 2AGC item on the data setting window. Settings AR and -4 to -1 adjust the beamwidth.

About 500m

3, 4

3-6

In order to reduce surface reflection VER controls upper part of the beam dents near own ship as shown the above.

MARKS AND DAT A

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

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

Shows the range scale set with the RANGE control.

*Requires external sensor .

Tilt Angle Data

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)

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-23F/24F is connected to a gyrocompass the mark is calledthe 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

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. ( 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)

→),

) shows the latest event mark’s

4-4

Mark/Data Description

Latest 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 Mark Data

B ° R

Heading Mark

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

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

(Continued on next page)

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

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

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

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 normalmode 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-

S1 : S2 : S3 :

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

Nav Data

S : . C : D : T : .

Own Ship Data

° . N ° . E

Estimate Mark

Estimate mark data

(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.

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.

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.

Net Shooting Mark

Net Shooting Data

Net Sonde Mark

(10 pts. max)

E/S Picture Advance Range Data

z , / /

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

This page is intentionally left blank .

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.

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

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.

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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5-4

SYSTEM Menu Description

The SYSTEM menu can be displayed by pressing MENU and

together.

For help, press the HELP key.

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5-6

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5-7

DATA SET Menu Description

The DATA SET menu can be displayed by pressing MENU +

. For help, press the HELP key.

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193

104

(Continued on next page)

00 128 255

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5-8

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Display

Color

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(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 displayed 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

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. There are two automatic scan range, WIDE and NARROW, which can be selected by the INIT SET/TEST menu. Note that the NARROW is under develepment.

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

)m(egnaR)m(egnaR

)m(egnaR)m(egnaR)1(htdiW)1(htdiW

)m(egnaR

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° "

)1(htdiW)1(htdiW)2(htdiW)2(htdiW

)1(htdiW

)2(htdiW)2(htdiW)3(htdiW)3(htdiW

)2(htdiW

)3(htdiW)3(htdiWdoirePdoireP

)3(htdiW

doirePdoireP

doireP

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 Table 7-2 Automatic scan range at menu setting NARROW of

OTHER/INIT SET/TEST menu

)m(egnaR)m(egnaR

)m(egnaR)m(egnaR)1(htdiW)1(htdiW

)m(egnaR

001,06 ±4°* ±6°* ±8°*

002,051 ±2°±4°* ±6°* 004,003 ±1°±2°±4°* 006,005""±3°

008"""

0001"""

0021nahterom"""

)1(htdiW)1(htdiW)2(htdiW)2(htdiW

)1(htdiW

)2(htdiW)2(htdiW)3(htdiW)3(htdiW

)2(htdiW

Note: Period equals

)3(htdiW)3(htdiW

)3(htdiW

one transmission. Tilt angle changes in 2° steps for asterisk-marked width; 1° steps for all other widths.

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. To cancel target lock, press the [TARGET 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 T ARGET 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

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:

↓

→

↓

→

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

Latest

Figure 7-10 Event marks

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.

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

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VERTICAL SCANNING DISPLAY

The vertical scanning display provides a wide fish eye view of underwater conditions from the surface to the seabed. The figure below illustrates the concept of the vertical scanning mode, in comparison with the normal sonar beam. The vertical scanning mode helps you keep fast moving fish such as bonito and tuna within the sonar beam.

Figure 8-1 The concept of the vertical scanning mode

Using Vertical Scanning Display

1. Press the VERT SCAN key on the main panel. The lamp above the switch lights, indicating that the vertical scanning function is ON.

2. Press the TIL T/SCAN lever to set a scanning depth. Your selection appears at the upper right-hand corner of the display like “D120M”. Select a scanning depth which does not display the seabed, so you won’t hide any echoes in the seabed. When the seabed is hard and rocky, it may appear even if may appear even if the scanning depth is set shallower than the seabed depth. In such case, set the scanning depth further shallower.

3. T o suppress sea surface reflections, open the data setting window and set the VER BEAM in the SONR•BEAM item to other than 0. Upper part of the beam dents as shown at right.

4. To escape from the vertical scanning mode, press the VERT SCAN key.

Figure 8-2 Vertical scanning

8-1

Display Indications

Figure 8-3 Indications of vertical scanning display

Application to Bonito and Tuna Fishing

Tracking of bonito and tuna presents a special challenge to the sonar operator: He must try to keep them within the sonar beam, a formidable task considering their high speed and penchant for leaping and diving. The CSH-23F/24F, however, with its wide vertical scanning beam, makes this task easier.

Searching

Neither the naked eye nor binoculars can continually track fish schools which make lightning quick runs between the surface and midwater. A sonar , however, provides a continuous view of several hundred meters of sea area around the boat, both at the surface and below it.

8-2

Tracking

If you are visually tracking a fish school which characteristically leaps and dives regularly , or a school with a flock of birds hovering over it, the school will scatter once the vessel approaches, thus you will lose sight of the school. The CSH-23F/ 24F provides continuous pictures of underwater conditions, so you can always know where a fish school is. For tracking the schools which leap and dive often the vertical scanning mode is especially effective.

Figure 8-4 Tracking

Approaching

• The sonar lets you view fish school movement continuously, thus you can approach a school confident of a good catch.

• While a flock of birds hovering over the sea surface is usually a good indication of the presence of a fish school, the sonar can better verify fish school size.

Figure 8-5 Approaching

8-3

Catching

While the sonar operator monitors the sonar for other fish schools, the crew can scatter bait and water to attract fish to the boat.

Figure 8-6 Catching

8-4

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-23F/24F 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

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.

Figure 9-1 Port/starboard display

Starboard Direction

9-1

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

Own Ship Mark

Figure 9-2 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

→

↓

: 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

9-2

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.

10-1

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.

10-2

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 DAT A 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

10-3

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 REPLAY 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 followed by 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.

10-4

TURNING MARKS, DATA ON/OFF

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

MARK DSP 1

DATA DISPLAY

User Menu Display Item

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

MARK DSP 2

CURRENT VEC

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

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

Turning marks on/off through the user menu

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

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

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

11-1

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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

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 12-1 Seabed echoes

Seabed

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

12-1

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 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.

school

Seabed

Fish school

Large midwater fish school is present.

Fish

Seabed

12-2

Figure 12-2 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 12-3 Sea surface r eflections

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 12-4 Wake appearance on the display

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

12-3

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 12-5 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.

12-4

(A) Interference from other sonar

(B) Electrical interference

Figure 12-6 Noise and interference

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 of f 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 can-

not 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 of f the power and manually raise the transducer up to the highest position by using the hand crank. (See the illustration on the next page.)

13-1

Breaker

Reset Button

Raise/Lower Control Box

Hand Crank

Figure 13-1 How to manually raise the transducer

Main Shaft

Hull Unit

13-2

SELF TESTS

The CSH-23F/24F has various self tests to check it for proper operation. If a test reveals equipment malfunction do not attempt to check inside the e quipment. Th e re 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 keys and press MENU key.

Single

Continuous

Panel

Color

Gray

SIO

Execute

Execute Execute

Figure 14-1 SELF TEST menu

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

4. Press the MENU ke y to start test.

14-1

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

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

105-0226-1xx 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-23F .

Figure 14-2 Single test

Continuous test

The devices of the display unit are checked continuously.

CONTI TEST

DCON

DRAW

DUAL

SLICE

PSIO

PIF

ROM RAM DROM DPRAM P.W EEPROM REACT

ROM RAM VRAM DPRAM CLT

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

Figure 14-3 Continuous test

14-2

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

Figure 14-4 Panel test

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

COLOR TEST

Figure 14-5 Color test

14-3

Gray test

GRAY TEST

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

Figure 14-6 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

SIO

= OK

PISO

SIO1

= OK

SIO2

= OK

PIF

SIO1

= OK

Figure 14-7 SIO test

14-4

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 14-8 Interface unit CS-120A, cover opened

14-5

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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.)

Standard setting

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 15-1 DIP switch settings in the interface unit

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

15-1

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

in meters. R2: Length of net between transmitters 2 and 3 in meters.

Figure 15-2 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

t Setting range: 0 to 10 s

t Setting range: 0m to 9990m s

15-2

Figure 15-3 DATA SET menu

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

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

Furuno CSH-23F, CSH-24F User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SAFETY INSTRUCTIONS

TABLE OF CONTENTS

FOREWORD

A Word to CSH-23F/24F Owners

Features

System Configuration

CONTROL DESCRIPTION

Control Layout on Display Unit, Processor Unit and Remote Control Box

Main Panel

Sub Panel 1

Sub Panel 2 (data setting window)

Remote Control Box

OPERATIONAL OVERVIEW

Turning the Power On/Off

Adjusting Screen Brilliance, Control Panel Backlighting

Lowering the Transducer

Selecting a Display Mode

Selecting a Display Range

Setting the T ilt Angle

Adjusting the Gain

Measuring Range and Bearing to a Target

FINE TUNING THE PICTURE

Eliminating Unwanted Feeble Echoes

Suppressing Seabed Tail

Suppressing Seabed and Sea Surface Reflections in Shallow Waters

Rejecting Sonar Interference and Noise

Adjusting Beamwidth

MARKS AND DAT A

Marks, Data and Display Mode

Permanently Displayed Marks and Data

Erasable Marks and Data

MENU OVERVIEW

USER Menu Operation

USER Menu Description

SYSTEM Menu Description

DATA SET Menu Description

INIT SET/TEST Menu Description

FUNCTION KEYS

Programming the Function Keys

Replaying a Function Key

Function Key Fine Tuning

Saving Function Key Settings to a Memory Card

Replaying Function Key Settings from a Memory Card

ADVANCED LEVEL OPERATION

Finding Fish School Center

Tracking a Fish School (target lock)

Detecting Fish Schools Aurally

The Fish Alarm

Relocating Fish School for Easy Observation

Comparing of Fish School Concentration

Measuring Fish School Speed

The Event Mark

True Motion Display

Plotting Net Location Mark

Observing Net Behavior

Target Slice Display

VERTICAL SCANNING DISPLAY

Using Vertical Scanning Display

Application to Bonito and Tuna Fishing

Port/Starboard display

Horizontal slice display

MEMORY CARD OPERATIONS

Initializing Memory Cards

Saving the Picture

Transferring Echo Data from Internal Memory to Memory Card

Saving Net Shooting Data

Replaying Saved Data

Deleting Memory Card Contents

TURNING MARKS, DATA ON/OFF

INTERPRETING THE DISPLAY

Seabed Echoes

Fish Schools

Sea Surface Reflections

W ake

False Echo by Sidelobe

Noise and Interference