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

SAFETY INSTRUCTIONS

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TABLE OF CONTENTS

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3D MODE

CUSTOM MODE KEYS ( 1 , 2 , 3 )

MENU SETTINGS

MAINTENANCE & TROUBLESHOOTING

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FOREWORD

Congratulations on your choice of the FURUNO CH-37 Color

Sector Scanning Sonar! We are confident that you will enjoy many years of trouble-free operation with this fine piece of equip- ment.

For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for quality and reliability throughout the world. This dedication to excellence is furthered by our exten- sive global network of agents and dealers.

The CH-37 is the newest addition to FURUNO???s CH family of sonars. This new sonar is especially designed to provide faster detection capability by sector scanning method and improved operation by rotary controls and trackball. The sonar picture is presented in 16 or 8 colors on a high resolution CRT. The ex- cellent signal processing technique and improved receiver bring you a clear and high-quality picture on a 15-inch screen.

We would appreciate feedback from you, the end-user, about whether we are achieving our purpose.

Thank you for considering and purchasing FURUNO equip- ment.

Features

???Multi sector scanning provides quick coverage of full 360?? area in just 8 transmissions.

???PPI operation can be selected for superior detection range and bottom fish sounding.

???Custom mode keys provide desired sonar settings by one key stroke.

???Selectable background color lessens eye fatigue in both daytime and nighttime operations.

???Selection of frequencies - 60, 81, 113, 162 kHz.

???Trackball offers easy-to-use operation for marker settings.

???Quick training and quick raise/lower operation.

???Vertical mode presents a vertical section of underwater con- ditions.

???3D mode shows vertical echoes like a graphic track plotter.

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SYSTEM CONFIGURATION

NOTE 1: Two sets of rectifiers are necessary for AC mains.

NOTE 2: DC ship's mains only. For AC ship's mains, the power is supplied directly from the rectifier unit to the trans- ceiver unit.

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MENU TREE

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OPERATIONAL OVERVIEW

1.1 Control Description

1-1

Figure 1-2 Sub panel 1 and sub panel 2

1-2

1.2 Turning the Power On/Off

Power on

Press the PWR switch on the main panel. The lamp above the switch lights to show that power is turned on.

Power off

Retract the transducer with the g key on the main panel. The lamp above the switch lights while the transducer is being raised and goes off when the transducer is fully raised. Then, press the PWR switch.

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

1.3 Adjusting Screen Brilliance, Panel Backlighting

The BRILL control adjusts screen brilliance and the DIMMER controls adjusts panel backlighting. These controls are on the sub panel 1.

1.4 Lowering the Transducer

Press the h switch on the main panel to lower the transducer.

The lamp above the switch blinks while the transducer is being lowered and lights when the transducer is fully lowered.

CAUTION

Observe maximum allowable ship???s speed of 18 knots during operation and 15 knots while raising/lowering transducer, to prevent damage to the transducer.

1-3

1.5 Presentation Mode

Five presentation modes are available with the MODE control:

Normal sonar, Normal sonar + combination, Expanded sonar,

Vertical fan mode or Vertical fan mode + combination and 3D display mode (front and slant perspective views).

Normal sonar mode

Normal full circle picture appears on the entire screen.

Normal sonar + E/S, vertical fan or sonar

Normal full circle picture appears at the upper 2/3 of the screen; the echo sounder, vertical fan or sonar on the lower 1/3. To select the picture to display in the lower 1/3, see DUAL MODE on page 6-9.

(Echo sounder required to display echo sounder picture).

Expanded sonar mode

Zoomed picture appears on the entire screen. The echo size on the screen is expanded 1.5 times.

(Continued on next page)

1-4

Vertical fan mode

A vertical section of underwater conditions (half-circle area) appears on the entire screen.

Vertical fan mode + E/S or sonar

A vertical section of underwater conditions (half-circle area) appears on the upper 2/3 and echo sounder or sonar picture on the lower

1/3. To select the picture to display in the lower 1/3, see DUAL MODE or page 6-9.

(Echo sounder required to display echo sounder picture).

3D display (front perspective view)

The vertical contour line appears historically (time or distance). Only the latest echo is painted, like

the vertical mode presentation. This mode may be turned on in the SYSTEM menu.

3D display (slant perspective view)

Display contents are same as front perspective mode except the per- spective is different. This mode may be turned on in the SYSTEM menu.

Note: Asterisk-marked modes require external signal interface and external E/S interface. Furthermore the E/S key on the sub panel 2 must be turned on.

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1.6 Background Color

The background color is available in deep blue, blue or black, with the HUE key.

1.7 Degaussing the Screen

The screen is automatically degaussed at the interval selected on the SYSTEM SETTING menu. However, when the picture or picture color appears to be distorted, manually degauss the screen with the DEGAUSS key.

1-6

SONAR MODE

2.1 Typical Operating Procedure

MENU

MENU

Figure 2-1 Main panel and sub panel controls

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2.2 Selecting Range

The RANGE control selects the detection (display) range. Se- lect the range according to either the fish species being searched or the depth desired. Normally it is set so that the bottom is traced at the lower part of the screen (like an echo sounder).

SEA SURFACE

Range indicated

on the screen.

BOTTOM

Figure 2-2 Range selection

Table 2-1 Transducer frequency and range

Note: Unit of range measurement may be changed through the SYSTEM menu. For details see page 6-1.

2-2

2.3 Selecting Sector, Sector Stepping

Sector width

Sector means the width of the transducer training. The SEC- TOR control selects the training (display) area among six posi- tions. In the full circle mode (360??) the direction of training is clockwise only.

Table 2-2 Transducer training sector

Figure 2-3 Sector selection

Sector step

The FAST SCAN key in the sub panel 2 selects sector step in 45?? or 6??.

2-3

2.4 Setting the Tilt Angle

The tilt angle shows the direction to which the sound wave is emitted. When the sound wave is emitted horizontally, the tilt angle is said to be 0?? and when emitted vertically, 90??.

To set a tilt angle, operate the TILT control. Watch the tilt angle indication at the top right corner of the screen. The tilt angle can be set in one-degree steps from -5?? (upward) to 60?? (down- ward).

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

Bottom echo and tilt angle

Case 1: Tilt angle 30?? to 40??

This tilt angle will display the entire bottom since it is captured by the full width of the beam.

Case 2: Tilt angle 10?? to 20??

This tilt angle will only display half the bottom since it is only captured by the lower half of the beam.

Case 3: Tilt angle 0?? to 5??

This tilt angle may or may not capture the bottom since the returning echo is weak.

How to discriminate fish echoes from the bottom

The figure at the top of the next page illustrates how two fish schools a and b are displayed on the screen using three dif- ferent tilt angles.

Case 1: Tilt angle 30?? to 40??. Fish school is obscured by the bottom.

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

Case 3: Tilt angle 0?? to 5??. Fish school is located close to the bottom.

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Figure 2-4 Fish echo and tilt angle

Points to consider

???Normally, a vertically distributed fish school is a better sonar target than the bottom, because it reflects the transmitted pulse back toward the transducer.

???In case 3, both fish schools aand bare presented. Gener- ally speaking, however, midwater fish schools tend to be larger than bottom fish schools and they are often displayed near the bottom on the display.

???It is difficult to detect bottom fish when they are not distrib- uted vertically.

Tilt angle for surface fish

Sound emitted from the sonar transducer forms an oval-shaped beam with a width of approximately 13?? (for 60 kHz transducer) 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??, the cen- ter line is parallel with the sea surface and one half of the emit- ted sound goes upward, toward the sea surface.

This causes one half of the emitted sound to be reflected to- ward the transducer and displayed on the screen as sea sur- face 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 be- come negligible.

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However if the sea is not calm enough, they will become domi- nant and interfere with observation of wanted echoes. To mini- mize these sea surface reflections and to search surface fish schools effectively, the tilt angle is usually set between 5?? and 6?? so the upper portion of the beam becomes almost parallel with the sea surface. When the sea is rough, it is often set to a little larger angle.

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.

(m) Depth

200(400)

Figure 2-6 Tilt angle and beam coverage

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2.5 Adjusting Gain

Most equipment malfunctioning claims result from improper setting of switches and controls. For example, fish, fish habitat or outcrop can not be readily detected by merely increasing the gain. Initially set the gain between 3 and 5 with the GAIN control. Then, fine tune depending on the fishing ground, fre- quency used, etc.

Turn on "IR" in SONAR menu.

Figure 2-7 How to set the gain

2.6 Rejecting Sonar Interference and Noise

While observing the sonar picture, you may encounter occa- sional or intermittent noise and interference as shown below.

These are mostly caused by onboard electronic equipment, engine, propeller noise, or electrical noise from other sonars being operated nearby.

Figure 2-8 Noise and interference

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Identifying noise source

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

???Operate all onboard equipment one by one while observing the picture.

???Run the boat at various speeds to check if the noise is speed dependent.

If neither of the above affects the picture, turn on ???IR??? in the

SONAR menu or adjust the NL (Noise Limiter) control as be- low.

Rejecting noise with the interference rejector

This control is effective in rejecting random noise and sea sur- face reflections in rough sea conditions. Pull the GAIN control and adjust it to eliminate only noise. Reject the noise with ???IR??? in the SONAR menu. Do not use an unnecessarily high setting since it many also reject small wanted echoes.

Rejecting noise with NL control

Weak, unwanted reflections, colored light blue or green, ap- pear when water is contaminated, or plankton layers or noise exist. These echoes gradually become bluish as the NL control is turned clockwise. Usually a setting from 3 to 4 provides suf- ficient reduction.

Rejecting interference with Tx rate

When other sonars are operating nearby at the same trans- mission interval as that of own ship???s sonar, interference caused by other sonars appears. To reduce the interference, reduce the Tx rate setting on the SONAR menu.

Note: When the sonar is used in shallow water with the range set between 100 m and 200 m and the Tx rate at 10, bottom reflections caused by the transmission which is the last but one appear on near on screen. Reduce the Tx rate to 7 or 8 to reject them.

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2.7 Detecting Fish Schools Aurally

Occasionally you will be preoccupied with other tasks and un- able to concentrate on watching the sonar picture. In such cases it would be a good choice to use the audio function. This func- tion enables you to monitor echoes from fish schools and bot- tom through the external speaker (option), of which the volume can be adjusted with the AUDIO control on the sub panel 1.

After you become accustomed to utilizing the audio function, 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 schools is approaching or going away; the tone becomes higher when the fish is approaching and lower when going away.

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2.8 R/B and Event Markers (trackball operation)

The trackball functions to obtain the data (slant & horizontal range, depth and bearing) from own ship to the specified posi- tion on the screen and, combined with the R/B and EVENT keys, it switches the R/B and event markers on/off. With navi- gation data input, the event marker moves with ship???s move- ment.

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2.9 Selecting Training Sector Quickly

Normally the training sector is selected by the SECTOR con- trol. To the training sector more quickly, however, use the FULL/ HALF key. This key allows switching between full circle and half circle training sector in a single key stroke.

FULL/HALF key

SECTOR

Figure 2-9 How the SECTOR control and FULL/HALF key work

2.10Suppressing Bottom and Sea Surface Reflections in Shallow Fishing Grounds

In shallow fishing grounds, excessive sea surface and bottom reflections often interfere with wanted fish echoes and they can- not be eliminated sufficiently with the aforementioned TVG con- trols. In such cases, try to reduce the output power from C to B or A on the SONAR menu, without turning down the gain. The picture becomes clearer when output power is reduced rather than when the gain is decreased, as illustrated below.

2-11

Figure 2-10 How to reduce bottom and surface reflections by reducing Tx output power

2.11 Suppressing Bottom Tail

As described earlier, fish schools near the bottom are some- times difficult to detect because you have to discriminate fish echoes from the bottom reflections. To discriminate fish echoes near the bottom, select the short Tx pulse length on the SONAR menu to decrease the tail of bottom reflection.

2.12 Displaying Surface Fish Clearly (TVG adjustment)

Echoes from targets (such as the bottom or a fish) return to the transducer in order of the distance to them, and when their in- tensities are compared 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 won???t be able to judge the actual size of the target from the size of echoes displayed on the screen. To overcome this inconve- nience, use the TVG function. It compensates for propagation loss of sound in water: amplification of echoes on short range is suppressed and gradually increased as range increases so that similar targets are displayed in similar intensities irrespective of the ranges to them.

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In the CH-37, the TVG LEVEL and TIME controls compensate for propagation loss. The effective distance is up to 1000 m approximately.

Figure 2-11 How to adjust TVG

The TVG also functions to suppress unwanted echoes and noise which appear in a certain range area on the screen as shown in the figure above.

To adjust the TVG;

1.Set TVG time between 3 and 5 (approx. 130-300 m). This is the standard setting and you can maintain it in most cases.

2.When sea surface reflections or plankton layers disturb the picture, set the TVG level control around 5 to eliminate them.

3.Locate a fish school on a long range setting which is ap- proaching your vessel. Adjust the tilt to keep the fish school in the center of the sonar beam. Check that the fish echo appears in the same color while it approaches. If the color changes suddenly to weaker colors as the fish echo nears, the TVG is improperly set. Adjust the TVG level to correct it. If sea surface reflections and noise remain, try to remove them with the interference rejector (???IR??? on the SONAR menu) and NL control as described on page 2-8.

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2.13 Relocating Fish School for Easy Observation

When a fish school is near the edge of the screen and inconve- nient for observation, use the ?????? expanded sonar mode and adjust the TRAIN control (off-center function) to relocate the fish school close to the screen center.

Fish school

Fish school

Own ship

Figure 2-12 How to relocate fish school

2.14 Finding Fish School Center

When you want to find the center depth of a fish school, change the tilt angle and observe the presentation as follows:

1.Select a narrow sector range (45??) and capture the target echoes.

2.Adjust the tilt angle with the TILT control slowly and ob- serve the change of the presentation color.

3.The echo presented in the strongest color is the center of the fish school.

Figure 2-13 How to find fish school center

2-14

2.15 Sonar Menu Operation

Operating procedure

1.Press the MENU key on the sub panel 2.

2.Select the SONAR menu with the arrow keys on the sub panel 2.

Figure 2-14 Sonar menu

3.Select item and setting with the arrow keys. The selected item is highlighted and the current setting is circumscribed in white.

4.To turn off the menu, press the MENU key again.

Sonar menu description

TX RATE: Selects transmission repetition rate in ten steps. ???1??? is the longest interval; ???10??? the shortest. Set to ???10??? for normal use.

TX PULSE LENGTH: Selects Tx pulselength to ???LONG??? or

???SHORT.??? The pulselength is adjusted automatically according to the range setting in ???LONG??? or ???SHORT??? position. Set to

???LONG??? for normal use.

TX OUTPUT POWER: Adjusts output power; ???A??? is for mini- mum power and ???C,??? maximum. Set to ???C??? for normal use, and use a low power when sea surface reflections or bottom echo obscures fish schools.

2-15

TX EXT SYNC: If two or more echo sounders or sonars are operated simultaneously, mutual interference may result due to asynchronous keying pulse output. To synchronize keying pulse turn TX EXT SYNC on.

IR: Rejects interference. Turn off when no interference exists, otherwise weak echoes may be missed.

STABILIZER: Select ???ON??? when the Motion Sensor MS-100

(option) is connected.

COLOR: Selects 16- or 8-color presentation.

RES COLOR: Sets echo presentation characteristics. LOG enhances weak echoes and is normally used. LINEAR downplays the weak echoes comparing with LOG. It is effec- tive for suppressing the plankton layer. SQUARE enhances the strong echoes comparing with LINEAR, resulting in clear and easy-reading picture.

2.16 E/S Menu

1.Press the MENU key.

2.Select E/S at the top of the screen.

Default settings circumscribed.

Figure 2-15 E/S menu

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2.17 Turning Trackline Plotting On/Off

With navigation data input, the CH-37 can plot ship???s track on the sonar mode display. The track itself can be turned on/off with the TRACK key.

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2.18 Interpreting the Display

This section provides the information necessary for interpret- ing the display.

How the picture is painted

The wide sounding beam is emitted from the soundome at a certain tilt angle (see hatched area in the figure below). The information (target echoes) obtained by this beam is displayed in 45?? sector of the screen. Thus, all directions around the boat are s ounded in 8 times of transmissions.

Note: When the ???FAST SCAN??? is switched off, the equipment operates in a narrow sounding beam. Then, the echoes appear on a 6?? sector in each transmission, so 60 times of transmissions are required to complete full 360?? pic- ture (6?? x 60 = 360??). This means that sounding speed reduces. However, since transmission power is concen- trated into the narrow sounding beam, a superior detec- tion range is obtained. Furthermore, since the bottom contour is painted distinctly, bottom fish detection may become easier.

Freq: 60 kHz

13??

Sounding Beam

RX

16??

13??

When the narrow sounding beam (6-degree step operation) is selected, 60 transmissions are required to complete the full circle detection.

Figure 2-16 How the picture is painted

2-18

Bottom echoes

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

Figure 2-17 Bottom echoes

2-19

Fish schools

A fish school appears as a mass of echoes on the screen. The color of the mass shows the density of fish schools on the so- nar beam. To find distribution and center point of a fish school, try several different tilt angles.

When the tilt angle is shallow, he reflection echo from bottom is weak and the fish echo which appears from bottom

is easy to find.

Figure 2-18 Fish schools

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Sea surface reflections

To reduce sea surface reflections, set the tilt angle to 5?? or higher, so the upper edge of the sonar beam does not hit the sea surface, or adjust TVG. When a narrow tilt angle is used, sea surface reflections cover a large area as illustrated below.

15??

Sea surface reflections

Sea surface

15??

Figure 2-19 Sea surface reflections

Wake

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.

Other ship

Own ship

Own ship???s screw noise

Figure 2-20 Wake appearance on the display

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2-22

Noise and interference

When the fishing ground is crowded with many fishing boats, the sonar is subject to interference from ultrasonic equipment

(echo sounder or sonar) on other boats as well as those on own ship.

For instance, interference from the sonar operated on other boats will show itself on the display as in (A) in the figure be- low. This interference can be suppressed by changing the Tx rate on the SONAR menu. Noise from marine life shows itself on the displays as in (B) in the figure below. This type of noise can be suppressed with ???IR??? in the SONAR menu.

Figure 2-22 Noise and interference

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2.19 Sonar Mode Indications

Normal sonar display

Figure 2-23 Indications on the normal sonar display

2-24

Expanded sonar display

Sector width marker

Own ship marker

Trackball marker

Figure 2-24 Indications on the expanded sonar display

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2.20 Application Example

The figure below shows a typical sonar mode application.

2-26

4Narrow the train area, and track fish school.

tating trackball. FULL EVENT

HALF

DO NOT FORGET TO RETRACT THE SOUNDOME

BEFORE TURNING OFF THE POWER !!

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VERTICAL FAN MODE

3.1 Typical Operating Procedure

MENU

Figure 3-1 Main panel and sub panel controls

3-1

3.2 Selecting Range

The RANGE control selects the detection (display) range. Se- lect the range according to either the fish species being searched or the depth desired. Normally it is set so that the bottom is traced at the lower part of the screen (like an echo sounder).

60

Note: The unit of range measurement can be changed through the SYSTEM menu. For details see page 6-1.

Figure 3-2 How to select range

V:H RANGE key

The V:H RANGE key changes the horizontal range scale in two steps. See the figures below.

Figure 3-3 How the V:H RANGE key works

3-2

3.3 Selecting Bearing for the Vertical Fan

The TRAIN control determines the bearing of the vertical fan beam. To which bearing the beam positions is known by the train indicator mark.

TRAIN

The training of the fan beam depends on the status of the AUTO

TRAIN key in the sub panel 2.

AUTO TRAIN

3-3

3.4 Selecting the Display Sector

Sector center, width

The SECTOR and the TILT controls determine the display area

(sector width) and the display center (sector center) respec- tively.

180??

Sector center

Sector center

Figure 3-4 Selecting the display sector

Sector step

The FAST SCAN key in the sub panel 2 selects sector step in

6?? or 3??.

3-4

3.5 Automatic Shifting of Own Ship Position

Own ship position on the screen is shifted automatically either rightward or leftward according to the direction of the sector center and the display sector width.

The figure below shows the own ship position has been shifted rightward on the screen to provide the wider view at port side.

Display sector

Sector center

Figure 3-5 Automatic shift function

3.6 Rejecting Sonar Interference and Noise

While observing the picture, you may encounter occasional or intermittent noise and interference as shown below. This is mostly caused by onboard electronic equipment, engine, pro- peller noise, or electrical noise from other sonars being oper- ated nearby. Turn on the interference rejector (IR) in the SONAR menu to reduce or eliminate the interference.

Figure 3-6 Interference and noise

3-5

3.7Horizontal, Vertical and Event Markers (trackball operation)

The trackball functions to obtain the data (horizontal range and depth) from own ship to the specified position on the screen and, combined with the R/B and EVENT keys, switches the Horizontal, Vertical and Event markers on/off.

Distance to the intersection of the markers.

1)Position the trackball marker on the desired location.

2)Press the R/B key. The horizontal and vertical markers appear and the distance to the intersection of the mark- ers is indicated at the bottom left-hand side of the screen.

3)To erase the marker, place the marker outside the echo display area and press the R/B key.

*Requires navigation data.

(Continued on next page)

3-6

1)Position the trackball marker on the desired location.

2)Read the trackball data displayed at the upper left corner of the screen.

3.8Applying Proper TVG

The TVG function is the same as the one explained in the so- nar mode. For best results, set both TVG level and time a little lower than the ones in the sonar mode. The setting is mode on the BOTTOM/3D menu screen and the usual setting for both time and level is 3.

Figure 3-7 Bottom/3D menu screen

TVG level rejects surface noise, which may mask shallow tar- gets and TVG time adjusts the effective depth.

Figure 3-8 Examples of proper and improper TVG

3-7

3.9 Bottom/3D Menu Operation

Basic procedure

1.Press the MENU key on the sub panel 2.

2.Select BOTTOM/3D with the arrow keys in the sub panel 2.

3.Select item and setting with the arrow keys. The selected item is highlighted and the current setting is circumscribed in white.

4.To return to the BOTTOM/3D menu, press the menu key again.

Figure 3-9 Bottom/3D menu

Bottom/3D menu description

TVG (Level): Controls the receiver sensitivity in short to me- dium ranges to eliminate surface noise, which may mask shal- low targets.

TVG (Time): Determines the TVG effective depth.

BEAM WIDTH: Sets the vertical beam width. Select narrow for general use. The wide beam width is useful for searching a wide area vertically but fish detection range is shortened since the transmitted power attenuates.

AUTO TRAIN SECTOR: Sets the train sector; 90?? , 180?? , or 360?? . Use a wide sector to conduct a general search, narrow- ing it once a fish school is detected.

VERT. ECHO OVERLAY: Turns the E/S combination display on/off. (Requires external E/S.)

3-8

3D VIEW SCALE: Determines the depth item, time or distance for 3D display mode. (Requires optional equipment.)

TIME SCALE or DISTANCE SCALE: Selects z-axis scale of 3D picture.

3.10 Interpreting the Display

This section provides the information necessary for interpret- ing the display.

How the picture is painted

The sounding beam is emitted and the information (target ech- oes) obtained by the beam appears in the corresponding sec- tor as it appears on the sonar mode. The difference is that the training is performed only in vertical direction. It forms a sound- ing area of a half-circle (like a slice of watermelon) to observe a vertical section of underwater conditions.

The bearing of the vertical sounding beam can be selected manually or automatically.

Figure 3-10 How the vertical fan picture is painted

3-9

Port-starboard picture (bottom)

You can see fish echoes at the center-right of the CRT. The bottom is displayed wider as the distance from the ship???s posi- tion increases. Therefore, it may be difficult to discriminate bot- tom fish.

Own ship

Fish school

Bottom

Figure 3-11 Port-starboard picture

When ship passes over fish schools

The sounding beam is directed fore-aft and the display is off- centered* to present a wider view of the area forward of the ship. You can clearly see fish schools approaching from the bow of the ship.

*: Automatically shifted according to the operation control set- tings.

Fish school

Figure 3-12 Picture appearance when passing over fish schools

3-10

Display of net hauling

This is an example of net hauling display. The location of the net is indicated clearly. (Ship is stopped.)

Figure 3-13 Net hauling and sonar picture

False echo

In a shallow water (less than 100 m) detection, unwanted ech- oes shown in the figure may appear. This phenomenon is caused by the false echo from the previous transmission. Re- ducing the Tx rate on the BOTTOM/3D menu may lessen this effect.

Range

Figure 3-14 False echoes

TIP! Training indicator and screen display.

??Shows starting position of the sounding beam.

3-11

3.11 Vertical Fan Mode Indications

3-12

3.12How to Use the Vertical Fan Mode

[1]TRAWLER (Surface/Mid-water/Bottom)

the fish school near the bow of the ship, or inspect the bot- tom contour.

Fish

Shoal schools

2 After detecting a fish school, steer the boat toward that direction, turning off the "AUTO TRAIN" to observe that direction.

Bow

Steered angle

3 When approaching the fish school, change the beam direc- tion to port-starboard by the TRAIN control and maneuver the boat so that the fish are led into the trawl net.

4 To observe the hauling of the net, turn the sounding beam to the fore-aft direction.

Net

Figure 3-16 Vertical fan mode usage in trawling

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[2] PURSE SEINER

2 While approaching, face the sounding beam toward the fish schools and confirm their distribution. The display shown below is off-centered* to obtain a wider view of the starboard side.

Fish school

*Automatically shifted.

3 Shoot the net, and then observe the location of the fish and the status of the net.

Fish

school

Net

Figure 3-17 Vertical fan mode usage on purse seiner

3-14

3D MODE

The 3D mode shows vertical echoes (real time echoes) and a frontal or oblique image of the bottom just passed, like a graphic track plotter. This mode is useful for locating a wreck, a shoal or a fishing reef. Vertical echoes can be turned on/off through the BOTTOM/3D menu.

4.1 Selecting a 3D Display

Either of two displays may be selected with the MODE control: the frontal image at ?????? position, or the oblique image at ??????. Example displays of both images are shown below.

Vertical echoes (real-time echoes)

Figure 4-1 Frontal image

4-1

Oblique image

The oblique image is the equivalent of the frontal image ro- tated by 45?? counterclockwise.

Own position

Sectional view

Figure 4-2 Oblique image

4.2 Turning Vertical Echoes On/Off

Vertical echoes, namely, real time echoes, can be turned on or off on the VERT. ECHO OVERLAY field of the BOTTOM/3D menu, which you can display by pressing the MENU key on the sub panel 2.

Figure 4-3 Bottom/3D menu

4-2

4.3 Changing 3D View Scale Mode and Scale Selection

The depth (z-axis) of the graph is displayed in either ???TIMe??? or ???DISTance??? scale mode. The depth can be set to 500 or 1000 meters in the distance scale mode, or 1/1, 1/2 or 1/4 in the time scale mode. The fraction means graph update/number of trans- mission. ???1/4,??? for example, means the graph is updated every four transmissions.

These selections are made on the 3D VIEW SCALE and TIME

SCALE (or DISTANCE SCALE) lines of the BOTTOM/3D menu.

The time mode should be selected when speed data is not being fed to the unit from navaids or speed log.

Figure 4-4 Depth dimension in frontal and oblique images

4.4 Other Operations

The following operations are the same as those in the Vertical

Fan mode.

???Range Selection

???Rejecting Sonar Interference and Noise

???Horizontal, Vertical and Event markers

???TVG Adjustment

???Beam Width Selection

The selection of the bearing of the vertical fan beam and auto train function are disabled, as the bearing of the vertical fan beam is automatically selected to 90?? in this mode.

4-3

CUSTOM MODE KEYS (??, ???, ??)

5.1 About the Custom Mode Keys

Like the redial feature on a telephone, the custom mode keys record control settings and play them back in a single key stroke.

This feature is useful when you need to quickly set up the so- nar according to fishing ground or fish species being searched. You can program three sets of settings for the MODE, RANGE, SECTOR, TRAIN and TILT controls.

5.2Customizing the Keys

1.Tune the sonar as you normally would.

2.Press the ENTER key to display the CUSTOM MODE menu.

3.Press one of ??, ??? or ?? key (contents shown in second column from the left in figure below).

[CUSTOM MODE menu]

4. Repeat step (2) for remaining custom mode keys.

Note: Custom mode key labels are provided on page AP-1. Cut them out and insert them in the label cases on the front panel. See the illustration on the next page for how to insert them.

5-1

5.3Custom Mode Operation

1.Press desired custom mode key ??, ??? or ??.

2.To escape from the custom mode settings, adjust any con- trols.

[Example]

CH-37

5-2

MENU SETTINGS

6.1System Setting Menu

1.Turn on the power while pressing the MENU key. Release the key when you hear a beep. The SYSTEM menu ap- pears.

EXIT : PRESS MENU KEY

Default settings circumscribed.

Figure 6-1 SYSTEM SETTING menu

2.Select SYSTEM SETTING and press the MENU key.

3.Select items with up and down arrow keys; options with left and right arrow keys.

4.Press the MENU key to return to the system menu.

Note: Be sure to return to the system menu before turning off the power, to properly register settings.

5.To return to normal operation, reset the power.

See the next page for SYSTEM SETTING menu description.

6-1

6.2 Screen Adjustment

Screen size and position can be adjusted as follows:

1.Turn on the power while pressing the MENU key to display the SYSTEM menu.

2.Select SCREEN ADJUSTMENT.

3.Press the MENU key.

6-2

6.3 System Menu

Press the MENU key while turning on the power. The SYSTEM menu appears.

** SYSTEM MENU **

SYSTEM SETTING

RANGE - SONAR MODE

RANGE - VERTICAL FAN MODE

RANGE/SHIFT - E/S

COLOR

LANGUAGE

DISPLAY TEST1 - ROM/RAM/KEY

TRAIN/TILT TEST

SCREEN ADJUSTMENT

TEST PATTERN

DISPLAY TEST2 - OPERATION

DEFAULT

EXIT: TURN OFF THE UNIT

Figure 6-3 System menu

Range - sonar mode menu

1.Select RANGE-SONAR MODE from the SYSTEM menu.

2.Press the MENU key.

** RANGE - SONAR MODE **

EXIT : PRESS MENU KEY

Figure 6-4 Range - sonar mode menu

6-4

3.Select range.

4.Set range.

5.To return to the SYSTEM menu, press the MENU key.

6.To quit, reset the power.

Range - vertical fan mode

1.Select RANGE-VERTICAL FAN MODE from the SYSTEM menu.

2.Press the MENU key.

EXIT : PRESS MENU KEY

Figure 6-5 Range - vertical fan mode menu

3.Select range.

4.Set range.

5.To return to the SYSTEM menu, press the MENU key.

6.To quit, reset the power.

6-5

Range/shift - e/s

1.Select RANGE/SHIFT - E/S from the SYSTEM menu.

2.Press the MENU key.

** RANGE/SHIFT - E/S **

FACTORY SETTING : NO YES

EXIT : PRESS MENU KEY

Figure 6-6 Range/shift - e/s screen

3.Select range (shift).

4.Set range (shift).

5.To return to the SYSTEM menu, press the MENU key.

6.To quit, reset the power.

6-6

Color setting

The color setting screen allows you to adjust display colors.

1.Select COLOR from the SYSTEM menu.

2.Press the MENU key.

Figure 6-7 Color setting screen

3.Select color.

4.Set color.

5.To return to the SYSTEM menu, press the MENU key.

6.To quit, reset the power.

6-7

Factory setting menu (restoring default settings)

1.Select DEFAULT from the SYSTEM menu.

2.Press the MENU key.

** DEFAULT **

ARE YOU SURE? : NO YES

EXIT : PRESS MENU KEY

NOTE! ALL SETTINGS INCLUDED IN SYSTEM MENU

WILL BE CHANGED TO FACTORY SETTING

Figure 6-8 Default screen

3.Select YES and press the MENU key to restore default set- tings.

4.To return to the SYSTEM menu, press the MENU key.

5.To quit, reset the power.

Display test - operation

1.Select DISPLAY TEST - OPERATION from the SYSTEM menu.

2.Press the MENU key. TEST appears on the screen while the display unit is being tested.

3.To quit, reset the power.

6-8

6.4 Dual Menu

Press the [MENU] and choose DUAL to open DUAL menu.

Description of DUAL menu

DUAL MODE: Choose the display to show on the lower 1/3 of

the combination display. E/S: Echosounder, BOTTOM: Verti-

cal Fan, SONAR: Sonar picture from the CH-37 is displayed like an echosounder picture. The default setting is E/S.

NET MOUTH SHIFT: Set the left/right position of the net mouth mark. The setting range is -999 to +999 (m) and the default setting is 0 m. (Setting range and default setting change with unit of measurement.)

NET MOUTH WIDTH: Set the left/right width of the net mouth mark. The setting range is 1-999 (m) and the default setting is

100 m. (Setting range and default setting change with unit of measurement.)

NET MOUTH HEIGHT: Set the up/down width of the net mouth mark. The setting range is 1-999 (m) and the default setting is 30 m. (Setting range and default setting change with unit of measurement.)

NET DEPTH: Choose the net mouth mark depth setting method.

The default setting is AUTO. AUTO: Use the IEC/NMEA depth

data sentence DBS. MANUAL: Set the depth with the [??? ] or [??? ] key on the sub panel.

HOR SCAN RATE: Set the horizontal scan rate for the combi- nation mode; that is, the number of horizontal scans produced per line drawn in the combination display. The setting range is

1-10 and the default setting is 1.

VER SCAN RATE: Set the vertical scan rate for the combina- tion mode. that is, the number of vertical scans produced per line drawn in the combination display. The setting range is 1-

10 and the default setting is 1.

6-9

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6-10

MAINTENANCE & TROUBLESHOOTING

Good performance depends on regular maintenance. Follow- ing the recommended procedures in this chapter will keep the equipment operating in top condition for years to come.

WARNING

ELECTRICAL SHOCK HAZARD

Do not open the equipment.

Only qualified personnel should work inside the equipment.

7.1Maintenance of Display Unit

???Handle with care. Corrosion may start even from a scratch.

???Allow space around the unit for ventilation.

???Keep it away from equipment with magnets (such as a speaker, large capacity transformer) and also magnetic-sen- sitive units such as gyrocompass or cassette tape.

???Clean the filter and screen with a wet or dry soft cloth. Do not use commercial cleaners to clean the display unit ??? they can remove paint and markings.

???Cover the display unit when it is not in use.

???Degauss the display with the DEGAUSS key when picture color is abnormal.

7.2Maintenance of Transceiver Unit

Keep the unit clean, especially the cable entrance. Wipe off dust or oil with a cloth dampened in water-diluted mild deter- gent.

7-1

7.3 Maintenance of Hull Unit

Lubrication

Grease the raise/lower screw shaft once a year. Also, grease the raise/lower main shaft (upper part of the grease cotton re- tainer) twice a year. These parts can accessed by removing the raise/lower drive assembly cover.

Manual raise/lower of transducer with hand crank

Ship???s mains should be supplied to the hull unit to do this check. Also be sure to press and hold down the brake-off switch while manually raising/lowering the transducer. Failure to press the switch may damage the raise/lower motor.

1.Turn off the breaker on the hull unit.

2.Remove the brake-off switch cover.

3.Set 19 mm socket wrench and turn it while pressing the brake-off switch.

4.Check that the transducer can be raised/lowered smoothly with a constant force from the upper to the lower limit posi- tions. If not, centers of the main body flange and the retrac- tion tank are not aligned. Adjust the hull unit mounting position.

Brake-Off

Lower

Breaker

Figure 7-1 Using the hand crank

7-2

7.4 Display Unit Test

This test checks the ROM, RAM and keyboard for proper op- eration.

1.Turn on the power while pressing and holding down the MENU key. Release the MENU key when you hear a beep. The SYSTEM menu appears as shown below.

** SYSTEM MENU **

SYSTEM SETTING

RANGE - SONAR MODE

RANGE - VERTICAL FAN MODE

RANGE/SHIFT - E/S

COLOR

LANGUAGE

DISPLAY TEST1 - ROM/RAM/KEY

TRAIN/TILT TEST

SCREEN ADJUSTMENT

TEST PATTERN

DISPLAY TEST2 - OPERATION

DEFAULT

EXIT: TURN OFF THE UNIT

Figure 7-2 System menu

2.Select DISPLAY TEST1 - ROM/RAM/ KEY with the arrow keys on the sub panel 2.

3.Press the MENU key to start the test. The program no., Tx frequency, and pitch and roll angles are displayed, and the ROM, RAM, SI/O are checked.

4.Operate each key and control on the main panel, sub panel and remote control box. A pressed key???s on-screen indica- tion changes to 1 when the key is pressed; 0 when it is released.

5.To return to the SYSTEM menu, press the MENU key again.

6.To quit, reset the power.

7-3

7-4

7.5 Train/Tilt Test

This test checks the transducer training and tilting functions for proper operation.

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

2.Select TRAIN/TILT TEST with the arrow keys in the sub panel 2.

3.Press the MENU key to start the test.

4.To return to the SYSTEM menu, press the MENU key again.

5.To quit, reset the power.

Figure 7-4 Train/tilt test results

7-5

7.6 Test Pattern

This test checks display position and colors.

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

2.Select TEST PATTERN with the arrow keys in the sub panel 2.

3.Press the MENU key to start the test.

Position check

Figure 7-5 Test pattern

4.To return to the SYSTEM menu, press the MENU key again.

5.To quit, reset the power.

7.7Error Messages

Raise/lower error message

If the power is not applied to the hull unit, the following mes- sage appears on the screen and the buzzer sounds.

HULL UNIT

POWER OFF

(CHECK BREAKER AND FUSE)

PRESS R/B KEY TO SILENCE ALARM

Figure 7-6 Raise/lower error message

If this occurs, turn the power off and check the breaker and fuse as the screen suggests.

7-6

Transceiver unit error message

If the power is not supplied to the transceiver unit, the following message appears on the screen and the buzzer sounds.

TRANSCEIVER

UNIT

POWER OFF

(CHECK FUSE ON TRANSCEIVER UNIT)

PRESS R/B KEY TO SILENCE ALARM

Figure 7-7 Transceiver unit error message

If this occurs, turn the power off and check the fuse as the screen suggests.

Speed warning

Because the transducer may be damaged if it is kept lowered when ship???s speed exceeds 15 knots (based on the speed rela- tive to ground fed from nav sensor), the following message appears and the buzzer sounds.

Press the R/B key to silence the buzzer and return to the nor- mal sonar picture. Raises the transducer.

TRANSDUCER

REMAINS

LOWERED

(REDUCE SHIP???S SPEED AND PRESS ??? KEY)

PRESS R/B KEY TO SILENCE ALARM

Figure 7-8 Speed warning

7-7

Train error message

If something is wrong with the train control circuit, the following message appears and the unit stops operating. Turn the PWR switch off and contact your service agent at your earliest con- venience.

TRAIN NG

Figure 7-9 Train error message

Tilt error message

If something is wrong with the tilt control circuit, the following message appears and the unit stops operating. Turn the PWR switch off and contact your service agent at your earliest con- venience.

TILT NG

Figure 7-10 Tilt error message

7-8

7.8 Troubleshooting Table

The table below provides common symptoms of equipment troubles and the means to rectify them. If normal operation cannot be restored, do not check inside the system. Any repair work is best left to a qualified technician.

TVG effect is excessive.

Excessive TVG results in elimination of useful echoes.

Increase the brightness.

0 10

BRILL

(Continued on next page)

7-9

7-10

CUSTOM MODE KEY LABELS

AP-1

SPECIFICATIONS OF COLOR SECTOR SCANNING SONAR

**: Measured at fast train mode of 60 kHz (reference only).

Display sector width is selected among 45??, 90??, 135??, 180??, 225?? and 360?? by horizontal, 36??, 60??, 96??, 120??, 156?? and 180?? by vertical.

SP - 1

SP - 2

6. ENVIRONMENTAL CONDITION

SP - 3

INDEX

Index-1

Range preset e/s mode 6-4 sonar mode 6-4

vertical fan mode 6-5

S

Screen adjustment 6-2 SECTOR control

sonar mode 2-3 vertical fan mode 3-4

Sonar menu 2-15 Speed warning 7-7

Sub panel description 1-2 System configuration vi System menu 6-4 System setting menu 6-1

T

Test pattern 7-6 Tilt angle 2-4 TILT control

sonar mode 2-4, 2-14 vertical fan mode 3-4

Tilt error message 7-6 TRACK key 2-17 TRAIN control

sonar mode 2-15 vertical fan mode 3-3

Train error message 7-8 Train/tilt test 7-5 Transceiver unit care 7-1

Transceiver unit error message 7-7 TRANSDUCER switches 1-3 Troubleshooting

display unit test 7-3 error messages 7-6 test pattern 7-6 train/tilt test 7-5

troubleshooting table 7-9 TVG control

sonar mode 2-13

vertical fan mode 3-7, 3-8 Tx rate 2-15

Tx rate adjustment 2-8

V

V:H RANGE key 3-2

Vertical marker 3-6

Index-2