Koden CVS-128 Operation Manual

CVS-128

CVS-128.OM.E 0093112802-01

COLOR ECHO SOUNDER

Declaration of Conformity

(As referred to in Annex IV 2. of Directive 2004/108/EC)

Declares under his sole responsibility that the produced Echo Sounder manufactured by

Koden Electronics Co., Ltd.

5278 Uenohara

Uenohara-Shi

,

Yamanashi-Ken

409-0112, Japan

Telephone [phone] Telefax [phone]

Identified by the type number CVS-128 to which this declaration refers conforms to the

relevant essential requirements of Directive 2004/108/EC and is in conformity with the EMC
requirements of EU harmonised standard

EN60945 2004

Authorised representative in Europe

Heinz Hoghoff
Koden Elektronik GmbH.
Am Gewerbepark 15
D-64823, Gross–Umstadt
Germany.
Phone [phone]
Telefax+49 6078 73824

Signed
Heinz Hoghoff,

Dated 15 April 2009

N.B. As this product is for Maritime use compliance with Directive 72/23/EEC is not required.

CVS-128 Revision History

0093112802-01 i

CVS-128 Operation Manual

Doc No. 0093112802

Document Revision History

No. Doc. No-Rev. No. Date Revised

(Y/M/D)

Revised Content

0 0093112802-00 2009/05/27 First edition
1 0093112802-01 2009/07/09 Chapter 1
2
3
4
5
6
7
8
9

10

Document No. Revised Version Norm

When part of the document needs to be revised, the document has advanced revision number.
The document No. is indicated at the lower right side on the cover and at the left or right side of the
footer region of each page.

© 2009 Koden Electronics Co., Ltd. All rights reserved.
No part of this publication may be reproduced, transmitted, translated in any from by any means
without the written permission of Koden Electronics Co., Ltd. The technical descriptions contained in
this publication are subject to change without notice. Koden assumes no responsibility for any errors,
incidentals or consequential damages caused by misinterpretation of the descriptions contained in this
publication.

Important Notice CVS-128

ii 0093112802-01

Important Notice

• The re-use and transcription of Operation Manual (hereafter calle d this manual) needs permission
of our company. Our company prohibits the un-autho r ized re-use and transcription.

• If this manual is lost or damaged, consult our dealer or our company.

• The specification of our products and the content in the Operation Manual are subject to changed

without notice.

• In the explanation of this manual, the content displayed on the menu of product may be different.
The keys and menus in the illustration may differ in physical font and shape. And some parts may
be omitted.

• Our company is not liable for damage and trouble arisen from misunderstanding the content
described in this manual.

• Our company is not liable for earthquake, lightning, fire for which our company is not re sponsible,
action by third party, other accident, customer’s unintended error/abuse and damage caused by the
use under other abnormal condition.

• Our company is not liable for damage of accompaniment (change/loss of memorized content, loss
of business profit, stop of business) arisen from use or failure of our product.

• If the stored data is changed or lost, irrespective of any cause of trouble and damage, our company
is not liable for it.

• Our company is not liable for any damage arisen from malfunction caused by combination of
software and connected equipment we do not involve.

CVS-128 For Your Safe Operation

0093112802-01 iii

For Your Safe Operation

Pictorial used in this Instruction Manual

This Operation Manual uses the following pictorials. Understand the meaning of each pictorial and
implement the maintenance and inspection.

Symbol Meaning

Mark for warning

This symbol denotes that there is a risk of death or serious injury when not
dealing with it correctly.

Mark for danger high voltage

This symbol denotes that there is a risk of death or serious injury caused by
electric shock when not dealing with it correctly.

Mark for caution

This symbol denotes that there is a risk of slight injury or damage of device
when not dealing with it correctly.

Mark for prohibition

This symbol denotes prohibition of the specified conduct. Description of the
prohibition is displayed near the mark.

Caution Item on Equipment

Be careful of a high voltage inside.

A high voltage, which may risk your life, is used. This high voltage remains
in the circuit after you have powered off switch. To prevent touching the high
voltage circuit inadvertently, the hard cover is provided to the high voltage
circuit and the high voltage caution label is affixed. Ensure to power off
switch for your safety and discharge the electricity remaining in the capacity
before starting to check. An engineer authorized by our company should
inspect and maintain

Be sure to power off in the boat.

If the power switch is inadvertently powered on during work, you will be
electrified. To prevent such accident from occurring, ensure to power off in
the boat and the power of equipment. Furthermore, it is safer to hang the
caution tag described as [Under Work] near the power switch of equipment.

Be careful of dust

Inhaling dust may cause A respiratory disease. When cleaning the inside of
equipment, be careful not to inhale dust. Wearing a safety mask is
recommended.

For Your Safe Operation CVS-128

iv 0093112802-01

Caution on location of equipment

Do not install the equipment where it is excessively damp and suf f ers from
excessive water drops.

Escaping from static electricity

The static electricity may be generated from the carpet on the floor in the
cabin or clothes made of synthetic fiber. The static electricity may destroy
the electronic parts on the circuit board. Handle the circuit bo ard, taking the
measure of static electricity free.

Install the transducer at the location where it is not affected by bubble and
noise The bubble and noise seriously degrade the performance o f this unit.

Caution Item on Handling

Do not disassemble or modify. It may leads to trouble, fire, smoking or
electric shock. In case of trouble, contact our dealer or our company.

In case of smoke or fire, boat power off and the power of this unit. It may
cause fire, electric shock or damage.

Be cautious of remaining high voltage.
A high voltage may remain in the capacitor for several minutes after you
have powered off. Before inspecting inside, wait at least 5 minutes after
powering off or discharge the remaining electricity in a n appropriate manner.
Then, start the work.

The information displayed in this unit is not provided directly for your
navigation. For your navigation, be sure to see the specified material.

Use the specified fuse. If un-specified fuse is used, it may cause a fire,
smoke or damage.

Whenever transmitting, be sure to submerge the transducer in water first. If
transmitted without submerging the transducer, it may be damaged.

CVS-128 Contents

0093112802-01 v

Contents

Document Revision History....................ⅰ

Important Notice.....................................ⅱ

For Your Safe Operation ........................ⅲ

Contents.................................................ⅴ

Introduction...............................................ⅷ

System Configuration ...............................ⅸ

Configuration of Equipment......................ⅹ

Chapter 1 Basic Operation ......................1-1

1.1 How to use the key .................... 1-1

How to remove the hard cover...1-2
When removing the CVS-128

Display unit ................................1-2

The clean of CVS-128

Display unit ................................1-2

1.2 Power On/Off.............................1-3

Power on....................................1-3

Power off....................................1-3

Alarm of Power Voltage.............1-3

1.3 LCD Brilliance Adjustment......... 1-4

Adjustment of LCD Brilliance..... 1-4

Brightness Adjustment of Panel

Brilliance ....................................1-4

1.4 Switch-over of Display mode.....1-4

Normal Image (Low frequency,

High frequency)..........................1-4

Dual frequency...........................1-5

Zoom (Low frequency, High

frequency).................................. 1-5

Navigation Menu (NAV1, NAV2) 1-7

1.5 Switch-over of Range ................1-8

Setting the range switching to auto

range..........................................1-8

Setting the range switching to

Manual range............................. 1-8

1.6 Gain Adjustment.........................1-8

Basic Operation of Gain............. 1-8

Selecting the auto gain.............. 1-9

Adjusting the gain by auto .........1-9

Selecting the manual gain .........1-9

Manual adjustment of the gain...1-9

1.7 Use of 【EVENT】 key ..........1-10

Selecting the event .................. 1-10

Preseting the destination......... 1-10

Store the image........................ 1-11

Fishing hot spot........................1-12

1.8 Use of 【F1】/【F2】 key ..... 1-12

Selecting the

【F1】/【F2】 key.................. 1-12

Preset of【F1】/【F2】key..... 1-13

1.9 Operation of VRM....................1-13

1.10 Display of fish information........1-14

Display the fish symbol / stop the

display of fish symbol............... 1-14

Selecting the symbol info.........1-14

Points to note in use of fish

symbol......................................1-15

Chapter 2 How to use the Menu .............2-1

2.1 How to operate the menu ..........2-1

Display the menu / Stop the

display of menu..........................2-1

Menu Operation.........................2-1

2.2 Changing of Image S peed......... 2-2

2.3 Rejection of Interference............2-2

Interference Rejection................ 2-2

2.4 Color Rejection of Weak Echo... 2-3

Color Rejection ..........................2-3

2.5 Rejection of Noise...................... 2-3

Noise Rejection..........................2-3

2.6 Setting of Shift............................2-3

Setting of Manual Shift............... 2-3

Setting of Auto Shift...................2-4

Contents CVS-128

vi 0093112802-01

2.7 Setting of Zoom Range..............2-4

2.8 Setting of Zoom Start .................2-4

2.9 Setting of Background Color......2-5

2.10 Setting of White Line..................2-5

2.11 Preset of Range.........................2-5

2.12 Setting of Alarm..........................2-6

Stopping the alarm sound..........2-6

Setting the alarm........................2-7

Release the alarm......................2-7

Confirm the alarm state..............2-7

2.13 Preset/ WPT edit/ WPT delete of

Destination.................................2-8

NAV Start....................................2-8

Cancel the NAV..........................2-8

Edit the destination.....................2-8

Delete the destination ................2-9

Recall the stored image and

preset it as a destination............2-9

2.14 Store/Recall/ Deletion of Image 2-10

Store the image........................2-10

Recall the stored image ...........2-10

Delete the stored image...........2-11

Add the comment to the stored

image........................................2-11

2.15 Selection of Zoom ....................2-12

2.16 Selection of NAV Display .........2-12

Type of NAV Display ................2-12

Selection of NAV Menu............2-13

2.17 Explanation of Sonar................2-13

Switch-over of Sona-tone.........2-13

Connection of External

Speaker....................................2-13

2.18 Explanation of Menu Item ........2-14

Inner-hull ..................................2-14

TVG..........................................2-14

Change the TX power..............2-14

Display the A scope / Stop the

display of A scope ....................2-15

Change the display color of echo

sounder image .........................2-15

Change the depth value...........2-15

Display the water temp graph /
Stop the display of water temp

graph........................................2-15

Display Width...........................2-15

Setting of the background color of

NAV display..............................2-16

Setting of the echo sounder

display at NAV display..............2-16

Image Swap.............................2-16

Display the Operation guide /
Stop the display of Operation

guide.........................................2-16

Chapter 3 How to use the menu2............3-1

3.1 Display of Menu .........................3-1

Display the menu .......................3-1

Return to the normal menu........3-1

3.2 Setting of External Input/Output.3-1

Buzzer Setting............................3-1

Temp Source ..............................3-1

Speed Source.............................3-1

Baud Rate..................................3-1

NMEA Monitor............................3-2

NMEA Output Data.....................3-2

3.3 Setting of Correct Item...............3-2

Draft Set.....................................3-2

Sonic Speed...............................3-2

Water Temp................................3-2

Boat Speed.................................3-2

Beam width High / Beam width

Low.............................................3-2

3.4 Setting of Basic Set Item............3-3

Language...................................3-3

Range & Speed Unit...................3-3

Depth Unit..................................3-3

Temperature Unit........................3-3

CVS-128 Contents

0093112802-01 vii

Local time Offset........................ 3-3

GPS select................................. 3-3

GPS initialize..............................3-3

3.5 Maintenance Menu .................... 3-4

Simulation.................................. 3-4

Slide show..................................3-4

Initialize...................................... 3-4

System Check............................3-4

All WPTs deletes........................3-4

All stored image deletes ............3-4

Chapter 4 Maintenance and Inspection...4-1

4.1 Inspection................................... 4-1

4.2 Cleaning.....................................4-1

CVS-128 Display unit................. 4-1

Transducer.................................4-1

4.3 Fuse Replacement..................... 4-2

4.4 If you suspect a trouble..............4-2

4.5 Diagnostic Test...........................4-3

Diagnose....................................4-3

Confirm the version.................... 4-3

Return to the menu....................4-3

Chapter 5 Installation...............................5-1

5.1 Item of Caution on Installation...5-1
Unpacking the configuration

parts...........................................5-1

Inspection of configuration items

and accessories......................... 5-1

Decision of Installing Location...5-1
Laying and Connection of

Cable.......................................... 5-2

Confirmation after Installation.... 5-2

5.2 Installation of CVS-128

Display unit................................5-3

Desk-top Installation .................. 5-3

Flush-mount Installation............. 5-5

5.3 Installation of Transducer...........5-6

In case of Inner-hull ................... 5-6

In case of through hull................5-7

5.4 Wiring.........................................5-8

Connection of Cable to CVS-128

Display unit ................................5-8

Pin Assignment of Rear

Connector ..................................5-8

Connection of Power Cable....... 5-9

Connection of Transducer........5-10

Connection with external

equipment................................ 5-11

Connection with GPS-20A....... 5-11

Connection with Speed Sensor or
Water Temperature Sensor

(Option).................................... 5-12

Connection of External Speaker
for Sone-Tone

(Prepared by a customer)........ 5-13

Connection of External Monitor
(J7) (Prepared by a customer). 5-13

5.5 Serial Data...............................5-14

Input Data ................................5-14

Output Data..............................5-14

Chapter 6 Table Attached........................ 6-1

6.1 Menu List ...................................6-1

6.2 Specification...............................6-5

6.3 Appearance................................6-6

Introduction CVS-128

viii 0093112802-01

Introduction

The CVS-128 is a Dual frequency (50 kHz/200 kHz) Color LCD display echo sounder.
This unit equipped with digital process displays the circumstance in the water under all conditions,

matching with the high luminance 8.4 inch LCD.
The main features of this unit are as follows:

• With the digital reception process, the compatibility of the high resolution in a shallow depth and the
noise rejection capability in a deep depth are established. The auto mode function provides the best
image.

• The high-performance LCD maintains high visibility under any conditions.

• The unit can be installed in an open bridge and is highly waterproof.

• Sona-Tone (Sonar sound) function is equipped with for catching situations schools of fish and

others by sound.

• Up to 10 images can be stored. If you connect the optional GPS, the fishing hot spot function, that
directs your board to navigate easily to the location desired, is available by marking the event mark
when recalling the stored image.

• With the adoption of a specific filter (AR coat), an image can be seen clearly, refusing sunshine.
The countermeasures against the reflection on the LCD screen and dew are provided.

• The various alarm functions are available. (Bottom, school of fish, water temperature*, board
speed*, arrival*, XTE*, power) (Note: The mark * denotes that the connection of option is
mandatory)

• When flush-mounting, the unit can be easily installed from front side.

• The RGB output for an external monitor is provided as standard equipment. The use of the external

monitor enables you to observe easily the echo sounder screen at a location which is remote f rom a
main unit. (External monitor: Prepared by a customer)

CVS-128 System Configuration

0093112802-01 ix

System Configuration

Connection Diagram

red

Black

Note: To use the water temperature sensor / speed sensor,

The wiring of transducer connector has to be changed.

Water temperature sensor

CVS-128 Display unit

With mounting bracket and hard cover

External power output (For GPS etc)

External speaker (For speaker with amplifier)

NMEA circuit input output
GPS sensor (GPS-20A)

External navigation equipment

,

＋

ー

Connection to the Transducer

Connection to the water

Connection to the speed senso

r

ST-80/90/100

T o T ransducer connector

To POWER connector

Standard configuration
Option

Prepared by a user

(J6 connector）

(Prepared by a user)

To External monitor connector

(J7 connector)

External monitor

CW-576-0.5M

(Prepared by a user)

CW-264Ａ-2M

10.8-31.2VDC

CW-840-0.3M

Rubber mold made Equipped with inner-hull

Transducer TD-500T-3B / 501T-3B (Dual frequency combination type 50 / 200 kHz)
Bronze made Equipped with through-hull

Plastic made Equipped with inner-hull

Legend

external water temperature meter

Temperature

/ speed sensor

Transducer TD-500T-2B (Dual frequency combination type 50 / 200 kHz)

Transducer TD-501C (Dual frequency combination type 50 / 200 kHz)

Configuration of Equipment CVS-128

x 0093112802-01

Configuration of Equipment

Standard Equipment Configuration List

No Name of item Type Remark

Weight/

Length

Quantity

1 Display unit

CVS-128

600 W/1 kW output
with mounting bracket
and knob

3.2 kg 1

2 Hard cover

E57MB11060 250 g 1

3 DC power cable

(Complex cable)

CW-264A-2M

With 12 connector at
one end/ un-treated at
the other end

2 m 1

4 Fuse

F-7161-3A
Cylinder (ø 6.3x32)

Normal fusion type for
main power

2

5 Cap

LTWCAP-DABCFXC1

For transducer cable
connector

1

6 Operation Manual CVS-128.OM.E English 1
7 Quick Reference CVS-128.QR.E English 1

Essential Option

No Name of item Type Remark

Weight/

Length

Quantity

1 Transducer Type of transducer

(Next page )

transducer cable (with
connector at one end)

1

CVS-128 Configuration of Equipment

0093112802-01 xi

Type of transducer

No Specification Frequency Material /

Length of
the cable

Mounting method Beam width

(Right and left x back and

forth)

1

TD-500T-2B

50/200 kHz

600 W

Plastic

9m

Inner-hull
(The inner-hull kit is
needed.)

50kHz

50°x50° ( -6dB)

200kHz

17°x17° ( -6dB)

2

TD-500T-3B

50/200 kHz

600 W

Bronze

9m

Through-hull

50kHz

50°x50° ( -6dB)

200kHz

17°x17° ( -6dB)

3

TD-501C

50/200 kHz

1 kW

Rubber

mold

10m

Inner-hull
(The inner-hull kit is
needed.)

（The CW-840-0.3M

is needed）

50kHz

58°x20° ( -6dB)

200kHz

17°x 6° ( -6dB)

4

TD-501T-3B

50/200 kHz

1 kW

Bronze

9m

Through-hull

50kHz

20°x22° ( -6dB)

200kHz

5°x 5° ( -6dB)

Option List

No Name of Item Specification Remark Weight/Length

ST-80

For transom mounting
Plastic made (with cable)

0.3 kg / 9 m

ST-90

For through-hull mounting
Plastic made (with cable)

0.6 kg / 9 ｍ

1

Water temperature
sensor/speed sensor

ST-100

For through-hull mounting
Bronze made (with cable)

1.2 kg / 9 ｍ

2 GPS sensor

GPS-20A-10M-B

[KODEN]

For GPS measuring
(With power & signal cable)

250 g / 10 m

MFB-04

Plastic made for installing the
transducer TD-500T -2B

1.3 kg

3 Inner-hull kit

MFB-04W

Plastic made for installing the
transducer TD-501C

1.3 kg

4 Cable for transducer CW-840-0.3M

Needed when using the
optional water temperature
sensor / speed sensor.

30 cm

5

Connector for GPS
sensor

LTWBD-06PMMP-LC

Needed when using the
GPS-20A（Type B）sensor.

6

Cable for external
monitor

CW-576-0.5M

Junction cable for connection of
external monitor

0.5 m

CVS-128 Chapter 1 Basic Operation

0093112802-01 1-1

Chapter 1 Basic Operation

1.1 How to use the key

CVS-128 Display unit

In addition, for your convenience when operating keys other than keys in the menu by the [MENU] key,
the menu displayed automatically closes.

No. Key Name Explanation

1 [F1] Recalls directly the item preset.
2 [EVENT]

Notifies the external equipment of the present position. Presets the
menu. It begins a fishing hot spot.

3 [Cursor]

Selects the menu item. Changes the set value.
Moves the VRM marker. IMoves the marker fo r notifying the event.

4 [MENU] Opens or closes the menu.
5 [F2] Recalls directly the item preset.
6 [ RANGE ] Changes the range setting.

7 [GAIN(HF) Knob]

Rotate: Changes the gain value.
Press: Recalls the gain select.

8 [GAIN(LF) Knob]

Rotate: Changes the gain value.
Press: Recalls the gain select.

9

Switches to the High frequency or Low frequency of echo sounder
image, zoom and navigation menu.

10 [BRILL ]/ Power

Press: Power on. Adjusts the brilliance and brightness of panel.
Long-press: Power off.

1
2

4

5
6

7

8

9

10

3

【DISP】

Chapter 1 Basic Operation CVS-128

1-2 0093112802-01

How to remove the hard cover

While widening the claws at right and left sides of hard cover, draw the hard cover towards you.

When removing CVS-128 Display unit

To prevent dust from entering, cap the connector at the rear of CVS-128 Display unit and the power
cable with caps.

Install the supplied cap to the transducer cable as shown in the figure and cap it.

Caution: Do not pull the cable strongly. If you do so, it will be broken.

The clean of CVS-128 Display unit

The cleaning of the display unit goes after removing the front-f rame. Af ter removing the front-fra me, use
a synthetic detergent and OA cleaner and wipe the display unit lightly. Then dry sufficiently, and return
the front- frame to original position.

Caution: The display unit has a special coating. Do not use a solvent such as paint thinner,

acetone, alcohol, and benzene, etc.

Caution: Strong rubbing may cause bruising and scratching.

Claw

CVS-128 Chapter 1 Basic Operation

0093112802-01 1-3

1.2 Power On/Off

Power on

1 Press the [BRILL ] key to power on.

The startup menu is displayed. When
started up, the memories (ROM, RAM) are
automatically checked. When checking is
normally finished, the menu below is
displayed.

Caution: If an error occurs in the memory

check, the LED on the operation
panel blinks. The unit may be not
function normally. If you suspect
trouble, contact the dealer of your
purchase or our company.

2 Language Selection at Initial Startup.

When powering on first, after the [Initialize] is
processed, the [Language] menu is displayed.

Select the language with [

]

key or [] key.
(The language can be selected by rotating the
[GAIN (HF) Knob]or [GAIN (LF) Knob].)

3 Press the [MENU] key to decide the

language.

4 After a few seconds pass, the menu

selected in [DISP] is displayed.

Caution: In addition to English, Japanese,

there are several compatible
languages.

Explanation of the display:

Type of Gain
H: High frequency gain
L: Low frequency gain

Type of Range
R: M: Manual Range
R: A: Auto Range
R: AS: Auto Shift

Power off

1

When powering off, keep pressing the
[BRILL

] key for 3 seconds.
The remaining time for the power to shut off
is displayed on the menu.

Alarm of Power Voltage

If detecting the malfunction of the voltage, the

icon blinks and the alarm beeps.

Caution: In case of the low voltage or the

high voltage, it shuts down. The
precision of Power Voltage is ± 0.5 V.

Language

English

日本語

Rainbow pattern

Time mark

Gain

Ran

g

e

Function icon

A

larm icon

Event icon

Fish

Schools of fish

Oscillation line

Depth

Chapter 1 Basic Operation CVS-128

1-4 0093112802-01

1.3 LCD Brilliance Adjustment

Adjustment of LCD Brilliance

The brilliance of the display can be adjusted to
facilitate visualization.

The [Lcd brill] and [Panel brill] can be switched
every time when pressing the [BRILL

] key.

1 Press the [BRILL ] key for a short period of

time to display the menu ([Lcd brill]).

2 Rotate the [GAIN (HF) Knob] or [GAIN (LF)

Knob]. When “1” is selected, it is darkest.
When “10” is selected, it is brightest.

Lcd brill
10

3 Press the [MENU] key to close the menu.

Brightness Adjustment of Panel
Brilliance

The brightness of panel can be adjusted.
The [Lcd brill] and [Panel brill] can be switched

every time when pressing the [BRILL

] key.

1 Press the [BRILL ] key for a short period of

time to display the menu ([Panel brill]).

2 Rotate the [GAIN (HF) Knob] or [GAIN (LF)

Knob]. When “1” is selected, it is darkest.
When “10” is selected, it is brightest.

Panel brill
10

3 Press the [MENU] key to close the menu.

1.4 Switch-over of Display mode

7 kinds of displays are provided in all. Select the
display suitable for your purpose.

1 Press the [DISP] key.
2 Select the display you desire to display.

(Press the [

] key or [ ] key.)
(The set item can be selected by rotating the
[GAIN (HF) Knob] or [GAIN (LF) Knob].)

(H): High frequency
(L): Low frequency
NAV1: Navigation display1
NAV2: Navigation display2

3 Press the [MENU] key to close the menu.

Normal Image (Low frequency, High
frequency)

Low frequency (50 kHz)

Since the beam width is wide, the search range
becomes wide so that the beam can search the
deep depth.

High frequency (200 kHz)

Since the beam width is narrow, it is hard to be
interfered by noise and bubble in the sea so that
the schools of fish can be searched in a high
resolution.

(50 kHz)

(200 kHz)

Low frequency

High frequency

Disp

NAV1

Normal (H)

Zoom (H)
Dual Freq
Zoom (L)
Normal (L)
NAV2

CVS-128 Chapter 1 Basic Operation

0093112802-01 1-5

Dual frequency

The High frequency image can be displayed in
the right half side and the Low frequency image
can be displayed in the left half side. Since the
beam width differs depending on freq uency, the
schools of fish and sea bottom look different.

Zoom (Low frequency, High frequency)

A part of normal image can be zoomed. (1) [BTM.] (Bottom), (2) [B.D.] (Bottom Discrimination), (3)
[Zoom], (4) [B.Z.] (Bottom Zoom) and (5) [B.F.Z.] (Bottom Follow Zoom) are provided for zoom.

The unit is set to (1) [BTM.] at ex-factory. To change to other zoom display, set it in the menu. (See
[2.15 Selection of Zoom])

Zoom type Purpose

Zoom start position

Zoomed range

Bottom It is convenient to see the

schools of fish near the
bottom.

It displays the position of
the bottom in the fixation
in the display bottom part.

It displays the bottom and
upper in the zoom.

Bottom
Discrimination

It is convenient to see the
schools of fish and a
bottom quality near the
bottom.

It displays the position of
the bottom in the fixation
in the position of 1/4
under the display.

It displays the bottom and
upper in the zoom, it
displays under the bottom in
the ordinary.
(Under the bottom, it doesn't
display in the zoom).

Zoom

It is convenient to see the
specified range in the
zoom.

It displays a zoom start
position in the fixation at
the top of the display.

It displays in the zoom from
the zoom start position to the
range you set.

Bottom Zoom It is convenient to see the

schools of fish near the
bottom and the form of
the bottom.

It displays the position of
the bottom in the position
which is the same as the
ordinary display.

It displays upper side of the
bottom in the zoom except
the bottom.

Bottom Follow
Zoom

It is convenient to see the
schools of fish near the
bottom and the form of
the bottom.

It always displays the
position of the bottom in
the lower part of the
display.

It displays the bottom and
upper and lower sides in the
zoom.

Low frequency image

High frequency image

Chapter 1 Basic Operation CVS-128

1-6 0093112802-01

(1) Bottom

(2) Bottom Discrimination

(3) Zoom

Zoom start position

Zoomed range

Zoomed range

Zoomed range

30.0

The display width of zoom
is displayed in orange.

Normal image

Zoom image

The display width of zoom
is displayed in orange.

Normal image

Zoom image

30.0

The display width of zoom
is displayed in orange.

Normal image

Zoom image

30.0

CVS-128 Chapter 1 Basic Operation

0093112802-01 1-7

(4) Bottom Zoom

(5) Bottom Follow Zoom

Navigation Menu (NAV1, NAV2)

The navigation menu can be displayed at the left side on the display. To display the information other
than depth, sensors need to be connected. (See [2.16 Selection of NAV Display])

Caution: Requires position data from GPS sensor.

Depth

Wat

er temp

C

ourse

XTE

30.0

The display width of zoom
is displayed in orange.

Normal image

Zoom image

Zoomed range

Zoomed range

The image below the bottom

is not zoomed.

30.0

The display width of zoom
is displayed in orange.

Normal image

Zoom image

Chapter 1 Basic Operation CVS-128

1-8 0093112802-01

1.5 Switch-over of Range

The range of measured depth displayed on the
display can be changed.

To meet your purpose, select the range of
measured depth.

Setting the range switching to auto
range

By following automatically the bottom, the image
of echo sounder in the suitable range of
measured depth can be displayed.

This mode is convenient to display always the
range from sea level to bottom.

The range value
changes

1 Press [▲] or [▼] key of [▲RANGE▼].
2 Select the [Auto Range]. (Press [▲] or [▼]

key of [▲RANGE▼])

3 Press [MENU] to close the menu.

When [Auto Range] is set, the [R:A] is
displayed a the upper side of menu.

Caution: At auto range, this sounder can

sound the area up to the maximum
range registered. The maximum range
is 800 m. At the initial setup, the range
is up to 500 m. (See [2.11 Preset of
Range])

Setting the range switching to Manual
range

The range can be manually selected:

1 Press [▲] or [▼] key of [▲RANGE▼].
2 Select the range you desire to set. (Press

[▲] or [▼] key of [▲RANGE▼])

3 Press the [MENU] key to close the menu.

When the [Manual] is set, the [R: M] is
displayed at the upper side of menu.

1.6 Gain Adjustment

The gain can be adjusted in the auto mode (Echo
sounder mode, Depth mode) or manual mode.

[Cruising]

Eliminating the weak echo, it displays clearly the
sea bottom of strong echo.
It is suitable for cruising to the fishery ground.

[Fishing]

It displays clearly the weak echo reflected from
the school of fish.
It is suitable for searching the schools of fish.

Basic Operation of Gain

When [GAIN (HF) Knob] or [GAIN (LF) Knob] is

pressed twice, the screen of [Gain select] is
displayed.

By rotating the [GAIN (HF) Knob] or [GAIN (LF)
Knob], the gain adjustment or auto gain can be
selected.

Caution: The high frequency can be set by

[GAIN (HF) Knob] and the low
frequency can be set by [GAIN (LF)
Knob].

Range

5.0

10.0

50.0

80.0

100.0

150.0
300
500

A

uto shift

A

uto range

Range

5.0

10.0

50.0

80.0

100.0

150.0
300
500

A

uto shift

A

uto range

CVS-128 Chapter 1 Basic Operation

0093112802-01 1-9

Caution: When only high frequency is

displayed, no gain adjustment at low
frequency is available. When only low
frequency is displayed, no gain
adjustment at high frequency is
available.

Selecting the auto gain

When the [Cruising] or [Fishing] is set, the gain
can be fine-adjusted.

1 Press [GAIN (HF) Knob] twice, and [Gain

select] is displayed. (The high frequency is
explained below.)

Caution: The low frequency can be set by

[GAIN (LF) Knob].

2 Select the [Cruising] or [Fishing] by rotating

the [Knob].

3 Press the [MENU] key to close the menu.

When the [Cruising] is set, the [L: AC] [H:
AC] is displayed at the upper side of menu.
When the [Fishing] is set, the [L: AF] [H: AF]
is displayed at the upper side of menu.

Adjusting the gain by auto

The auto gain adjustment can be set to [Auto
adjust high] or [Auto adjust low]. (Sett ing:-10 ~

10)

1 Turn [GAIN (HF) Knob], and [Auto adjust

high] is displayed. (The high frequency is
explained below.)

Caution: The low frequency can be set by

[GAIN (LF) Knob].

2 Fine-adjust the gain by rotating the [GAIN

(HF) Knob]. The [Cursor] key menu position
can be moved.

3 Every time when pressing the [Gain select]

and [Auto adjust high] are alternately
displayed.

4 Press the [MENU] key to close the menu.

Selecting the manual gain

Adjustment of gain can be done manually.

1 Press [GAIN (HF) Knob] twice, and [Gain

select] is displayed. (The high frequency is
explaied below.)

Caution: The low frequency can be set by

[GAIN (LF) Knob].

2 Select the [Manual] by rotating the [Knob].
3 Press the [MENU] key to close the menu.

Manual adjustment of the gain

When the image of High frequency only is
displayed on the display, the High frequency gain
can be adjusted. (Settin g: 0 ~ 1 0)

When the image of Low frequency only is
displayed on the display, the Low frequency gain
can be adjusted.

Caution: If you increase the gain too much,

noise will appear on the entire image,
resulting in an unclear image. Adjust
properly the gain so that the optimum
image can be always displayed.

Over-gain Under-gainOptimum

1 Turn [GAIN (HF) Knob] to display [Auto

adjust high]. (The high frequency is
explained below.)

Caution: The low frequency can be done

by [GAIN (LF) Knob].

2 Adjust the gain by rotating the [Knob]. The

[Cursor] key menu position can be moved.

Stop increasing of the gain just before noise
appears on the image.

3 Every time when pressing the [Gain select]

and [Gain (H)] are alternately displayed.

A

uto adjust high

0

Gain select

Manual

Cruising

Fishing

Gain(H)

6.0

Chapter 1 Basic Operation CVS-128

1-10 0093112802-01

4 Press the [MENU] to close the menu.

The present set value of frequency (High
frequency or Low frequency) adjusted last is
displayed at the upper left side of menu.

Example:
The High frequency gain is 8.0 → H: 8.0.

1.7 Use of [EVENT] key

By pressing the [EVENT] key , three functions of
[Store Position]. [Store Image] and [Fishing hot
spot] are available.

The fishing hot spot is the function to instruct
your boat to navigate easily to a point where you
desire to go back.

[Store pos]: The latitude and longitude of a point
can be stored.

[Store image]: An image of the echo sounder can
be stored in the internal memory.

[Fishing hot sopt]: The WPT navigation starts,
using the latitude and longitude of a point which
is set as a destination by pressing the [EVENT]
key. Simultaneously, the latitude and longitude of
the point can be stored in the destination list.

Caution: Requires position data from GPS

sensor.

Selecting the event

Select the functions when pressing the [EVENT]
key.

1 Press the [MENU] key.
2 Select [System] → [EVENT Key set]. (Press

the [

] key or [ ] key or [ ] key) (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Change the setting of [EVENT key set].

(Press the [

] key or [ ] key)

5 Press the [MENU] to close the menu.

Preseting the destination

When you find the school of fish or tide, its
location can be preset as a destination.
(10 locations at maximum)

When presetting the destination, switch [System]
→ [EVENT Key set] → [Store pos]. (See [1.7 Use
of [EVENT] key Selecting the event])

1 In the state that no other key is pressed,

press the [

] key or [ ] key.

2 Move the cursor (red line) with the [ ] key or

[

] key to the location to be preset as a

destination.

3 Press the [EVENT] key.

When decided, the red line is drawn at the
designated location on the echo sounder
menu and the latitude and longitude of
designated location are registered in the
destination list.
At this moment, the list number of preset
destination is displayed.

4 When the list of waypoint is full, delete the

list. (See: [2.13 Preset/ WPT edit/ WPT
delete of Destination], [Delete the
destination])

R: M 12.6 VH: 8.0

EVENT key set
Store pos

Store image
Fishing hot spot

Cursor (Red line)

L H

CVS-128 Chapter 1 Basic Operation

0093112802-01 1-11

5 After a certain time passes, the message

disappears and presetting the destination is
finished.

Caution: When pressing the [EVENT] key,

if [In out] → [NMEA output data] →
[TLL] is set to ON, the latitude and
longitude of location above-designated
is output to the navigation system
connected.

Caution: If the destination list is full, the

preset destination list is not deleted,
showing the message that the list is
fully filled.
After a certain time passes, the
message disappears.

Store the image

When you find the schools of fish, its location can
be stored as a destination.
(10 locations at maximum)

When storing the image, switch [NAV] →
[EVENT Key set] → [Store pos]. (See [1.7 Use of
[EVENT] key. Selecting the event].)

1 Press the [EVENT] key.

2 After a certain time passes, the image of

echo sounder presently displayed is stored
and the list number of stored image is
displayed.

3 After a certain time passes, the message

disappears and storing the image is finished.

Caution: If the destination list is fully filled,

the preset destination list is not deleted,
showing the message that the image is
fully filled. After a certain time passes,
the message disappears.

As for deletion and recall of images, see
[2.14 Store/Recall/Deletion of image].

Image data list # 1 is registered

A

list of Pic is full.

Registration is not completed.

A Wpt list is full.
Registration is not completed

L H

L H

Waypoint list # 1 is registered

Processing is displayed.

Cursor
(Red line)

Chapter 1 Basic Operation CVS-128

1-12 0093112802-01

Fishing hot spot

Leads you back to your favorite fishing hot spots
or other previously stored positions in memory
with input from optional GPS sensor. (See [2.13
Preset/ WPT edit/ WPT delete of Destination])

To perform the fishing hot spot, it is necessary to
select [System] → [EVENT key set] → [Fishing
hot spot]. (See [1.7 Use of [EVENT] key
Selecting the event])

1 In the state that no other key is pressed,

press the [

] key or the [ ] key.

2 Move the cursor (red line) to a point you

desire to go back with the [

] key or [ ] key.

3 Press the [EVENT] key.

When you decide, the red line is drawn on
the image of the fish finder at the point you
designate and the latitude and longitude of
the point you designate is stored in the
destination list.
At this moment, the number of the stored
destination list is displayed.

4 The navigation display (NAV1) is displayed

and the WPT navigation start s.

5 To stop the fishin g hot spot, delete

destination navigation. (See: [2.13 Preset/
WPT edit/ WPT delete of Destination],
[Cancel the NAV].)

Note: The display of NAV1 is displayed.

1.8 Use of [F1] / [F2] key

When factory-shipped, the [Image Speed] is
assigned to the [F1]/[F2] key. The function
settable to the [F1]/[F2] key can be selected
among [Image Speed], [IR], [Color Rejection],
[Noise Rejection], [Shift], [Zoom Range], [Zoom
Start], [A scope], [White line], [Background color],
[Disp width], [Nav start], [NAV1], [NAV2], [Image
swap], [Image recal] and [Sona-tone]. Set the
function frequently used for your convenience.

Selecting the [F1]/[F2] key

1 Press the [F1] key or [F2] key.
2 Select the setting with [

]

key or [] key.

Example [Image speed]

Image Speed

2/1

1/1

stop
1/1.5
1/2
1/2.5
1/3
1/3.5
1/4
1/4.5

3 Press the [MENU] key to close the menu.

Cursor (Redline)

L H

L H

CVS-128 Chapter 1 Basic Operation

0093112802-01 1-13

Preset of [F1] / [F2] key

1 Press the [MENU] key.
2 Select [System] → [F1 key set] or [F2 key

set]. (Press the [

] key or [

]

key or []

key. ) (See [2.1 How to operate the menu])

3 Press the [ ] key.
4 Select the function. (Press the [

]

key or []

key)

5 Press the [MENU] key to close the menu.

The icons of functions preset are displayed
at the upper right side on the menu.

1.9 Operation of VRM

The VRM (movable marker) shown by the green
line can be moved up and down.

It is convenient to measure the depth by aligning
with the target such as school of fish.

1 In the state that no other key is pressed,

press the [

] key or [ ] key. The movable

marker (straight line) is displayed.

2 Press the [ ] key or [ ] key. The movable

marker moves up and down.
The movable marker and the numerical of
marker depth are simultaneously
highlighted.

When displaying dual images, if the [

] key

or [

] key is pressed, the movable marker

moves to the neighboring image.

Caution: When several seconds pass

after finishing the VRM operation, the
numerical of marker depth becomes
normal display.

Caution: If VRM is moved to the top of

the display, the VRM can be
disappeared.

F1 key set
Image Speed

IR
Color Rejection
Noise Rejection

A

scope

Shift
Zoom Range
Zoom Start

Background Color

White line

Movable marke

r

Marker Depth

20.0

←

Image speed

←

IR

←

Color rejection

←

Noise rejection

←

Shift

←

Zoom Range

←

Zoom Start

←

A

scope

←

White Line

←

Background colo

r

←

Image recall

←

Image swap

←

NAV1

←

NAV2

←

Disp width

←

Sona-tone

Chapter 1 Basic Operation CVS-128

1-14 0093112802-01

1.10 Display of fish information

Specific response can be displayed as [Fish
symbol].

For detection of fish information, 2 frequencies,
200 kHz and 50 kHz are used.

Only in case echo comes up in both frequencies,
the detection can be made.

By [Symbol info], the magnitude and the value of
depth of the response can be displayed.

Caution: Fish information is to display the

specific responses in a way easy to
watch. Displays of [Fish symbol] do not
always mean that there is fish there.

Caution: The area where [Fish symbol]

can be displayed is from 3 m to 100 m.
(ft:10 to 330, fm:2 to 54, I.fm:2 to 60)

Caution: [Fish symbol] is not displayed in

a range that is deeper than 120m.
(ft:350, fm:60, I.fm:70)

Display the fish symbol/Stop the
display of fish symbol

1 Press the [MENU] key.
2 Select [Disp] → [Fish symbol]. (Press the [ ]

key or [

] key or [ ] key.) (See [2.1 How to

operate the menu])

3 Press the [ ] key.
4 Select the symbol to be displayed on the

screen. (Press the [

] key or [ ] key)

5 Press the [MENU] key to close the menu.

When this function is made to be effective, the
icon is displayed at the top of the screen.

Caution: When [Fish symbol] on the

screen does not always mean that the
response shows fish.

Selecting the symbol info

[Symbol info] is effective only when [Fish symbol]

is displayed.

1 Press the [MENU] key.

2 Select [Disp] → [Symbol info]. (Press the [ ]

key or [

] key or [ ] key.) (See [2.1 How to

operate the menu])

3 Press the [ ] key.
4 Select the information associated with [Fish

symbol] (Press the [

] key or [ ] key.)

Caution: The display of [Size] is

expressed in cm.

5 Press the [MENU] key to close the menu.

Caution: The magnitude by [Symbol info]

would not be always the response from
fish. And it may be incorrect due to
various environmental conditions.
Please take these as reference.

Caution: The value of depth by [Symbol

info] would not be always the response
from fish. That shows the point that
responsed specifically.

Fish symbol

Symbol 1

Symbol info

OFF
Depth

Size

CVS-128 Chapter 1 Basic Operation

0093112802-01 1-15

The values displayed by this function may be
incorrect depending on various environmental
conditions. In use of these values, please
understand the following factors of error, and
use them as reference:

【Factors of error】

1 When there are overlapping responses,

all of them may be displayed to show the
magnitude of a point.

2 The strength of reflection may depend on

the output of transducer unit and may
result in a factor of error.

3 The strength of reflection may depend on

the kind of fish and may result in a factor
of error. As for the fish such as the squid
which don't have an air bladder, the error
is big.

4 Fish banks, fishing net, fishing equipment,

air bubbles and floating objects, etc. may
be detected and displayed.

5 When the transducer unit is mounted in

inner-hull, there may be cases where
response cannot be detected depending
on attenuation, and large error may be
generated.

6 The strength of reflection may depend on

the difference of ship handling such as
stoppage and cruising, and may result in
a factor of error.

7 Each transducer unit may have difference

in transmission/receiving performance to
cause error.

Points to note in use of
fish symbol

CVS-128 Chapter 2 How to use the menu

0093112802-01 2-1

Chapter 2 How to use the menu

2.1 How to operate the menu

Display the menu/Stop the display of
menu

1 Press the [MENU] key.

The menu and explanation of operation are
displayed.

2 Press the [MENU] key.

The menu and explanation of operation
close.

Menu Operation

1 When the menu is displayed, press the [

]

key or [

]

key to select the menu name.
Depending on the selected menu name,
the content in the set item column at the
right side changes. (The menu name can
be selected by rotating the [GAIN (HF)
Knob] or [GAIN (LF) Knob].)

2 Press the [ ] key.

The cursor appears in the set item column.
(The cursor appears by pressing the [GAIN
(HF) Knob] or [GAIN (LF) Knob].)

3 Select the set item you desire to change

with the [

]

key or [] key.
(The set item can be selected by rotating
the [GAIN (HF) Knob] or [GAIN (LF) Knob])

4 Press the [

]

key.
The set menu corresponding to the
selected item is displayed.
(It can be displayed by rotating the [GAIN
(HF) Knob] or [GAIN (LF) Knob].)

5 Change the set content with the [

]

key or

[

]

key.

(It can be changed by rotating the [Knob])

6 Press the [

]

key.
The cursor returns to the set item column.
(It can be displayed by rotating the [GAIN
(HF) Knob] or [GAIN (LF) Knob])

Menu column

A

djust

Disp

D.range

A

larm1

A

larm2
NAV
Image
Sonar

Next

Image speed

IR
Color rejection
Noise rejection
TVG

TX powe

r

Return

1/1

Strong

0%

0

Medium

A

uto

Guide

Name of menu selected

Setting item column

It is displayed when the [Operation Guide] is set to ON.

(See [2.18 Explanation of Menu Item Display the
operation guide / Stop the display of operation guide].)

Setting value

Cursor

Gain (TD)

System

Disp width

Shift

Zoom select
Zoom range
Zoom start

Range preset

Return

0m

0m

10.0m

BTM.

A

djust

Image

D.range

A

larm1

A

larm2
NAV
Disp
Sona

r

Next

System

Center

Disp width

Shift

Zoom type
Zoom range
Zoom start

Range preset

Return

0m

10.0m
0m

BTM.

A

djust

Disp

D.range

A

larm1

A

larm2
NAV
Image
Sonar

Next

System

Center

Shift

10

0-300 m

Chapter 2 How to use the menu CVS-128

2-2 0093112802-01

7 To select the menu name of other, press

the [

] key.

The cursor returns to the menu column.

8 Press the [MENU] key to close the menu.

2.2 Changing of Image Speed

The image speed of echo sounder can be
changed. Even if the schools of fish and bottom
are same, the image changes depending on the
image speed.

The setting of image speed is shown by the
comparison with the normal image speed “1/1”.

“2/1” image speed is two times the normal
image speed. “1/2” is a half time the normal
image speed. When “Stop” is selected, the
image speed is stopped.

1 Press the [MENU] key.
2 Select the [Adjust] → [Image Speed]. (See

[2.1 How to operate the menu].)

3 Press the [ ] key.
4 Change the setting of [Image Speed].

(Press the [

] key or [ ] key.)

Image speed

2/1

1/1

Stop
1/1.5
1/2
1/2.5
1/3
1/3.5
1/4
1/4.5

5 Press the [MENU] key to close the menu.

2.3 Rejection of Interference

Interference Rejection

The interference noise from the echo sounder
of other boats can be reduced.

If a neighboring boat uses the echo sounder
having the same frequency and same firing
times as those your boat has, the interference
noise may be displayed. If you set the
interference rejection, the interference noise
can be reduced. In the order of weak → strong,
the noise rejection capability becomes high.

The difference of images based on the different
settings of [Intererence reduction]

1 Press the [MENU] key.
2 Select the [Adjust] → [Interference Rejection].

(See [2.1 How to operate the menu].)

3 Press the [ ] key.
4 Change the setting of [Inference Rejection].

(Press the [

] key or [ ] key.)

IR

OFF

Weak

Strong

5 Press the [MENU] key to close the menu.

OFF

Weak

Strong

Image of school of fish

Interference image

CVS-128 Chapter 2 How to use the menu

0093112802-01 2-3

2.4 Color Rejection of Weak
Echo

Color Rejection

The color of weak echo can be rejected.

Rejecting noise on the entire image and weak
echo around the school of fish makes it easier
to see the school of fish. It is the convenient
function when displaying the echo stronger
than the specific signal. (Setting: 0 ~ 50 %)

1 Press the [MENU] key.
2 Select the [Adjust] → [Color Rejection].

(See [2.1 How to operate the menu])

3 Press the [ ] key.
4 Change the setting of [Color Rejection].

(Press the [

] key or [ ] key.)

5 Press the [MENU] key to close the menu.

2.5 Rejection of Noise

Noise Rejection

The influence of noise can be reduced.

Due to echo reflected from plankton and trash,
the speck-like noise may appear on the entire
image. Setting the [Noise rejection] reduces the
speck-like noise and makes it easier to see the
image of school of fish. (Setting: 0 ~ 10)

The greater the set value becomes, the
stronger the effect of noise rejection becomes.

1 Press the [MENU] key.
2 Select [Adjust] → [Noise rejection]. (See

[2.1 How to operate the menu])

3 Press the [ ] key.
4 Change the setting of [Noise rejection].

(Press the [

] key or [ ] key)

Noise Rejection

5

5 Press the [MENU] key to close the menu.

2.6 Setting of Shift

The [Shift] (Manual Shift) and [Auto Shift] are
provided.

Manual Shift (Shift):

The image range is shifted up and down.
(Setting: m, fm, I.fm: 0 ~ 300, ft: 0 ~ 1000)

Auto Shift:

The image is automatically shifted so that the
bottom is always displayed.

Setting of Manual Shift

The scope of range starting with the shift value
is displayed.

1 Press the [MENU] key.
2 Select [D. range] → [Shift]. (See [2.1 How

to operate the menu])

3 Press the [ ] key.
4 Change the set value of [Shift]. (Press the

[

]

key or [

] key)

Shift

10

0~300 m

5 Press the [MENU] key to close the menu.

Color Rejection

0

%

Chapter 2 How to use the menu CVS-128

2-4 0093112802-01

Setting of Auto Shift

The image is automatically shifted so that the
bottom is always displayed.

1 Press [▲] of [▼] key of [▲RANGE▼].
2 Select the［Auto shift］(Press [▲] of [▼] key

of [▲RANGE▼]）

3 Press the [ ]key.

4 Select a range at [Auto shift]. (Press the

[

] key or [ ] key)

5 Press the [MENU] key to close the menu.

When the [Auto shift] is set, the [R : AS] is
displayed at the upper side of menu

2.7 Setting of Zoom Range

Set the zoom range in each mode of [BTM],
[Bottom Discrimination], [Zoom], [Bottom Zoom]
and [Bottom Follow Zoom]

The zoom range of each mode is identical.

(See [1.4 Switch-over of Display mode])

(Setting: m: 2.5 to 200, fm, I.fm: 2.5 to 150,

ft:10.0 to 650)

Zoom Range

1 Press the [MENU] key.
2 Select [D. Range] → [Zoom range]. (See

[2.1 How to operate the menu])

3 Press the [ ] key.
4 Change the set value of [Zoom range].

(Press the [

] key or [ ] key)

Zoom Range

10.0

m

5 Press the [MENU] key to close the menu.

2.8 Setting of Zoom Start

Select the zoom start in the [Zoom].

(See [1.4 Switch - over of Display mode])

(Setting: m: 0 to 800, fm, I.fm: 0 to 700, ft: 0 to

2800)

Zoom Start

1 Press the [MENU] key
2 Select [D. range] → [Zoom start] (See [2.1

10.0

20.0

50.0
100
160

300
500

A

uto range

A

uto shift

5.0

10.0

20.0

50.0
100
160

300
500

A

uto range

A

uto shift

5.0

Range

４０．０

Range

４０．０

Range

Range

CVS-128 Chapter 2 How to use the menu

0093112802-01 2-5

How to operate the menu])

3 Press the [ ] key.
4 Change the set value of [Zoom start].

(Press the [

] key or [ ] key)

Zoom start

10

0~800 m

5 Press the [MENU] to close the menu.

2.9 Setting of Background
Color

Responding to the ambient brightness, the
background color of display can be changed.

1 Press the [MENU] key.
2 Select [Disp] → [Background color]. (See

[2.1 How to operate the menu])

3 Press the [ ] key.
4 Change the setting of [Background color].

(Press the [

] key or [ ] key)

5 Press the [MENU] to close the menu.

2.10 Setting of White Line

As the surface of bottom is marked with the
white line of constant width, the school of fish at
the bottom can be easily identified.

W

hite line

1 Press the [MENU] key
2 Select [Disp] → [White line]. (See [2.1 How

to operate the menu])

3 Press the [ ] key.
4 Change the setting of [White line].

“1” is narrowest. “5” is widest.
In the auto mode, responding to the
strength of echo reflected from the bottom,
the width of white line changes. (Press the
[

] key or [ ] key)

White line

OFF

1

2
3
4
5
Auto

5 Press the [MENU] key to close the menu.

2.11 Preset of Range

The range switched with the [

RANGE ] key

can be set.

Preset the set value suitable for you purpose.

(Setting: m: 2.5 to 1200, fm, I.fm: 2.5 to 700, ft:

10 to 3600)

1 Press the [MENU] key.
2 Select [D.range]→[Range preset]→[Range

1 to 8]. (See [2.1 How to operate the
menu])

3 Press the [ ] key.
4 Select [Range 1 to 8]. (Press the [ ] key or

Background color

Pale blue

Marine blue

Blue
Dark blue
Black
Darkkhaki
Mediumseagreen
Light grey

White

Night mode

Chapter 2 How to use the menu CVS-128

2-6 0093112802-01

[ ] key)

Caution: Select [Forward], and press [

]

key to return to the previous menu.

5 Press the [ ] key.
6 Select the set value of [Range 1 to 8].

(Press the [

]

key or [] key)

Range1

20.0

m

7 Press the [MENU] key to close the menu.

2.12 Setting of Alarm

6 alarms of bottom alarm, fish alarm, water temp
alarm, speed alarm, arrival alarm and XTE alarm
can be set.

They are notified by alarm sound and alarm
display.

[Bottom alarm] issues the alarm when the
position recognized as the bottom is shallower
than the upper limit or deeper than the lower
limit. It is convenient when keeping the specific
depth.

(Setting: m: 0 to 800, fm, I.fm: 0 to 700, ft: 0

to 2800)

[Fish alarm] issues the alarm when an echo
recognized as school of fish exists in the set
range.

(Setting: m: 0 to 800, fm, I.fm: 0 to 700, ft: 0

to 2800)

It is convenient for you to judge whether the
echo of school of fish is present or not.

(Setting:

m: 0 to 800, fm, I.fm: 0 to 700, ft: 0 to 2800)

Caution: In the [Level], select the

strength of echo reflected from the
schools of fish in the [Fish alarm].

[Water temp alarm] issues when the water temp
is within or out of the set range. It is convenient
to keep the specific water temp region. (Setting:

- 5 to 45 ℃, 23 to 113 ºF)

[Speed alarm] issues when the boat speed is
faster or slower than the set range. It is
convenient when the speed limit is obliged.
(Setting: 0 to 80 kn, 0 to 148 km/h)

[Arrival alarm] can be used in the state that the
destination is set. The alarm is issued when your
boat arrives within a certain range of destination.
A certain range is set in the [NAV alarm range].

(See [1.7 Use of [EVENT] key.)

[XTE alarm] can be used in the state that the
destination is set. The alarm is issued when your
boat is off a certain distance from the course on
the line drawn straightly from destination to the
location when setting the destination. A certain
distance is set in the [NAV alarm range].

Caution: In the [NA V alarm range], select

the alarm range of [Arrival alarm]
and [XTE alarm]. (Setting: 5 to 999
m)

Caution: The setting range of [Arrival

alarm] and [XTE alarm] can not be
separately set.

Stopping the alarm sound

To stop the alarm sound and the alarm display,
press [MENU] key.

Disp

D.range

A

larm1

A

larm2

NAV
Image

Sonar
System

Prev

5.0 m

Next

Range 1
Range 2
Range 3
Range 4

Range 5
Range 6
Range 7
Range 8

Return

10.0 m

20.0 m

50.0 m
100 m
160 m
300 m
500 m

A

djust

CVS-128 Chapter 2 How to use the menu

0093112802-01 2-7

Setting the alarm

1 Press the [MENU] key.
2 Select your desired alarm from [Alarm 1] or

[Alarm 2]. (See [2.1 How to operate the
menu].)

3 Press the [ ] key.
4 Select the [ON] of alarm you desire. (Press

the [

] key or [ ] key)

5 If the setting of [Alarm range] is provided in

the alarm desired, select the alarm range.

(See [2.1 How to operate the menu])

6 Change the set value of alarm range.

(Press the [

] key or [ ] key)

7 Press the [MENU] key to close the menu.

Release the alarm

1 Press the [MENU] key.
2 Select the alarm to be released from

[Alarm 1] or [Alarm 2]. (See [2.1 How to
operate the menu])

3 Press the [ ] key.
4 Select the [OFF] of alarm to be released.

(Press the [

] key or [ ] key)

5 Press the [MENU] key to close the menu.

Confirm the alarm state

The set state of [Bottom alarm] and [Fish alarm]
can be confirmed on the bar at the right corner
of display. However, when the display is out of
the range, they are not displayed.

When [Water temp alarm], [Speed alarm],
[Arrival alarm] or [EXT alarm] is ON, the
corresponding icon is displayed at the upper
side of the screen.

[

Bottom alarm

]

[

Fish alarm

]

[

Speed alarm

]

[

A

rrival alarm

]

[

XTE alarm]

[ Water temp alarm ]

A

djust

Disp

D.range

A

larm1

A

larm2

NAV
Image
Sonar
System

Bottom alarm

Upper depth
Lower depth

Fish alarm

Position
Range
Level

Return

OFF

5m
50m

OFF

5m
50m
Medium

A

djust

Disp

D.range

A

larm1

A

larm2

NAV
Image
Sonar
System

Water temp alarm

Upper temp alarm
Lower temp alarm

Speed alarm

Speed limit

A

rrival alarm
XTE alarm
NAV alarm range
Return

OFF

20.0℃

15.0℃

OFF

0kn

OFF
OFF
10m

Next

Next

Chapter 2 How to use the menu CVS-128

2-8 0093112802-01

2.13 Preset/WPT edit/WPT
delete of Destination

NAV Start

The NAV can be started by selecting the
destination from the destination list.

To perform the NAV start, the destination must
be preset.

(See [1.7 Use of [EVENT] key])

Caution: Requires position data from

GPS sensor.

1 Press the [MENU] key.
2 Select [NAV] → [NAV start]. (See [2.1 How

to operate the menu])

3 Press the [ ] key.
4 Select the [Destination list] preset. (Press

the [

] key or [ ] key)

Caution: The list No. selected is reversed

in red.

5 Press the [ ] key.
6 Select the [Yes] in the confirmation menu.

(Press the [

] key or [ ] key)

7 Press the [MENU] key.

Then, the NAV starts.

Cancel the NAV

The NAV started can be canceled halfway.

1 Press the[MENU] key
2 Select [NAV] → [NAV cancel]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Press the [Yes]. (Press the [ ] key or [ ]

key)

NAV cancel

Yes

No

5 Press the [MENU] key. Then, the NAV is

released.

6 To return the display to the original one, the

display mode shall be switched over. (See:
[1.4 Switch-over of Display mode])

Edit the destination

By entering the latitude and longitude, the
destination can be preset.

The list preset in the past can be edit.

1 Press the [MENU] key.
2 Select [NAV] → [WPT edit]. (See [2.1 How

to operate the menu])

3 Press the [ ] key.
4 Select the list No. to be edited from the

[WPT edit] list. (Press the [

] key or [ ]

key)

5 Press the [

]

key.

6 Select the character with the [ ] key or [ ]

NAV starts

Yes

No

CVS-128 Chapter 2 How to use the menu

0093112802-01 2-9

key. (Character: A ~ Z, blank, 0 ~ 9, +, -./)

7 Move the position of characters to be

reversed with the [

] key or [ ] key.

Caution: If the values of latitude and
longitude are not entered, they are registered
as 0.

8 To end editing, press [GAIN (HF) Knob] or

[GAIN (LF) Knob].

9 After finishing the edit work, press the

[MENU] key.

10 Select the [registered] in the confirmation

menu.

11 Press the [MENU] key. Then, the edit is

finished.

Delete the destination

The destination list preset in the past can be
deleted.

The deletion takes some time.

1 Press the [MENU] key.

2 Select [NAV] → [WPT delete]. (See [2.1 How

to operate the menu])

3 Press the [ ] key.
4 Select the list number of destination to be

deleted from the [WPT delete]. (Press the
[

] key or [ ] key)

5 Press the [ ] key.
6 Select the [Yes] in the confirmation menu.

(Press the [

] key or [ ] key)

7 Press the [MENU] key. Then, the

destination is deleted and the menu closes.

Recall the stored image and preset it
as a destination

Call the stored image in the past and it can be
preset as a destination.

(See [1.7 Use of

[EVENT] key]

)

1 Press the [MENU] key.
2 Select [Image] → [Image recall]. (See [2.1

How to operate the menu].)

3 Press the [ ] key.
4 Select the image No. from the [Image

recall] list. (Press the [ ] key or [ ] key)

WPT delete

Yes

No

Chapter 2 How to use the menu CVS-128

2-10 0093112802-01

Caution: Chosen list NO. becomes

yellow.

5 Press the [ ]key.
6 Move the cursor to the location preset as a

destination with the[

]

key or [

] key and

select it.

Caution: You can switch to other stored

image with the [

] or [ ] key.

7 When starting the NAV, press the [EVENT]

key.

2.14 Store / Recall / Deletion of
Image

Store the image

The present image of echo sounder can be
stored.

To memorize, it takes some time.

To memorize the image, the [EVENT] key must
be switched to the [Store image].

1 Press the [MENU] key.
2 Select [System] → [EVENT key set]. (See

[2.1 How to operate the menu])

3 Press the [ ] key.
4 Select the [Store image]. (Press the [ ]

key or [

] key)

5 Press the [MENU] key to close the menu.
6 When the echo sounder image to be stored

appears, press the [EVENT] key.

7 When the stored image is fully filled, it

shows that the [Store image] is fully filled.
After deleting the unwanted image, try it
again.

Recall the stored image

The stored image in the past can be recalled.

During recalling, the image cannot be stored.

1 Press the [MENU] key.
2 Select [Image] → [Image recall]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Select the number of image to be recalled

from the [Image recall] list. (Press the [

]

key or [

] key)

Cursor（red line

）

H

L

EVENT key set

Store pos

Store image

Fishing hot spot

Image recall

No. Comment
1
2
3
4
5
6
7
8
9
10

P IC 0 0 0 0 1
P IC 0 0 0

02
P IC 0 0 0 03
P IC 0 0 0

04
P IC 0 0 0

05
P IC 0 0 0 06
P IC 0 0 0 07
P IC 0 0 0

08
P IC 0 0 0 09

P IC 0 0

010

CVS-128 Chapter 2 How to use the menu

0093112802-01 2-11

Caution: Chosen list NO. becomes

yellow.

5 Press the [ ] key.

Caution: When other stored image exists

beside the recall image, switch to other
image with the [

]

and [] key.

6 Press the [MENU] key to return to the

normal menu.

Delete the stored image

The stored image in the past can be deleted.

To delete, it takes some time.

1 Press the [MENU] key.
2 Select [Image] → [Image delete]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Select the number of image to be deleted

from the [Image delete] list. (Press the [

]

key or [

] key)

5 Press the [ ] key.

6 Select the [Yes] in the confirmation menu.

7 Press the [MENU] key.

Then, the preset image is deleted.

Add the comment to the stored
image

It is convenient to judge the stored image.

1 Press the [MENU] key.
2 Select [Image] → [Image comment]. (See

[2.1 How to operate the menu])

3 Press the [ ] key.
4 Select the number of image to which the

comment is added from the [Image
comment]. (Press the [

] key or [ ] key)

5 Press the [ ] key.
6 Select the character with the [

]

key or []

key. (Character: A ~ Z, blank, 0 ~ 9, +, -./)

Image delete

Yes

No

Image recall

No. Comment
1
2
3
4
5
6
7
8
9
10

P I C 0 0 0 0 1
P I C 0 0 0 02
P I C 0 0 0

03
P I C 0 0 0 04
P I C 0 0 0 05
P I C 0 0 0

06
P I C 0 0 0

07
P I C 0 0 0

08
P I C 0 0 0

09
P I C 0 0

010

Image delete

No. Comment
1
2
3
4
5
6
7
8
9
10

P I C 0 0 0 0 1
P I C 0 0 0

02
P I C 0 0 0

03
P I C 0 0 0 04
P I C 0 0 0

05
P I C 0 0 0

06
P I C 0 0 0 07
P I C 0 0 0 08
P I C 0 0 0

09
P I C 0 0

010

Image comment

No. Comment
1
2

3
4

5

6
7

8

9
10

PIC00001
PIC00002
PIC000

03
PIC00004
PIC00005

PIC00006
PIC000

07

PIC000

08
PIC000

09

PIC00010

Image comment

No. Comment
1
2

3

P I C00001

P I C00002

P I C00003

Chapter 2 How to use the menu CVS-128

2-12 0093112802-01

7 Select the comment position with the [ ]

key or [

] key.

8 To stop editing, press [GAIN (HF) Knob] or

[GAIN (LF) Knob].

9 After finishing the edit, press the [MENU]

key.

10 Select the [register] in the confirmation

menu.

11 Press the [MENU] key. Then, the edit is

finished.

2.15 Selection of Zoom

Set the zoom display with the display mode
([zoom (H)] or [zoom (L)].

The [Bottom], [Bottom Discrimination], [Zoom],
[[Bottom Zoom] and [Bottom Follow Zoom] are
provided.

(See [1.4 Switch-over of Menu])

1 Press the [MENU] key.
2 Select [D.range] → [Zoom type]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Select the zoom type. (Press the [ ] key or

[

] key)

5 Press the [MENU] key to close the menu.

For each zoom display, refer to [1.4 Switch-over
of Display mode].

2.16 Selection of NAV Display

Selection of NAV Display

The information can be displayed on the NAV
display (NAV 1, NAV2).

Caution: Requires position data from

GPS sensor.

Type of NAV Display

The following images can be displayed on the
NAV Display (NAV1, NAV2).

Simple potter Compass

Speed meter

Wpt dist dir., Time

required, Wind dir.,

Wind speed, depth,

Lat/Lon, Boat speed,

course, water temp,

Heading and XTE

Edit end

registered

Not registered

Zoom type
BTM.

Zoom
B.Z.

B.D.

B.F.Z.

1
2
3

P I C 0 0 0 0 1
P I C 0 0 0 02
P I C 0 0 0 03

Image comment

No. Comment

XTE

HDG

The time required

Wind dir.

Wind speed

RNG BRG

Course

Lat/Lon

Water temperature

Depth

Boat speed

CVS-128 Chapter 2 How to use the menu

0093112802-01 2-13

Selection of NAV Menu

1 Press the [DISP] key.
2 Select the [NAV1] or the [NAV2]. (Press the

[

] key or [ ] key)

3 [NAV1] is displayed at the right side.

4 Press the [ ] key.
5 Select either one of [Display1] to [Display4]

by operating [▲] or [▼] key. At the
locations where Display of NAV is shown, a
numerical figure ①, ②, ③ or ④ is
indicated. (The figure below is the case
where [Display 1] is selected).

Caution: When simple plotter, speed
meter or compass is displayed on the
screen, [Display2] and [Display4] cannot
be selected.

6 Press the [ ] key.

7 Select the [Display1]. (Press the [ ] key or

[

] key.)

8 Press the [MENU] key to close the menu.

2.17 Explanation of Sonar

Switch-over of Sona-tone

The sona-tone can be outputted to the built-in
speaker by selection.

The schools of fish and condition of bottom on
the display of echo sounder can be confirmed
by hearing the sonar.

1 Press the [MENU] key.
2 Select the [Sonar] → [Sona-tone]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Select the [ON] or [OFF] of [Sona-tone].

(Press the [

] key or [ ] key)

5 Press the [MENU] key to close the menu.

Connection of External Speaker

Connect the external speaker with amplifier
(option) so that you can hear the sonar easily.

Caution: The sona-tone is always

outputted. Adjust the speaker
volume with the volume provided
on the speaker.

Caution: The external speaker is an

option.

Caution: When set to [OFF], the built-in

speaker does not output the
sona-tone.
When set to [ON], the built-in speaker
outputs the sona-tone.

Display1

Simple plotter
Compass
Speed meter
Depth
Lat/Lon
Boat speed
Course

Disp

NAV1
Normal (H)
Zoom (H)
Dual freq
Zoom (L)
Normal (L)

N AV2

NAV1

Display1
Display2

Display3
Display4

NAV1

Display2
Display3
Dis

play

4

Display1

Depth

Sonar tone

OFF

ON

Chapter 2 How to use the menu CVS-128

2-14 0093112802-01

2.18 Explanation of Menu Item

The various items in the menu are explained.

Inner-hull

The reduction in sensitivity due to signal
attenuation in inner-hull use can be corrected.
(Setting: - 50 ~ 50: through-hull: 0)

1 Press the [MENU] key.
2 Select the [Adjust] → [Gain (TD)]. (See [2.1

How to operate the menu])

3 Press the [ ] key. The image displays

bottom only. It may show very strong fish
targets.

4 Set a value to display the sea bottom

continuously without interruption. For high
frequency, turn [GAIN (HF) knob] and for
low frequency, turn [GAIN (LF) knob].

5 Press the [MENU] key to close the menu.

Caution: Gain (TD) setting value widely

varies upon installation conditions
such as material of hull and
installation method. Low frequency
(50 kHz) may not be used due to large
signal attenuation.

TVG

The TVG adjusts the difference of strength
between echoes reflected from the shallower
depth and echoes reflected from deeper depth
so that the reflection can be uniformed.

The deeper the depth is, the reflected signal of
echo sounder becomes weaker due to
attenuation. Thus, comparing with the signal
reflected from the same size fish, the signal
reflected from the fish in the shallower depth is
stronger than that in the deeper depth. The
TVG adjusts the echo signal reflected from the
shallower depth to be equal to that reflected
from deeper depth by decreasing the receiver
gain so that the effect that the strength of echo
signal reflected from the shallower depth looks
the same as that reflected from the deeper
depth provided. The level of adjustment due to
the depth increases in the order of weak →
medium → strong. When set to "Strong", the
TVG provides strongest effect that reduces
various noises around oscillation line.

1 Press the [MENU] key.
2 Select the [Adjust] → [TVG]. (See [2.1 How

to operate the menu])

3 Press the [ ] key.
4 Select the [weak], [medium], [strong].

(Press the [

] key or [ ] key)

5 Press the [MENU] key to close the menu.

Caution: When the setting of [Gain

select] is either one of [Cruising] or
[Fishing], it cannot be selected.

Change the TX power

The strength of transmission output (power)
can be changed.

When the noise of interference with the
neighboring echo sounder occurs, if the powers
of transmission outputs at both sides are
weakened, the interference noise can be
suppressed.

In the [Auto] setting, the transmission output is
automatically adjusted.

Bottom

Gain (TD)

Gain (TD) L

Gain (TD) H

TVG

Weak

Medium

Strong

CVS-128 Chapter 2 How to use the menu

0093112802-01 2-15

1 Press the [MENU] key
2 Select the [Adjust] → [TX power]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Select the [TX power]. (Press the [ ] key

or [

] key.)

5 Press the [MENU] key to close the menu.

Caution: In [Auto] setting, it controls

transmission power automatically.

Display the A scope/Stop the display
of A scope

The echo strength of latest echo can be
displayed at the right side of echo sounder
display.

The strength of echo sounder image is
expressed by the horizontal width. This
expression is called [A scope].

The width for strong echo is wide and the width
for weak echo is narrow. This makes it easier
for your to see the echo.

1 Press the [MENU] key.
2 Select the [Disp] → [A scope]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 To display the A scope, select the [ON].

To stop the display of A scope, select the
[OFF]. (Press the [ ] key or [ ] key)

5 Press the [MENU] key to close the menu.

Change the display color of echo
sounder image

The [Monochrome], [8 color], [16 color] and [64
color] can be selected.

1 Press the [MENU] key.
2 Select the [Disp] → [Color tone]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Select the [Color tone]. (Press the [ ] key

or [

] key)

5 Press the [MENU] key to close the menu.

Change the depth value

The display size of depth value and the scale
value can be changed. [Detection range]
displays a propspecting range to the depth.

1 Press the [MENU] key.
2 Select the [Disp] → [Depth value]. (See

[2.1 How to operate the menu])

3 Press the [ ] key.
4 Select the size of display. (Press the [ ]

key or [

] key)

5 Press the [MENU] key to close the menu.

Display the water temp graph/Stop
the display of water temp graph

The latest water temp value and the graph of
past water temp data can be displayed.

1 Press the [MENU] key.
2 Select the [Disp] → [Water temp graph].

(See [2.1 How to operate the menu])

3 Press the [ ] key.
4 To display the water temp graph, select the

[ON].
To stop the display of water temp graph,
select the [OFF]. (Press the [

] key or [ ]

key)

5 Press the [MENU] key to close the menu.

Display Width

When the image is zoomed or the High
frequency / Low frequency displayed, the

TX power

1

Auto

20
30
40
50

60
70
80
90
100

Chapter 2 How to use the menu CVS-128

2-16 0093112802-01

display width can be changed.

1 Press the [MENU] key.
2 Select the [D.range] → [Disp. width]. (See

[2.1 How to operate the menu])

3 Press the [ ] key.
4 Select the width of image. (Press the [ ]

key or [

] key)

5 Press the [MENU] key to close the menu.

Setting of the background color of
NAV display

The color of background of navigation display

(NAV1, NAV2) can be changed.

1 Press the [MENU] key.
2 Select the [NAV] → [Background color].

(See [2.1 How to operate the menu].)

3 Press the [ ] key.
4 Select the [Background color]. (Press the

[

] key or [ ] key)

5 Press the [MENU] key to close the menu.

Setting of the echo sounder display
at NAV display

The sounder display can be selected at NAV
(NAV 1, NAV 2) to be displayed.

1 Press the [MENU] key.
2 Select the [NAV] → [NAV1 (2)]. (See [2.1

How to operate the menu])

3 Press the [ ] key.
4 Select the echo sounder display at [NAV 1]

or [NAV 2] to be displayed. (Press the [

]

key or [

]

key)

5 Press the [MENU] key to close the menu.

Image Swap

The images of echo sounder at the right and left
sides can be swapped.

1 Press the [MENU] key.
2 Select the [Image] → [Image swap]. (See

[2.1 How to operate the menu])

3 Press the [ ] key.

4 Select the swap state. (Press the [ ] key

or [

] key)

5 Press the [MENU] key to close the menu.

Display the Operation guide/Stop the
display of Operation guide

When displaying the menu, it sets whether or
not the operation guide is displayed at the lower
part on the display.

When setting to “No display of operation guide”,
the echo sounder image can be easily seen at
the menu operation.

1 Press the [MENU] key.
2 Select the [System] → [Operation guide].

(See [2.1 How to operate the menu])

3 Press the [ ] key.
4 To display the water temp graph, select the

[ON].
To stop the display of water temp graph,
select the [OFF]. (Press the [

] key or [ ]

key)

5 Press the [MENU] key to close the menu.

CVS-128 Chapter 3 How to use the menu2

0093112802-01 3-1

Chapter 3 How to use the menu2

3.1 Display of Menu

After powering on, besides the menu displayed
first with the [MENU] key, the system menu, of
which setting is not frequently changed, is
provided.

[In out], [Correct], [Setting], [Maintain]

Display the menu

1 Press the [MENU] key.
2 Select the [Next].

3 Press [ ] key to display the system menu.

Return to the normal menu

1 Select the [Prev].
2 Press the [ ] key to display the normal

menu.

3.2 Setting of External Input /
Output

Set the setting related to the input/output.

Buzzer Setting

Set the buzzer sound to ON/OFF.

Temp Source

Switch the Sensor/NMEA.
For setting of [SENSOR], use an internal water

thermometer connected to the water temperature
sensor with J6 connector.

For setting of [NMEA], use the input value from
outside connected with NMEA of power
connector.

Speed Source

Switch the Sensor/NMEA.
Use the built-in speed meter for sensor.
Use the external input value for NMEA.

Baud Rate

Change the transmission speed of external
input/output.

Match the transmission speed with that of
external equipment connected. (Setting: 4800,
9600, 19200, 38400)

Correct

In out

Setting
Maintain

Buzzer setting
Temp source
Speed source
Baud rate
NMEA monitor

OFF
InsideSensor
InsideSensor
4800
OFF

NMEA output data

Return

NMEA output data

Correct

In out
Setting

Maintain

A

djust

D.range
Disp

A

larm1

A

larm2

NAV
Image

Sonar
System

Disp

D.range

A

larm1

A

larm2
NAV
Image
Sonar
System

In out
Correct
Setting
Maintain

Next

A

djust

Prev

Prev

Chapter 3 How to use the menu2 CVS-128

3-2 0093112802-01

NMEA Monitor

The external input data can be displayed.
To return to the original menu, press the [MENU]

key.

Caution: When [GAIN (HF) Knob] is

pressed, the displayed data will stop.

NMEA Output Data

The output of NMEA sentence can be set to
ON/OFF.

1 Select [In out] → [NMEA output data]. (See

[2.1 How to operate the menu].)

2 Press the [ ] key.
3 Select the sentence name.

4 Press the [ ] key.

5 Select the ON/OFF.

6 Press the [ ] key to turn to the display to

select the sentence name.

7 Further pressing of [ ] key turns to the

display to select the NMEA output.

8 Press the [MENU] key to close the menu.

3.3 Setting of Correct Item

Draft Set

The tolerance of depth can be corrected.
Set the depth from the sea level to the set depth

of your transceiver/receiver . Normally set draft
value of your boat. (Setting: expect ft: - 10.0 to

10.0, ft: -30.0 to 30.0)

Sonic Speed

Set the [Seawater] or [Freshwater].
Change to meet the usage.

Water Temp

The error of water temp value can be corrected.
(Setting: - 10.0 to 10.0 ˚C, - 10 to 10 ˚F)

Boat Speed

The tolerance of boat speed value can be
corrected.

When the [Speed source] is set to the [Sensor], it
is corrected by %. (Setting: - 50 to 50 %)

When the [Speed source] is set to the [NMEA], it
is corrected by numeral. (Setting: - 10.0 to 10.0)

Beam width High / Beam width Low

Beam width of transeducer which you use is set
for high and low frequency respectively.

Correct

In out
Setting

Maintain

Prev
DBT
DPT
GGA
MTW

OFF

TLL

VTG

VHW

Return

ZDA

OFF

OFF

OFF

OFF

ON
ON

ON

Correct

In out
Setting

Maintain

Draft set
Sonic speed
Water temp
Boat speed

Return

Seawater

0.0m

0.0℃
0%

Beam width H
Beam width L

17°
50°

Prev

Prev

DBT

OFF

ON

CVS-128 Chapter 3 How to use the menu2

0093112802-01 3-3

3.4 Setting of Basic Set Item

Language

Switch to the language to be displayed.

Caution:［Language］ is displayed in red

characters.

Range & Speed Unit

It switches the display unit to [nm, kt] or [km,
km/h].

Depth Unit

It switches the unit of depth to fm, l.fm and ft.

Temperature Unit

It switches the unit of temperature to ˚C, °F.

Local time Offset

The local time offset can be set by 0.5 hours (30
minutes) unit. (Setting: - 11.0 to 14.0 h) (UTC: 0.0)

GPS select

It selects whether the GPS sensor is the KODEN
made one or not.

Caution: Only when connecting the

Koden GPS sensor to the equipment
directly, select [KODEN GPS].
When connecting the GPS sensor
(even Koden one) via Plotter etc to
the equipment, select [Other].

GPS initialize

It is valid only when KODEN GPS is connected.
The GPS sensor is initialized.

Caution: When connecting the GPS

sensor other than KODEN GPS, do
not use this item.

Correct

In out
Setting

Maintain

Range&Speed unit

Depth unit
Temperature unit
Localtime offset
GPS select
GPS initialize

Return

m

NM,kn

℃

0.0

.

Others
No

English

Language

Prev

Chapter 3 How to use the menu2 CVS-128

3-4 0093112802-01

3.5 Maintenance Menu

Simulation

When the [Simulation] is set to ON, the pseudo
image of echo sounder is displayed.

Slide show

The slide show of the images stored in [Image]→
[Image recall] is available. The time intervals for
image changeover can be selected from 15
seconds and 30 seconds.

Caution: To perform slide show,

registration in the list of image memory
is required. When it is not registered,
slide show cannot be selected.

Initialize

It returns all the settings in the menu to the
factory settings. However, the memo rized data of
display remains unchanged.

Caution: It returns to the factory settings

and the power is automatically shut
down.

System Check

It is used for diagnostic test.
(See [4.5 Dia

gnostic Test])

All WPTs deletes

All WPT lists can be deleted.

All stored image deletes

All stored image lists can be deleted.

Prev
Correct

In out
Setting

Maintain

Simulation
Initialize

System check

Return

No

OFF

A

ll WPTs:DLT

A

ll IMG DT:DLT

Slideshow

OFF

CVS-128 Chapter 4 Maintenance and Inspection

0093112802-01 4-1

Chapter 4 Maintenance and Inspection

4.1 Inspection

The daily maintenance and inspection extends the life of equipment. To always keep the equipment in
the best condition, implement periodically the inspection shown in the table below.

Item Content of Inspection

Connector at the rear of
CVS-128 Display unit

Check the looseness.

Wiring of cables Check the wiring of cables connecting the equipment and the

damage of cable.

Grounding of display unit Scrape the rust off the ground terminal and make its contact well.

4.2 Cleaning

CVS-128 Display unit

Contamination on the screen may cause faint images. For cleaning the screen, wipe the screen with
soft and clean cloth dipped with diluted neutral detergent. Pay full attention as the screen is easily
getting scratched. No thinner shall be used.

For cleaning the housing, do not use plastic solvent such as thinner or alcohol. Painting on the surface
and characters at the operating portion may melt. After wiping with soft and clean cloth dipped with
diluted neutral detergent, wipe away with dry soft and clean cloth.

Transducer

In case of through-hull equipped transducer, check the surface of opening of transducer (portion form
which the ultra-sonic is emitted). If shells and oil are stuck, scrub the surface with a wooden o r bamboo
knife with caution not to damage the surface and remove stuck matters. If you scrub strongly, the
surface will be damaged, resulting in deteriorated performance of transducer.

Caution

The display unit has a special coating. Do not use a solvent such as
paint thinner, acetone, alcohol, and benzene, etc.
Strong rubbing may cause bruising, scratching.

Chapter 4 Maintenance and Inspection CVS-128

4-2 0093112802-01

4.3 Fuse Replacement

If the input voltage is too high, the over-current flows or a trouble occurs inside, the fuse will blow out.
The fuse is housed in the power cable.

4.4 If you suspect a trouble

Symptom Trouble cause Countermeasure

Even if the power is
powered on, nothing is
displayed.

• Blown fuse.

• The power voltage is out of

specification (10.8 to 31.2
VDC).

• Poor connection between
power cable and battery.

• Exchange a fuse.(See [4.3 Fuse
Replacement])

• Use a proper power as per
specification.

• Confirm a connection between the
power cable and the battery.

The unit starts up. But,
nothing is displayed on
the display.

• Connection between
transducer and display unit.

• Defect of LCD display block.

• Confirm a connection between

Transducer and Display unit.

• Consult a repair shop or the
distributor in your market.

Too much interference
and noise.

• Installed position of
transducer.

• Interference from the echo
sounder on other boat.

• Confirm the position of transducer.
(See [5.3 Installation of
Transducer])

• Apply the interference rejection.
(See [2.3 Rejection of
Interference])

The display of water
temperature / boat speed
is abnormal or not
displayed.

• Connection of sensor
connector.

• Input source of water
temperature sensor / speed
sensor.

• Confirm the connection of the sensor
connector.

• Confirm the input source.

The display of present
location/course is
abnormal or not
displayed.

• Connection between this unit
and navigation equipment.

• Confirm a connection between
Display unit and the navigation
equipment.

Warning

Use the specified fuse. If you use a fuse other than
specified one, it may lead to a serious accident.

CVS-128 Chapter 4 Maintenance and Inspection

0093112802-01 4-3

4.5 Diagnostic Test

Perform the operation diagnosis.
When checking the operation diagnosis of

panel key, the state of sensor inside and the
version of software, it is using.

Diagnose

① displays the diagnostic result.
The result of ROM and RAM check displays

OK when normal and NG when abnormal.

Caution: To test the NMEA, TEMP
and SPEED, the special checker is
necessary.

② implements the key input test. When
pressing the key, the color of a part
corresponding to the pressed key changes.

When pressing the [GAIN (HF)], the LCD test
is performed.

Confirm the version

③ displays the information on the version of
software.

When inquiring, inform us of ver XX.XXX.

Return to the menu

Press the [MENU] key for more than 3
seconds.

CVS-128 Chapter 5 Installation

0093112802-01 5-1

Chapter 5 Installation

5.1 Item of Caution on Installation

To exercise fully the performance of echo sounder, the installation of CVS-128 must be performed by
an engineer who is officially authorized by our comp any. The installation work includes the following
content.

(1) Unpacking the configuration items
(2) Inspection of configuration unit, spare, accessories and material for installation
(3) Check of power voltage and capacity of current
(4) Decision of installing location
(5) Installation of CVS-128 Display unit and transducer
(6) Installation of accessories
(7) Plan and execution of cable laying and connection
(8) Adjustment after completion of installation

Unpacking the configuration parts

Unpack the configuration items and confirm that all of the items match with the contents on the
equipment configuration list. If not matched, Contact the dealer you purchased or our sales co mpany.

Inspection of configuration items and accessories

Inspect the appearance of each configuration item and accessories and check that no dents or
damage exist.

If any dents or damage exists and they are believed to be caused by accident during transportation,
contact the transportation and insurance company and consult our sales company or our dealer
nearest to you.

Decision of Installing Location

To exercise fully the performance of equipment, install the equipment, considering the points
mentioned below.

(1) Install the equipment at the location in the bridge so that its display can be easily seen.
(2) Select a safe location where the equipment is not exposed to humidity, water splash, rain and

direct sunshine.

(3) Keep enough space for maintenance. Especially, secure enough space at the rear panel where

many cables are concentrated.

(4) Keep the equipment as far away from the wireless transmitter/receiver as possible.

The equipment is not waterproofed. Avoid excessively damp place. Do not
install the equipment in place suffering from excessive water-drops.
Otherwise, the corrosion may occur inside.

Chapter 5 Installation CVS-128

5-2 0093112802-01

Laying and Connection of Cable

(1) Keep the transducer and power cable as far away from the cables of other electronic equipment

as possible.

(2) The cabinet of CVS-128 Display unit is securely grounded to the hull, using the ground terminal on

the rear panel.

Caution: The ground side of power input of this equipment is connected to the ground

terminal.
In case of + (positive) ground, it cannot be used. The power may short-circuit.

(3) If you connect the power cable directly to the battery, the interferen ce from other electronic

equipment is not subject to occurrence. (See Fig. 5.1.)

Fig. 5.1 Connection of Power Line

Confirmation after Installation

Be sure to confirm the following items before starting up this e quipment. The confirmation is ma ndatory
to operate the equipment normally.

(1) Is the power voltage in the boat within the appropriate voltage range? Is the current capacity

enough?

Voltage Range: 10.8 to 31.2 VDC when measured at the power connector input.
(2) Is the electric current capacity sufficient? (Power consumption: 25 W)
(3) Is the wiring of transducer cable correct? Is the wiring shorted?

Good example

Bad example

CVS-128 Display unit

CVS-128 Display unit

Battery Battery

Noise

Noise

CVS-128 CVS-128

CVS-128 Chapter 5 Installation

0093112802-01 5-3

5.2 Installation of CVS-128 Display unit

CVS-128 Display unit can be desk-top installed or flush-mount installed.
Install in the following procedure.

Desk-top Installation

(1) Remove two knob bolts fixing the display unit to the bracket.
(2) Remove the display unit from the bracket and place it on the stable flat place.
(3) Place the bracket on the position where the display unit will be installed and fix the bracket with five

5 mm screws.

(4) Place the display unit on the installation bracket and fix the display unit with two knob bolts

removed in step 1.

Display unit

Installation bracket

Knob bolts

Unit: mm (inch)

4

1

4

1

(

1

3

9

/

6

4

)

(

1

3

9

/

6

4

)

1

2

5

1

2

5

(4

5

9

/

6

4

)

(

4

5

9

/

6

4

)

Fig. 5.2 Desk-top installation

Chapter 5 Installation CVS-128

5-4 0093112802-01

Caution: When installing on the desktop, the maintenance space shown in the illustration

below is required for cable lay-out, plugging-in/out of connector, fuse replacement and
bolt tightening.

Unit: mm (inch)

100

(3 15/16)

(3 15/16)(9 29/64))

240 100

Fig. 5.3 Maintenance space

CVS-128 Chapter 5 Installation

0093112802-01 5-5

Flush-mount Installation

(1) Make a square hole (220mm x 220mm) at the location to be installed. (See Fig. 5.5.)
(2) Turn counter-clockwise the knob bolt fixing the display unit to the mounting bracket to loosen it,

push the unit to the left side and pull the unit upward. The mounting bracket and knob bolt are no

longer used.
(3) Confirm that the unit matches with the square holes. If not matched, correct the square hole.
(4) Remove the front frame of the display unit, pulling it toward you. (See Fig. 5.4.)
(5) Connect the connectors for power and transducer to the unit respectively.
(6) Install the display unit in the installing location (square hole) and fix it with four tapping screws

(4mm) (M4 or pan-head). (Prepare 4mm screws suitable for thickness of installing location.)
(7) Install the front frame removed in step (4).

Unit: mm (inch)

4-4mm (4-5/32)
Hole for screw

Threading

hole

R25 (63/

64)

220

(8 21/32)

(8 13/16)

224

Fig. 5.4 Flush-mount Instsllation

Fig. 5.5 Work of fiush-mount instsllation hole

Threading hole

Unit:mm (inch)

2

2

0

(

8

2

1

/

3

2

)

Chapter 5 Installation CVS-128

5-6 0093112802-01

5.3 Installation of Transducer

The standard installation of this echo sounder is sho wn in figure 5.6.

Figure 5.6 Installation of Tr ansducer

In case of Inner-hull

Using the optional inner-hull kit (MFB-04), install the transducer to the inner side of ship’s bottom.

Caution on installation

(1) Select the location where no bubble is
generated during navigation.

(2) Select the relatively thin location of ship’s
bottom.

(3) Be sure to remove oil on the contact
surface. File the contact surface with sand
paper (#400) so that the adhesive strength will
increase.

(4) The adhered surface will dry in about two
hours.

(5) Leave the unit for a whole day and fill in
the coolant. More than 80 % of the transducer
should be submerged in the coolant.

Caution: Confirm a place of the installation of inner-hull in the manufacturer of the ship

and so on. The inner-hull device is for more effective performance method. The gain
falls in comparison with the through-hull performance dramatically. Low frequency (50
kHz) may not be used due to large signal attenuation. Depth range performance using
200 kHz Transducer in case of inner -h ull will also be less about 50% than that of
through-hull.

Caution: In the case of fishing boats, FRP contained air bubbles and foarmed materials

that would prevent ultrasound from penetration have been likely used. Therefore, even
locations that are convenient for installation may be locations where attenuation of
ultrasound is not low enough.

Figure 5.7 Inner-Hull installation

CVS-128 Chapter 5 Installation

0093112802-01 5-7

In case of through hull

Install the transducer directly to the ship’s bottom

Installation Procedure

(1) Select the installing location.
(2) Remove the fixing nut and one piece of rubber packing.
(3) If the slope of ship’s bottom is greater than 5°, make a wooden base to fit to the slope of ship’s

bottom. To reduce the water resistance, cut the bow direction tip of wooden base at the outer side

of ship’s bottom in the triangle shape.
(4) Make holes at the installing location. If the wooden base is used, make holes in the wooden base.
(5) Thread the rubber packing in the transducer and then the cable.
(6) To prevent water from seeping through the gap between the transducer and the hole, fill out the

gap with FRP or silicon glue. (Glue the wooden base likewise.)
(7) Thread the rubber packing and fix it with the fixing nut firmly.
(8) Connect the transducer cable to the connector of CVS-128 Display unit.

Figure 5.8 Through-hull Installation

In case that the slope of ship , s bottom is less than 5

Fixing nut

Fixing nut

Rubber packing

Rubber packing

Rubber packing

Rubber packing

Less than 5

Transduce

r

Transduce

r

Ship,s bottom

Ship

,

s bottom

In case that the slope of ship , s bottom is greater than 5

Wooden base

Wooden base

Chapter 5 Installation CVS-128

5-8 0093112802-01

5.4 Wiring

Connection of Cable to CVS-128 Display unit

Connect the power cable and transducer to the connectors of CVS-128 Display unit.

Pin Assignment of Rear Connector

Pin assignment viewed from the rear of CVS-128 Display unit.

Power input

10.8~31.2VDC

NMEA data input output

GPS, plotter etc

Sona-tone output
Line output for speaker with amplifie

r

Power output
For power of GPS etc

Transduce

r

For 50/200kHz in common
Speed sensor data input
Water temperature sensor data input

External monitor

Analog RGB

Sona-tone R

Sona-tone L
Power +
GND
N ME A T X-
N ME A T

X+

N ME A R

X+

N ME A R

X-

Power ­Shield
Sona-tone COM
Outside power

Speed sensor input
Speed sensor powe

r

Transducer input output
Transducer shield
Transducer input output
Water temperature sensor powe

r

Water temperature sensor input
Speed sensor GND

J6

R

R-GND
G
G-GND
B
B-GND
H-SYNC
V-SYNC
Un-connected

J7

Un-connected

POWER

CVS-128 Chapter 5 Installation

0093112802-01 5-9

Connection of Power Cable

Connect the power cable to the [POWER] connector and the transducer to the [J6] at the rear of
CVS-128 Display unit connector.

Connection of DC power cable (CW-264A-2M)

To [POWER] connector

3.5 stereo jack

DC+ (Red)
DC- (Black)

Caution: Wind the insulation tape around the un-used lead wire for core-wires not to contact

each other.

Grounding

• Use heavy gauge cable for grounding wire.

• Connect the grounding wire to the grounding material in a short distance.

• When connecting the external equipment of which positive polarity is connected to the ground line,

do not connect the ground of signal line to the cabinet ground.

Chapter 5 Installation CVS-128

5-10 0093112802-01

Connection of Transducer

At the end to the transmission/receiving cable for TD-500T -2B, TD-500T-3B and TD-501T-3B, a water
proof connector with 8-core is provided.

At the end to the transducer for TD-501C is plain.

1) TD-500T-2B/500T-3B/501T-3B

Connect to the J6 connector on the back of the receiver display unit.

2) TD-501-C

The user must have the cable, CW-840-0.3M (option)for the transducer.

Solder the transducer to CW-840-0.3M while referring to the table on connecting transducers.
After soldering is completed, please be sure to add water-resistance and in sulation by applying

electrical tape (or other such tape) onto the soldered part of the cable.

Transducer Connection Table

Transducer Cable Transducer

2 lead shield wire number 2 lead shield wire color TD-501C

3 orange black
4 shield shield
5 white white

CW-840-0.3M

2 lead shield

3 TD1 (orange)

5 TD2 (white)

4

Shield

To Transducer

1 SPD.PULSE (blue)
2 SPD.VCC (purple)

8 SPD.GND (black)

6 TEMP.VCC (green)
7 TEMP.SIG (red)

To Speed Sensor

To Temperature Sensor

Lead wires

CVS-128 Chapter 5 Installation

0093112802-01 5-11

Connection with external equipment

The DC power cable contains the connection cables for external equipment such as navigation
equipment and KODEN GPS sensor.

Color Pin Remark

Red ③ Power input+ (with 3A fuse)

Black ⑨ Power input- (with 3A fuse)

Orange ⑥ NMEA data output +

Blue ⑤ NMEA data output ­White ⑦ NMEA data input +
Green ⑧ NMEA data input -

Color Pin Remark

White ②

Red ①

Black ⑪

External speaker output
(with ø3.5 stereo jack)

Yellow ⑫ Outside power

Gray ④ GND

Shield ⑩

Connection with GPS-20A

After soldering, implement the waterproof and insulation treatment on the connected part with the
self-melting tape.

CVS-128

DC power cable

(CW-264A-2M)

GPS-20A（No Type）

Connecting up without using a

connector

GPS-20A（Type B）

Connecting up using a

connector*

Color Remark Color

Pin

Orange

NMEA data output +

Orange

②

Blue NMEA data output - Blue

③

White NMEA data input + White

④

Green NMEA data input - Green

⑤

Yellow Outside power Red

⑥

Gray GND Black

①

*Optional connector (LTWBD-06PMMP-LC) is necessary.

Chapter 5 Installation CVS-128

5-12 0093112802-01

Connection with Speed Sensor or Water Temperature Sensor (Option)

When installing the optional speed sensor or water temperature sensor, connect to the [J6] connector
together with the transducer via the transducer cable (T ype: CW-840-0.3M). For wiring, see the figure
below.

After soldering, implement the waterproof and insulation treatment on the connected part with the
self-melting tape.

Structure of Transducer Cable

Connection Table of Transducer

Transducer Cable Transducer

No. of 2 core shield Color of 2 core shield TD-500T-2B

TD-500T-3B

TD-501T-3B

TD-501C

3 Orange Red Black
4 Shield Shield Shield
5 White White White

Connection Table of Speed Sensor and Water Temperature Sensor

Transducer Cable Water Temperature Sensor / Speed Sensor

No, of lead

wire

Color of lead

wire

T-81 ST-80

ST-80-1

ST-90

ST-90-1

ST-100

ST-100-1
1 Blue — Green Green Green
2 Violet — Red Red Red
6 Green Gray White White White
7 Red Gray Brown Brown Brown
8 Black — Shield Shield Shield

2 core shield wire

TD1 (Orange)

TD2 (White)

Shield

SPD.PULSE (Blue)

SPD.VCC (Violet)

SPD.GND (Black)

TEMP.VCC (Green)

TEMP.SIG (Red)

lead wire

To the speed sensor

To the water temperature sensor

T o Transducer

CVS-128 Chapter 5 Installation

0093112802-01 5-13

Connection of External Speaker for Sone-Tone (Prepared by a customer)

The ø3.5 stereo jack is provided to the power cable.
If you connect the speaker with the amplifier to the external, you can clearly hear the sona -tone so und.
Adjust the volume of speaker with the amplifier equipped to the speaker

3.5 stereo jack

Connection of External Monitor (J7) (Prepared by a customer)

When installing an external monitor (VGA monitor, analog RGB input), connect it via CW-576-0.5M. For
its wiring, refer to the illustration below.
After soldering, perform the waterproof and insulation treatment on the junction with a self-fusion tape.

Structure of CW-576-0.5M

Nonuse

Chapter 5 Installation CVS-128

5-14 0093112802-01

5.5 Serial Data

Input Data

The sentences of GGA, GLL, HDT, MTV, MWV, RMC, VHW, VTG and ZDA can be received.
The type of NMEA0183 Ver.1.5, Ver.2.0 and Ver.3.0 can be inputted.

Information Priority Order of Sentence Information Priority Order of Sentence
Latitude,

Longitude

GGA > RMC > GLL Wind Direction MWV

Course VTG > RMC Wind Speed MWV
Haeding HDT Date ZDA > RMC
Ground Speed VTG > RMC Time ZDA > GGA
Water Speed VHW Water

Temperature

MTW

Output Data

The sentences of DBT, DPT , GGA, GLL, HDT, MTW, MWV,RMC, TLL, VHW, VTG and ZDA can be
transmitted.
The output is performed in the type of NMEA0183 Ver.2.0. However, the DBT is performed in Ver.1.5.

Sentence Information Sentence Information
DBT Depth MWV Wind Direction, Wind Speed
DPT Depth from the transducer RMC Latitude/Longitude, Course,

Ground Speed, Date
GGA Latitude/Longitude, Time TLL Target Position
GLL Latitude/Longitude VHW Water Speed
HDT Heading VTG Course, Ground Speed
MTW Water Temperature ZDA Date,Time

CVS-128 Chapter 6 Table Attached

0093112802-01 6-1

Chapter 6 Table Attached

6.1 Menu List

The factory set value is shown by the bold and underline.

【Disp】key

Disp

NAV1, Normal (H), Zoom (H), Dual freq

, Zoom (L), Normal (L), NAV2

【▲RANGE▼】key

RANGE

Auto range, 5.0, 10.0, 20.0, 50.0, 100, 160, 300, 500, Auto shift

【GAIN(HF)】,【GAIN(LF)】

Gain select

Manual, Cruising, Fishing

Auto adjust

- 10 to 10 (H): 0

, (L): 0

Gain

0.0 to 10.0 (H): 6.0, (L): 6.0

LCD

brill

1 to 10: 10

Panel brill

1 to 10: 10

【EVENT】key

Store pos, Store image, Fishing hot spot

【F1】key

Image speed, IR, Color rejection, Noise rejection, Shift, Zoom range,

Zoom start, A scope, White line, Background color, Disp width,

NAV start, NAV1, NAV2, Image swap, Image recall, Sona-tone

【F2】key

Image speed, IR, Color rejection, Noise rejection, Shift, Zoom range,

Zoom start, A scope, White line, Background color, Disp width,

NAV start, NAV1, NAV2, Image swap, Image recall, Sona-tone

【BRILL】key

Chapter 6 Table Attached CVS-128

6-2 0093112802-01

【MENU】key

Adjust

Image speed (2/1, 1/1

, Stop, 1/1.5, 1/2, 1/2.5, 1/3, 1/3.5, 1/4, 1/4.5)

IR (OFF, Weak, Strong)
Color rejection (0 to 50 ％: 0％)
Noise rejection (0 to 10: 0)
TVG (Weak, Medium, Strong)
TX power (20, 30, 40, 50, 60, 70, 80, 90, 100, Auto)
Gain (TD) (-50 to 50: H: 0, L: 0)

Shift (0 to 300m: 0m

)

Zoom type (Bottom, Bottom Discrimination, Zoom, Bottom Zoom, Bottom Follow Zoom)
Zoom range (2.5 to 200 m: 10.0 m)
Zoom start (0 to 800 m: 0m)
Disp width (Left2, Left1, Center, Right1, Right2)

D.range

Range １ (2.5 to 1200 m: 5.0)
Range 2 (2.5 to 1200 m: 10.0

)

Range 3 (2.5 to 1200 m: 20.0

)

Range 4 (2.5 to 1200 m: 50.0

)

Range 5 (2.5 to 1200 m: 100

)

Range 6 (2.5 to 1200 m: 160

)

Range 7 (2.5 to 1200 m: 300

)

Range 8 (2.5 to 1200 m: 500

)

Range preset

A scope (OFF

, ON)

White line (OFF, 1, 2, 3, 4, 5, Auto)
Background color (Pale blue, Marine blue, Blue, Dark blue, Black, Darkkhaki,

Mediumseagreen, Light grey, White, Night mode)

Color tone (Monochrome, 8 color, 16 color, 64 color )
Depth value (Small, Large, Detection range)

Disp

Water temp graph (OFF, ON)
Fish symbol (OFF, Symbol 1 to Symbol 10)

Symbol info (OFF, Depth, Size)

Bottom alarm (OFF, ON)

Upper depth (0 to 800 m: 5 m)
Lower depth (1 to 800 m: 50 m)

Fish alarm (OFF, ON)

Position (0 to 800 m: 5 m)

Alarm 1

Range (1 to 800 m: 50 m)
Level (Weak, Medium, Strong)

A

CVS-128 Chapter 6 Table Attached

0093112802-01 6-3

Water temp alarm (OFF

, ON (Inside), ON (Outside))

Upper temp alarm (- 5 to 45.0 ℃: 20.0 ℃)
Lower temp alarm (- 5 to 45.0 ℃: 15.0 ℃)

Speed alarm (OFF, ON (Upper), ON (Lower))

Speed limit (0 to 80 kn: 0 kn)

Alarm 2

Arrival alarm (OFF, ON)
XTE alarm (OFF, ON)
NAV alarm range (5 to 999 m: 10 m)

NAV start (No.1 to No.10)

NAV cancel (Yes, No)

WPT edit (No.1 to No.10)

WPT delete (No.1 to No.10)

Background color (OFF, White, Black)

NAV

NAV 1 (Normal (H), Zoom (H), Dual freq, Zoom (L), Normal (L))
NAV 2 (Normal (H), Zoom (H), Dual freq, Zoom (L), Normal (L))

A

Image swap (A|B, B|A)

Image recall (No.1 to No.10)

Image comment (No.1 to No.10)

Image delete (No.1 to No.10)

Image

Sona-tone (OFF

, ON)

Sona

r

EVENT key set (Store pos, Store image, Fishing hot spot)

F1 key set (Image speed, IR, Color rejection, Noise rejection, Shift, Zoom range,

Zoom start, A scope, White line, Background color, Disp width,

NAV start, NAV 1, NAV 2, Image swap, Image recall, Sona-ton)

Operation guide (OFF, ON)

System

F2 key set (Image speed, IR, Color rejection, Noise rejection, Shift, Zoom range,

Zoom start, A scope, White line, Background color, Disp width,

NAV start, NAV 1, NAV 2, Image swap, Image recall, Sona-tone)

Buzzer setting (OFF, ON)
Temp source: (InsideSensor, NMEA)
Speed source (InsideSensor, NMEA)
Baud rate (4800, 9600, 19200, 38400)

In out

NMEA monitor (OFF, ON)

NMEA output data (ON：DBT, DPT, TLL OFF：GGA, MTW, VHW, VTG, ZDA)

NMEA output data（ON：None OFF：GLL, HDT, MWV, RMC）

Draft set (- 10.0 to 10.0 m: 0.0 m)
Sonic speed (Seawater, Freshwater)
Water temp (- 10.0 to 10.0 ℃: 0.0 ℃)

Boat speed (- 50.0 to 50.0 %: 0 ％)

Correct

B

Beam width High (1 to 120: 17)
Beam width Low (1 to 120: 50

)

Chapter 6 Table Attached CVS-128

6-4 0093112802-01

Language (English, Japanese, etc)

Range&Speed unit (NM，kn, km, km/h)
Depth unit (m, fm, I.fm, ft)
Temperature unit (℃, °F)
Localtime offset (- 11.0 to 14.0: 0.0)
GPS select (Others, KODEN GPS)

Setting

GPS initialize (No, Yes)

B

Simulation (OFF, ON)

Initialize (No, Yes)

System check

All WPTs:DLT (No, Yes)
All IMG DT: DLT (No, Yes)

Maintain

Slideshow (OFF, 15, 30)

CVS-128 Chapter 6 Table Attached

0093112802-01 6-5

6.2 Specification

Item Content

Model CVS-128

Transmission
Frequency

50 kHz/200 kHz

Transmission
Method

Single or alternate

Transmission
Power

600 W/1 kW

Transmission
Firing Times

5000 times/minute at maximum

Transmission
Pulse Width

50 µs to 3.0 ms

Overall

Minimal
Reception Gain

0 dBµV

Display 8.4 inch color TFT LCD VGA (640 x 480)

Display Mode Normal, Dual frequency, Zoom, NAV (Simple plotter, compass), A scope

Zoom Mode Bottom, bottom discrimination, zoom, bottom zoom, bottom follow zoom

Range 2.5 m to 1200 m (It can be set at arbitrary 8 locations.)

Range Unit m, fm, l.fm, ft

Shift Amount 0 to 300 m (Maximum depth 1500 m using Shift)

Zoom Range 2.5 m to 200 m

Image Speed 10 stages (2/1, 1/1, stop, 1/1.5, 1/2, 1/2.5, 1/3, 1/3.5, 1/4, 1/4.5)

Function
Registration

Image speed, range method, shift, interference rejection, color rejection,
noise rejection, zoom range, zoom depth, white line, background color etc

Display unit

Color tone Monochrome, 8 color, 16 color, 64 color

Type NMEA0183 Ver.1.5/2.0/3.0 Input Data

GGA, GLL, HDT, MTW, MWV, RMC, VHW, VTG, ZDA

Type NMEA0183 Ver.2.0 (DBT only Ver.1.5)

Serial

Data

Output Data

DBT, DPT, GGA, GLL, HDT, MTW, MWV, RMC, TLL, VHW, VTG, ZDA

Power supply
Power consumption

10.8 to 31.2 V DC
25 W

Range of
Operating
Temperature

- 15 °C to + 55 °C

Store
Temperature

- 30 °C to + 70 °C

Upper limit of
humidity

93 % ± 3 % (At + 40 °C)

Water
protection

IPX5

Vibration
Resistant

When the following vibration is applied to equipment respectively under
specified condition, its performance should not be affected.

• From 2 to 5 Hz up to 13.2 Hz vibration width ± 1 mm ± 10% (Maximum
acceleration 7 m/s

2

constant at 13.2 Hz)

• From 13.2 Hz up to 100 Hz Maximum acceleration 7 m/s

2

constant

Size of Cabinet Maximum 274 x 263 x 133 mm (Unit 240 x 240 x 112 mm)

Environment Condition

Weight 3.2 kg

Chapter 6 Table Attached CVS-128

6-6 0093112802-01

6.3 Appearance

Plane view

CVS-128 Chapter 6 Table Attached

0093112802-01 6-7

Maintenance Space

Unit: mm (inch)

100

(3 15/16) (3 15/16)(9 29/64))

240 100

Dimension drawing of table installation

240

(9 29/64)

(8 21/32)

220

224

Unit: mm (inch)

(8 5/32)

Hole for installing
4-4mm screw

R2

5

(

6

3

/

6

4

)

Threading hole

Dimension drawing of flush-mount installation