Koden CVS-126 User manual

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-126 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
EN 60945: 2002 ( Clauses 9,10 & 12 )
Signed
Heinz Hoghoff,
Dated 10 Jun. 2008
Koden Elektronik GmbH.
Am Gewerbepark 15
D-64823, Gross–Umstadt
Germany.
Phone [phone]
Telefax+49 6078 73824
N.B. As this product is for Maritime use compliance with Directive 72/23/EEC is not required.

CVS-126 Revision History
0093132702-08 i
CVS-126 Operation Manual
Doc No. 0093132702
Document Revision History
No. Doc. No-Rev. No. Reviced Date
(Y/M/D)
Revised Content
0 0093132702-00 2008/04/09 First edition
1 0093132702-01 2008/05/25 Chapter all
2 0093132702-02 2008/07/18 vii,x,xi,1-2,1-3,1-9,1-11,2-3,2-4,2-5,2-13,3-2,5-5,5-10,6-1
3 0093132702-03 2010/03/03 Revision (From software KM-E67 Ver02.00 to Ver02.**)
4 0093132702-04 2010/11/12 Revision (From software KM-E67 Ver02.01 to Ver02.**)
Chapter 5
5 0093132702-05 2011/04/08 Wording
6 0093132702-06 2011/12/15 Important Notice, Configuration of Equipment,
Chapter 1, Chapter 2, Chapter 3, Chapter 6
7 0093132702-07 2012/07/04 Chapter 2, Chapter 6
8 0093132702-08 2013/08/09 System Configuration, Configuration of Equipment
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.
© 2008-2013 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.
**Subject to version change

Important Notice CVS-126
ii 0093132702-08
Important Notice
For copy and transcription of this Operation Manual (hereinafter referred to as this manual),
permission from Koden is needed. Koden prohibits the un-authorized copy and transcription of this
manual.
If this manual is lost or damaged, consult a dealer of Koden or Koden.
The specification of the products and the contents in this manual are subject to change without
notice.
The contents displayed on the menu of product may be different from the expression of this
manual. The fonts and shapes of the keys and menus in the illustration may differ from the actual
ones, and some parts may be omitted.
Koden is not liable for damages and troubles arisen from misunderstanding of the contents in this
manual.
Koden is not liable for any damages caused by earthquake, lightning, wind and flood damage and
fire for which Koden is not responsible, and actions by third parties, other accidents, customer’s
unintended error/abuse and the use under other abnormal conditions.
Koden is not liable for damages of accompaniment (change/loss of memorized content, loss of
business profit, stop of business) arisen from use or failure of our products.
If the stored data are changed or lost, irrespective of causes of troubles and damages, Koden is
not liable for them.
Koden is not liable for any damages arisen from malfunction caused by combination of software
and connected equipment in which Koden is not engaged.

CVS-126 For Your Safe Operation
0093132702-08 iii
For Your Safe Operation
Pictorial used in this Operation 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 causeA 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-126
iv 0093132702-08
Caution on location of equipment
Do not install the equipment where it is excessively damp and suffers 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 board, 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 of 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 an 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-126 Contents
0093132702-08 v
Contents
Document Revision History.......................i
Important Notice.......................................ii
For Your Safe Operation .........................iii
Contents...................................................v
Introduction................................................ix
System Configuration .................................x
Configuration of Equipment.......................xi
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-126
Display unit ................................1-2
The clean of CVS-126
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 BrillianceAdjustment.........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 Selection of NAV Display...........1-8
Type of NAV Display..................1-8
Selection of NAV Menu..............1-8
1.6 Switch-over of Range ................1-9
Setting the range switching to auto
range..........................................1-9
Setting the range switching to
Manual range.............................1-9
1.7 Setting of Shift............................1-9
Setting of Manual Shift...............1-9
Release of manual Shift...........1-10
Setting of Auto Shift .................1-10
1.8 Gain Adjustment.......................1-10
Basic Operation of Gain........... 1-11
Selecting the auto gain............ 1-11
Adjusting the gain by auto ....... 1-11
Selecting the manual gain ....... 1-11
Manual adjustment of the gain. 1-11
1.9 Use of [EVENT] key.................1-12
Selecting the event
key function..............................1-12
Presetting the waypoint ...........1-12
Store the image........................1-13
Fishing hot spot........................1-13
1.10 Use of [FUNC] key...................1-14
Selecting the [FUNC] key ........1-14
Preset of [FUNC] key...............1-14
1.11 Operation of VRM....................1-15
1.12 Display of fish information........1-15
Display the fish symbol / stop the
display of fish symbol...............1-16
Selecting the symbol info.........1-16
Fish symbol detection
adjustment ...............................1-16
Size adjustment .......................1-16
Big fish / Big fish color .............1-17
Points to note in use of fish
symbol......................................1-17
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

Contents CVS-126
vi 0093132702-08
Menu Operation .........................2-1
2.2 Changing of Image Speed..........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 step....................2-3
2.7 Selection of Zoom......................2-3
2.8 Setting of Zoom Range..............2-4
2.9 Setting of Zoom Start .................2-4
2.10 Preset of Range.........................2-4
Easy registration method of
the range....................................2-5
2.11 Setting of Background Color......2-5
2.12 Setting of White Line..................2-5
2.13 Setting ofAlarm..........................2-6
Stopping the alarm sound ..........2-6
Setting the alarm........................2-7
Release the alarm......................2-7
Confirm the alarm state..............2-7
2.14 Preset/ WPT edit/ WPT delete of
Waypoint....................................2-8
NAV Start....................................2-8
Cancel the NAV..........................2-8
Edit the destination.....................2-8
Delete the waypoint....................2-9
Recall the stored image and
preset it as a destination............2-9
2.15 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
2.16 Explanation of Sonar................2-12
Switch-over of Sona-ToneTM.....2-12
Connection of External
Speaker....................................2-12
2.17 Explanation of Menu Item ........2-12
Inner-hull..................................2-12
TVG..........................................2-13
Change the TX power..............2-13
Display Width ...........................2-13
Display the A scope / Stop the
display of A scope ....................2-13
Change the display color of echo
sounder image .........................2-14
Change the depth value...........2-14
Display the water temp graph /
Stop the display of water temp
graph........................................2-14
Setting of the background color of
NAV display..............................2-14
Setting of the echo sounder
display at NAV display..............2-14
Image Swap.............................2-14
Display the Operation guide /
Stop the display of Operation
guide.........................................2-15
Display the detection area /
Stop the display of detection
area..........................................2-15
Setting of Depth measurement 2-15
Change the display color..........2-15
Change the scale type .............2-15
Change the bottom color..........2-15
Change the image partition......2-16
Selectiong a display area of fish
symbol indication......................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

CVS-126 Contents
0093132702-08 vii
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 Correction Item..........3-2
Draft Set.....................................3-2
Sonic Speed...............................3-2
Water Temp................................3-2
Boat Speed ................................3-2
Beam angle (Low/High).............3-2
Bubble time set..........................3-3
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
Local time Offset........................3-3
GPS select.................................3-3
GPS initialize..............................3-3
Sounding....................................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
Bottom start................................3-4
Inner-hull....................................3-4
Universal display setting
( ) .............................3-4
Chapter 4 Maintenance and Inspection...4-1
4.1 Inspection...................................4-1
4.2 Cleaning.....................................4-1
CVS-126 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 Items of Caution on Installation .5-1
Unpacking the components .......5-1
Inspection of components 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-126
Display unit................................5-2
Desk-top Installation ..................5-3
Flush-mount Installation.............5-3
5.3 Installation of Transducer...........5-5
In case of Inner-hull ...................5-5
In case of Through-hull..............5-6
5.4 Wiring.........................................5-7
Connection of Cable to CVS-126
Display unit ................................5-7
Pin Assignment of Rear
Connector ..................................5-7
Connection of Power Cable
and Transducer..........................5-8
Connection with external
equipment..................................5-9
Connection with GPS-20A.........5-9
Connection with Speed Sensor or
Water Temperature Sensor
(Option)....................................5-10
Connection of External Speaker
for Sona-ToneTM

Contents CVS-126
viii 0093132702-08
(Prepared by a customer) ........5-11
5.5 Serial Data................................5-11
Input Data.................................5-11
Output Data..............................5-11
Chapter 6 Table Attached........................ 6-1
6.1 Menu List....................................6-1
6.2 Specification...............................6-5
6.3 Appearance................................6-6

CVS-126 Introduction
0093132702-08 ix
Introduction
The CVS-126 is a Dual frequency (50kHz/200kHz) 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 5.7 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-ToneTM (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 homing function, that directs
your boat to navigate easily to the location desired, is available by marking the event mark when
recalling the stored image.
The unit is designed to save power consumption. The white LED is adopted for illuminating the LCD
and the power consumption is minimal in this class. The unit emits less heat and the occurrence of
condensation is rare.
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.

System Configuration CVS-126
x 0093132702-08
System Configuration
Connection Diagram
CW-264A-2M
CVS-126 echo sounder unit
With mounting bracket and hard cover
External power output (For GPS etc)
External speaker (For speaker with amplifier)
NMEA circuit input output
10.8 to 31.2VDC
Option cable (CW-840-0.3M)
Connection to the Transducer
Connection to the water temperature sensor
Connection to the speed sensor
Transducer TD-500T-3B (Dual frequency combination type 50/200kHz)
Bronze made. Equipped with Through-hull
Transducer TD-500T-2B (Dual frequency combination type 50/200kHz)
Plastic made. Equipped with Inner-hull
Note: To use the water temperature sensor / speed sensor,
the wiring of transducer connector has to be changed.
To Transducer
To POWER connector
Red
Black
Water temperature sensor
/ speed sensor
ST/80/90/100
connector
(TD connector)
Legend
Standard configuration
Option
+
-
External navigation equipment,
external water temperature mete
r
Owner supply
Transducer P66 (Dual frequency combination type 50 / 200 kHz)
Plastic made. Equipped with Transom. (Owner supply)

CVS-126 Configuration of Equipment
0093132702-08 xi
Configuration of Equipment
Standard Equipment Configuration List
No Name of item Type Remark Weight/
Length Quantity
1 Display unit
CVS-126 600W output
with mounting bracket
and knob
1.3 kg 1
2 Hard cover
C38MB12020 0.15kg 1
3 DC power cable
(Combind cable)
CW-264A-2M With 12 connector at
one end/ un-treated at
the other end
2m 1
4 Fuse
F-7161-3A
Cylinder (ø6.4x30) Normal fusion type for main power 2
5 Trans Tapping Screw
TPT5 x 20U For fixing CVS-126
Display unit 4
6 Cap
LTWCAP-DABCFXC1 For transducer cable
connector 1
7 Operation Manual CVS-126.OM.E English 1
8 Quick Reference CVS-126.QR.E English 1
9 Cautionary Note CVS-SER.RM.E English 1

Configuration of Equipment CVS-126
xii 0093132702-08
Essential Option
No Name of item Type Remark Weight/
Length Quantity
1 Transducer Type of transducer transducer cable (with
connector at one end) 9m 1
Type of transducer
No Specification Frequency Material /
Length of
the cable
Mounting method
Note
Beam width
(Right and left x back
and forth)
1 TD-500T-2B
50/200 kHz
600 W Plastic
9m
Inner-hull 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)
AIRMAR’s Transducer model P66 is also applicable. (Owner supply)
1
P66
50/200 kHz
600 W Plastic
10m
Transom
With water
temperature sensor
and speed sensor.
(The CW-840-0.3M is
needed)
50kHz
69°x69° ( -6dB)
200kHz
16°x16° ( -6dB)
Option List
No Name of Item Specification Remark Weight/Length
1 Water temperature
sensor / speed
sensor
ST-80 For transom mounting
Plastic made (with cable) 0.3kg/ 8m
ST-90 For Through-hull mounting
Plastic made (with cable) 0.6kg/ 8m
ST-100 For Through-hull mounting
Bronze made (with cable) 1.2kg/ 8m
2 GPS sensor GPS-20A-10M-B
[KODEN] For GPS measuring (With power & signal cable) 0.25kg/10m
3 Inner-hull kit MFB-04 Plastic made for installing the
transducer TD-500T-2B 1.3kg
4 Cable for transducer CW-840-0.3M Needed when using the
optional water temperature
sensor / speed sensor.
30cm
5 Connector for GPS
sensor LTWBD-06PMMP-LC Needed when using the GPS-20A (Type B) sensor.
Caution: For Inner-hull installation, an Inner-hull kit is necessary.

CVS-126 Chapter 1 Basic Operation
0093132702-08 1-1
Chapter 1 Basic Operation
1.1 How to use the key CVS-126 Display unit
Various setting can be done directly. The menu list closes automatically after the key operation of the
other keys than [menu].
No. Key Name Explanation
1 [DISP] It switches to the High frequency or Low frequency of echo sounder image, zoom
and navigation menu.
2 [EVENT] It notifies the external equipment of the present position. It presets the menu. It
begins a homing.
3 [Cursor]
It selects the menu item.
It changes the set value.
It moves the VRM marker.
It moves the marker for notifying the event.
4 [FUNC] It recalls directly the item preset.
5 [MENU] It opens or closes the menu.
6 [ RANGE ] It changes the range setting.
7 [Knob]
Press: It recalls the gain adjustment.
Rotate: It changes the gain value.
It selects the item in the menu.
8 [BRILL ]/ Power Press: Power on. It adjusts the brilliance and brightness of panel.
Long-press: Power off.
1
2
3
5
4
6
7
8

Chapter 1 Basic Operation CVS-126
1-2 0093132702-08
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-126 Display unit
To prevent dust from entering, cap the connector at the rear of CVS-126 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-126 Display unit
The cleaning of the display unit goes after removing the front-frame. After removing the front-frame, 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-126 Chapter 1 Basic Operation
0093132702-08 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 internal 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, the [Language] menu is
displayed.
Select the language with [ ]key or [ ]key.
(The language can be selected by rotating the
[Knob].)
3 When the installation of a transducer is
[Inner-hull], select the [Yes].
Press [ ] and [ ] keys in sequence, and select
the [Yes].
4 Press the [MENU] key to decide the
language and the Inner-hull.
5 After a few seconds, the menu sets the
screen as selected in [DISP].
Caution: In addition to English, Japanese,
there are several compatible
languages.
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
Gain
Depth
School of fish Oscillation line
Dual freq image
Range Function icon
Time mark
Rainbow pattern
Fish
LH
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
Explanation of the display:
Inner-hull
No
Yes
日本語

Chapter 1 Basic Operation CVS-126
1-4 0093132702-08
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 [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 [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
[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
Since the beam width is wide, the search range
becomes wide so that the beam can search the
deep depth.
High frequency
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-126 Chapter 1 Basic Operation
0093132702-08 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 frequency, the
schools of fish and sea bottom look different.
Caution: The low frequency screen can be
displayed in the right half of the sceen
by replacing the screen and the high
frequency screen is displayed in the
left harf. (See [2.17 Explanation of Menu
Item, Image Swap])
Zoom (Low frequency, High frequency)
The normal image is displayed in the right half of the screen and the zoom image is displayed in the left
half. 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 [2.7
Selection of Zoom])
Caution: A right and left display can be switched. (See [2.17 Explanation of Menu Item, Image
Swap])
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-126
1-6 0093132702-08
(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