Furuno FCV-627 User manual

FISH FINDER
FCV-627
OPERATOR'S MANUAL
www.furuno.com
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The paper used in this manual
is elemental chlorine free.
・FURUNO Authorized Distributor/Dealer
9-52 Ashihara-cho,
Nishinomiya, 662-8580, JAPAN
A : OCT 2011
.
Printed in Japan
All rights reserved.
Pub. No. OME-23820-A
*
00017552510
*
*
00017552510
*
(DAMI ) FCV-627
*
00017552510
*
*
00017552510
*
* 0 0 0 1 7 5 5 2 5 1 0 *

i
IMPORTANT NOTICES
General
• This manual has been authored with simplified grammar, to meet the needs of international us-
ers.
• The operator of this equipment must read and follow the descriptions in this manual. Wrong op-
eration or maintenance can cancel the warranty or cause injury.
• Do not copy any part of this manual without written permission from FURUNO.
• If this manual is lost or worn, contact your dealer about replacement.
• The contents of this manual and equipment specifications can change without notice.
• The example screens (or illustrations) shown in this manual can be different from the screens
you see on your display. The screens you see depend on your system configuration and equip-
ment settings.
• Save this manual for future reference.
• Any modification of the equipment (including software) by persons not authorized by FURUNO
will cancel the warranty.
• All brand and product names are trademarks, registered trademarks or service marks of their
respective holders.
How to discard this product
Discard this product according to local regulations for the disposal of industrial waste. For disposal
in the USA, see the homepage of the Electronics Industries Alliance (http://www.eiae.org/) for the
correct method of disposal.
How to discard a used battery
Some FURUNO products have a battery(ies). To see if your product has a battery, see the chapter
on Maintenance. Follow the instructions below if a battery is used. Tape the + and - terminals of
battery before disposal to prevent fire, heat generation caused by short circuit.
In the European Union
The crossed-out trash can symbol indicates that all types of batteries
must not be discarded in standard trash, or at a trash site. Take the
used batteries to a battery collection site according to your national
legislation and the Batteries Directive 2006/66/EU.
In the USA
The Mobius loop symbol (three chasing arrows) indicates that Ni-Cd
and lead-acid rechargeable batteries must be recycled. Take the used
batteries to a battery collection site according to local laws.
In the other countries
There are no international standards for the battery recycle symbol. The number of symbols can
increase when the other countries make their own recycle symbols in the future.
Cd
Ni-Cd Pb

ii
SAFETY INSTRUCTIONS
Indicates a condition that can cause death or serious injury
if not avoided.
The operator and installer must read the applicable safety instructions before attempting to
operate or install the equipment.
WARNING
CAUTION
Indicates a condition that can cause minor or moderate
injury if not avoided.
Warning, Caution Prohibitive Action Mandatory Action
WARNING CAUTION
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Hazardous voltage exists inside the
equipment. Refer repair to authorized
service personnel.
Immediately turn off the power at the
switchboard if the equipment is
emitting smoke or fire.
Continued use of the equipment can
cause fire or electrical shock. Contact a
FURUNO agent for service.
Do not maneuver the vessel based on
the depth indication alone.
Grounding can result.
Do not disassemble or modify the
equipment.
Fire, electrical shock or injury can result.
Use the proper fuse.
Use of an incorrect fuse can damage the
equipment and can cause fire.
Do no turn on the equipment with the
transducer out of water.
The transducer can be damaged.
The picture is not refreshed when
picture advancement is stopped.
Maneuvering the vessel in this condition
can result in a dangerous situation.
Adjust the gain correctly.
Incorrect gain may give a wrong depth
indication, which could result in a
dangerous situation.
The data presented by this equipment
is intended as a source of navigation
information.
The prudent navigator never relies
exclusively on any one source of
navigation information, for safety of
vessel and crew.
The LCD panel is made of glass.
Handle it with care.
Injury can result if the glass breaks.
Safety Instructions for the Operator

SAFETY INSTRUCTIONS
iii
WARNING CAUTION
Turn off the power at the switchboard
before beginning the installation.
Fire or electrical shock can result if the
power is left on.
Be sure no water leaks in at the
transducer or sensor mounting
location.
Water leakage can sink the vessel. Also
confirm that the transducer and/or
sensor will not loosen by ship's vibration.
The installer is solely responsible for the
proper installation of the equipment.
FURUNO will assume no responsibility
for any damage associated with
improper installation of the transducer.
Use the specified power cable.
Use of other power cable can cause fire.
Do not install the transducer or sensor
where air bubbles and noise are
present.
Performance will be affected.
The following are guidelines for
handling of the transducer cable.
- Keep fuels and oils away from the
cable.
- Locate cable in a safe place.
- Do not paint the cable.
The sheath of the cable is made of
chloroprene rubber (or polychloride
vinyl). For this reason do not paint the
cable.
Do not turn on the equipment with the
transducer out of water.
The transducer can be damaged.
Observe the following compass safe
distances to prevent interference to a
magnetic compass:
Safety Instructions for the Installer
WARNING
To avoid electrical shock, do not
remove cover. No user-serviceable
parts inside.
A warning label is attached to the equipment.
Do not remove the label. If the label is missing
or damaged, contact a FURUNO agent or
dealer about replacement.
Name: Warning Label (1)
Type: 86-003-1011-3
Code No.: 100-236-233-10
Warning Label
Display
unit
Standard
compass
Steering
compass
FCV-627 0.4 m 0.3 m

iv
TABLE OF CONTENTS
FOREWORD ........................................ v
SYSTEM CONFIGURATION .............. vi
1. OPERATION ................................. 1
1.1 Control Description......................1
1.2 Power On/Off ..............................2
1.3 Display Brilliance.........................2
1.4 Display Mode ..............................2
1.4.1 Single frequency display......2
1.4.2 Dual frequency display ........3
1.4.3 Zoom displays......................3
1.4.4 Nav data display ..................4
1.5 How to Select a Range ...............5
1.6 How to Adjust the Gain ...............5
1.7 How to Measure Depth ...............6
1.8 Menu Operating Procedure.........7
1.9 How to Shift the Range ...............7
1.10 Picture Advance Speed...............8
1.11 How to Reduce Interference .......9
1.12 How to Reduce Low Level
Noise ...........................................9
1.13 How to Erase Weak Echoes .....10
1.14 A-scope Display ........................10
1.15 Fish Information (ACCU-FISH) .11
1.15.1 How to activate
ACCU-FISH .......................12
1.15.2 Fish symbols......................12
1.15.3 Fish info .............................12
1.16 Bottom Discrimination Display ..13
1.17 Alarms .......................................14
1.18 FUNC Key .................................17
1.18.1 How to use the FUNC key .17
1.18.2 How to change the
function ..............................17
1.19 Waypoints .................................18
1.19.1 How to register a
waypoint.............................18
1.19.2 How to edit registered
waypoints...........................19
1.19.3 How to erase waypoints.....19
1.19.4 How to set destination
waypoint.............................20
1.20 Setting Up Nav Data Displays...20
1.20.1 Nav data displays ..............20
1.21 Menu Description ......................21
2. SYSTEM MENU .......................... 26
2.1 How to Display the
System Menu ............................26
2.2 Range Menu..............................26
2.3 Key Menu ..................................26
2.4 Language Menu ........................26
2.5 Units Menu................................27
2.6 Calib Menu................................27
2.7 Transducer Menu......................28
2.8 Demo Menu ..............................28
2.9 Tankenmaru Menu....................28
3. MAINTENANCE,
TROUBLESHOOTING.................29
3.1 Maintenance .............................29
3.2 How to Clean the Display Unit ..29
3.3 Transducer Maintenance ..........29
3.4 How to Replace the Fuse..........30
3.5 Battery Voltage Alert .................30
3.6 Troubleshooting ........................30
3.7 Diagnostics ...............................31
3.8 LCD Test...................................32
3.9 How to Clear the Memory,
Reset the Odometer..................32
4. INSTALLATION ...........................33
4.1 Equipment List ..........................33
4.2 Display Unit...............................34
4.3 Thru-hull Mount Transducer......35
4.4 Transom Mount Transducer......37
4.5 How to Mount a Thru-hull
Transducer Inside the Hull........37
4.6 Triducer.....................................39
4.7 Speed/Temperature Sensor
(option)......................................42
4.8 Temperature Sensor (option)....43
4.9 Wiring........................................44
4.10 IEC 61162-1 Data Sentences ...45
4.11 Adjustments after Installation....46
MENU TREE .................................. AP-1
SPECIFICATIONS ..........................SP-1
OUTLINE DRAWINGS .....................D-1
INTERCONNECTION DIAGRAM ..... S-1
INDEX ..............................................IN-1

v
FOREWORD
A Word to FCV-627 Owners
Congratulations on your choice of the FU-
RUNO FCV-627 Fish Finder. We are confi-
dent you will see why the FURUNO name has
become synonymous with quality and reliabil-
ity.
Since 1948, FURUNO Electric Company has
enjoyed an enviable reputation for innovative
and dependable marine electronics equip-
ment. This dedication to excellence is fur-
thered by our extensive global network of
agents and dealers.
This equipment is designed and constructed
to meet the rigorous demands of the marine
environment. However, no machine can per-
form its intended function unless operated
and maintained properly. Please carefully
read and follow the recommended proce-
dures for operation and maintenance.
We would appreciate hearing from you, the
end user, about whether we are achieving our
purposes.
Thank you for considering and purchasing
FURUNO equipment.
Features
The FURUNO FCV-627 is a dual frequency
(50 kHz and 200 kHz) Fish Finder. Comprised
of a display unit and a transducer, the FCV-
627 displays underwater conditions on a 5.7-
inch color LCD in various colors according to
echo strength.
The main features of the FCV-627 are
• Bright color LCD gives excellent readability
even in broad daylight.
• Waterproof construction permits installa-
tion on open bridge.
• Automatic mode automatically adjusts the
set to provide the best possible display,
from shallow to deep depths.
• ACCU-FISH feature provides estimate of
fish length with fish size dependent fish
mark.
• Bottom discrimination display provides esti-
mate of bottom composition.
• White line feature helps distinguish bottom
fish from the bottom echo.
• Gain adjusts sensitivity over the entire
screen.
• Various alarms alert you to presence of
fish, dangerous situations, etc.
• Destination waypoint feature provides
range, bearing, and time-to-go to destina-
tion waypoint (up to 20 waypoints).*
• Echo position can be output to a naviga-
tional plotter.*
• “Tankenmaru” system* outputs video signal
to other Tankenmaru-equipped partner
ship, etc., via a radio transmitter.
* Requires connection of appropriate sensor,
navigation device.
TFT LCD
The TFT LCD is constructed using the latest
LCD techniques, and displays 99.99% of its
pixels. The remaining 0.01% of the pixels may
drop out or blink, however this is not an indi-
cation of malfunction; it is an inherent property
of the LCD.

vi
SYSTEM CONFIGURATION
Solid lines denote standard supply equipment. Dashed lines denote optional supply equipment.
DISPLAY UNIT
CV-627-E
Water temperature/speed sensor
ST-02MSB, ST-02PSB
Water temperature sensor
T-02MSB, T-02MTB, T-03MSB
520-5PSD, 520-5MSD, 525-5PWD,
525STID-MSD, 525STID-PWD
Transducer
12-24 VDC
GPS Navigator
External Equipment
Radio Transmitter*
* Radio transmitter of
SHIMANO INC.
SHIMANO INC.
make display unit
FCV-627
Display
Unit
Tankenmaru System
Electric Relay

1
1. OPERATION
1.1 Control Description
* Inoperative when equipped with “Tankenmaru” system.
No. Control Function
1 MENU/ESC • Opens menu. Go back one page in multi-page menu.
• Escapes from current operation.
2STWX
(TrackPad)
• Selects items on the menu.
• Changes settings.
• Moves VRM (Variable Range Marker) by using Sor Texcept for nav
mode.
3 ENTER Saves settings.
4 RANGE Opens range selection window.
5 MARK* Registers waypoint.
6FUNC Short press: Opens window programmed.
Long press: Opens function key programming window.
7GAIN Push: Opens [Auto Gain] setting window.
Rotate: Manually adjusts gain.
8 MODE Selects display mode.
9/BRILL Short press: Turns on power; opens the [Brill] adjustment window.
Long press: Turns off power.
How to remove the cover If you remove the display unit (for desktop
installation) after an outing...
Pull down on the catch at the bottom of the cover
and pull the cover toward you.
Cover the connectors with the supplied caps to
keep dust out of terminals.
• Transducer cable: Use the MJ cable cap sup-
plied with the transducer cable.
• 12-24 VDC, NMEA, XDR: Use “port” and
“XDR” caps.
• Power cable assy.: Use supplied cap.
1
2
3
4
5
6
7
8
9
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1. OPERATION
2
1.2 Power On/Off
1. Press the /BRILL key to turn on the
power. The unit beeps then the startup
screen appears.
2. To turn off the power, press the /BRILL
key more than three seconds. The time
remaining until the power is turned off is
counted down on the screen.
1.3 Display Brilliance
1. Press the /
BRILL key momen-
tarily to show the
[Brill] adjustment
window.
2. Press the /BRILL key. Continual
pressing changes the brilliance continu-
ously (0→1→...→9→8→...→0→1→...).
"0" is the dimmest and "9" is the brightest.
You can also adjust the brilliance with W
or X.
3. Press the ENTER key or MENU/ESC key
to save the setting and close the window.
(The window automatically closes if there
is no key operation for approx. six sec-
onds.)
Note: Key panel brilliance cannot be adjusted
manually; its brilliance is changed automati-
cally with display brilliance, as shown below.
• Max. brilliance: Min. panel brilliance
• Min. brilliance: Max. panel brilliance
1.4 Display Mode
1. Rotate the MODE knob to open the mode
setting window, which is displayed for six
seconds.
2. Rotate the MODE knob again to select
the display mode desired. The screen re-
lated to the mode you selected appears.
1.4.1 Single frequency display
Low frequency (50 kHz)
The sounder uses ultrasound pulse signals to
detect bottom conditions. The lower the fre-
quency of the signal, the wider the detection
area. Therefore, the 50 kHz frequency is use-
ful for general detection and judging bottom
condition.
High frequency (200 kHz)
The higher the frequency of the ultrasound
pulse signal, the better the resolution. For this
reason the 200 kHz frequency is ideal for de-
tailed observation of schools of fish.
Beamwidth
Start-up screen
3-5 seconds later
the last-used
mode is automati-
cally activated.
(You can skip the
wait by pressing
any key.)
Brill
Nav data mode 1
Low frequency zoom mode*
Low frequency mode (50 k)
Dual frequency mode
High frequency mode (200 k)
High frequency zoom mode**
Nav data mode 2
*: The indication at the top of the screen is
BL-LF, BZ-LF or MZ-LF.
**: The indication at the top of the screen is
BL-HF, BZ-HF or MZ-HF.
BL: Bottom lock, LF: Low frequency,
BZ: Bottom zoom, HF: High frequency,
MZ: Marker zoom
Low
frequency
High
frequency

1. OPERATION
3
Single frequency display
1.4.2 Dual frequency display
The 50 kHz picture appears on the left; the
200 kHz picture on the right. This display is
useful for comparing the same picture with
two different frequencies.
Dual frequency display
1.4.3 Zoom displays
Zoom mode expands chosen area of the sin-
gle frequency picture. Three modes are avail-
able: bottom lock, bottom zoom and marker
zoom. The default zoom mode is bottom lock.
Bottom lock display
The bottom lock display provides a normal
picture on the right half of the screen and a
10-30 feet (default: 15 feet) wide layer in con-
tact with the bottom is expanded onto the left
half of the screen. This mode is useful for de-
tecting bottom fish.
Note 1: To adjust the range of the zoom dis-
play, go to the [Range] menu (see section
2.2).
Note 2: To show or hide the zoom marker, go
to the [Display] menu.
Picture advance
speed
Display
modeRange
Gain
Minute
marker
(Each bar
equals 30
sec.)
Data
box
Color
bar
Depth
Transmission
line
Fish Range
scale
Bottom
AUTO
_
R G:AF
AUTO
_
R G:AF
LF
LF
x1
x1
0.0
0.0
15.5 kn
13.5
°
C
15.5 kn
13.5
°
C
0
20
40
60
80
0
20
40
60
80
48.6
48.6
m
m
Alarm
icon
Freq.
(kHz)
Beamwidth Resolution Detection
range
Bottom
tail
50
200
Wide
Narrow
Low
High
Deep
Shallow
Long
Short
50 kHz
picture 200 kHz
picture
48.6
48.6
m
m
AUTO
_
R  G:AF
AUTO
_
R  G:AF
LF/HF
LF/HF
x1
x1
0.0
0.0
0
20
40
60
80
0
20
40
60
80
0
20
40
60
80
0
20
40
60
80
Bottom lock
display
Zoom
marker
* This section zoomed on
the left half.
Single freq.
display
Bottom
displayed
flat
Zoomed
fish
Fish
AUTO
_
R  G:AF
AUTO
_
R  G:AF
BL-LF
BL-LF
x1
x1
0.0
0.0
0
10
20
30
40
0
10
20
30
40
5
4
3
2
1
0
5
4
3
2
1
0
21.7
21.7
m
m
*

1. OPERATION
4
Bottom zoom display
The bottom zoom mode expands bottom and
bottom fish on the left-half window. This mode
is useful for tracking bottom contour. When
the bottom depth increases (or decreases),
the display automatically shifts to keep the
bottom echo at the lower part of the screen.
Marker zoom display
The marker zoom mode expands chosen
area of the normal picture to full vertical size
of the screen on the left-half window. You may
specify the portion to expand by operating the
VRM (Variable Range Marker), which you can
shift with Sor T. The area between the VRM
and zoom marker is expanded. This mode is
useful for determining the size of fish in the
middle water.
1.4.4 Nav data display
The nav data displays appear on the left 2/3
of the screen. Data other than depth requires
appropriate sensor.
Two nav data displays are available, Nav
Data 1 or Nav Data 2, and you may select
which to use on the [Display] menu. The de-
fault settings are as follows.
NAV1: Two-data display (SPEED (STW),
WIND)
NAV2: Four-data display (DEPTH,
TEMPERATURE, TRIP METER,
ODOMETER)
You can display between two and four items
in a nav data display and select the item and
order to display them. For details, see section
1.20.
NAV1, NAV2 displays
Bottom
Zoom
marker
Switched with
depth
AUTO
_
R G:AF
AUTO
_
R G:AF
BZ-LF
BZ-LF
x1
x1
0.0
0.0
30.8
30.8
m
m
0
10
20
30
40
0
10
20
30
40
27
28
29
30
31
32
27
28
29
30
31
32
Bottom zoom
display
Single freq.
display
Zoomed
fish
Fish
Variable range
marker
* This section is zoomed.
Zoom marker
AUTO
_
R G:AF
AUTO
_
R G:AF
MZ-LF
MZ-LF
x1
x1
0.0
0.0
17.0
25.0
25.0m
0
10
20
30
40
0
10
20
30
40
17
18
19
20
21
22
17
18
19
20
21
22
Marker zoom
display
Single freq.
display
*
49.6
m
AUTO _ R  G:AF
AUTO _ R  G:AF
LF
LF
x1
x1
49.6
m
AUTO _ R  G:AF
AUTO _ R  G:AF
LF
LF
x1
x1
0
20
40
60
80
0
20
40
60
80
NAV1 display NAV2 display

1. OPERATION
5
1.5 How to Select a
Range
The basic range may be selected in the [Auto]
or [Manual] mode.
Note: The RANGE key is inoperative when
the bottom discrimination feature is active.
1. Press the RANGE key to open the
[Range] setting window.
2. Use Wor Xto select [Auto] or [Manual].
[Auto]: The range changes automatically
to display the bottom echo on the screen
always. (The shift function is inoperative
in the auto mode.) [AUTO_R] is shown at
the top left corner on the screen.
[Manual]: The range may be selected
from the eight ranges listed below.
[MAN_R] is shown at the top left corner
on the screen.
If you selected [Auto], go to step 4. For
[Manual], go to the next step.
3. For [Manual], use the RANGE key (or S
or T) to select the range.
*: Japanese unit of depth measurement
Note: Basic ranges may be preset as de-
sired. For further details, see section 2.2.
4. Press the ENTER key.
Note: The range mode indication, which ap-
pears at the top-left corner, may be turned on
or off with [Header Info] on the [Display]
menu. For details, see [Header Info] on page
23.
1.6 How to Adjust the
Gain
How to select the gain adjustment mode
The gain may be adjusted automatically
([Fishing] or [Cruising]) or manually. In auto-
matic adjustment, the range is automatically
selected to display the bottom echo in reddish
brown. The automatic gain setting can be fine
tuned with the offset gain feature. Clutter and
TVG are also adjusted automatically when
automatic gain is active.
For manual gain adjustment, adjust the gain
according to signal strength.
These are
available with
Manual mode.
Unit Basic Range
123456 7 8
1000
600
400
200120603015
300
200150
80
40
2010
5
m
ft
fm 150
100
80
40
2010
5
3
pb 200
150
100
20 501053
HR* 200
150
1005030
15
84
CAUTION
Adjust the gain correctly.
Incorrect adjustment can lead to a dangerous
situation if the boat is steering according to the
depth indication.
Too high Correct Too low

1. OPERATION
6
1. Press the GAIN knob to open the [Auto
Gain] setting window.
2. Press the GAIN knob (or Sor T) again
to select [Fishing] or [Cruising].
[Fishing]: This mode clearly displays
weaker echoes and is useful for search-
ing schools of fish. "G:AF" is shown at the
top left corner on the screen.
[Cruising]: This mode clearly displays
stronger echoes (for example, bottom)
and suppresses weak echoes. Use this
mode for general cruising. "G:AC" is
shown at the top left corner on the screen.
[Off]: For manual gain adjustment. The
display shows, "G:X.X" (X.X=gain setting)
when manual gain is active.
If you selected [Fishing] or [Cruising], you
can apply an offset to the gain, at step 3.
To apply no offset, go to step 4. For [Off],
do steps 4 and 5.
3. Press Wor X(setting range: -5 to +5) to
apply an offset. Press Wto decrease the
offset; Xto raise the offset.
4. Press the ENTER key. The new gain set-
ting is also applied to past echoes.
5. For manual adjustment, rotate the GAIN
control to set the gain (0.0 to 10).
1.7 How to Measure
Depth
The VRM (Variable Range Marker) functions
to measure the depth to schools of fish, etc.
This function is inoperative when a NAV data
display is active.
1. Use Sor Tto place the VRM on the ob-
ject to measure depth.
2. Read the VRM depth just above the VRM.
How to measure depth with the VRM
VRM
Depth to VRM
49.6
49.6
m
m
39.8
AUTO
_
R G:AF
AUTO
_
R G:AF
LF
LF
x1
x1

1. OPERATION
7
1.8 Menu Operating
Procedure
Your fish finder has five main menus: Sound-
er, Display, Alarm, Data, and System. Below
is the basic menu operating procedure.
1. Press the MENU/ESC key to open the
menu.
2. Use Sor Tto select the main menu de-
sired. The cursor (yellow) highlights cur-
rent selection. The items in the sub menu
change with the menu selected.
3. Press the ENTER key (or X). The cursor
(yellow) shifts to the sub menu and the
current selection on the main menu win-
dow (left) is highlighted in gray.
4. Use Sor Tto select the menu item de-
sired and press the ENTER key. A setting
box or window appears depending on
menu item. The example below shows
the setting options and setting window for
[Depth Size].
5. Use Sor Tto select an option or change
a value.
6. Press the ENTER key (or W) to save the
setting. The setting box or window disap-
pears. To escape without changing a set-
ting, press the MENU/ESC key instead of
the ENTER key.
7. To select another menu, press the
MENU/ESC key (or W). The cursor (yel-
low) moves to the main menu.
8. Press the MENU/ESC key to close the
menu.
Note: Hereafter, this manual replaces the in-
struction “use Sor Tto (select an item or
change a value)”, with “select”.
1.9 How to Shift the
Range
The basic range and range shift together give
you the means to select the depth you can
see on the screen. The basic range can be
thought of as providing a “window” into the
water column and range shifting as moving
the “window” to the desired depth.
Range and display shift concept
Note: This function is inoperative when
[AUTO_R] (auto range mode indication) is
displayed.
The basic range can be shifted up or down in
the [Manual] mode as follows:
1. Open the menu, select the [Sounder]
menu and press the ENTER key.
Sounder
Cursor
(yellow)
Currently selected menu
Main menu
Menu item
window
Sub menu
Operating
guidance
Main menu
Names of sub
menus appear
when selected.
See Chapter 2.
[ENTER] : Set
[MENU] : Cancel
Small
Medium
Large
Setting options Setting window
“Window” can be
shifted up and
down to select
starting depth.
Display

1. OPERATION
8
2. Select [Shift] and press the ENTER key.
3. Set the amount of shift desired and press
the ENTER key. The step for the amount
of shift depends on setting range on the
[Range] sub menu in the [System] menu.
Below are the steps for feet and meters.
4. Press the MENU/ESC key twice to close
the window.
Note: Echoes may be lost if the amount of
shift is greater than actual depth.
1.10 Picture Advance
Speed
The picture advance speed determines how
quickly the vertical scan lines run across the
screen. When selecting a picture advance
speed, keep in mind that a fast advance
speed will expand the size of a school of fish
horizontally on the screen and a slow ad-
vance speed will contract the school. Use a
fast advance speed to observe a rugged bot-
tom, and use a slow advance speed to moni-
tor a smooth bottom.
Picture and picture advance speed
1. Open the menu, select [Sounder] and
press the ENTER key.
2. Select [Pic. Advance] and press the EN-
TER key.
[Pic. Advance] setting window
3. Select picture advance speed desired
and press the ENTER key. [1/16] is the
slowest speed and [x4] is the fastest
speed. [1/16] means one scan line is pro-
duced every 16 transmissions. [Stop]
stops picture advancement and is useful
for taking a screenshot. Current picture
advance speed is displayed at the top-
right corner of the screen.
4. Press the MENU/ESC key twice to close
the window.
Unit: feet Unit: meter
Range Step Range Step
7 - 10 2 2 - 5 1
11 - 20 5 6 - 10 2
21 - 50 10 11 - 20 5
60 - 100 20 21 - 50 10
110 - 250 50 60 - 100 20
260 - 500 100 110 - 250 50
550 - 1000 200 260 - 500 100
1100 - 2500 500 550 - 1000 200
2600 - 4000 500 1100 - 1200 500
Fast Slow
Fast
Slow
CAUTION
The picture is not refreshed when
picture advancement is stopped.
Maneuvering the vessel in this condition
may result in a dangerous situation.

1. OPERATION
9
1.11 How to Reduce
Interference
Interference from other acoustic equipment
operating nearby or other electronic equip-
ment on your boat may show itself on the dis-
play as shown in the figure below. Follow the
procedure below to reduce interference.
Interference
1. Open the menu, select [Sounder] and
press the ENTER key.
2. Select [Interference] and press the EN-
TER key.
[Interference] setting window
3. Select the degree of interference reduc-
tion desired and press the ENTER key.
[Auto]: Interference is suppressed auto-
matically.
[High], [Medium], [Low]: [High] provides
the greatest degree of interference reduc-
tion and [Low] is the smallest.
[Off]: Turn off the interference rejector.
Note: Turn off the interference rejector
when no interference exists, so as not to
miss weak echoes from small targets.
4. Press the MENU/ESC key twice to close
the window.
1.12 How to Reduce
Low Level Noise
Low intensity "speckles," caused by sedi-
ments in the water or noise, may appear over
most of screen. These speckles can be sup-
pressed by adjusting the [Clutter].
Clutter appearance
Note: [Clutter] cannot be adjusted when
[Fishing] or [Cruising] is selected (on the [Auto
Gain] setting window).
1. Open the menu, select [Sounder] and
press the ENTER key.
2. Select [Clutter] and press the ENTER
key.
[Clutter] setting window
3. Select the degree of clutter reduction de-
sired and press the ENTER key. The set-
ting range is 0% to 100% in intervals of
ten. The larger the setting value, the
greater the degree of reduction.
4. Press the MENU/ESC key twice to close
the window.
Interference from
other sounder
Electrical interference

1. OPERATION
10
1.13 How to Erase
Weak Echoes
Sediment in the water or reflections from
plankton may be painted on the display in low
intensity tones.
Appearance of weak echoes
These weak echoes may be erased by using
the [Color Erase] feature. This feature erases
weaker echoes sequentially to show only
strong echoes and clear the picture.
1. Open the menu, select [Sounder] and
press the ENTER key.
2. Select [Color Erase] and press the EN-
TER key.
[Color Erase] setting window
3. Select the color to erase and press the
ENTER key. The setting range is 0 to
50% in intervals of one per cent. The larg-
er the setting value, the greater the num-
ber of colors that are erased.
4. Press the MENU/ESC key twice to close
the window.
1.14 A-scope Display
The A-scope display shows echoes at each
transmission with amplitudes and tone pro-
portional to their intensities, on the right 1/3 of
the screen. The display shows strong echoes
with strong amplitude; weak echoes in weak
amplitude. Thus the A-scope display is useful
for estimating the kind of school of fish and
bottom composition.
Note: The A-scope display is only available
with the high frequency display in dual fre-
quency operation.
1. Open the menu, select [Display] and
press the ENTER key.
2. Select [A-Scope] and
press the ENTER key.
3. Select the A-scope pre-
sentation type desired and
press the ENTER key.
[Off]: Turn off the A-scope display.
[Normal]: Display shows echoes at each
transmission with amplitudes and tone
proportional to their intensities.
[Peak]: "Normal" A-scope display plus
peak-hold amplitude picture for last five
seconds in dots.
Weak
echoes

1. OPERATION
11
4. Press the MENU/ESC key twice to close
the window.
A-scope display
Directional angle display
With the transducer selected for other than
600 W, directional angle range line, direction
angle, directional radius, directional radius
value and directional radius line appear on the
A-scope display. The directional angle display
provides an at-a-glance view of the available
detection range. In the example below an
echo from a school of fish is at the depth of 20
m. and within 8. 5 m radius of the center of the
transducer beam.
1.15 Fish Information
(ACCU-FISH)
The ACCU-FISH feature measures the length
of individual fish and tags the fish with a fish
symbol whose size is proportional to the
length of the fish. The length or depth of the
fish can be indicated digitally. Connection to a
transducer that supports ACCU-FISH is re-
quired.
Note: The fish length found by this fish finder
is intended for reference purposes; it is not a
completely accurate measurement of fish
length.
Considerations for the ACCU-FISH
• The 600 W transducers which support
ACCU-FISH are 520-5PSD, 520-5MSD,
525-5PWD, 525STID-MSD and
525STID-PWD.
• Echo intensity depends on fish species.
When the fish length differs between the in-
dicated length and the actual length, you
can compensate the difference on the
[Calib] menu (see section 2.6).
• ACCU-FISH is inoperative when the zero
line rejector is active.
• High and low frequencies are alternately
transmitted when ACCU-FISH is active, re-
gardless of mode selection.
• A fish whose depth is shallower than 2 m or
greater than 100 m cannot be measured.
• If the transducer is installed inside the hull,
the signal is attenuated by the hull. There-
fore, a fish may not be detected or the fish
length indicated may be shorter than actual
length.
• In a school of fish, echoes overlap one an-
other, so the margin of error will be greater.
• The bottom echo must be present to show
the fish symbols.
• The TX pulse length changes according to
ACCU-FISH On/Off state. This causes a
difference in both sensitivity and the ech-
oes viewed.
Weak reflection
(small school of
fish or noise)
Past amplitude
pictures are
displayed with
dots in [Peak]
mode.
A-scope
display
Reflection
from school
of fish
Single freq.
display
Strong
reflection
(bottom)
AUTO
_
R G:AF
AUTO
_
R G:AF
LF
LF
x1
x1
59.8
m
59.8
m
0.0
0.0
8.5
25.5
25.5
0
20
40
60
80
0
20
40
60
80
Directional
angle radius
Directional
angle radius
line
Directional
angle range
line
School of
fish
LF
LF
x1
x1
0.0
0.0
8.5
25.5
25.5
0
20
40
60
80
0
20
40
60
80

1. OPERATION
12
1.15.1 How to activate
ACCU-FISH
ACCU-FISH is inoperative when the trans-
ducer type is selected to 600W (on the [Trans-
ducer] menu).
1. Open the menu, select [Display] and
press the ENTER key.
2. Select [ACCU-FISH] and press the EN-
TER key to show the [ACCU-FISH] menu.
3. Select [ACCU-FISH] and press the EN-
TER key.
4. Select [On] to enable ACCU-FISH.
1.15.2 Fish symbols
1. Open the menu, select [Display] and
press the ENTER key.
2. Select [ACCU-FISH] and press the EN-
TER key to show the [ACCU-FISH] menu.
3. Select [Fish Symbols] and press the EN-
TER key.
[Fish Symbols] setting box
4. Select desired symbol and press the EN-
TER key. The size of the symbol is scaled
according to the estimated length of the
fish.
Note: To hide the fish symbol, select [Off]
at step 4 and press the ENTER key.
Note: You can select which frequency display
to show the fish symbols and fish information,
with [Symbols Area] on the [ACCU-FISH]
menu.
• [Dual]: Symbols and info shown on both HF
and LF displays.
• [HF]: Symbols and info shown on HF dis-
play.
• [LF]: Symbols and info shown on LF dis-
play.
1.15.3 Fish info
1. Open the menu, select [Display] and
press the ENTER key.
2. Select [ACCU-FISH] and press the EN-
TER key to show the [ACCU-FISH] menu.
3. Select [Fish Info] and press the ENTER
key.
[Fish Info] setting box
4. Use Sor Tto select [Off], [Fish Size] or
[Depth] as appropriate and press the EN-
TER key.
Fish symbols with fish info figure
Striped Solid Circle Square
Large fish symbol
(more than 50 cm, or
more than 20 inches)
Small fish symbol
(10 to 49 cm, or 4 to
19 inches)
Fish length or depth
is shown in red.