Furuno FCV-288 User manual

The paper used in this manual
is elemental chlorine free.
・FURUNO Authorized Distributor/Dealer
9 52 Ashihara cho,
Nishinomiya, 662 8580, JAPAN
A
:
APR
2012
.
Printed in Japan
All rights reserved.
D
:
AUG
.
08, 2014
Pub. No.
OME-23830-D
(
GREG
)
FCV-288
0 0 0 1 7 6 5 7 9 1 3

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 man-
ual and equipment specifications can change without notice.
• 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 home page 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 leg-
islation 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 not 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.
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
A warning label and a danger label are attached
to the equipment. Do not remove these labels. If
the labels are missing or damaged, contact a
FURUNO agent or dealer about replacement.
Name: Warning Label
Type: 02-166-1123-0
Warning Label
Display
unit
Standard
compass
Steering
compass
FCV-288 0.95 m 0.60 m
Name: Danger Label HV
Type: 02-166-1124-1
WARNING
To avoid electrical shock, do not
remove cover. No user-serviceable
parts inside.
䄺
Ў䰆ℶ㾺⬉ˈ䇋ϡ㽕ᠧᓔⲪᄤDŽ
ݙ䚼᮴⫼᠋ৃҹ㓈ׂⱘ఼ӊDŽ
Name: Danger Label
Type: 02-166-1126-1

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.........6
1.9 How to Shift the Range ...............7
1.10 Picture Advance Speed...............8
1.11 How to ReduceInterference ........8
1.12 How to Reduce Low Level
Noise ...........................................9
1.13 How to Erase Weak Echoes .......9
1.14 A-scope Display ........................10
1.15 Alarms .......................................10
1.16 FUNC Key .................................13
1.16.1 How to use the FUNC key .13
1.16.2 How to change the
function ..............................13
1.17 Position Data.............................13
1.18 Setting Up Nav Data Displays...14
1.18.1 Nav data displays ..............14
1.19 Menu Description ......................15
2. SYSTEM MENU .......................... 18
2.1 How to Display the System
Menu .........................................18
2.2 Range Menu..............................18
2.3 Key Menu ..................................19
2.4 Language Menu ........................19
2.5 Units Menu ................................19
2.6 Calib Menu ................................19
2.7 Demo Menu...............................20
3. MAINTENANCE,
TROUBLESHOOTING ................ 21
3.1 Maintenance..............................21
3.2 How to Clean the Display Unit ..21
3.3 Transducer Main-tenance .........21
3.4 How to Replace the Fuse..........22
3.5 Battery Voltage Alert .................22
3.6 Troubleshooting ........................22
3.7 Diagnostics ...............................23
3.8 LCD Test...................................24
3.9 How to Clear the Memory,
Reset the Odometer..................24
4. INSTALLATION ...........................25
4.1 Equipment Lists ........................25
4.2 Display Unit...............................27
4.3 Transducer................................28
4.4 Water Temperature/Speed
Sensor.......................................28
4.5 Wiring........................................29
4.6 Cable Fabrication......................30
4.7 Transducer Setting....................32
4.8 Input/Output Sentences ............32
4.9 Adjustments after Installation....33
4.10 NMEA Port Setting....................34
MENU TREE .................................. AP-1
T42 AND T80 TEMPERATURE
SENSORS...................................... AP-3
SPECIFICATIONS ..........................SP-1
PACKING LIST.................................A-1
OUTLINE DRAWING........................D-1
INTERCONNECTION DIAGRAM ..... S-1
INDEX ..............................................IN-1

v
FOREWORD
A Word to FCV-288 Owners
Congratulations on your choice of the
FURUNO FCV-288 Fish Finder. We are
confident you will see why the FURUNO
name has become synonymous with quality
and reliability.
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
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-288 is a dual frequency
(50 kHz and 200 kHz) Fish Finder. Comprised
of a display unit and a transducer,
the FCV-288 displays underwater conditions
on a 10.4-inch color LCD in various colors
according to echo strength.
The main features of the FCV-288 are:
• Automatic mode automatically adjusts the
set to provide the best possible display,
from shallow to deep depths.
• 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.
• Echo position can be output to a naviga-
tional plotter.*
*: Requires connection of appropriate naviga-
tion 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
Standard configuration is shown below with solid line.
Low
Freq.
Transducer
High
Freq.
Transducer
Navigation
Equipment
DISPLAY UNIT
CV-288
Power
12-24 VDC
Rectifier
PR-62
100/110/115/
220/230 VAC
1
φ , 50/60 Hz
Water Temperature Sensor
T42, T80
Water Temp.+Speed Sensor
ST-02MSB, ST-02PSB

1
1. OPERATION
1.1 Control Description
How to remove the cover (Option)
While pressing the center of the cover with your thumbs as illustrated, pull the cover toward you.
No. Control Function
1BRILL Short press: Turns on power; opens the [Brill] adjustment window.
Long press: Turns off power.
2 MODE Selects display mode.
3GAIN Push: Opens [Auto Gain] setting window.
Rotate: Manually adjusts gain.
4 FUNC Short press: Opens window programmed.
Long press: Opens function key programming window.
5 MARK Outputs the position data.
6 RANGE Opens range selection window.
7STWX
(TrackPad)
• Selects items on the menu.
• Changes settings.
• Moves VRM (Variable Range Marker) by using Sor Texcept for nav
mode.
8 MENU ESC • Opens menu. Goes back one page in multi-page menu.
• Escapes from current operation.
9 ENTER Saves settings.
1234567
8
9

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 goes off is
counted down on the screen.
1.3 Display Brilliance
1. Press the
BRILL key mo-
mentarily to show
the [Brill] adjust-
ment 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 is useful for gen-
eral 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 is ideal for detailed obser-
vation of schools of fish.
Beam width
Start-up screen
Nav data mode 1
Low frequency zoom mode*
Low frequency mode (50 kHz)
Dual frequency mode
High frequency mode (200 kHz)
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
50kHz
200kHz

1. OPERATION
3
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.
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
16-600 feet (default: 30 feet) wide layer in
contact with the bottom is expanded onto the
left half of the screen. This mode is useful for
detecting 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.
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.
Depth
Display
mode
Picture advance
speed
Color
bar
Alarm
icon
x1
*Minute marker ( two different color bars in 1 min.)
Range
Depth scale
0.0
Zero line
20
40
60
36.8
ft
11.1kt SOG
8.2 ° C
Bottom
Fish
echo
Data box
Gain
AUTO_R LF L:AF
*
0
50 kHz
picture 200 kHz
picture
36.8
ft
20
40
60
20
40
60
x1
AUTO_R L:AF LF/HF H:AF

0.0
Freq.
(kHz)
Beamwidth
Resolution
Detection
range
Bottom
tail
50
200
Wide
Narrow
Low
High
Deep
Shallow
Long
Short
* This section zoomed on the left half.
Bottom displayed flat
Zoomed
fish
Fish
21.7
21.7
m
m
*
Single freq. displayBottom lock display
AUTO_R BL-LF L:AF x1
0.0
40
50
60
20
40
60
0
Zoom Marker
Zoom marker
Zoom marker automatically follows change
in depth.
Single freq. displayBottom zoom display
Bottom
45.2ft
x1
0.0
40
50
60
20
40
60
0
AUTO_R BZ-LF L:AF

1. OPERATION
4
Marker zoom display
The marker zoom mode expands the 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 2/5
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 the
combination of data on the [Display] menu.
The default 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 1.18.
NAV1, NAV2 displays
* This area zoomed on left half of screen.
Fish
school
x1
47.2ft
Single freq. displayMarker zoom display
*
32.3
Zoomed
fish echo
Variable
Range
Marker 20
40
60
0
30
35
40
Zoom marker
AUTO_R MZ-LF L:AF
NAV1 display
NAV2 display
x1
0.0
20
40
60
36.8ft
11.1 kt SOG
8.2 ° C
AUTO_R G:AF LF
0
x1
0.0
20
40
60
36.8ft
11.1 kt SOG
8.2 ° C
AUTO_R G:AF LF
0
LF L:AF
LF L:AF

1. OPERATION
5
1.5 How to Select a
Range
The basic range may be selected in the [Auto]
or [Manual] mode.
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.
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] in the [Display] menu.
For details, see [Header Info] on page 16.
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 gain 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.
1. Press the GAIN knob to open the [Auto
Gain] setting window.
2. Press the GAIN knob (or Sor T) again
to select [Fishing], [Cruising] or [Off].
[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.
These are
available with
Manual mode.
Unit Basic Range
12345678
10005002501206030
300
15080
40
20
10
m
ft
500 1000
1600 3000
160804020105
fm 250 500
CAUTION
Adjust the gain correctly.
Incorrect adjustment can lead to a dangerous
situation if the boat is steered according to the
depth indication.
Too high Correct Too low

1. OPERATION
6
[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).
Individual Gain Setting
The gain of the low and high frequencies can
be set individually on the dual frequency dis-
play (paragraph 1.4.2). Turn off [Auto Gain]
(section 1.6) to enable this function. Press W
to select the LF or Xto select HF, then adjust
the Gain control. The setting range for either
frequency is 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.
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.
VRM
32.5
VRM Depth
x1
38.7
ft
20
40
60
0
AUTO_R LF L:AF
Cursor
(yellow)
Currently selected menu
Sub menu
Operating
guidance
Main menu
Names of sub
menus appear
when selected.
See Chapter 2.

1. OPERATION
7
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 (yellow)
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.
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.
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.
[ENTER] : Set
[MENU] : Cancel
Small
Medium
Large
Setting options Setting window
Unit:
feet
Unit:
meter
Unit:
fathom
Range Range Range Step
-52-301
-6-10-2
16 - 20 11 - 20 - 5
21 - 50 21 - 50 30 - 500 10
60 - 100 60 - 100 - 20
110 - 250 110 - 250 500 - 1000 50
260 - 500 260 - 500 1000 -
1500
100
550 - 1000 550 - 1000 - 200
1100 - 9000 1100 - 3000 - 500
“Window” can be
shifted up and
down to select
starting depth.
Display

1. OPERATION
8
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.
1. Open the menu, select [Sounder] and
press the ENTER key.
2. Select [Pic. Advance] and press the EN-
TER key.
3. Select picture advance speed desired
and press the ENTER key. [1/16] is the
slowest speed and [x4] is the fastest
speed. The fractions denote the number
of scan lines produced per transmission.
For example, [1/16] means one scan line
is produced 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.
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.
1. Open the menu, select [Sounder] and
press the ENTER key.
2. Select [Interference] and press the EN-
TER key.
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.
Interference from
other sounder
Electrical interference

1. OPERATION
9
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].
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.
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 per cent. The larger the setting value,
the greater the degree of reduction.
4. Press the MENU ESC key twice to close
the window.
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.
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.
Weak
echoes

1. OPERATION
10
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 1/5 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 [Off] or [On] and
press the ENTER key.
4. Press the MENU ESC key twice to close
the window.
1.15 Alarms
This fish finder has four fish alarms. When the
conditions of an alarm are met, the audio
alarm sounds and the alarm icon (flashing)
appears at the top right corner on the display.
The audio alarm may be silenced by pressing
any key. The alarm icon remains on the
screen until the cause of the alarm is removed
or the offending alarm is disabled.
Description of alarms
zFish alarms
The fish school alarm alerts you to a school
of fish in the set alarm zone.
The bottom fish alarm is given when a fish is
within the specified distance from the bottom.
Available when the bottom lock display is ac-
tive.
The water temperature alarm* alerts you
when the water temperature is within (inside
alarm) the alarm range set or under/over (out-
side alarm) the range set.
The bottom alarm alerts you when the bot-
tom echo (displayed in red or reddish brown)
is within the alarm range set.
* Requires applicable sensor.
A-scope display
Fish echo
Weak reflection
(small fish or noise)
Single frequency display
x1
46.1
ft
Strong reflection
(bottom)
20
40
60
0
AUTO_R LF L:AF
AUTO
_
R
AUTO
_
R
LF
LF
x1
x1
Alarm icon*
(flashing)
: Multiple alarm
* Appears when alarm
condition is met.
L:AF
L:AF

1. OPERATION
11
How to activate a fish alarm
Multiple fish alarms (ALARM1 - ALARM3, de-
fault names) can be activated. In this case,
the audio and visual alarms are released
when all alarm conditions are met. For exam-
ple, when the Bottom alarm is set for 10-20
feet and the Temperature alarm is set for [In-
side] and 65°F with a span of 1.0°F. The sys-
tem judges if the depth to the bottom is 10-20
feet and water temperature is within the range
of 65-66°F. If the depth to the bottom and wa-
ter temperature is within the range set, the au-
dio and visual alarms are released. The
alarms are not released if only one condition
is met.
1. Open the menu, select [Alarm] and press
the ENTER key.
2. Select an alarm among [ALARM1] -
[ALARM3] (default alarm names) and
press the ENTER key.
3. Select [Setting] and press the ENTER
key. If you want to change the name of an
alarm, go to step 4. Otherwise go to step
6.
4. To change the name of the
alarm, select [Name] and
press the ENTER key.
5. Enter the name of the alarm.
(Max. of eight characters)
1) Use Sor Tto select a character. Use
Sto select a character in numerical
order followed by alphabet order. Use
Tto select a character in reverse or-
der of that with S.
2) Press Xto move the cursor to the
next place.
3) Repeat steps 1) and 2) to complete
the name.
4) Press the ENTER key to finish.
6. Select [Sound] and press the ENTER
key.
7. Select desired alarm sound and press the
ENTER key.
8. Select [Fish Type], [Temperature] or [Bot-
tom] as applicable and press the ENTER
key.
9. Do one of the following according to the
item selected at step 8.
Fish Type
1) Select [Fish School] or [Bottom Fish
(Only BL)] and press the ENTER key.
2) Select [Fish Level] and press the EN-
TER key.
3) Select the echo strength that triggers
the alarm, referring to the information
below.
[Weak]: Echoes stronger than light-
blue trigger the alarm.
[Medium]: Echoes stronger than yel-
low trigger the alarm.
[Strong]: Echoes stronger than red
trigger the alarm.
*
*
*
* Operable when corresponding
alarm is activated.

1. OPERATION
12
4) Select the [From] that is below [Depth]
and press the ENTER key.
5) Enter the width of the alarm and press
the ENTER key.
The alarm marker appears at the
starting point for the alarm. (The
marker appears only when the corre-
sponding alarm is active.) The starting
depth for the Fish School alarms is the
transducer position. For the Bottom
Lock alarm the starting depth is the
distance from the bottom.
6) Select [Span] and press the ENTER
key.
7) Enter the alarm width and press the
ENTER key.
Water temperature
1) Select [Inside] or [Outside] as appli-
cable and press the ENTER key.
2) Select [From] and
press the ENTER key.
3) Enter the starting tem-
perature for the alarm
and press the ENTER key.
4) Select [Span] and
press the ENTER key.
5) Enter the width for the
alarm and press the
ENTER key.
Bottom
1) Set [Bottom] to [On] and press the EN-
TER key.
2) Select [From] and
press the ENTER
key.
3) Set the starting depth
and press the ENTER
key.
4) Select [Span] and
press the ENTER key.
5) Set the width of the
alarm and press the
ENTER key.
10. Press the MENU ESC key
to show the [Fish Alarm] setting window.
11. Select [Alarm] and press the ENTER key.
12. Select [On] and press the ENTER key.
Note 1: To disable an alarm, select [Off] at
step 12 in the above procedure.
Note 2: The default alarm settings can be re-
stored. Open the [Fish Alarm] setting window,
select [Reset?], press the ENTER key, select
[Yes] and press the ENTER key.
Fish School
alarm
Bottom Fish
alarm
Alarm marker
- Fish School, Bottom: Right side
- Bottom lock: Center
Starting
depth
Alarm range
(width from
starting depth)
Fish School
alarms
Bottom Fish
alarm