Furuno FE-700 User manual

NAVIGATIONAL ECHO SOUNDER
FE-700

Your Local Agent/DealerYour Local Agent/Dealer
9-52 Ashihara-cho,9-52 Ashihara-cho,
Nishinomi
y
a 662-8580, JAPANNishinomi
y
a 662-8580, JAPAN
Tele
p
hone :Tele
p
hone : 0798-65-21110798-65-2111
FaxFax 0798-65-42000798-65-4200
::
F
IRST EDITION :
F
IRST EDITION : JANJAN.. 20002000
Printed in JapanPrinted in Japan
A
ll ri
g
hts reserved.
A
ll ri
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hts reserved. QQ ::DECDEC.. 15, 200415, 2004
Pub. No.Pub. No. OME-23660OME-23660
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(( YOSHYOSH )) FE-700FE-700 * 0 0 0 8 0 8 9 0 8 0 4 ** 0 0 0 8 0 8 9 0 8 0 4 *
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i
SAFETY INSTRUCTIONS
Do not power the equipment when the
transducer is in air.
The transducer may become damaged.
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, how-
ever this is not an indication of malfunc-
tion.
About the TFT LCD
WARNING
Immediately turn off the power at the
switchboard if water leaks into the
equipment.
Continued use of the equipment can cause
fire or electrical shock. Contact a FURUNO
agent for service.
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury can
result.
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.
Make sure no rain or water splash leaks
into the equipment.
Fire or electrical shock can result if water
leaks in the equipment.
Use the proper fuse.
Use of a wrong fuse can result in equipment
damage and void the warranty.
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel
should work inside the
equipment.
WARNING LABEL
A warning label is attached to the equip-
ment. Do not remove the label. If the
label is missing or illegible, contact
a FURUNO agent or dealer.
WARNING
To avoid electrical shock, do not
remove cover. No user-serviceable
parts inside.
Name: Warning Label (1)
Type: 86-003-1011-1
Code No.: 100-236-231
CAUTION

ii
RECORD OF MODIFICATIONS IN THIS OPERATOR’S MANUAL
Pub No. Software (Prog No.) Outline of changes in Operator’s manual
Publicized for
submission to
type test by BSH
(Feb/2000)
Display Unit
02522970-01
Digital Depth Indicator
65-5-0100-001
displayed at switch-on
(Subject to change by the type approval authorities.)
(Subject to change by the type approval authorities.)
OME-23660-F
Dec/2000
Digital Depth Indicator
65-5-0100-003
Changed [Unit] key to [*] and the related part of software.
OME-23660-G
Apr/2001
Display Unit
02522970-02
(Serial no. 2232-0618 and
after)
Added TRANSDUCER SETTING option in the
EXTENSION MODE menu.
Added KEEL DISTANCE option in the SYSTEM MENU3.
OME-23660-H
May/2001
---- Modified errors.
OME-23660-K
Apr/2002 Display Unit
02522970-03 Modified to conform with IEC 61162-1 Edition 2.
OME-23660-Q
Dec/2004
Display Unit
02522970-04 Deleted KEEL DISTANCE option in the SYSTEM MENU3.
Changed draft setting range from “0 to 30 m” to “-10 to
30 m”.

iii
CONTENTS
FOREWORD .........................................iv
A Word to FE-700 Owners........................... iv
Features..................................................... iv
SYSTEM CONFIGURATION..................v
SPECIFICATIONS OF FE-700 ….....SP-1
1 OPERATION.....................................1
1.1 Control Description................................1
1.2 Indications, Markers..............................2
1.3 Turning On/Off ......................................3
1.4 Tone and Brilliance................................3
1.5 Panel Dimmer.......................................3
1.6 Display Mode........................................4
1.7 Range Scale.........................................7
1.8 Gain Control..........................................7
1.9 Automatic Operation .............................7
1.10Picture Colors.......................................7
1.11Shallow Depth Alarm.............................8
1.12Draft......................................................8
2 MENU OPERATION..........................9
2.1 Menu Overview.....................................9
2.2 Suppressing Low Level Noise ...............9
2.3 Suppressing Interference ......................9
2.4 Picture Advance..................................10
2.5 Trend..................................................10
2.6 Interval................................................10
3 SYSTEM MENU.............................. 11
3.1 System Menu...................................... 11
3.2 System Menu 1...................................12
3.3 System Menu 2...................................12
3.4 System Menu 3................................... 13
4 ECHO QUALITY SETTING.............14
4.1 Demonstration Display........................ 14
4.2 Transducer Setting.............................. 14
4.3 Bottom Level....................................... 15
4.4 TVG Level.......................................... 15
4.5 Echo Offset......................................... 15
5 OPERATION OF DIGITAL DEPTH
INDICATOR FE-720 (OPTION).......16
5.1 Basic Operation................................. 16
5.2 Menu Operation ................................ 17
5.3 Diagnosis.......................................... 18
5.4 Factory Setting.................................. 18
6 MAINTENANCE,
TROUBLESHOOTING....................19
6.1 Checking............................................ 19
6.2 Cleaning the Display Unit.................... 19
6.3 Transducer Maintenance..................... 19
6.4 Replacing the Fuse, Battery................ 19
6.5 Troubleshooting.................................. 20
6.6 Diagnostic Test ................................... 21
6.7 Test Pattern........................................ 21
6.8 Clearing the Memory........................... 22
7 MENU TREE...................................23
8 DIGITAL INTERFACE (IEC 61162-1
EDITION 2).....................................24
9 PARTS LOCATION, PARTS LIST ..32
Declaration of Conformity

iv
FOREWORD
A Word to FE-700 Owners
Thank you for purchasing this navigational echo
sounder. We are confident you will discover why
FURUNO has become synonymous with quality
and reliability.
Dedicated in the design and manufacture of
marine electronics equipment for half a century,
FURUNO Electric Company has gained an
unrivaled reputation as a world leader in the
industry. This is the result of our technical
excellence as well as our worldwide distribution
and service network.
Please carefully read and follow the safety
information and operating and maintenance
instructions set forth in this manual before
attempting to operate the equipment and
conduct any maintenance. Your navigational
echo sounder will perform to the utmost of its
ability only if it is operated and maintained in
accordance with the correct procedures.
This equipment is designed, produced and
documented by FURUNO ELECTRIC CO., LTD.,
complying with ISO 9001 standards as certified
by the Lloyd’s Register of Quality Assurance
System.
Features
The FURUNO FE-700 is comprised of display
unit and transducer unit. Echo sounding data is
displayed on the bright 6.5-inch color TFT (Thin
Film Transistor) LCD display.
The main features of the FE-700 are
1. Complies with the IMO and ISO standards
MSC.74(69) Annex 4 and ISO9875.
2. Cost-effective; no paper, no consumables;
high accuracy and high reliability - no rotating
gears and belts as in the paper echo
sounders
3. High-contrast 6.5-inch color LCD display
featuring a wide viewing angle and adjustable
brightness.
4. Wide variety of modes with never-get-lost
default position.
5. Automatic function permits unattended
adjustment of range, gain, and pulselength.
The range scale and gain automatically
change to display the bottom.
6. Position, course, speed, time are repeated
from the external devices.
7. Alarms: shallow water, bottom lost, power
drop

v
SYSTEM CONFIGURATION
TRANSDUCER
DISTRIBUTION
BOX
FE-702
DISPLAY UNIT
FE-701
JUNCTION BOX
JIS F8821-1
MATCHING BOX MB-502 (for 50B-6B)
MB-504 (for 200B-8B)
JB JB
IEC 61162-1
EIA-232C
IEC 61162-1 Navigation Device
Navigation Device
Personal Computer
IEC 61162-1
JB
TRANSDUCER SWITCH BOX
EX-8
DIGITAL DEPTH INDICATOR
FE-720
CONTACT CLOSURE Alarm Unit
: Standard Supply
Ship’s mains
100-115 VAC/200-230 VAC
or
24 VDC
: Optional Supply
TERMINAL BOX
DS-802
: Local Supply
FE-700 system configuration
PRINCIPLE OF OPERATION
The FE-700 uses ultrasonic pulses to detect the seabed and other underwater objects. The display unit
contains all basic electric circuits and logic processor. Electrical pulses are converted into acoustical
energy in the transducer fitted on the ship’s hull. The processor measures the time of pulses travelling
between the seabed and transducer and displays the water depths in the graphical form or other forms.
The transducers have a specific beam width with respect to their working frequency, 50 kHz or 200 kHz.
The high frequency has a narrow beamwidth and is immune to aeration when the ship is going astern or in
rough weather. The low frequency has a wide beamwidth and more powerful sounding capability.

SP - 1 E2366S01Q
SPECIFICATIONS OF NAVIGATIONAL ECHO SOUNDER
FE-700
1 DISPLAY UNIT
1.1 Graphical Display 6.5-inch color TFT LCD, 320 x 234 pixels
1.2 Echo Colors 8 colors or 8 level monochrome
1.3 Display Area 133 x 97 mm
1.4 Basic Display Range
Range
Unit 1 2 3 4 5 6 7 8
Meters 5 10 20 40 100 200 400 800
Feet 15 30 60 120 300 600 1500 2500
Fathoms 3 5 10 20 50 100 200 400
*Default settings; it could be customized for use w/o range 3 and 6.
1.5 Accuracy ±2.5% on any range
1.6 Minimum Range 0.5 m (200 kHz), 2.0 m (50 kHz)
1.7 Draft -10 to 30 m in 0.1 m steps, default 0 m
1.8 Pulse Repetition Rate (PRR)
Depth (m) P/L (ms) PRR (pulse/min)
5, 10, 20 0.25 750
40 0.38 375
100 1.00 150
200 2.00 75
400,800 3.60 42
1.9 Display Mode “NAV”: Basic echo presentation with the depth below transducer
“DBS”: Echo presentation with the depth below sea surface (or keel)
“HISTRY”: Historical Echo presentation with the depth
“LOGBOOK”: Echo presentation with the pop-up table showing
Time, Depth and L/L* data memorized at preset interval
“OS DATA”: Echo presentation with the pop-up table of present
navigational data; L/L*, course*, speed*, time, depth
“HELP”: Echo presentation with the help menu and note
“MENU”: Echo presentation with the user menu
1.10 Picture Advance Speed
Slow mode 15 minutes or more
Fast mode Picture advance range
Range (m) 5 10 20 40 100 200 400 800
Interval (min.) 1.8 8 20 30

SP - 2 E2366S01Q
1.11 User Setting Gain, Range, Alarm, Draft, Brilliance, Dimmer, Color, Auto
1.12 Auto Set Mode Gain, range and clutter will be automatically adjusted.
1.13 Alarm Shallow water (default 20 m), Bottom lost, Power drop
1.14 Logbook Display Depth, Internal clock, L/L*
1 hour at 5 sec Interval, 12 hours at 1 minute interval and 24
hours at 2 minutes interval
*: External navigational sensor required.
2 TRANSCEIVER CHARACTERISTICS (BUILT IN DISPLAY UNIT)
2.1 Transmit Frequency 50 kHz or 200 kHz
2.2 Output Power 600 Wrms
3 DIGITAL DEPTH INDICATOR
3.1 Display 4.5-inch monochrome LCD
3.2 Depth Indication **.* m (less than 100m)
**** m (100 m or more)
3.3 Power supply 24 VDC, 150mA
3.4 Coating color Panel: N3.0, Chassis: 2.5GY5/1.5
3.5 Waterproofing IPX5
4 TRANSDUCER TYPE AND BEAMWIDTH
4.1 50B-6B (50 kHz): 35°
4.2 200B-8B (200 kHz): 6°
5 INTERFACE
5.1 Serial Input Data IEC61162-1, current loop; 1 port
RMA: L/L, ground track speed, Track
RMC: L/L(GPS), ground track speed, Track, Time
GLL: L/L
GGA: L/L
VTG: Ground track speed,
Track (True/Magnetic selected on menu)
ZDA: Time
5.2 Serial Output Data IEC61162-1, output period: 1 sec.; 3 outputs/
1 port
SDDPT: Depth (m), Draft (m)
SDDBT: Depth (ft, m, fa) below transducer
SDDBS: Depth (ft, m, fa) below sea surface
5.3 Serial I/O Data RS-232C, 1 port
Output Depth, clock, L/L, ship’s speed, course

SP - 3 E2366S01Q
Input Control command for PC
5.4 Alarm (Depth, Power) Contact closure signal, normal open or normal close,
250 VAC/ 200 VDC, 3A max.
6 POWER SUPPLY
24 VDC (-10%, +30%): 20W or
100-115/200-230 VAC, 1 phase, 50/60Hz: 20VA.
7 ENVIRONMENTAL CONDITION
7.1 Temperature -15 °C to +55 °C
7.2 Relative Humidity 93% or less at 40 °C
7.3 Waterproofing Display Unit: IEC IPX5
Distribution Box: IEC IPX2
Matching Box: IEC IPX2
7.4 EMC Emission IEC 60945 Ver.3
7.5 Category of Equipment Units
Display Unit protected from the weather
Distribution Box protected from the weather
Matching Box protected from the weather
Transducer Submerged area
8 COATING COLOR
8.1 Display Unit Panel: N3.0, Chassis: 2.5GY5/1.5
8.2 Distribution Box/ Matching Box
2.5GY5/1.5

1
1 OPERATION
1.1 Control Description
All operation of the FE-700 is carried out with the controls on the front panel of the display unit. Rotary
controls respond immediately to your command but some touch keys require the successive operation.
•
•
•

2
1.2 Indications, Markers
Auto
mode
Range setting
Gain setting
Display mode
Depth alarm line
Depth
Explanation of depth
(Below transducer, or
below surface)
Alarm
setting Range scale
Control panel
Screen
ALARM 15m
AUTO
RANGE: 4
GAIN: 5.5
MODE: NAV
Depth unit
NAV
DBS
LOGBOOK
OS DATA
HELP
MENU
HISTO Y
FORE 50kHz
Transducer in use ( when using
transducer switch box. )

3
1.3 Turning On/Off
1. Turning on: Press the POWER Switch.
Self-test starts, showing the condition of the
logic circuits. The program number is
displayed.
ROM: OK
DRAM: OK
SRAM: OK
BATTERY: OK
PROGRAM NO. 0252297002
2. Select a mode with the MODE Selector. The
NAV position of the selector is recommended
for general use. Display color is amber by
default but may be customized. The unit of
measurement is meters. You can freely
select another mode at any time.
3. Turning off: Press the POWER Switch
again.
Wait at least 5 s before reapplying the power.
Note: When two transducers are installed, make
sure which transducer is used.
Note: When lat/long data input error occurs,
“EPFS” ERROR appears on the screen.
(EPFS: Electronic Position-Fixing System
such as GPS receiver)
1.4 Tone and Brilliance
1. Press the BRILL key. The tone and brilliance
setting window appears.
LOW ▼▲HIGH
BRILL: 8
LOW - +HIGH
TONE: 3
2. Press the [+] or [ - ] key for desired tone (in
reality, Contrast).
3. Press the [▲] or [▼] key for desired
brilliance. Pressing the BRILL key also
changes the brilliance from minimum to
maximum and vice-versa.
Note: Tone or brilliance must be adjusted within
10 seconds after pressing the BRILL key.
Otherwise the tone and brilliance window
will be erased.
1.5 Panel Dimmer
1. Press the DIM key. The panel dimmer setting
window appears.
LOW
- +HIGH
DIMMER: 5 
2. Press the [+] or [ - ] key for desired
illumination of the control panel. Pressing
DIM key also changes the illumination level.

4
1.6 Display Mode
The Mode Selector choose the display mode
among NAV, DBS (depth below surface),
HISTORY, LOGBOOK, OS DATA, HELP, and
MENU.
1.6.1 NAV mode
The depth from the transducer to the seabed
(bottom clearance) is shown on the screen. Note
“BELOW TRANSDUCER” appears at the bottom
of the screen in this mode.
Default is,
Color: Amber
Range: Automatic range switching
Window: 15 minutes
Shallow depth alarm: 20 m
NOTE: These parameters can be customized to
your preference and the last setting is used at a
next switch-on. This is true on all other modes.
1.6.2 DBS mode
The Depth Below Surface mode provides a
draft-adjusted depth reading and will be useful in
referencing to the nautical chart. The draft should
be adjusted by the DRAFT key according to the
actual draft value. If you find any difficulty to
check for the draft value, use the NAV mode.
When the DBS mode is selected, the message
“Confirm and set ship’s draft to use DBS mode”
appears. Confirm ship's draft and set it by
referring to section 1.12.
BELOW KEEL (when the draft setting is –10.0 to
–0.1) or BELOW SURFACE (when the draft
setting is 0 to 30.0) appears at the bottom of the
display and the draft value appears at the upper
right-hand corner in the DBS mode.
CAUTION
DBS is not a water clearance below
keel.
Do not use this mode in shallow
waters to avoid grounding.
1.6.3 HISTORY mode
This mode provides a mix of Contour and Strata
displays. The Contour display can be scrolled
over the past 24 h while the right side Strata
display (layers of different colors according to
reverberation strengths) shows the latest
sounding for 5 minutes.
Pressing the [+] or [
- ] key moves the Contour
display forwards or backwards, respectively.
History of the bottom
MENU
HELP
OS DATA
LOGBOOK
HISTORY
DBS
NAV
HISTORY
If the range scale for both the Contour and Strata
display must be the same. If they are not, the
message “OUT OF RANGE” appears.
The update of the contour data may take max.
one minute. Wait for one minute to display
accurate contour if you change the range scale.

5
1.6.4 LOGBOOK mode
The LOGBOOK shows time, depth and own ship
position in tabular form in a pop-up window. The
logging is selected with the INTERVAL option on
the menu among 5 s, 1 min and 2 min. (See
section 2.6.)
There are 60 pages and the total memory
capacity is 720 points. Page 60/60 is the latest
data and 1/60 is the oldest data. Pressing [
- ] or
[+] key changes the pages.
60/60
TIME DEPTH L/L
11:00:00 47.5
36°55.012’N
135°23.123’E
11:01:00 47.5 36°55.012’N
135°23.123’E
11:02:00 47.5 36°55.013’N
135°23.123’E
11:03:00 47.5 36°55.013’N
135°23.123’E
11:04:00 47.5 36°55.014’N
135°23.123’E
11:05:00 47.5 36°55.014’N
135°23.123’E
1.6.5 OS DATA mode
This display mode indicates own ship position,
GPS-derived course and speed, and time and
depth in digital form. You can read the data of
your particular interest in large characters. The
screen continues to display the sounding data in
the background. Part of graphical indication is
visible to the right of data slips.
BT means Bottom track
T UE(true course) or
MAG (magnetic course) appears.
OS DATA
NAV
DBS
LOGBOOK
OS DATA
HELP
MENU
HISTO Y
N
E
There are two kinds of OS DATA displays: DATA
1 and DATA 2, as selected on the system menu.
DATA 1 is the default setting, and it is shown in
the figure above.
The DATA 2 display is as below.
TIME UTC
11:23:45
DEPTH
172 m
Note: When lat/long data input error occurs in
the DATA 1 mode, “EPFS” ERROR
appears on the screen. (EPFS: Electronic
Position-Fixing System such as GPS
receiver)

6
Enlarging data of interest
You can enlarge one of the data indications as
follows:
1. Press the [▲] or [▼] key to select the data
you want to enlarge. Current section is
circumscribed with the blue cursor. For
example, select the depth cell.
2. Press the [+] key.
DEPTH
172 m
3. To return to the original display, press the [ - ]
key.
1.6.6 HELP display
This mode provides information about keys.
Press desired key to obtain the corresponding
information. The example below shows help
information for MUTEALARM.
HELP MENU
DRAFT MUTE ALARM
DIM BRILL
AUTO COLOR
- +
PRESS KEY.
MUTE ALARM
To set or
acknowledge alarms:
1. Press MUTE ALARM key.
2. Press [
- ] or [+]
key to set alarm
depth.
3. Press MUTE ALARM
key to silence
the alarm.
PRESS KEY.
1.6.7 MENU display
The menu provides functions which normally do
not require frequent adjustment. For details see
Chapter 2.
CLUTTER
9 (0∼16)
INTERFERENCE REJECT
OFF IR1 IR2 IR3
PICTUREADVANCE
SLOW FAST
TRENDINDICATOR
OFF ON
INTERVAL
5 s 1 min 2 min
1/2
▼▲: To select item
- +: To set option
Press the [▼] key, and the following appears.
CAUTION!
SYSTEM MENU IS ONLY
FOR INSTALLATION. DO
NOT CHANGE SETTINGS.
GO TO SYSTEM MENU?
NO YES
2/2
▲: To select item
- +: To set option

7
1.7 Range Scale
If the depth goes out of the correct display area,
increase or decrease the range until the seabed
appears near the center of the screen.
Adjust the Range Control, and current range
selection is shown in the range display window.
RANGE 5 m
In the AUTO mode, the range scale is
automatically adjusted. See section 1.9 for
details.
1.8 Gain Control
The GAIN Control adjusts the sensitivity of the
receiver. The AUTO mode provides automatic
adjustment and you are normally not required to
adjust it. Current setting is shown at the upper
left-hand corner. Adjust the GAIN Control and the
following window appears.
GAIN 5.5
Adjust the GAIN Control so that a slight amount
of noise remains on the screen. Generally, use a
higher gain setting for greater depths and a lower
setting for shallower waters. Adjusting range is
between 0.0 and 10.0 in 0.5 steps.
1.9 Automatic Operation
The automatic function automatically selects the
proper gain, range scale and clutter level
according to depth. It works as follows:
• The range changes automatically to locate the
bottom on the lower half of the screen. It jumps
to one step shallower range when bottom
echoes reach a halfway point of the full scale
from top and to one step deeper range when
they come to the lower edge of the scale.
• The gain is automatically adjusted to display
the seabed in specified color.
• Clutter level (on the menu), which works as a
threshold control to suppress overall noise, is
automatically adjusted.
Note: The AUTO MODE is cancelled whenever
the range or the gain is changed.
How to enable/disable automatic
operation
1. Press the AUTO key. The AUTO mode
window appears.
AUTO MODE
OFF ON
- / +: To set option
2. Press the [+] key to select ON or the [ - ] key
to select OFF.
1.10 Picture Colors
1. Press the COLOR key. The following window
appears.
COLOR
- 1 2 3 4 5 6 7 8 9 +
2. Press the [+] or [ - ] key to select a number,
referring to the table below. (You can see the
result of your selection on the display.)
Background Seabed Others marks
1 Monochrome, 8 intensities
2 Blue Red infill 6 colors
3 Black Red infill 6 colors
4 White Red infill 6 colors
5 Blue Yellow infill 6 colors
6 Black Yellow infill 6 colors
7 White Yellow infill 6 colors
8 Black 7 colors (Strata)
9 White 7 colors (Strata)

8
Monochrome (amber) is the default setting. The
Strata display contains multiple colors depending
on the reflectivity from underwater objects of the
sounding pulses. Red is strongest, followed by
brown, orange, yellow, blue, and light blue.
1.11 Shallow Depth Alarm
The shallow depth alarm sounds when the
seabed is shallower than the preset depth. The
default in the NAV position is 20 m. You can
adjust the alarm depth as below:
Activating/deactivating the alarm
1. Press the MUTE ALARM key to display the
depth alarm setting window.
DEPTHALARM
10 m
- / +: To set option
2. Press the [+] or [ - ] key to change setting
depth. The setting is shown digitally at the
top of the screen and graphically key the
depth alarm line.
When the alarm is activated, the message
“SHALLOW DEPTH ALARM” is displayed at the
center on the screen.
Note: When the draft setting is –10.0 to –0.1
in the DBS mode, the shallow depth alarm setting
will show a minus value.At this time, the alarm
setting value indication shows “****” and the
alarm function is disabled.
Acknowledging the alarm
You can silence the alarm by pressing the MUTE
ALARM key. The message “SHALLOW DEPTH
ALARM” moves to upper side of the screen.
1.12 Draft
It is necessary to set the draft to use the DBS
display mode, which shows depth below surface.
1. Select DBS with the MODE control.
“Confirm and set ships draft to use DBS
mode.” appears.
2. Press the DRAFT key to display the draft
setting window.
0.0 m
-/+:To set option
3. Press the [+] key to increase the setting
depth and [
- ] key to decrease it. The setting
depth is -10 to 30 m in steps of 0.1 m.
The above window disappears in 10 seconds.
The draft setting is displayed at the upper right
corner and the range scale is shifted according to
the draft setting.

9
2 MENU OPERATION
2.1 Menu Overview
The menu has several functions for advanced
operation.
1. Select MENU with the MODE Selector.
CLUTTER
AUTO (0∼16)
INTERFERENCE REJECT
OFF IR1 IR2 IR3
PICTUREADVANCE
SLOW FAST
TRENDINDICATOR
OFF ON
INTERVAL
5s 1min 2min
1/2
▼▲: To select item
- +: To set option
2. Press the [▲] or [▼] key to select menu
item. As you operate the [▲] or [▼] key, the
selected item and its current setting appear
in reverse video.
3. Press the [ - ] or [+] key to select option
desired.
4. Set the MODE Selector in another position
to close the menu.
2.2 Suppressing Low Level
Noise
Light-blue dots may appear overall screen. This
is mainly due to dirty water or noise. This noise
can be suppressed by adjusting CLUTTER (in
reality, Threshold of the amplifier).
When the automatic mode is on, the
suppression setting is automatically adjusted.
For manual override, do the following:
1. Select MENU with the MODE Selector.
2. Select CLUTTER by pressing the [▲] key.
3. Press the [ - ] or [+] key to select clutter
rejection level desired. The higher the
number the higher the degree of
suppression. Note that weak echoes may
not be displayed when the clutter circuit is
on.
2.3 Suppressing Interference
Interference from other acoustic equipment
operating nearby or other electronic equipment
on your boat may show itself on the display.
To suppress interference, do the following:
1. Select MENU with the MODE Selector.
2. Select INTERFERENCE REJECT by
pressing the [▲] or [▼] key.
3. Press the [ - ] or [+] key to select degree of
suppression desired; OFF, IR1, IR2 or IR3.
The higher the number the greater the
degree of suppression.
Note that oversuppression will weaken the
sensitivity.

10
2.4 Picture Advance
The picture advance speed determines how
quickly the vertical scan lines run across the
screen.
1. Select MENU with the MODE Selector.
2. Select PICTURE ADVANCE by pressing the
[▲] or [▼] key.
3. Press the [+] or [ - ] key to select speed
FAST or SLOW, respectively. The advance
speed varies with the range scale and the
viewing length of 15-16 minutes is available
on all ranges (IMO requirements).
Range (m) Display window (minute)
5, 10, 20 1.8/15 (FAST/SLOW)
40,100 8/15
200 15/20
400, 800 15/30
2.5 Trend
The future trend of the seabed depths can be
predicted over a specified period of time (See
page 13). The trend index is set with the item
TREND and appears at the top left corner. The
default setting is ON.
θis inclination angle of bottom.
−2°≤θ≤2° 2°<θ≤10° 10°<θ≤45° 45°<θ≤90°
−2°>θ≥−10° −10°>θ≥−45° −45°>θ≥−90°
2.6 Interval
The interval for sampling data for the
LOGBOOK and HISTORY modes can be set
with INTERVAL, among 5 s, 1 min and 2 min.
The default setting is 1 min.
3/60
TIME DEPTH L/L
11:00:00 47.5 36°55.012’N
135°23.123’E
11:01:00 47.5 36°55.012’N
135°23.123’E
11:02:00 47.5 36°55.013’N
135°23.123’E
11:03:00 47.5 36°55.013’N
135°23.123’E
11:04:00 47.5 36°55.014’N
135°23.123’E
11:05:00 47.5 36°55.014’N
135°23.123’E
In this example, the setting of INTERVAL is
1 minute. That is, the depth and lat/long data are
displayed at 1 minute intervals.