Furuno CH250 User Manual
COLOR LCD SEARCHLIGHT SONAR
Back
CH-250
C
All rights reserved.
PUB. No. OME-13160
CH- 250
( DAMI )
FIRST EDITION : MAR. 2000
9-52, Ashihara- cho,
Nishinomiya, Japan
Telephone: 0798-65-2111
Telefax: 0798-65-4200
Printed in Japan
Your Local Agent/Dealer
K2 : OCT. 3, 2002
SAFETY INSTRUCTIONS
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel
should work inside the
equipment.
Immediately turn off the power at the
switchboard if water leaks into the
equipment or something is dropped in
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.
WARNING
Keep heater away from equipment.
A heater can melt the equipment's power
cord, which can cause fire or electrical
shock.
Use the proper fuse.
The fuse in the hull and transceiver units
protect them from overvoltage, equipment
fault and reverse polarity of the ship's
mains. If a fuse blows replace it with fuse of
the same amperage. Use of a wrong fuse
can result in equipment damage.
Retract the transducer before turning
off the power.
Damage to the equipment may result.
Wait until the transducer switch [
steadily and then turn off the power.
↑
] lights
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.
i
CAUTION
CAUTION
Do not exceed 20 knots when operating
the equipment and do not exceed 15
knots when lowering or raising the
transducer.
The transducer may become damaged.
Do not use the equipment for other
than its intended purpose.
Use of the equipment as a stepping stool,
for example, may result in personal injury
or equipment damage.
Warning labels are attached to the
display, transceiver and hull units. Do
not remove the labels. If a 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.
WARNING
Moving shaft can pinch and cut.
Keep hands clear while operating.
Lockout power before servicing.
Name: Warning Label (1)
Type: 86-003-1011-0
Code No.: 100-236-230
DISPLAY UNIT,
TRANSCEIVER
UNIT
Name: "Finger Catch"
Warning Label
Type: 06-021-4015-0
Code No.: 100-281-590
WORKING WITH THE SONAR OIL
Precautions
n
Keep oil away from eyes. Wear protective gloves when working with the oil.
The oil can cause inflammation of the
eyes.
n
Do not touch the oil. Wear protective
gloves when working with the oil. The
oil can cause inflammation of the skin.
n
Do not ingest the oil. Diarrhea and
vomiting may result.
n
Keep the oil out of reach of children.
Emergency procedures
n
If the oil enters eyes, flush with clean
water about 15 minutes. Consult a
physician.
n
If the oil is ingested, see a physician
immediately.
Disposal of oil and its container
Dispose of oil and its container in accordance with local regulations. For further
details, contact place of purchase.
Storage
Seal container to keep out foreign material.
Store in dark, cool place.
HULL UNIT
TFT LCD
The high quality TFT (Thin Film Transistor)
LCD displays 99.999% of its picture elements. The remaining 0.01% may drop out
or light, however this is an inherent property
of the LCD; it is not a sign of malfunction.
ii
TABLE OF CONTENTS
FOREWORD..............................................................................................v
SYSTEM CONFIGURATION....................................................................vii
1. OPERATIONAL OVERVIEW
1.1 Control Description...................................................................................................1-1
1.2 Remote Controller.....................................................................................................1-2
1.3 Turning the Power On/Off ......................................................................................... 1-3
1.4 Raising, Low ering the Transducer.............................................................................1-4
1.5 Adjusting Screen Brilliance, Panel Dimmer...............................................................1-5
1.6 Selecting a Display...................................................................................................1-6
1.7 Adjusting th e Gain ....................................................................................................1-7
1.8 Basic Menu Operation..............................................................................................1-7
2. HORIZONTAL MODE
2.1 Operational Overview ...............................................................................................2-1
2.2 Typical Horizontal Mode Display...............................................................................2-2
2.3 Selecting th e Range .................................................................................................2-3
2.4 Selecting Sector Width..............................................................................................2-4
2.5 Selecting Train Ce n te r..............................................................................................2-5
2.6 Selectin g the Tilt Angle.............................................................................................2-5
2.7 Selecting the T rai ning Speed....................................................................................2-9
2.8 Finding Echo Position with the Cursor ......................................................................2-9
2.9 Event Marker..........................................................................................................2-10
2.10 Range and Bearing Markers.................................................................................. 2-11
2.11Adjusting the Picture...............................................................................................2-12
2.12 Target Lock............................................................................................................2-17
2.13 Horizontal Menu Overview.....................................................................................2-21
2.14 Interpreting the Horizontal Display.........................................................................2-23
3. VERTICAL FAN MODE
3.1 Operational Overview ...............................................................................................3-1
3.2 Typical Vertical Fan Mode Display............................................................................3-2
3.3 Selecting th e Range .................................................................................................3-3
3.4 Selecting Train Ce n te r..............................................................................................3-4
3.5 Selecting Display Sector...........................................................................................3-5
3.6 Selecting Sector Center............................................................................................3-6
3.7 Selecting the T rai ning Speed....................................................................................3-7
3.8 Finding Echo Position with the Cursor ......................................................................3-7
3.9 Event Marker............................................................................................................3-8
3.10 Depth and Horizontal Range Markers......................................................................3-9
iii
3.11Adjusting the Picture...............................................................................................3-10
3.12 Vertical Menu Overview.........................................................................................3-12
3.13 Interpreting the Vertical Fan Display ......................................................................3-13
4. ECHO SOUNDER MODE
4.1 Operational Overview ...............................................................................................4-1
4.2 Typical Echo Sounder Display ..................................................................................4-2
4.3 Selecting th e Range .................................................................................................4-3
4.4 Train Direction..........................................................................................................4-4
4.5 Selectin g Tilt Angl e...................................................................................................4-4
4.6 Selecting Picture Advance Speed.............................................................................4-4
4.7 Measuring Range by Cursor.....................................................................................4-5
4.8 Event Marker............................................................................................................4-5
4.9 Range Marker...........................................................................................................4-7
4.10 Adjusting the Picture................................................................................................4-7
4.11Echo Sounder Menu Overview................................................................................4-10
5. MENU OPERATI O N
5.1 COMN Menu.............................................................................................................5-1
5.2 Short-cut Menu, Preset Menu...................................................................................5-3
5.3 SYS Menu ................................................................................................................5-7
6. MAINTENANCE, TROUBLESHOOTING
6.1 Preventive Maintenance ........................................................................................... 6-1
6.2 Cleaning the Equipment............................................................................................6-1
6.3 Hull Unit Maintenance...............................................................................................6-2
6.4 Transducer Maintenance..........................................................................................6-3
6.5 Fuse Replacement....................................................................................................6-3
6.6 Troubleshooting........................................................................................................6-4
6.7 Error Messages ........................................................................................................6-5
6.8 Diagnostics...............................................................................................................6-6
6.9 Test Pattern ..............................................................................................................6-8
MENU TREE..........................................................................................M-1
SPECIFICATIONS...............................................................................SP-1
INDEX
iv
FOREWORD
Thank you for purchasing the CH-250 Color LCD Searchlight Sonar. 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 sonar will perform to the utmost of its ability only if it is operated and
maintained in accordance with the correct procedures.
Features
The CH-250 displays underwater objects on a bright 10.4” color LCD display, in 8 or 16 colors
according to received echo strengths. Operating frequency is selectable among 60, 88 and 150
kHz. Eight operating modes provide information for virtually any fishing application.
The main features of the CH-250 are
•
High definition active matrix color LCD.
•
Target lock on a fish school or stationary position (reef, etc.).
•
Audible detection of echoes frees the operator from continuous watch of the display.
•
Compact display and hull units permit installation where space is limited.
•
Interface IF-8000 permits use of a commercial monitor instead of standard display unit.
•
Automatic pulselength switching for optimum performance in short and long ranges.
•
Eight operational modes: Horizontal, Expanded Horizontal, Vertical Fan, Echo Sounder,
Horizontal/Vertical Fan, History, Video Plotter and Strata.
•
Automatic retraction of transducer at operator-selected ship’s speed between 5 and 15 knots.
•
CUSTOM MODE keys provide one-touch setup of the equipment or short-cut key function.
•
Tracing of ship’s track with connection of position-fixing equipment (GPS, etc.).
•
One of the echo strengths may be displayed in white to enhance the specific echo level.
v
Usage Precautions
•
The Motion Sensor MS-100 compensates for ship’s pitching and rolling. However, it does not
compensate for load unbalance.
•
If the equipment will not be used for a long time shut off the power to it at the mains
switchboard to prevent battery discharge.
•
If the soundome is to be operated while the ship is dry-docked set the transmitter output power
to “minimum” on the COMN menu. Damage to the train-tilt section may result if it is operated
with maximum transmitter power.
•
When the ship is dry-docked check for signs of corrosion on the soundome. Find the reason
for the corrosion and attach a zinc plate to the hull unit as an anticorrosion measure if
necessary.
vi
SYSTEM CONFIGURATION
INTERFACE UNIT IF-8000
Note 2
MONITOR UNIT MU-100C
Navigator
Control Unit
Display
Unit
VGA Ext.
Monitor
TRANSCEIVER UNIT
CH-253
HULL UNIT
SPEAKER
Speaker
DA T A/VIDEO OUT
Remote
Controller
CH-256
MOTION SENSOR
Motion Sensor
MS-100
12-32 VDC
12-32 VDC
Note 1
CONTROL UNIT CH-252
HULL UNIT
CH-254
CH-255
12/24-32 VDC
Note 1: MU-100C is the standard supply
monitor unit. An external monitor
may be connected via the
interface unit (option). The drawing
above shows the system configuration
with the MU-100C. The monitor unit and
control unit can be installed separately
(optional mounting kit required).
Note 2: For blackbox type, MU-100C is
not supplied. Connect external
monitor and control unit to the
interface unit.
vii
This page is intentionally left blank .
1. OPERATIONAL OVERVIEW
1.1 Control Description
Selects center bearing of training sector.
Selects detection range.
Switches training sector to 360˚
(horizontal mode), or 180˚ (vertical fan mode).
Turns the power on/off.
Raises the transducer.
XDR
POWER
Adjusts receiver
sensitivity.
Selects width of
training sector.
GAIN
SECTOR TRAIN
DISPLAYMODE
MAIN
SUB
RANGE
Selects scan speed/picture
advancement speed.
=
Controls tilt angle.
=
Selects center direction of
the vertical scanning sector.
TILT
FULL
FAST
SCAN
BRILL
HALF
CUSTOM MODE
Turns target lock on/off.
TARGET
Omnipad
=
Shifts cursor.
=
Selects menu items, options.
MENU
R/B
EVENT
Lowers the transducer.
Select display mode.
Horizontal/Video Plotter
Horizontal/History
Horizontal
Expanded Horizontal
Figure 1-1 Control unit
Provide short-cut
key or one-touch
setup.
Adjusts display
brilliance.
Alternately selects main
and sub windows in
combination displays.
Horizontal/Vertical Fan
Horizontal/Strata
DISPLAYMODE
Echo Sounder
Vertical Fan
Opens/closes
menu.
Inscribes/erases event
marker.
Inscribes/erases range
and bearing markers.
1-1
1.2 Remote Controller
The Remote Controller CH-256 (option) provides armchair control over range, tilt, target lock and
range of sounding.
Select tilt angle.
Select display
range.
Selects range of sounding
for full circle 360˚ (horizontal mode)
or half circle 180˚ (vertical fan mode).
Enables/disables
target lock.
Figure 1-2 Remote controller
Note:
The remote controller can also be used with a commercial monitor.
1-2
1.3 Turning the Power On/Off
1.3.1 Power on
This sonar has a demonstration mode which lets the operator become acquainted with the
features of the sonar, without connecting the transducer. For further details see page 5-18.
Press the [POWER] switch on the control unit till hear “click.” A beep sounds, the lamp above
the switch lights and the last-used display appears.
Note: Wait at least five seconds before reapplying the power.
1.3.2 Power off
1. Press the [↑] switch on the control panel. The lamp above the switch blinks while the
transducer is being raised and lights steadily when it is fully raised.
30
25
2. Press the [POWER] switch after the [↑
Transducer status indicator
• Up arrow is filled when transducer
has been retracted into the tank.
• Down arrow is filled when transducer
has been fully lowered.
• Appropriate arrow flashes during
raising/lowering of transducer.
NOTE: When the transducer is being
raised automatically (auto raise feature),
the arrows are filled and the up arrow
flashes. When the transducer has been
fully retracted, the up arrow lights
and the down arrow becomes hollow.
]
switch lights steadily.
Note 1: The transducer is automatically retracted into the tank if the [POWER] switch is
pressed before retracting the transducer. However, for safety purposes, make it a habit
to retract the transducer before turning off the power.
Note 2: After changing settings, wait at least one minute before turning off the equipment to
allow the equipment to memorize settings, and start up with them at the next powering
of the equipment. No harm will result to the equipment if this not done.
1-3
1.4 Raising, Lowering the Transducer
1.4.1 Lowering the transducer
With the boat at the fishing ground, press the [↓] switch to lower the transducer. The lamp above
the switch blinks while the transducer is being lowered and lights when it is completely lowered.
The down arrow of the transducer status indicator at the top right corner of the display is filled
when the transducer is completely lowered.
CAUTION
Do not exceed 20 knots when operating
the equipment and do not exceed 15
knots when lowering or raising the
transducer.
The transducer may become damaged.
1.4.2 Raising the transducer
Press the [↑] switch to raise the transducer. The lamp above the switch blinks while the
transducer is being raised and lights steadily when it is fully raised. The up arrow of the
transducer status indicator at the top right corner of the display is filled when the transducer is
fully retracted.
Note 1:
Note 2:
With speed input, the transducer can be raised automatically when the ship’s speed
exceeds a preset speed between 5 and 15 knots. If speed data is erroneous the
transducer may be raised at a speed different from the preset speed. For further details
about the automatic retraction feature, see AUTO RETRACTION on page 5-10.
An alarm may sound depending on ship’s speed. For details see page 5-11.
1-4
1.5 Adjusting Screen Brilliance, Panel Dimmer
Screen brilliance can be adjusted in nine steps and panel dimmer (backlighting) in four.
1. Press the [BRILL] key to open the dialog box for screen brilliance and panel dimmer. Do the
next step within four seconds, otherwise the dialog box will be erased.
BRILL:3
DIMMER:3
Figure 1-3 Brilliance, panel dimmer dialog box
2. Operate
continuous pressing of the [BRILL] key also changes the brilliance level.
3. Operate
4. Press the [MENU] key to register settings and close the dialog box. Note that the dialog box
is automatically erased if there is no control operation within about four seconds.
Note 1:
Note 2:
The brilliance of a commercial monitor cannot be adjusted with the [BRILL] key. Use the
associated control on the monitor.
For the supplied monitor unit, if you turn off the power with the brilliance set at minimum
the screen will show nothing at next power-up. In this case press the [BRILL] key several
times.
or to adjust screen brilliance (0 is the lowest brilliance; 9 the highest). Note that
or to adjust the panel dimmer (0 is the lowest level; 4 is the highest).
1-5
1.6 Selecting a Display
This sonar has eight display modes and you may select one with one of the DISPLAY MODE
keys. Refer to the chapter shown in the illustration for more information about each mode.
Key
Picture
NAV
DATA
HORIZONTAL
This mode provides 360 degree coverage.
Useful for general search. (Chapter 2)
NAV
DATA
VERTICAL FAN
Vertical section of underwater conditions
appears on the entire screen. (Chapter 3)
Key
Picture
NAV
DATA
EXPANDED HORIZONTAL
Zoomed horizontal picture appears over
the entire screen. (Chapter 2)
NAV
DATA
or
A-SCOPE
DISPLAY
Water temp/depth
ECHO SOUNDER
Using a fixed spot beam this display
shows fish echoes below or around the
vessel. (Chapter 4)
NAV DATA
HORIZONTAL/HISTORY
The horizontal picture appears in the main
window; the history picture in the sub
window. Useful for showing history of fish
movement, distribution. (Chapter 2)
NAV DATA
HORIZONTAL/VERTICAL FAN
The horizontal picture appears in the main
window; the vertical fan picture in the sub
window. (Chapter 3)
NAV DATA
HORIZONTAL/VIDEO PLOTTER
The horizontal picture appears in the main
window and the video plotter picture, which
traces ship's track, in the sub window.
(Chapter 2)
NAV DATA
HORIZONTAL/STRATA
The horizontal picture appears in the main
window; the strata picture in the sub window.
The strata picture shows bottom undulatons
in different colors. It is useful in bottom
trawling to avoid projections. (Chapter 2)
1-6
Figure 1-4
Display modes
1.7 Adjusting the Gain
The [GAIN] control adjusts the sensitivity of the receiver. Normally, the control is adjusted so that
the bottom echo is displayed in reddish-brown mixed with red. Initially set the gain between “4”
and “6” and then fine tune depending on fishing ground, etc.
Too Low Proper
Too High
Figure 1-5 How to adjust the gain
1.8 Basic Menu Operation
The menu, consisting of six menus, mostly contains items which once preset do not require
frequent adjustment. Below is the procedure for basic menu operation.
1. Press the [MENU] key to open the menu.
Note:
Either PRESET (default setting) or SHORT-CUT appears between ES and SYS at the
top of the screen depending on the setting of CUSTOM KEY on the SYSTEM
SETTING 1 menu, and they set the function of the custom keys [1], [2], [3]. For further
details see pages 5-3 through 5-7.)
MENU
WHITE MARKER
SIG LEVEL
COLOR 16
BKGD COLOR 1
TX POWER HIGH
PULSELENGTH LONG
TX RATE 10
INT REJECT
TRACK ON
COMN HORZ VERT ES PRESET SYS
OFF
OFF
OFF
: SELECT
: CHANGE
MENU: END
Figure 1-6 COMN menu
1-7
2. The last-used menu is displayed. (In Figure 1-6 the COMN (COMMON) menu is selected.)
To select a different menu, press
or to select menu desired.
to select MENU at the top of the screen and then press
3. Press
provided.
4. Press
BKGD COLOR (to choose background color) in the COMN menu.
Figure 1-7 Dialog box for background color
5. Press
or to lower or raise the figure, respectively.
6. Press
close the menu.
or to select menu item desired. At the bottom of the screen menu help is
to open the corresponding dialog box. The example below shows the dialog box for
BKGD COLOR
1 2 3
or to select option desired. If the option requires selection of numeric data, use
or to return to the menu, or press the [MENU] key to register your selection and
1-8
2. HORIZONTAL MODE
2.1 Operational Overview
The figure below shows the typical horizontal mode operating sequence.
7.
1.
Turn on the power.
6(a).
9.
Adjust gain.
XDR
Set center bearing of train
sector.
Set scanning sector.
5.
Set range.
8.
Set tilt angle.
11.
Adjust menu settings
(ex. TVG) as required.
POWER
2.
Lower the
transducer.
GAIN
4.
Select appropriate
SECTOR TRAIN
DISPLAYMODE
horizontal mode.
6(b).
Select training sector for
full circle.
Figure 2-1 Control panel
MAIN
SUB
RANGE
FULL
HALF
CUSTOM MODE
FAST
SCAN
TILT
BRILL
TARGET
MENU
R/B
EVENT
10.
Measure range and
bearing to target with cursor.
3.
Adjust screen
brilliance.
2-1
2.2 Typical Horizontal Mod e Display
* Depth marker
When depth data is input from
external equipment, the depth
marker shifts according to depth
data. If the depth data is greater
than the horizontal range, the
depth marker shifts to lowest position.
Demonstration
mode
Cursor data
Sector marker
Train indicator
Range and bearing markers
Tilt angle
Range
Horizontal max. range
Vertical max.
depth
Interference
rejector
Tilt angle indicator
(Indicates transducer tilt angle.)
30
25
Tilt angle
Depth marker*
(See note at
left.)
Bottom echo
Bearing marker
Fish echo
ETA marker
Own ship marker
Range marker
Event marker
Cursor
Event marker data
16
13
B208˚
+
W
16
B234˚
(DEMO)
Ship's
track*
N
S
Current vector*
R 40 m
T 40˚
34˚ 12. 343' N
134˚ 34. 213' W
CSE 357˚
SPD 9.9 kt
E
DEP 35 m
TMP 12.3˚C
CUR 11.0˚
2.0 kt
GAIN 5.3
TVG LEVEL 4.0
DISTANCE 200 m
9
COLOR
8
B7˚
Range and bearing
markers data
W
30
25
CUR 11.0˚
2.0 kt
North marker*
N
E
S
Transducer status indicator
Filled arrow: Respective action
completed
Blinking arrow: Action in progress
Target lock indicator
Position in latitude*,
longitude*
Course*, speed*
Depth,
water temperature*
Tide direction*,
tide speed*
Gain setting
TVG level,
distance settings
Color bar
* Requires appropriate
sensor.
Figure 2-2 Typical horizontal mode display
With the tilt angle lowered, your ship is at the center, the bottom, which appears in reddish-brown
color, is displayed as a circle and fish echoes appear within the circle.
2-2
2.3 Selecting the Range
The [RANGE] control selects the detection (display) range. Select the range according to either
the fish species being searched or the depth desired. 15 ranges are available and minimum and
maximum ranges depend on the transducer used.
SEA SURFACE
SEA SURFACE
Range indicated
on the screen.
BOTTOM
BOTTOM
Figure 2-3 How to select the range
Default horizontal mode range settings
Range indicated
on the screen.
Range
No.1 10 40 10 40 10 40
No.2 20 80 20 80 20 80
No.3 40 120 40 120 40 120
No.4 80 200 80 200 60 200
No.5 120 300 120 300 80 300
No.6 160 400 160 400 120 400
No.7 200 500 200 500 160 500
No.8 250 600 250 600 200 600
No.9 300 800 300 800 250 700
No.10 400 1000 400 1000 300 800
No.11 500 1500 500 1500 400 1000
No.12 600 2000 600 2000 500 1500
No.13 800 3000 800 2500 600 2000
No.14 1200 4000 1000 3500 800 2500
No.15 1600 5000 1200 4000 1000 3500
60 kHz 88 kHz 150 kHz
mftmftmft
Normally the range is set so that the bottom is traced at the lower part of the screen (like an echo
sounder). Each time the [RANGE] control is operated the newly selected range brie fly appears in
large characters at the screen top. Range is always displayed at the right-hand corner of the
screen.
Note 1:
Note 2:
Unit of range measurement may be selected for meters, feet, fathoms, passi/braza or
Hiro (Japanese) with UNIT on the SYSTEM SETTING 1 menu. For details see page 5-
9.
Ranges may be freely preset as desired. For details see page 5-13.
2-3
2.4 Selecting Sector Width
Sector means the width of the transducer training.
Display sector
96°
Figure 2-4 Display sector
The [SECTOR] control selects the training (display) area among the sixteen positions shown in
the table below. Clockwise rotation of the control increases the sector width; counterclockwise
rotation decreases it.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Sector
width (°
6 24 48 72 96 120 144 168 192 216 240 264 288 312 336 360
)
(shown: 96˚)
In the full-circle mode (360°) the direction of training is clockwise; in the half-circle mode the
direction is clockwise to counterclockwise alternately.
One-touch selection of 360
sector
°°°°
Each pressing of the [FULL/HALF] key alternately selects 360° sector (full circle) or 168° sector
(half circle). If the [SECTOR] control is operated following the selection of the full-circle display,
the next pressing of the [FULL/HALF] key presents the full-circle display.
Sector set with
SECTOR control
FULL/HALF
key
Full circle
FULL/HALF
key
Half circle
168
°
Figure 2-5 How the FULL/HALF key works
2-4
2.5 Selecting Train Center
The [TRAIN] control se lects the center direction of th e detect ion range. The range of adjustmen t
is 0° to 354° in increments of 6°. The selected bearing is shown with a filled circle, the train
indicator, on the bearing scale.
0˚ (360˚) → 6˚ → 12˚ → 18˚ → ... 354˚
Train indicator
Sector
Figure 2-6 Train center
2.6 Selecting the Tilt Angle
The tilt angle shows the direction to which the
sound wave is emitted. When the sound
wave is emitted horizontally, the tilt angle is
said to be 0° and when emitted vertically, 90
To set a tilt angle, operate the [TILT] control.
Watch the tilt angle indication and tilt angle
indicator at the top right corner of the screen.
The tilt angle can be set in increments of 1°
from 0° to +5° (upward) to 0° to 90° (downward).
Select tilt angle depending on target fish. For
surface fish select a narrow angle (about 5°) and
for bottom fish, a wide angle (about 40°).
Sounding beam
°
.
Transducer
+5˚
0˚ Horizontal direction
Tilt angle setting range
90° Vertical direction
2-5
2.6.1 Bottom echo and tilt angle
Refer to the illustration below.
Case 1: Tilt angle 30
This tilt angle will display the entire bottom since it is captured by the full width of the beam.
Case 2: Tilt angle 10
This tilt angle will only display half the bottom since it is only captured by the lower half of the
beam.
Case 3: Tilt angle 0
This tilt angle may or may not capture the bottom since the returning echo is weak.
°°°°
°°°°
to 5
°°°°
to 40
to 20
°°°°
°°°°
°°°°
2.6.2 How to discriminate fish echoes from the bottom
The figure at the bottom of this page illustrates how two fish schools “a” and “b” are displayed on
the screen using three different tilt angles.
Case 1 (Tilt angle 30
Case 2 (Tilt angle 10
to 40
°°°°
to 20
°°°°
:
°)
°)
Fish school is obscured by the bottom.
°)°)
:
°)
°)
Fish school is located above the bottom (midwater).
°)°)
Case 3 (Tilt angle 0
Case 1
Fish school "a"
Bottom
Fish school "b"
to 5
°°°°
:
°)
°)
Fish school is located close to the bottom.
°)°)
Case 2
Case 1
Fish school "a"
Bottom
Fish school "b"
Case 2
Case 3
Bottom
Fish school "b"
Fish school "a"
Case 3
2-6
Figure 2-7 Fish echo and tilt angle
Points to consider
Normally, a vertically distributed fish school is a better sonar target than the bottom,
because it reflects the transmitted pulse back toward the transducer.
In case 3, both fish schools “a” and “b” are presented. Generally speaking, however,
midwater fish schools tend to be larger than bottom fish schools and they are often
displayed near the bottom on the display.
It is difficult to detect bottom fish when they are not distributed vertically.
2.6.3 Tilt angle for surface fish
Sound emitted from the sonar transducer forms an oval-shaped beam with a width of
approximately 12° (for 6 0 kH z tra nsduce r at –3 dB) in th e vert ical d irection (ve rt ica l beam
width). The tilt angle is indicated by the angle between the center line is parallel with the
sea surface and one half of the emitted sound goes upward, toward the sea surface.
This causes one half of the emitted sound to be reflected toward the transducer and
displayed on the screen as sea surface reflections. When the sea is calm, since the
sound is reflected just like reflections become negligible.
However if the sea is not calm enough, they will become dominant and interfere with
observation of wanted echoes. To minimize these sea surface reflections and to search
fish schools effec tive ly, the tilt angle is usua lly set be tw een 5
of the beam becomes alm ost parallel with the sea s urface. When the sea is rough , the t i lt
angle is slightly increased to lessen the affect of sea surface reflections.
° and 6° so th e upp er po rt ion
Sea surface
Tilt angle 0°
12°
Sea surface
Tilt angle 5-7°
12°
Figure 2-8 T i lt angle
2-7
2.6.4 Suitable tilt angle
The figure below illustrates the re lation ship among tilt angle, depth and detection range. Refer to
it to find out the sui t able tilt angl e for a giv e n dep th/detec ti on ran g e.
Tilt angle and beam coverage (frequency 60 kHz, vertical beamwidth 12° at -3 dB)
20(40)
40(80)
60(120)
80(160)
100(200)
Depth (m)
200(400)
Vertical width of sonar beam
12°
100
(200)
100 m100 m
21 m
200
(400)
200 m
42 m
300
(600)
300 m
63 m
400
(800)
Range (m)
0°
5°
10°
15°
Figure 2-9 T i lt angle an d beam c overage
2-8
2.7 Selecting the Training Speed
The training speed selects how fast the transducer scans the sounding sector. Two choices are
available, normal speed (default setting) and high speed, and one may be selected with the
[FAST SCAN] key. Each time the key is pressed “NORM” (normal speed) or “FAST” (high speed)
momentarily appears at the screen top.
°)
NORM (6
: 60 transmissions required to complete full 360° picture (default setting).
FAST (12
°)
: 30 transmissions required to complete the full 360° picture.
The time necessary to train a full circle depends on range and transducer used. The table below
shows the time required to complete one full circle in the horizontal mode using the 150 kHz
transducer.
Ranges 1 2 3 4 56789101112131415
Unit
Time
required
(sec) for
one full
circle
Note 1:
Note 2:
m 10 20 40 60 80 120 160 200 250 300 400 500 600 800 1000
ft 40 80 120 200 300 400 500 600 700 800 1000 1500 2000 2500 3500
Norm777 7 710131620243240 48 64 81
Fast 7 7 7 7 7 9 11 13 15 17 21 25 28 36 45
Above data for soundome having serial no. 1000 and higher.
The range setting must be at least 160 m to activate high speed training, using the 150
kHz transducer. The [FAST SCAN] key is inoperative when the range setting is less
than 160 meters.
2.8 Finding Echo Position with the Cursor
The cursor measures horizontal range, depth and bearing. Operate the Omnipad to place the
cursor where desired. Cursor position data appears at the top left-hand corner on the screen.
Cursor position data
: Horizontal range
: Depth
B: Bearing
NAV
DATA
Cursor
Figure 2-10 Location of cursor position data
2-9
2.9 Event Marker
The event marker functions to mark important locations on the screen, and five event markers
may be inscribed. Each time the [EVENT] key is pressed the “latest event marker” (
inscribed at the cursor location and all previously entered event markers are shown by the
“previous event marker” (+). When the capacity for event markers is reached the eldest event
marker is erased from the screen to make room for the latest.
⊕
) is
Note 1:
With position data the event marker moves with ship’s movement. The event marker
can be inscribed without position data, however it will be stationary.
Note 2:
The event marker cannot be inscribed from the sub window (strata, history and video
plotter displays). It can only be inscribed from the main window.
Note 3:
Event marker position can be output to external equipment and marked on the display of
the external equipment. Each press of the [EVENT] key outputs event marker position.
For details see EVENT MARK INFO on page 5-9.
2.9.1 Inscribing the event marker
1. Operate the Omnipad to place the cursor on the location desired for an event marker.
2. Press the [EVENT] key to inscribe the event marker. Event marker data appears at the
bottom left-hand corner.
"Latest event
marker"
Display area
"Previous event marker"
Figure 2-11 How to use the event marker
Event marker data
→: Horizontal range
B: Bearing
NAV
DATA
To delete all event markers,
place the cursor outside the
display area and press the
[EVENT] key.
2-10
2.9.2 Deleting all event markers
All event markers can be erased from the screen as follows:
1. Operate the Omnipad to place the cursor outside the display area.
2. Press the [EVENT] key to show the following dialog box. Do the next step within four
seconds, otherwise the dialog box will be erased.
DELETE EVENT MARK?
YESNO
3. Press to select YES and press the [MENU] key. All event markers are erased from the
screen.
2.10 Range and Bearing Markers
The horizontal range, depth and bearing to a fish school can be measured by using the range
and bearing markers.
1. Operate the Omnipad to place the cursor on the location desired.
2. Press the [R/B] key to display the range and bearing markers. Horizontal range, depth and
bearing to the cursor location are shown at the bottom right-hand corner of the screen.
3. To erase the range and bearing markers, place the cursor outside the display area and press
the [R/B] key, or place the cursor on the range or bearing marker and press the [R/B] key.
NA V
Bearing marker
Range marker
Range and bearing
markers data
→:Horizontal range
↓: Depth
B: Bearing from ship's bow
DATA
Figure 2-12 Range and bearing markers
2-11
2.11 Adjusting the Picture
2.11.1 Suppressing bottom and surface reflections
In shallow fishing grounds, excessive sea surface and bottom reflections often interfere with
wanted fish echoes and they cannot be eliminated sufficiently with the TVG controls. In such
cases, try to reduce the output power, without turning down the gain. The picture becomes
clearer when output power is reduced rather than when the gain is decreased.
1. Press the [MENU] key to open the menu.
2. Press
3. Press
to select MENU and then press to select the COMN menu.
MENU
WHITE MARKER
SIG LEVEL
COLOR 16
BKGD COLOR 1
TX POWER HIGH
PULSELENGTH LONG
TX RATE 10
INT REJECT
TRACK ON
: SELECT
COMN HORZ VERT ES PRESET SYS
OFF
OFF
OFF
: CHANGE
MENU: END
Figure 2-13 COMMON menu
or to select TX POWER and press . The following dialog box appears.
TX POWER
MAX MIN
4. Press to select MIN. (For long range detection be sure to return the setting to MAX.)
5. Press the [MENU] key to register your selection and close the menu.
2-12
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