Furuno LS-4100 User manual

5" ECHO SOUNDR
LS-4100

TABLE OF CONTENTS
FOREWORD .....................................iii
SYSTEM OVERVIEW........................iv
1. OPERATION...............................1
1.1 Control Description....................1
1.2 Turning the Power On/Off .........1
1.3 Adjusting Display Contrast,
Brilliance....................................2
1.4 Choosing a Display, Frequency.2
1.5 Menu Operating Procedure.......5
1.6 Automatic Operation .................5
1.7 Manual Operation......................6
1.8 Measuring Depth.......................8
1.9 Choosing Picture Advanced
Speed ........................................8
1.10Suppressing Interference ..........9
1.11 Suppressing Low Level Noise...9
1.12Erasing Weak Echoes.............10
1.13A-scope Display ......................10
1.14Alarms ..................................... 11
1.15Waypoints................................12
1.16Setting Up Nav Data Displays.15
1.17Other Menu Items ...................16
2. SYSTEM & INSTALLATION
MENUS......................................18
2.1 System Menu .......................... 18
3. MAINTENANCE,
TROUBLESHOOTING ..............21
3.1 Maintenance ........................... 21
3.2 Cleaning the Display Unit........ 21
3.3 Transducer Maintenance ........ 21
3.4 Replacing the Fuse ................. 21
3.5 Battery Voltage Alert ............... 21
3.6 Troubleshooting ...................... 22
3.7 Diagnostics ............................. 22
3.8 Test Pattern............................. 23
3.9 Memory Clear ......................... 23
4. INSTALLATION.........................24
4.1 Display Unit............................. 24
4.2 Thru-hull Mount Transducer.... 24
4.3 Transom Mount Transducer.... 26
4.4 Inside-hull Transducer............. 28
4.5 Optional Triducer..................... 29
4.6 Optional Water
Temperature/Speed Sensor .... 33
4.7 Wiring...................................... 34
4.8 IEC 61162-1 Data Sentences.. 35
4.9 Installation Menu..................... 36
SPECIFICATIONS........................SP-1
OUTLINE DRAWING
INTERCONNECTION DIAGRAM

i
SAFETY INSTRUCTIONS
Safety Instructions for the Operator
WARNING
Do not open the equipment.
There are no uer-serviceable parts
inside.
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.
Do not maneuver the vessel based
on the depth indication alone.
Grounding may result.
Use the proper fuse.
Fuse rating is shown on the equipment.
Use of a wrong fuse can result in
damage to the equipment.
Do no turn on the equipment with the
transducer out of water.
The transducer may be damaged.
The picture is not refreshed when
picture advancement is stopped.
Maneuvering the vessel in this condition
may result in a dangerous situation.
Use the proper gain setting.
Incorrect gain may produce wrong depth
indication, possibly resulting in a
dangerous situation. See "Adjusting the
gain" on page 7 for details.
CAUTION
WARNING
To avoid electrical shock, do not
remove cover. No user-serviceable
parts inside.
Name:
Warning Label
Type: 02-146-1022
Code No.: 100-306-050
The high quality LCD shows 99.99%
of its pixels. The remaining .01% may
drop out or righten, due to the pro-
perty of the LCD, however this is not
a sign of malfunction.
A warning label is attached to the
equipment. Do not remove the label.
If the label is missing or damaged,
contact a FURUNO agent or dealer.
NOTICE

ii
Safety Instructions for the Installer
WARNING
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 trans-
ducer or sensor mounting location.
Water leakage can sink the vessel. Also
confirm that the transducer and sensor
will not loosen by ship's vibration. The
installer of the equipment is solely
responsible for the proper installation of
the equipment. FURUNO will assume no
responsibility for any damage associated
with improper installation.
Use the specified power cable.
Use of other power cable may result in
fire.
CAUTION
Do not install the equipment where
air bubbles and noise are present.
Performance will be affected.
The following are guidelines for
handling of the transducer cable.
- Do not locate near oils and fuels.
- Locate it in a safe place.
- Do no paint the cable.
The sheath of the cable is made of
chloroprene rubber (or polychloride
vinyl). For this reason do not paint
the cable.
Observe the following compass safe
distances to prevent interference to a
magnetic compass:
Display
unit
Standard Steering
compass compass
0.4 m 0.3 m
Do not turn on the equipment with the
transducer out of water.
The transducer may be damaged.

iii
FOREWORD
A Word to LS-4100
Owners
Congratulations on your choice of the
FURUNO LS-4100 5” Echo Sounder.
We are confident you will see why the
FURUNO name has become
synonymous with quality and reliability.
For over 50 years FURUNO Electric
Company has enjoyed an enviable
reputation for innovative and
dependable marine electronics
equipment. This dedication to
excellence is furthered by our extensive
global network of agents and dealers.
This equipment is designed and
constructed to meet the rigorous
demands of the marine environment.
However, no machine can perform its
intended function unless operated and
maintained properly. Please carefully
read and follow the recommended
procedures 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 LS-4100 is a dual
frequency (50 kHz and 200 kHz)
monochrome LCD echo sounder.
Comprised of a display unit and a
transducer, the LS-4100 displays
underwater conditions on a bright 5-inch
monochrome LCD.
The main features of the LS-4100 are
• Bright 5-inch monochrome LCD gives
excellent readability even in broad
daylight.
• Automatic function permits
unattended adjustment of range and
gain. The range scale and gain
automatically change to display the
bottom in the darkest gray tone on the
lower half of the screen.
• User-programmable nav data displays
provide analog and digital nav data.
• Alarms: Bottom, Fish (bottom-lock
and normal), Speed, Water
Temperature and Arrival. (Speed and
arrival alarms require appropriate
sensor; water temperature alarm
requires water temperature data.)
• White line feature helps discriminate
fish lying near the bottom.
• Destination waypoint feature provides
range, bearing, and time-to-go to
destination waypoint. (up to 12
waypoints)
• Waterproof construction permits
installation on open bridge.

iv
SYSTEM OVERVIEW
System configuration
Power supply
12 VDC
DISPLAY UNIT
LS-4100
GPS Navigator
or
Wind Indicator
Transducer
Water temperature/
Speed sensor
ST-02MSB/ST-02PSB
520-5PSD/520-5MSD/520-5PWD/
525-5PWD/525ST-MSD/525ST-PWD
: Standard
: Option
: User supply
Note: Contact your
dealer for connection of
other equipment.
POWER
BRILL
MARK
GAIN
RANGE
ESC
MENU
MODE
LS-4100
ECHO SOUNDER
Equipment lists
Standard supply
Name Type Code No. Qty Remarks
Display Unit LS-4100 — 1
520-5PSD 000-015-204 Thru-hull mount
520-5MSD 000-015-212 Thru-hull mount
520-5PWD 000-015-126
Transducer
525-5PWD 000-146-966
Transom mount
525ST-MSD 000-015-263 Thru-hull mount
Triducer (transducer
plus spd/temp sensor)
525ST-PWD 000-015-261
1
Transom mount
Installation Materials
(CP02-07401)
• Tapping screw (4 pcs., 5 x 20 SUS304, 000-802-081)
• Washer head screw B (4 pcs., M4 x 20 SUS304, 000-804-742)
• Cable assy. (1 pc., MJ-A7SPF0005-020, 000-139-384, for power and data)
Spare Parts
(SP02-04801) Fuse (2 pc., FGMB 1A 125V, Code No. 000-114-805)
Te m pl a t e C22-00301 (000-146-981, for flush mount),
C22-00302 (000-146-982, for bulkhead)
Optional equipment
Name Type Code No. Qty Remarks
Conversion Cable 02S4147 000-141-082 1 For spd/temp sensor
ST-02MSB 000-137-986
Water Temperature &
Speed Sensor ST-02PSB 000-137-987
Select
one Thru-hull type
Inner Hull Kit S 22S0191 000-802-598 1

1
1. OPERATION
1.1 Control Description
Cursor Pad
Selects menu items
shifts VRM.
Opens/closes menu
escapes from current
operation.
Selects display mode.
Adjusts gain.
Selects basic display range.
Long press: Turns power on/off.
Momentary press: Adjusts display contrast
and brilliance.
Outputs L/L position
to external equipment
registers selected position
as waypoint.
POWER
BRILL
MARK
GAIN
RANGE
ESC
MENU
MODE
LS-4100
ECHO SOUNDER
Display unit
How to remove the hard cover
Place your thumbs at the center of the
cover, and then lift the cover while
pressing it with your thumbs.
1.2 Power On/Off
Press the [POWER/BRILL] key more
than one second to turn on the power.
The unit beeps, the startup screen
appears, and then the equipment
checks the ROM and RAM for proper
operation and displays program number.
(If “NG” (No Good) appears, try to press
any key except the [POWER/BRILL] key
to start operation. However, the
equipment may not work properly.
Contact your dealer.) You may
press any key after the completion of
the equipment check to start operation
sooner.

2
** Program version no.
ROM : OK RAM : OK
Program No: 0252318-01.**
5" ECHO SOUNDER
LS-4100
FURUNO ELECTRIC CO., LTD.
Start-up screen
To turn off the power, press and hold
down the [POWER/BRILL] key until the
screen goes blank. The time remaining
until power is turned off is counted down
on the screen.
Note: The example screens shown in
this manual may not match the screens
you see on your display. The screen
you see depends on your system
configuration and equipment settings.
1.3 Adjusting Display
Contrast, Brilliance
1. Press the [POWER/BRILL] key
momentarily to show the
brilliance/contrast adjustment
window.
CONTST 4
Min Max
BRILL
Min Max
4
Brilliance/contrast adjustment window
2. For contrast, press the
[POWER/BRILL] key to adjust
contrast cyclically. (You may also use
◄or ►on the Cursor Pad to adjust
contrast.) (Adjustable range: 0 to 9)
3. To adjust brilliance, use ▲or ▼.
(Adjustable range: 0 to 4)
4. Press the [MENU/ESC] key to close
the brilliance/contrast adjustment
window.
Note 1: When the power is reapplied
after turning off the equipment with
minimum brilliance, minimum brilliance
will be set after the equipment goes
through its initial start up. (The start up
screen appears with the maximum
brilliance.) Adjust the brilliance as
necessary.
Note 2: Setting windows other than
those on menus are erased if there is
no operation within about seven
seconds.
1.4 Choosing a Display,
Frequency
Seven displays are available: single
frequency (50 or 200 kHz), dual
frequency, marker-zoom, bottom-zoom,
bottom-lock, and nav data (two
displays).
1. Press the [MODE] key to show the
mode selection window.
MODE
SINGLE FREQ.
DUAL FREQ.
MARKER ZOOM
BOTTOM ZOOM
BOTTOM LOCK
NAV DATA-1
NAV DATA-2
50kHz 200kHz
Mode selection window
2. Press the [MODE] key again within
seven seconds to choose a mode.
You may also choose a mode with ▲
or ▼.
3. For modes other than DUAL FREQ,
choose frequency. Press ◄for 50
kHz or ►for 200 kHz.
4. Press the [MENU/ESC] key to close
the window.

3
Single frequency display
50 kHz
The sounder uses ultrasonic signals to
detect bottom conditions. The lower the
frequency of the signal, the wider the
detection area. Therefore, the 50 kHz
frequency is useful for general detection
and judging bottom condition.
200 kHz
The higher the frequency of the
ultrasonic signal the better the
resolution. For this reason the 200 kHz
frequency is ideal for detailed
observation of fish schools.
50 kHz
200 kHz
Frequency and coverage area
46.6
Fish
School
Bottom
0
20
40
50k 1/1
0.0
Level Bar
Depth
Frequency
Picture Advance Speed
Range Scale
Mode
(AUTO or MANUAL)
40.7°F
16.2kt
Nav Display
Minute
Marker
(Shows time.
Each bar
is 30 sec.)
Transmission
Line
60
Typical 50 kHz display
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 transmitting
frequencies.
50 kHz 200 kHz
picture picture
49.6
0.0
50/200 1/1
0
20
40
60
80
20
40
60
80
Dual frequency display
Marker-zoom display
This mode expands chosen area of the
normal picture to full vertical size of the
screen on the left-half window. You may
specify the portion to expand by
operating the VRM (Variable Range
Marker), which you can shift with ▲or
▼. The area between the VRM and
zoom range marker is expanded.
Zoomed
fish
school
Single frequency display
Variable range
marker
This section
is zoomed
Zoom marker
Marker-zoom display
17.0
25.0
0
Fish
school
0
40
10
20
30
0.0
50k 1/1
21
20
19
18
17
22
Marker-zoom display

4
Bottom-zoom display
This mode expands bottom and bottom
fish in the range width set with ZOOM
RANGE of the SYSTEM menu. This
mode is useful for determining bottom
contour. When the bottom depth
increases, the display shift to keep the
bottom echo at the lower part of the
screen.
0
Bottom-zoom display
29.8
Bottom
0
40
10
20
30
32
31
30
29
28
27
Switched with
depth
Single
frequency
display
Zoom
marker
0.0
50k 1/1
Bottom-zoom display
Bottom-lock display
The bottom-lock display provides a
normal picture on the right half of the
screen and a 15 feet (5 meter)* wide
layer in contact with the bottom is
expanded onto the left half of the screen.
This mode is useful for detecting bottom
fish.
* = Operator selectable
Bottom-lock display
Zoom
marker
Zoomed
fish
This section
is zoomed
21.7
0
Single
frequency
display
Fish
school
0
40
Bottom displayed flat
10
20
30
0
1
2
3
4
5
50k 1/1
Bottom-lock display
Nav data displays
The nav data displays appear on the left
of the screen. Data other than depth
requires appropriate sensor.
You can display between two and four
items in a nav data display and choose
the item and order to display them. See
paragraph 1.16 to choose the items to
display, “NAV DATA-1” and “NAV
DATA-2” in paragraph 2.1 to choose the
number of items to display.
Depth
69.4m
Trip meter
10.0nm
Odometer
56nm
NAV DATA- display
NAV DATA-2 display
Temperature
65.5°F
17.2
0.5 0 0.5
0.25nm
XTE
Speed
kt
20
50
40
60
30
10
0
Sample NAV DATA displays
(Default setting)

5
1.5 Menu Operating
Procedure
The LS-4100 has three menus: Main,
System and Installation. Below is the
basic menu operating procedure.
1. Press the [MENU/ESC] key to open
the main menu. Page 1 or Page 2 of
the main menu appears depending
on the page last used.
[MENU]: Exit
(1/2)
Note: SHIFT and CLUTTER are
not available in the auto mode.
AUTO MODE Off
SHIFT : 0ft
PIC. ADVANCE : 1/1
NOISE LIMIT : Off
CLUTTER : Off
SIGNAL LEVEL : Off
A-SCOPE : Off
HUE : Day
WHITE LINE : Off
DEEP GAIN : Low
Page
no.
Main menu, page 1
2. Use ▲or ▼to select an item. To
view page 2 of the main menu, press
▼until showing the display below.
[MENU]: Exit
(2/2)
GOTO WPT Off
WAYPOINT LIST...
TRIP RESET?
GAIN ADJ 200 : +0
GAIN ADJ 50 : +0
DRAFT : 0.0ft
ALARM MENU...
SYSTEM MENU...
Main menu, page 2
3. Press ►to show selected item’s
options window. The example shown
at the top of the right column is the
options window for AUTO MODE.
Off
Cruising
Fishing
Auto mode options window
4. Use ▲or ▼to choose option or set
numeric value.
5. Press the [MENU/ESC] key to close
the menu, or press ◄to continue
menu operation.
1.6 Automatic Operation
How automatic operation works
The automatic function automatically
chooses the proper gain, range scale
and clutter. It works as follows:
• The range changes automatically to
display the bottom echo on the
screen.
• The gain is automatically adjusted to
display the bottom echo in the darkest
tone.
• Clutter (on the menu), which
suppresses low-level noise, is
automatically adjusted.
Choosing automatic operation
The automatic mode provides two
choices of modes: cruising and fishing.
1. Press the [MENU/ESC] key to open
the main menu.
2. Press ▲to choose AUTO MODE
from page 1 of the menu.
3. Press ►to open the mode options
window.
4. Choose Cruising or Fishing as
appropriate.
“Cruising” is for tracking the bottom;
“Fishing” is for searching fish schools.
Since “Cruising” uses a higher clutter
rejection setting than fishing, it is not
recommended for fish detection -
weak fish echoes may not be
displayed. “Fishing” clearly displays
weaker echoes.

6
5. Press the [MENU/ESC] key to close
the menu.
The auto mode in use is shown as
(Auto-Fishing) or
(Auto-Cruising) at the top left corner on
the screen.
Note: When in the auto mode, SHIFT
and CLUTTER cannot be adjusted
manually.
Range offset
To display the bottom tail in detail in the
automatic mode, offset the range as
below.
1. Press the [+] or [-] key of the
[RANGE] key.
+0 ft
AUTO RANGE OFFSET
Auto range offset window
2. Press the [+] or [-] key of the
[RANGE] key again to choose offset
desired (range: -100 to +300 ft).
Note that if the basic range is
changed the offset is returned to “0”.
3. Press the [MENU/ESC] key to finish.
Gain offset
Gain offset lets you override automatic
gain adjustment.
1. Press the [GAIN] key.
Min Max
± 0
AUTO GAIN OFFSET
Auto gain offset window
2. Press ◄or ►key to offset gain
(setting range –5 to +5). The gain
selected is shown at the top of the
screen as
G (Gain) + (or -) XX (offset value).
3. Press the [MENU/ESC] key to finish.
1.7 Manual Operation
Choosing the manual mode
1. Press the [MENU/ESC] key to open
the main menu.
2. Press ▲to choose AUTO MODE
from page 1 of the menu.
3. Press ►to show the window.
4. Choose Off with ▲.
5. Press the [MENU/ESC] key to close
the menu.
MANUAL
appears at the top
left corner on the screen.
Choosing range
The basic range and range shifting
functions used together give you the
means to choose 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.
Choosing basic range
The basic range may be chosen with
the [RANGE] key from the eight ranges
shown in the table shown below. (“P/B”
in the table means Passi/Braza.) The
setting range can be arranged through
the SYSTEM menu.
Default ranges
Basic Range
Unit
1 2 3 4 5 6 7 8
meters 5 10 20 40 80 150 200 300
feet 15 30 60 120 200 400 600 1000
fathoms 3 5 10 20 40 80 100 150
hiro* 4 8 15 30 50 100 150 200
P/B 3 5 10 30 50 100 150 200
*Japanese unit of depth measurement
1. Press the [+] or [-] key of the
[RANGE] key and the display should
now look something like the one on
at the top of the next page.
2. Press the [+] or [-] key of the
[RANGE] key again to choose a
basic range.

7
1000ft
600ft
400ft
200ft
120ft
60ft
30ft
15ft
Basic ranges (default)
3. Press the [MENU/ESC] key to close
the window.
Shifting the range
The basic range may be shifted up or
down in the manual mode as follows:
Display
Window can be
shifted up and
down to select
the depth.
Range and display shift concept
1. Press the [MENU/ESC] key to open
the main menu.
2. Choose SHIFT from page 1 of the
menu.
3. Press ►to open the shift options
window.
0ft
Shift window
4. Use ▲or ▼to choose amount of
shift desired.
5. Press the [MENU/ESC] key to close
the window.
Note: The picture may not be displayed
if the amount of shift is greater than
actual depth.
Adjusting the gain
The [GAIN] key adjusts the sensitivity of
the receiver. Generally, use a higher
gain setting for greater depths and a
lower setting for shallower waters.
Use the proper gain setting.
Incorrect gain may produce wrong depth
indication, possibly resulting in a dangerous
situation.
CAUTION
Gain too high Gain proper Gain too low
Examples of proper and improper gain
1. Press the [GAIN] key and the display
shown below appears.
Min Max
50k 3
200k 2
GAIN
Gain adjustment window
2. When using the dual frequency
display, press ▲or ▼to choose
frequency.
3. Press the [GAIN] key to set. (You
may also use ◄or ►.) Adjust so that
a slight amount of noise remains on
the screen.
4. Press the [MENU/ESC] key to close
the gain adjustment window.

8
1.8 Measuring Depth
The VRM (Variable Range Marker)
functions to measure the depth to fish
schools, etc.
1. Press▲or ▼to place the VRM
on the object which you wish to
measure range.
2. Read the VRM depth just above
the VRM.
0
20
40
60
80
49.6
39.8
VRM
VRM depth
50k 1/1
How to measure depth with the VRM
1.9 Choosing Picture
Advance Speed
The picture advance speed determines
how quickly the vertical scan lines run
across the screen. When choosing a
picture advance speed, keep in mind
that a fast advance speed will expand
the size of the fish school horizontally
on the screen and a slow advance
speed will contract it. Note that the
picture is not refreshed when picture
advancement is stopped. Therefore,
use caution when steering the vessel
under this condition.
Fast Slow
Picture and picture advancement speed
1. Press the [MENU/ESC] key to open
the main menu.
2. Choose PIC. ADVANCE from page 1
of the menu.
3. Press ►to show the options
window.
Stop
1/16
1/8
1/4
1/2
1/1
2/1
4/1
()
Fast
Slow
Picture advance options window
4. Use ▲or ▼to choose picture
advance speed desired. The
fractions in the options window
denote the number of scan lines
produced per transmission. For
example, 1/8 means one scan line is
produced every 8 transmissions.
“Stop” freezes the display and it is
convenient for taking a photo.
The picture is not refreshed when
picture advancement is stopped.
Maneuvering the vessel in this condition
may result in a dangerous situation.
CAUTION
5. Press the [MENU/ESC] key to close
the menu.

9
1.10 Suppressing
Interference
Interference from other acoustic
equipment operating nearby or other
electronic equipment on your boat may
show itself on the display as shown in
the figure below.
To suppress interference, do the
following:
1. Press the [MENU/ESC] key to open
the main menu.
2. Use ▲or ▼to choose NOISE LIMIT
from page 1 of the menu.
3. Press ►to show the options
window.
4. Use ▲or ▼to choose the degree of
suppression desired; Off, Low,
Medium, or High (highest).
5. Press the [MENU/ESC] key to close
the menu.
Interference from
other sounder Electrical interference
Forms of interference
Turn the noise limiter off when no
interference exists, otherwise weak
echoes may be missed.
1.11 Suppressing Low
Level Noise
Low intensity “speckles” may appear
over most of screen. This is mainly due
to sediment in the water or noise. These
can be suppressed by adjusting
CLUTTER on the menu. When the
automatic mode is on, clutter is
automatically rejected. To suppress low
level noise in manual sounder operation,
do the following:
1. Press the [MENU/ESC] key to open
the main menu.
2. Use ▲or ▼to choose CLUTTER
from page 1 of the menu.
3. Press ►to show the options
window.
4. Use ▲or ▼to choose the degree of
suppression desired; 1, 2, 3 ,4, 5 or
6. The higher the number the greater
the suppression.
5. Press the [MENU/ESC] key to close
the menu.
To turn off low-level noise
suppression, choose Off at step 4 and
then press the [MENU/ESC] key.
Clutter appearance

10
1.12 Erasing Weak
Echoes
Sediment in the water or reflections
from plankton may be painted on the
display in low intensity tones.
Weak
echoes
Appearance of weak echoes
These weak echoes may be erased as
follows:
1. Press the [MENU/ESC] key to open
the main menu.
2. Use ▲or ▼to choose SIGNAL
LEVEL from page 1 of the menu.
3. Press ►to show the options
window.
4. Use ▲or ▼to choose the degree of
suppression desired; Off, Low, or
High (highest).
5. Press the [MENU/ESC] key to close
the menu.
To turn off the signal level function,
choose "Off" at step 4 and then press
the [MENU/ESC] key.
1.13 A-scope Display
This display shows echoes at each
transmission with amplitudes and tone
proportional to their intensities, on the
right 1/4 of the screen. It is useful for
estimating the kind of fish school and
bottom composition.
Note: In the dual frequency display, the
A-scope display is only available with
the high frequency display.
32.3
10
20
30
40
0
A-scope display
Single frequency display
Strong
reflection
(bottom)
Weak
reflection
(fish or noise)
50k 1/1
Strong
reflection
(fish)
A-scope display
1. Press the [MENU/ESC] key to open
the main menu.
2. Press ▲or ▼to choose A-SCOPE
from page 1 of the menu.
3. Press ►to show the options
window.
4. Press ▲or ▼to choose the
A-scope presentation type desired.
Normal: Display shows echoes at
each transmission with amplitudes
and tone proportional to their
intensities.
Peak: Peak-hold amplitude picture.
5. Press the [MENU/ESC] key to close
the menu.
To turn off the A-scope display,
choose Off at step 4 and then press the
[MENU/ESC] key.

11
1.14 Alarms
Alarm description
The LS-4100 has six conditions which
generate both audio and visual alarms:
bottom alarm, normal fish alarm, bottom
lock fish alarm, water temperature alarm,
arrival alarm and speed alarm. (The
water temperature, arrival and speed
alarms require appropriate sensors.)
Bottom alarm: The bottom alarm alerts
you when the bottom is within the alarm
range set. To activate the bottom alarm
the depth must be displayed.
Fish (normal) alarm: The fish (normal)
alarm tells you when fish are within the
preset alarm range.
Fish (bottom lock) alarm: The fish
(bottom lock) alarm, available with the
bottom-lock mode, sounds when fish
are within a certain distance from the
bottom. Note that the bottom zoom
display must be turned on to use this
alarm.
Water temperature alarm: The water
temperature alarm alerts when the
water temperature is within (Inside
alarm) the alarm range set or
under/over (outside alarm) the range
set.
Speed alarm: The speed alarm alerts
you when the speed is within (Inside
alarm) or under/over (Outside alarm)
the preset speed.
Arrival alarm: The arrival alarm alerts
when you are near a waypoint by the
distance set.
Activating an alarm
1. Press the [MENU/ESC] key.
2. Press ▲or ▼to choose ALARM
MENU from page 2 on the menu.
3. Press the ►to show the ALARM
menu.
ALARM
(1/2)
[MENU]: Exit
ALARM
(2/2)
[MENU]: Exit
BOTTOM On
FROM : 5ft
RANGE : 10ft
FISH(Normal) : On
FROM : 5ft
RANGE : 10ft
FISH(B/L) : On
FROM : 8ft
RANGE : 1.0ft
FISH LEVEL : Medium
TEMPERATURE Inside
FROM : 72.4°F
RANGE : 1.0°F
SPEED : Off
FROM : 0.0kt
RANGE : 1.0kt
ARRIVAL ALRM : Off
RANGE : 0.01nm
Page
no.
Gray characters mean alarm is inactive.
Alarm menu
4. Use ▲or ▼to choose an alarm as
appropriate.
5. Press ►to show the options menu.
Off
On
Off
Inside
Outside
Temp, Speed
Alarm Types
Fish, Arrival,
Bottom Alarm
On/Off
Alarm options
6. Use ▲or ▼to choose alarm type:
Off: Alarm off, On: Alarm on
Inside: Alarm generated when
speed (or water temperature) is
within the range set.
Outside: Alarm generated when
speed (or water temperature) is
outside the range set.
7. Press ◄to close the window.
For ARRIVAL ALARM setting, skip to
step 12.

12
8. Press ▼to choose FROM.
9. Press ►to show the options menu.
0ft
Depth
63.2°F
Temperature
1.0 kt
Speed
Depth, temperature, speed setting
window
10.Use ▲or ▼to set starting depth,
temperature or speed as appropriate.
For FISH (B/L), the starting depth is
the range from the bottom.
11.Press ◄to close the window.
12.Press ▼to choose RANGE.
13.Press ►to show the options menu.
14.Use ▲or ▼to set alarm range.
15.For the bottom alarm, temperature
alarm, speed alarm or arrival
alarm, press the [MENU/ESC] key to
finish. For a fish alarm, press ◄to
close the window, and then go to
step 16.
16.Press ▼to choose FISH LEVEL.
17.Press ►to show the options menu.
Weak
Medium
Strong
Fish level options
18.Use ▲or ▼to choose the echo
strength level which will trigger a fish
alarm:
Weak: Weak echoes (weakest tone
on level bar)
Medium: Medium strength echoes
(middle tone on level bar)
Strong: Strong echoes (darkest tone
on level bar)
19. Press the [MENU/ESC] key twice to
close the menu.
Alarm range marker
l
Bottom alarm, Fish alarm (normal): Right
l
Fish alarm (bottom/lock): Left
Alarm icon*
Alarm range Starting
point
: Bottom alarm
: Fish alarm (normal)
: Fish alarm (B/L)
: Temperature alarm (°C or °F shown)
: Speed alarm
: Arrival alarm
* Alarm icon (Appropriate icon appears to show
which alarm has been violated.)
How the alarm works
Note: To disable an alarm, choose Off
at step 5 in the above procedure.
Silencing the buzzer
The buzzer sounds and the appropriate
alarm icon appears and flashes when
an alarm is violated. You can silence the
buzzer by pressing any key. However,
the buzzer will sound whenever the
alarm setting is violated.
Note: The audio and visual alarms are
released against the last-violated alarm
when multiple alarms are active.
1.15 Waypoints
Waypoints may be used to:
• Record the position of an important
echo as waypoint. 12 points may be
registered.
• Output a waypoint position to a plotter
to mark position on its screen
• Find range, bearing and time-to-go to
a location (waypoint)
Note: Requires latitude and longitude
position from a navigator.

13
Registering a waypoint on the
screen
1. Press the [MARK] key. The cursor
appears along with waypoint entry
instructions. To enter a waypoint to
the current own ship’s position, go to
step 3.
Note: If there is no position data the
message “No position data!” appears.
Check the navigator.
50k
49.6
1/1
0.0
20
40
60
80
0
Cursor
WAYPOINT ENTRY
( Move) Cursor
[MARK] Enter
[MENU] Cancel
50 kHz display
2. Press the cursor pad to set the
cursor where desired. Picture
advancement is stopped until step 3
is completed, and the instruction
window is integrated into the nav
display.
3. Press the [MARK] key again. When
TLL or FURUNO-TLL is selected at
TLL OUTPUT on the System menu,
the latitude and longitude position at
the cursor is output to the navigator.
A vertical line marks location. Further,
the display shows the waypoint
name (next sequential number) and
position of the location selected at
step 2.
WAYPOINT
Name FREQ.
Lat : 34°22.796'N
Lon : 136°07.264'E
05
[MENU]: Exit
Erase?
Waypoint data display
Note: If you attempt to enter 13th
waypoint, the message “Memory
full!” appears. In this case, erase an
unwanted waypoint to enable entry.
4. To save the waypoint under the
name shown go to step 8, or go to
step 5 to change its name.
5. Press ►to open the waypoint name
entry window.
WAYPOINT
Name FREQ.
Lat : 34°22.796'N
Lon : 136°07.264'E
05
[MENU]: Exit
01------
ENT
Erase?
Waypoint window, name entry
6. Use ▲or ▼to set character; ◄or
►to shift cursor. The name may
consist of 10 alphanumeric
characters.
Note: Character order is 0→1…9→-
→A→B…Z→_ →0…
7. Press ►to choose ENT .
8. Press the [MENU/ESC] key to
register the waypoint.
Registering waypoint by L/L
1. Press the [MENU/ESC] key to open
the main menu.
2. Use ▲or ▼to choose WAYPOINT
LIST from page 2 of the menu.
3. Press ►.

14
WAYPOINT LIST
0101
0203
03
------
------
------
------
------
------
------
------
------
[MENU]: Exit
Waypoint list
4. Press ▲or ▼to choose an empty
waypoint and press ►. Press ►
again.
NEW WAYPOINT
Name FREQ.
Lat : 34°22.796'N
Lon : 136°07.264'E
05
[MENU]: Exit
04------
ENT
Erase?
New waypoint window, name entry
5. Use ▲or ▼to set character; ◄or
►to shift cursor.
6. Press ►to select ENT .
7. Enter latitude and longitude, similar
to how you entered waypoint name.
8. Press the [MENU/ESC] key to
register the waypoint.
Editing waypoints
1. Press the [MENU/ESC] key to open
the main menu.
2. Use ▲or ▼to choose WAYPOINT
LIST from page 2 of the menu.
3. Press ►to open the waypoints list.
4. Use ▲or ▼to choose a waypoint
and press ►.
5. Use ▲or ▼to choose the item to
edit. (name, latitude or longitude)
6. Press ►to open the data entry
window.
7. Use ▲or ▼to set character; ◄or
►to choose location.
8. Press ►to choose ENT .
9. Press the [MENU/ESC] key.
Erasing waypoints
1. Press the [MENU/ESC] key.
2. Use ▲or ▼to choose WAYPOINT
LIST from page 2 of the menu.
3. Press ►to open the waypoints list.
4. Use ▲or ▼to choose the waypoint
to erase, and then press ►.
Note: You cannot erase a waypoint
which is selected as “GOTO WPT.”
5. Press ▼to choose “Erase.”
6. Press ►to open the options window.
7. Press ▲to select YES to erase the
waypoint. The waypoint list appears,
with the erased waypoint blank.
8. Press the [MENU/ESC] key twice to
close the menu.
Setting destination waypoint
Set a destination waypoint to find range,
bearing and time-to-go to that point. You
can see range and bearing to a
waypoint. Time-to-go is shown on the
Time to Go digital display.
1. Press the [MENU/ESC] key to open
the main menu.
2. Use ▲or ▼to choose GOTO WPT
from page 2 of the menu.
3. Press ►to open the waypoints list.
Off
01
02
03
04
--------
--------
--------
--------
--------
--------
--------
--------
Waypoint list
4. Use ▲or ▼to choose a waypoint.
5. Press the [MENU/ESC] key to close
the menu.