Standard Horizon DS41 User Manual
Standard 2 Inch Installation
Dual Station Operation
NMEA Repeater
Reads in Feet Fathoms or Meters
Adjustable Prop or Surface Offset
Shallow and Deep alarms
DS41
Digital Depth Sounder
Owner’s Manual
Dual
Station
Operation
Contents
Specifications .................................................................................................................2
Operation ........................................................................................................................3
Alarms ........................................................................................................................ 3
Alarms On/Off .............................................................................................................3
Shallow Alarm ............................................................................................................ 3
Deep Alarm ................................................................................................................ 4
Instrument Setup............................................................................................................4
Keel/Surface Offset ....................................................................................................4
Transducer Setting ..................................................................................................... 5
Units of Measure ........................................................................................................5
Troubleshooting..............................................................................................................6
What comes with your Digital Depth Sounder .............................................................7
Standard ....................................................................................................................7
Options .......................................................................................................................7
Replacement Parts .................................................................................................... 8
Installation ......................................................................................................................9
Face Plate Installation ................................................................................................9
Instrument Installation ................................................................................................ 9
Transducer Installation .............................................................................................1 1
General...............................................................................................................11
Sailboats ............................................................................................................12
Powerboats.........................................................................................................12
Transom Installation ........................................................................................... 1 3
In-Hull Installation .............................................................................................. 13
Appendix A – Dual Station Operation .........................................................................14
Master/Slave Selection ............................................................................................ 14
Linked or Separate Selection ..................................................................................1 5
Appendix B – NMEA Repeater Mode..........................................................................16
DS41/HS/2G
DS41 Owner’s ManualDS41 Owner’s Manual
Specifications
• Size
Mount 2" (51mm) diameter hole
Depth behind face plate 3.75" (95mm) max.
Display 3-character LCD
• Color
Black with texture on bezel.
• Backlighting
Red colored diffused lighting for display.
• Water Integrity
Front will withstand direct water spray.
• Depth/Alarm Range
2.0!600 feet
0.6!184 meters
0.3!100 fathoms
(to 9.9 in tenths)
• Sensitivity
0.05mV RMS.
• Transmit Power
36 W RMS nominal at 13.6 VDC.
• Transducer
200 kHz 1900 pF/600 W parallel.
• Display Updating
1 second.
• Operating Voltage
9.5 VDC to 16.5 VDC.
• Operating T emperature
0°C to 50°C (32°F to 122°F).
• Current Drain
150mA max, including internal buzzer.
• Data Input/Output
Single wire data output/Input.
Dual station mode outputs NMEA DPT
sentence. Dual station inputs NMEA DPT
sentence. In the linked mode a dual station
pair also transfer function settings eg. Alarm
on/off.
• NMEA Output
DPT.
• NMEA Input
DPT and DBT.
• External Buzzer Output
12VDC Buzzer, 100 mA max.
• RF Interference
<6 dB quieting on any marine radio channel
(with 3 dB gain antenna) within one meter of
the instrument. Complies with CE EMC
standards EN50081-1 and EN50082-1.
Display is backlit for
Night Operation
Alarm On/
Change Value Up
DS41 Owner’s Manual2
888
Horizon Depth
^
OFFON
V
Change Value Down
Alarm Off/
Operation
OFF
ON
^
V
OFFON
V
OFFONON
^^
V
8
OFFOFFONON
^^
VV
Whenever power is applied the depth sounder
is active and water depth is displayed. If the
sonar signal does not show a bottom the display
will indicate “- -”. This can occur if the water is
aerated or the maximum depth is exceeded.
Note: The maximum depth decreases as boat
speed increases.
Alarms
Two types of alarms can be set; the Deep Alarm
and the Shallow Alarm. The Deep Alarm can be
set as high as 184 meters (605 feet) while the
Shallow Alarm can be set as low as 0.3 meter
(1 foot).
Whenever the water depth is greater than the
Deep Alarm setting and the alarm is enabled an
alarm will sound. The alarm repeats two shor t
beeps and alternates DAL and the water depth
on the display.
Whenever the water depth is less than the
Shallow Alarm setting and the alarm is enabled
an alarm will sound. The alarm repeats a single
long beep and alternates SAL and the water
depth on the display.
Alarms On/Off
Alarm settings are saved in memory.
To turn the alarm on, press the " (ON) key. An
arrow on the lower right corner of the display will
show (next to the Alarm Bell), to indicate that the
alarms are on.
Note:
The arrow will flash if alarms are turned
ON but the shallow alarm is individually
set to OFF. See next section.
Shallow Alarm
To set the shallow alarm:
1. Press the " key for three seconds. The
display will show:
Press for 3 Seconds
SAL
2. After a few seconds the display will indicate
the current Shallow Alarm depth setting.
8
51
3. Use the " and # keys to change the
value. If either key is held depressed for
more than one second the reading will
increase or decrease rapidly.
4. When the alarm is set, exit by pressing
both the " and # keys simultaneously.
Alternatively, if no keys are pressed for a
period of 5 seconds the normal depth
display will resume.
ON
^
V
OFF
120
To turn the alarms off, press the # (OFF) key.
The arrow in the lower right corner will
extinguish.
120
#
#
Press simultaneously to exit
If the reading is decreased to below
1.5 feet (or equivalent) the display will
show
!""
and the alarm will be disabled.
The alarm can also be disabled by
pressing both the " and # keys for 5
seconds. The word
but the alarm depth will be retained for
Note:
!""
will be displayed
future use.
DS41 Owner’s Manual3
OFFON
V
8
OFF
ON
^
V
Instrument Setup
OFF
ON
^
V
Deep Alarm
To set the deep alarm:
1. Press the # key for three seconds. The
display will show:
OFF
V
dAL
2. After two seconds the display will indicate
the current Deep Alarm depth setting.
8
50
3. Use the " and # keys to change the
value. If either key is held depressed for
more than one second the reading will
increase or decrease rapidly.
4. When the alarm is set, exit by pressing
both the " and # keys simultaneously.
Alternatively, if no keys are pressed for a
period of 5 seconds the normal depth
display will resume.
ON
^
Press simultaneously to exit
3 Seconds
OFF
V
Press for
Keel/Surface Offset
An offset may be automatically added to or
subtracted from the depth reading to
compensate for the location of the transducer.
This allows the instrument to indicate the water
depth relative to the bottom of the keel or the
surface of the water.
To set the keel/surface offset:
1. Apply power while holding down the " key.
ON
^
Hold down during power up
2. When the unit is on, release the " key. The
display will indicate if the current offset is
keel offset or waterline offset:
Hull Offset (Depth below the keel)
If the reading is increased one step above
600 feet (or equivalent) the display will
show
!""
and the alarm will be disabled.
The alarm can also be disabled by
pressing both the " and
seconds. The word
but the alarm depth will be retained for
DS41 Owner’s Manual4
Note:
!""
will be displayed
future use.
#
keys for 5
Surface Offset (Depth below the surface)
3. After 5 seconds the display will indicate the
current offset.
Note:
A negative offset is used to display depth
below the keel and a positive offset is
used to display depth below the surface.
4. Use the " and # keys to change the
OFF
ON
^
V
OFFON
V
88Ft
8888
88FA
OFFOFFONON
^^
VV
tdr
value. If either key is held depressed for
more than one second the reading will
increase or decrease rapidly.
5. The offset can be programmed in 0.1 unit
steps from -9.9!9.9 feet (or equivalent).
When programmed for a negative offset, ‘-’
will be indicated on the left hand side of the
display.
6. To display depth below the keel enter the
vertical distance between the bottom of the
keel and the depth trasnducer as a
negative value.
7. To display depth below surface enter the
vertical distance from the waterline to the
depth transducer as a positive number (no
negative sign).
8. To exit this mode, press and hold both the
" and # keys simultaneously. Alternatively,
if no keys are pressed for a period of 5
seconds normal depth display will resume.
The display will now indicate the current
water depth.
T ransducer Setting
A Transducer Setting is provided to allow the
D41 to be used with different transducer types.
The default setting (=0.0) is used for most
transducers.
Some transducers ‘ring’ after the sonar transmit
pulse (just like hitting a bell). This ringing can be
interpreted as an echo from a shallow bottom.
The setting is used to increase the required level
that shallow echoes must meet before they will
be displayed.
If the D41 gives repeated false readings of 1.5
to 3 feet depth while in deep water the transducer
setting should be increased. Adjust it upward by
0.5 at a time and retest. The range of values is
-0.9 to +2.5. If the value is set too high it could
cause erratic readings in shallow water.
Changing the Transducer Setting
1. Apply power while holding down the "ON
key. The display will show either HOF or
SOF for 7 seconds. Continue to hold the
key down.
ON
^
Press simultaneously
V
OFF
2. The display will show tdr.
3. Release the key.
4. After 2 seconds the display will show the
Transducer Setting value eg 0.0
5. Use the " and # keys to change the
value.
6. To exit this mode, press and hold both the
" and # keys simultaneously.
Units of Measure
To select the displayed unit
1. Apply power while holding down the # key.
OFF
V
Hold down during power up
2. When the unit is on, release the # key. The
display will indicate the current display unit
with:
Feet Meters
Fathoms
3. Use the " and # keys to change the
value.
4. To exit this mode, press and hold both the
" and # keys simultaneously. Alternatively,
if no keys are pressed for a period of 5
seconds normal depth display will resume.
Press simultaneously
The display will now indicate the current
water depth in the selected display unit.
DS41 Owner’s Manual5
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