Measures ship speeds within a range of 0.03kn or 0.3%*with greatly improved
ship speed
tracking to assist with precise navigation during berthing.
Equipped with proprietary bubble detection, which informs when speed
accuracy is
reduced due to bubble contact.
Color LCD display model with touch panel for improved night visibility is
also available.
Also available in a three-unit model, which provides smaller ships with the
same
exceptional speed tracking capability.
Features
The JLN-740 series is a Doppler Speed Log compliant with the IMO MSC.96(72)
standard, required on all internationally-voyaging ships exceeding 300 GT.
Boasting never-before-seen accuracy for speed measurement, the JLN-740 is also
installed with our company's proprietary bubble detection, which informs you
when measurement accuracy is impaired due to air bubble contact. A model
featuring color LCD touch panels for the main and sub displays, allowing you to
view important information and adjust brightness in all displays from one
location, is also available.
Speed measurement image
Precise Ship Speed Tracking
The JLN-740 series utilizes digital signal processing, which, coupled with
optimizations to existing speed measurement waveforms and the reliability
of ship bottom mounting, has resulted in water speed measurement with
accuracy up to 0.03kn or 0.3% in all models*1.
That accuracy of information allows for highly fuel-efficient speeds,
which means faster voyages with less waste. Along with improved speed
measurements, the series also has greatly improved ship speed tracking,
relaying all the information you need for precise navigation during
berthing.
*1 At fixed speeds (measured value).
Bubble Detection
A long-unsolvable problem with doppler-based water speed measuring systems
was reduced accuracy from bubbles making contact with the measuring device
on the bottom of the vessel. The JLN-740 series detects when bubbles
contact the transducer, and - using proprietary technology from JRC -
alerts you of reduced measuring accuracy via the display. Confirming the
source of the issue typically requires visually examining the device on
the bottom of the ship. However, onboard air bubble detection allows you
to skip unnecessary preventive maintenance.
Performance Standard Compliant
The JLN-740 series is compliant with the IMO MSC.96(72), A.824 (19), and
A.694(17) standards, required on all internationally-voyaging vessels exceeding
300 GT, and meets standards for the following IEC environmental test standards
MARITIME NAVIGATION AND RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS
IEC 60945(2002)
Marine speed and distance measuring equipment(SDME)
IEC 61023(2007)
Presentation of navigation-related information on shipborne navigational
displays
IEC 62288(2014)
Digital interfaces - Single talker and multiple listeners
IEC61162-1(2010)
Digital interfaces - Ethernet interconnection
IEC61162-450(2011)*2
In addition, when used with JRC's Satellite Log JLN-720, ships exceeding 50,000
GT can meet the requirements for IMO MSC.334(90).
*2 Only supports JLN-740A/N
System
4 Models to Choose From
Displays: Two types, color LCD display with a design identical to the Satellite
Log JLN-720, and the Black and white display based on the NWZ-4610.*1
*2 The color LCD display provides the high-visibility and the operability
of the JLN-720.
Unit compositions: 2 types, four- unit and three-unit versions.
*1 The four-unit composition is appropriate for large ships needing share of
data such as radar and ECDIS to navigation equipment.
*2 The three-unit composition is appropriate for small ships. A total of 4
combinations can be selected from depending on the required use.
System diagram
JLN-740A/N
JLN-741A/N
Standard components
Main Display (Color LCD/4.5-inch monochrome LCD)
Distribution processor (only JLN-740A/N model)
Signal processor
Transducer Mounting
Option
Remote Display (6.5-inch / 8.4-inch color LCD)
Multi-information Display (MID) (monochrome LCD)
Analog Display
Distance Counter
Dimmer Unit
Gate valve type Transducer Mounting
Remote Maintenance System (RMS)-compatible
The JLN-740 series is compatible with JRC's proprietary Remote Maintenance
System (RMS), which uses JRC's VDR and satellite communications to remotely link
to the equipment onboard the vessel to perform remote diagnostics and preventive
maintenance. For more information on RMS, please contact JRC's business
department.
Dimensions
Main Display (Color LCD)
NWZ-510SDW
Mass : Approx. 1.2kg
Main Display (Multi Information Display)
NWZ-4640
Mass : Approx.0.8kg
Distribution processor (only 740A/N)
NQA-7040
Mass : Approx. 6.0kg
Signal processor
NJC-70S
Mass : Approx. 5.5kg
Transducer
NKF-547
Mass : Approx. 17kg
Specs
Name
DOPPLER LOG
Model
JLN-740A
JLN-740N
JLN-741A
JLN-741N
IMO approved
✓
Operating system
Dual-beam pulse Doppler system
Operation frequency
2MHz
Measurement scale
-10.00 to 40.00kn
Sailing display range
Model A : 0 to 999999.99NM, Model N : 0 to 99999.99NM (NWW-7 : to
9999.99NM with Distance Counter)
Water speed
3.0 m deeper than the transducer surface
Ship speed accuracy
1 % of the speed of the ship, or 0,1 kn whichever is greater
Total distance accuracy
1 % of the distance run by the ship in 1 h or 0,1 nautical miles in each
hour whichever is the greater.
**The price is subject to change at anytime without any notice. We
are not responsible for any typographical errors. Any products can be
cancelled from sale at any time.
** All Products sold here are Brand New unless specified
Otherwise and come with Full Manufacturer's Warranty
WARNING:
This product can expose you to chemicals including Di-n-hexyl Phthalate (DnHP)
which is known to the State of California to cause reproductive harm, and
Vinyl Chloride which is known to the State of California to cause cancer. For
more information go to P65Warnings.ca.gov.
__________________________________________________________________________________________
WARNING:
This product can expose you to chemicals including Di-n-hexyl Phthalate (DnHP)
which is known to the State of California to cause reproductive harm, and
Vinyl Chloride which is known to the State of California to cause cancer. For
more information go to 
