The JLR-31/JLR-21 GPS compass continues the success of its predecessor, reaching a new level of performance and stability with many new features and enhancements. This system is also known as a 3D Dynamic Sensor™, which besides giving heading information, is designed to provide highly accurate information of the ships movement in all axis.
The JLR-31/JLR-21 has heave functionality built-in as standard. In rough ocean conditions (with high waves), the GPS compass can correct up and down (attitude), movement. This is especially useful for fish finders and sonars on fishing vessels where high waves are compensated for with 20cm rms accuracy, providing better potential for a profitable catch.
The JLR-31/JLR-21 supports Speed Over Ground (SOG) and Course Over Ground (COG). The position, SOG and COG are updated every 200 milliseconds (which is 5 times faster than previous model JLR-30/JLR-20), delivering high accuracy.
Traditionally, the means used to measure the heading of a ship has been a mechanical gyrocompass and/or a traditional magnetic compass. With the adoption of the new installation requirements in SOLAS-V, all passenger ships and all ships from 300 to 500 GT travelling international routes can now install a new technology directional sensor, the Transmitting Heading Device (THD). JRC's new JLR-31/JLR-21, IMO type-approved as both Transmitting Heading Device (THD) and as Satellite Navigator (GPS), suits for the vessels as SOLAS-V required primary heading sensor or primary GPS.
IMO performance standard
Gross Tonnage
Transmitting Heading Device (THD)
From 300GT to less than 500GT
Satellite Navigator (GPS)
20GT or more
The JLR-31/JLR-21 incorporates many display modes readily available on a highly visible 5.7 inch LCD display. The display is fully dimmable and the keys are also backlit, making it easy to operate in low-light settings on the bridge.
The compact design of the JLR-31/JLR-21 incorporates an intuitive interface, providing enhanced ergonomics and user friendliness. The logic of the controls and excellent on-screen menus will greatly shorten most users' learning period.
The GPS compass allows calculation of distance and bearing between any two points, supporting Rhumb Lines (RL) for the short legs and Great Circle (GC) for long distance legs. Also, a trip log function comes standard for distance and heading.
The JLR-31/JLR-21 has CCRP¹ function incorporated, allowing the transfer of CCRP sentences to other onboard equipment and anchor watch alerts the watch officer of possible anchor dragging situations.
1. Consistent Common Reference Point
The new trend graph display mode shows a history of roll, pitch and heave and SOG as an easy-to-read graphical view. Selections can be made to show maximum or average results.
The processor is built into the antenna. Eliminating alignment between antenna and processor found in separate systems, therefore contributing to an easy setup with less error and significantly reduced installation time. This concept also reduces the installation costs as only a single cable is used between antenna and display unit.
The outer shell of JRC's new antenna system has a smooth surface. This slippery exterior makes it almost impossible for birds to perch on the domes or for the antennas to be completely covered in snow.
Should something interfere with the coverage, JRC's proven antenna design incorporates a layer of air that reduces possible blind spots, allowing for a more precise heading than conventional systems.
The GPS compass has its origins as a direction sensing system, but the JLR-31/JLR-21 goes far beyond that. The JLR-31/JLR-21 provides an impressive heading accuracy of 0.25° rms (JLR-31)/0.50° rms (JLR-21). Heave accuracy is 20cm rms and roll and pitch for both models is 0.5° rms. The tracking Rate of Turn (ROT) is 45° per second.
On the right a comparison between previous GPS compass model (JLR-30/JLR-20) and the new model (JLR-31/JLR-21).
The new GPS compass integrates 5 independent working NMEA output ports, which allows for connection to a wide range of onboard navigation equipment, such as radar, plotter, autopilot, sonar or other navigation devices.
The JLR-31/JLR-21 display is compactly designed and can be mounted virtually anywhere. The three-antenna system is exclusively designed by JRC, making it far more reliable than conventional antenna systems. The system has a short start-up time (less than 2 minutes). Maintenance is not required, making it less expensive to maintain than a standard gyro system.
JRC has the ability to cost-eff ectively monitor performance and functionality of the JLR-31/JLR-21 while at sea, significantly reducing downtime and maintenance costs. More about RMS, Click HERE.
Name
GPS Compass/GPS Navigator
Model
JLR-21
JLR-31
IMO approved (THD)
IMO approved (GPS)
Sensor
Model
NNN-21
NNN-31
Receiver Type
Multi channel all-in-view (12ch + 1ch SBAS)
Frequency
1575.42MHz ± 1MHz(C/A code)
Direction accuracy
0.5° rms
0.25° rms
Rolling accuracy
0.5° rms
Pitching accuracy
0.5° rms
Heaving accuracy
20cm rms
Display resolution
0.1°
Resolution output
0.1° or 0.01° (selectable)
Tracking Rate of Turn
45° / sec
Tracking acceleration
1G
Start-up time
less than 2 minutes (warm start fix, typically 30 seconds)
DGPS input
RTCM SC-104 Ver.2.0 Type 1, 2, 9, 16
SBAS receiver
Built-in(MSAS/WAAS/EGNOS)
RAIM function
Built-in
Position accuracy
GPS : 12m 2drms (C/A code, HDOP≦4, SA OFF) SBAS : 6m 2drms when SBAS corrected DGPS : 4m 2drms when DGPS corrected (when connected to beacon receiver)
GPS : 12m 2drms (C/A code, HDOP≦4, SA OFF) SBAS : 5m 2drms when SBAS corrected DGPS : 3m 2drms when DGPS corrected (when connected to beacon receiver)
Protection
IPX6
Ambient conditions
-25 to +55°C (operational) -25 to +70°C (storage)
Display
Model
NWZ-4701
Display
5.7-inch LCD, 320 by 240 pixels
Display modes
Compass rose, bow heading, navigation, rate of turn (ROT), water/ground speed, trend graph, calculation, GPS status
Selectable sentences depend on versions (NMEA 1.5, 2.1, 2.3) Some combinations of output sentence, bit rate, and output intervals may not be possible ATT and HVE sentence can be set from output cycles of 25ms, 50ms,100ms, 200ms, 1s, 2s only
2
Accepted for JMA-3300/5100/5200/5200MK2/5300/5300MK2 series
•
Display
•
Antenna
•
Cables
Cables
•
Installation parts
•Power cable display
2 m
•
Spare parts ·
•Serial data cable
3 m
•
Manual
•Display to antenna*
10 m
*The cable length may vary depending on sales region.
Options
•
Serial data cable
CFQ-5374 (3 m)
•
Sensor extension cable
CFQ-7249 (20 m)
•
Flush mount kit ·
MPBC43664
•
AC power rectifier ·
NBG-320
•
DGPS receiver
JLR-4341
All specifications are subject to change without notification.
