Features

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.

Heave compensation

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.

High speed update

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.

JLR-31/JLR-21 and IMO recommendations

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.

Display modes

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.

Simple operation

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.

Measuring tool

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.

CCRP and Anchor watch

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

Trend graph

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.

Antenna design

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.

High speed tracking

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).

Interfaces

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.

Installation and maintenance

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.

Remote Maintenance System (RMS)

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.

Specs

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
	Direction & nav. data output1	IEC61162/NSK(shared) 5 ports (AD-10 output availuable: 2 of 5 ports) IEC61162 output: HDT, THS ROT, ZDA, GGA, VTG, RMC, GBS, DTM, GSA, GSV, GNS, MSS, GST, GLL, ALR, ATT, HVE
	Current data input	1 port(CUR, VBW)
	Alarm contact signal	2 ports (alarm output) 1 port (ACK input)
	LOG pulse	1 port (off , 200p/NM, 400p/NM)
	Protection	IPX4
	Ambient conditions	-15 to +55°C (operational) -25 to +70°C (strage)
Power		12 to 24V DC (-10% to +30%)
Power consumption		12W (including sensor), 6W (excluding sensor)
Vibration/EMC		IEC60945 ed4
Options
Rectifier		NBG-320
Data cable (for serial data)		CFQ-5374 (3m), CFQ-5374-15 (15m)
Data cable (for contact signal)		CFQ-5404 (3m), CFQ-5404-15 (15m)
Extention cable (sensor-display)		CFQ-7249 (20m), CFQ-7249-10 (10m)
Junction box		NQE-7720
Data cable (for sub display)		CFQ-7251 (1.5m Y-cable)
Data cable (for JRC Radar)2		CFQ-5469 (10m)
Data cable (for beacon receiver)		CFQ-7250
Mount base (for NNN-21)		MPBX44117

• 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
• Accepted for JMA-3300/5100/5200/5200MK2/5300/5300MK2 series