GPS Compass/GPS Navigator JLR-31/JLR-21

Description

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

	GPS compass	Gyro compass	Magnetic compass
Periodic maintenance	No	Yes	Yes
Setting time	typically 30 seconds	about 4 hours	no
Tracking response	High speed	Middle speed	Low speed
Accuracy	Good	Good	Bad
Magnetis influence	No	No	Yes
Correction	No	Yes for latitude	Yes for variation, deviation

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.

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).

Spesification :

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

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