JRC JLR-31 GPS Compass
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.
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
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.
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.
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
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.
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).
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
- 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
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
Standard in the box
- Installation parts
- Spare parts
*The cable length may vary depending on sales region.
All specifications are subject to change without notification.