JRC Doppler Sonar JLN – 550
JRC
Refurbished
| Item | Details |
|---|---|
| Manufacturer | Japan Radio Co., Ltd. (JRC) |
| Country of Origin | Japan |
| Product Type | Doppler Sonar Berthing Aid System |
| Model | JLN-550 |
| Technology | Doppler Ultrasonic Sonar |
| Application | Docking, Berthing & Vessel Maneuvering |
| Installation | Bridge Console & Hull-Mounted Sonar Transducers |
| Interface | NMEA / Navigation System Integration |
| Compliance | IMO Navigation Equipment Standards |
The JRC JLN-550 Doppler Sonar is a specialized marine maneuvering support system designed to assist ship masters and pilots during docking, undocking, and low-speed maneuvering operations. By utilizing advanced Doppler sonar technology, the system provides precise measurements of vessel movement in longitudinal and transverse directions, significantly improving berthing safety.
Modern commercial vessels often operate in congested ports where accurate vessel movement information is critical.
The JRC JLN-550 Doppler Sonar provides real-time data regarding:
The system is widely installed aboard:
Its primary purpose is to provide highly accurate maneuvering information when approaching berths, terminals, jetties, and offshore installations.
The display unit continuously presents vessel movement vectors, allowing bridge personnel to monitor ship motion with exceptional accuracy during critical operations.
A Doppler Sonar uses ultrasonic signals transmitted through the ship's hull.
When the ultrasonic signals reflect from the seabed or suspended particles in the water, the system measures the frequency shift (Doppler Effect).
Using this information, the JLN-550 calculates:
Displays lateral movement at the bow.
Displays lateral movement at the stern.
This information is particularly valuable during berthing operations where movement of only a few centimeters per second can determine operational safety.
Provides precise vessel movement information during docking operations.
Displays independent lateral movement at both bow and stern sections.
Measures vessel movement in the longitudinal direction.
Displays transverse vessel motion.
Optimized for low-speed maneuvering environments.
Provides clear visibility for bridge personnel.
Tracks cumulative distance travelled.
Monitors system health continuously.
Supports communication with:
Installed on the bridge.
Processes sonar signals and calculates vessel movement.
Installed below the waterline.
Provides integration with shipboard navigation systems.
Ensures stable operation of the complete system.
The JLN-550 is commonly used for:
Assists pilots and masters during vessel berthing.
Monitors safe departure from terminals and piers.
Provides precise movement information during loading and unloading.
Supports safe approach to oil terminals.
Assists vessel maneuvering near offshore structures.
Provides additional vessel motion information.
Improves safety in narrow channels and confined waters.
Proper maintenance is critical for reliable berthing performance.
During dry docking:
Recommended:
Even with modern GPS and positioning systems, Doppler Sonar remains indispensable because:
GPS often lacks the precision required for docking operations.
Provides vessel movement information unavailable from conventional speed logs.
Reduces docking risks and potential damage.
Provides critical information during maneuvering.
Many terminals prefer vessels equipped with berthing aid systems.
Provides objective vessel motion measurements.
To provide accurate vessel movement information during docking and maneuvering operations.
Yes. It measures both longitudinal and transverse vessel movement.
Yes. One of its major advantages is independent bow and stern motion monitoring.
The system is primarily optimized for low-speed maneuvering and berthing operations.
Yes. The JLN-550 can provide motion data to integrated bridge systems and ECDIS platforms.
The JRC JLN-550 Doppler Sonar is an advanced marine berthing aid system designed to provide highly accurate vessel movement information during docking and maneuvering operations. Featuring bow and stern motion monitoring, fore-aft speed measurement, transverse movement detection, and integrated navigation interfaces, the JLN-550 is a trusted solution for improving safety and precision in port operations.
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