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The JRC JLN-741N is an IMO type-approved, dual-axis Doppler Speed Log designed for commercial vessels of 50,000 GT and above. The “N” designation denotes the 3-unit standard system configuration—consisting solely of the main display, signal processor, and transducer unit, omitting the separate distribution processor found on the “A” variant.
Operating on a high-frequency 2 MHz dual-beam pulse Doppler system, the JLN-741N provides precise Speed Through Water (STW) tracking across both longitudinal (fore/aft) and transverse (port/starboard) movement axes. This dual-axis measurement capability is critical for safe berthing and precise maneuvering of large vessels in confined waterways.
Streamlined 3-Unit Architecture (Model N): Eliminates the NQA-7040 distribution processor to reduce panel space, cabling overhead, and overall installation complexity while retaining core dual-axis tracking capabilities.
Dual-Axis Speed Tracking: Simultaneously tracks longitudinal (fore/aft) speed and transverse (port/starboard) speed components to provide dynamic speed vectors for docking operations.
Dual-Beam 2 MHz Ultrasonic Engine: Employs high-frequency Doppler signal processing to deliver high accuracy ($\pm 0.03\text{ knots}$ stability) even during low-speed maneuvers.
Integrated Bubble Detection: Real-time acoustic signal analysis monitors transducer face contact and flags warnings if hull aerated water interferes with tracking accuracy.
Color Touch Screen Interface: Equipped with the NWZ-510SDW 5.1-inch color touch-panel LCD display featuring intuitive touch navigation and adjustable day/night color modes.
JRC RMS Ready: Connects via LAN to JRC’s Remote Maintenance System (RMS) for automated remote health diagnostics and service logging.
| Category | Component / Feature | Technical Details |
| System Model | Model Identifier | JRC JLN-741N (3-Unit Dual-Axis System) |
| Measuring Principle | System Type | Dual-Axis 2 MHz Pulse Doppler Speed Log (Speed Through Water) |
| Measurement Axes | Longitudinal (Fore / Aft) & Transverse (Port / Starboard) | |
| Speed Measurement Range |
• Fore / Aft: -10.00 to +40.00 knots • Port / Starboard: -9.99 to +9.99 knots |
|
| Depth Below Transducer | Effective measuring depth $\ge$ 3.0 meters below transducer face | |
| Speed Accuracy | $\pm 1\%$ or $\pm 0.1$ knots (whichever is greater) / $\pm 0.03\text{ kn}$ stability | |
| Distance Accuracy | $\pm 1\%$ or $\pm 0.1$ NM/hour | |
| Display & Controls | Main Display Unit | NWZ-510SDW (5.1″ Color LCD, 480 x 800 resolution with Touch Panel) |
| Distance Display Range | 0 to 99,999.99 NM | |
| System Units (3-Unit Set) | Core Modules |
1. Main Display (NWZ-510SDW) 2. Signal Processor (NJC-70S) 3. Transducer Unit (Flat type NKF-547 or Gate Valve type) |
| Interfaces & Connectivity | NMEA Output Ports | 4 x IEC 61162-1 / NMEA 0183 Outputs (VBW, VLW sentences) |
| NMEA Input Ports | 1 x IEC 61162-1 GPS Input (RMC, ZDA) | |
| Pulse Outputs | 2 x Contact Closure Log Pulse Ports (200 pulses/NM) | |
| Network & Remote Ports | 1 x LAN Port (JRC RMS Support), 1 x Remote Display Port | |
| Alarm Relay Outputs | System Fail, Power Fail, and Speed Limit relay contacts | |
| Electrical & Physical | Power Supply Input | 100 / 230V AC $\pm 10\%$ (50/60 Hz) |
| Power Consumption | $\le 50\text{ W}$ (60 VA at 100V / 150 VA at 230V) | |
| Operating Temperature | -15°C to +55°C | |
| Standards & Compliance | Certifications | IMO MSC.96(72) Compliant, MED Wheelmark, IEC 61023, IEC 60945 |
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