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JRC JLN 550 Doppler Log Display Model NWW‑60
This is a display unit used as part of a JRC Doppler Log (speed log) system — typically paired with a Doppler sonar and processor to measure a vessel’s speed and distance through water.
The NWW-60 designation refers to the main display panel for the JRC Doppler log system (often seen with systems like the JLN-550 Doppler Sonar / Speed Log).
The display converts the Doppler measurement data into readable outputs such as:
Speed through water
Distance run
Other speed log information relevant for navigation and voyage records
Display type: Digital numeric / alphanumeric display (exact size/resolution unspecified for NWW-60)
Indications displayed:
• Speed through water (STW)
• Distance run
• Possibly status/functions from the log (system, alarms, inputs)
Input interface: Likely receives processed serial data (e.g., IEC-61162 / NMEA log outputs) from the log processor unit (e.g., NJC-24).
Power supply: AC (100/110/115/220/230 VAC, ±10%), single-phase — typical for JLN-550 systems (which include the NWW-60 display).
Power consumption: Part of overall Doppler log system power; main display itself draws a portion of system power (e.g., system ≤300 VA total).
Operating temperature: ~-15 °C to +55 °C
Humidity: Up to ~93 % non-condensing
While the display unit itself displays data, the attached log system provides interfaces including:
Serial output: IEC-61162/NMEA sentences (VBW, VLW etc.) from the log processor
Log pulse outputs: Photocoupler signal (e.g., 200 pulses/NM)
Analog display interface: For external analog units (if supported)
Alarm outputs: System, speed, power alarms
Remote displays: May be supported via additional display ports
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