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Home > Electronics > Doppler Current Meter >
JRC JLN-650 Doppler Current Meter without Monitor

JRC JLN-650 Doppler Current Meter without Monitor

Availability: Contact us for availability

Brand New with Factory Warranty

Ship only via Ground Freight Rate. No Flat Rate.

JRC JLN-650 Doppler Current Meter without Monitor
jln-650List Price: $US 17,488.90Our Price: $US 14,068.95


Twist display

You can view the current direction and speed in up to 100 layers with the twist mode. With this advanced feature, an operator is able to anticipate current speed and direction, enhancing the timing on when to deploy the nets in the water. Naturally, the twist display mode is accompanied with a wide range of information, such as current speed range, depth range, temperature and so on.

Five depth layers

The JLN-650 Doppler current meter allows continuous display of tidal currents at five depths layers (A,B,C,D,E) simultaneously, of which each layer is measured in four directions: port ahead, starboard ahead, port astern and starboard astern. The user can select the depth of each layer, showing different information. You can also select bearing 1 displayed as North-up (with true north at the top of the display) and Head-up (with bow at the top of the display)

Bottom layer auto shift

The bottom layer (E) has the ability to automatically shift and display the measuring depth according to the ups and downs of the sea bottom. This is a great source of information for efficient fishing and for the safety of your nets.

Automatic bottom current tracking

Normally run automatically, the new JLN-650 allows bottom tracking with depths up to approximately 400 meters 2, measuring direction and speed relative to the sea bottom. If sea bottom becomes too deep, it automatically switches to water tracking mode or through GPS mode, depending on user selection.

Fish finding

You can view fish echoes in four-directions, two-directions ahead, or in any one direction, allowing for easy fish tracking. Just as any typical fish finder, you can set the display to the type of fish or sea conditions simply by adjusting the sensitivity.

  • Heading input necessary
  • Maximum tracking depth may vary according to sea bottom conditions

Easy operation

Display mode

This Doppler current meter has 15 comprehensive and easily readable display modes for efficient tidal analysis. With our dedicated keyboard you can navigate through all common used tasks effortlessly.

Dedicated keyboard

The new JLN-650 allows you to carry out all operations simply by using the keyboard. The layout has a full complement of keys, including direct STC and GAIN, to adjust noise under surface of the water level and receiver sensitivity respectively. The keyboard also has one-touch menu keys to access different display modes instantly as well as a special frame-selector to navigate quickly through a variety of menu items on display.

Easy interfacing

The new Doppler current meter integrates two-way interfacing, allowing you to easily connect a wide range of additional (NMEA) navigation equipment. Up to 1000 memory points of current and track data can be saved on USB memory.


There are a wide range of alarms available on the JLN-650. With all alarms, for example, when depth becomes shallower than the parameter set, a warning message pops up, allowing the operator to take action, contributing to safer navigation and more efficient fish finding.


Black box configuration

The JLN-650 consist of a display, signal processor and keyboard, allowing for a flexible installation approach in confined spaces. For those who prefer to specify their own display, the JLN-650 allows you to choose what type and size of display to connect to the unit. You can choose between LCD and CRT, as long as it supports XGA.


JRC's new Doppler current meter operates with a new 125 kHz transducer, designed to minimize side lobes. The transducer is available with a stuffing tube, both for iron and FRP hull installations. The standard transducer cable length of 25 meters can be extended to a maximum of 100 meters. (special cable required)

System diagram


Name Doppler Current Meter
Model JLN-650
Measuring method 2-axis four beam pulse Doppler
Frequency 125 kHz
Screen 1024 by 768 pixels (XGA)
Power supply AC 100V to 230V (50Hz/60Hz, single phase)
Power consumption < 270VA
Current measurement performance
Current speed range 0kt to 10kt
Current measuring accuracy maximum 2%rms or 0.2kt, whichever is greatest
Current direction display 360 and numeric values with 32 bearing points
Measurement layers up to 100 layers (5 layers numerical)
Minimum measurement depth of layer 8m (short pulse mode), 12m (normal pulse mode), 16m (long pulse mode)
Maximum measurement depth of layer1) 160m (Tx power = standard), 200m (Tx power = high)
Minimum measurement depth of bottom 26m (short pulse mode), 34m (normal pulse mode), 42m (long pulse mode)
Setting depth range 5m to 500m
Current reference Doppler or GPS
Measuring mode relative or true
Ship speed measurement performance
Fore/aft range -10kt to 40kt
Port/starboard range -10kt to 10kt
Ground speed depth2) 5m to 400m
Measurement accuracy ± 1%rms or 0.1kt, whichever is greatest
Water speed depth more than 20m (ground and water speed simultaneous display)
Distance run range 0NM to 99999.99NM
Distance run accuracy ± 1%rms or 0.1kt
Main performance
Function measuring current, ship speed, depth, fish finder, track plotting, graph display,profile display, self test, alam function (current speed, ship speed, trip, timer, water temperature)
Display modes current, ship, plot, graph, fish, profile
Numeric display current speed, current indication (absolute 5 layers, relative 4 layers), measurement depth, bottom tracking ship speed/course, water tracking ship speed/course, ship position, heading, trip, date, FA ship speed/PS ship speed, trip or time value, water depth, water temperature
Graphic display absolute/relative current vector, ship speed vector, water temperature graph, current/depth graph, ship speed graph, wind speed, wind direction graph, trip display, fish display, profile display
NMEA input (v1.5 to 3.01) bearing (HDT, VHW, HDM, HDG, THS),
lat/long (RMC, GGA, GLL, VTG),
water temp (MTW), wind direction (MWD, MWV)
External trigger input transmission trigger
NMEA output (v1.5 to 3.01) ship speed current (VDVBW, VDVLW, VDVHW, VDDBT, VDDPT, VDCUR, PJRCL)
Distance output 4x log pulse (200 pulse/NM)
JRC output JRC format (for current data output)
Memory data output USB port (up to 1000 memory points of current and track data can be saved)
Operating temperature -15 to 55C
Relative humidity 0% to 93% non-condensing
Transducer with stuffing tube (iron tank) NKF-775
Transducer with stuffing tube NKF-774
Transducer element (125 kHz) CFT-068A
Stuffing tube (for iron hull) MPJD30076
Stuffing tube (for FRP hull) MPJD30078
Monitor mount kit for NWZ-164 MPBX42944
Sun shade MPOL30369
  • 1) Measurement depth is 80% or less of depth
  • 2) Depths may vary according to sea (and sea bottom) conditions

What's included?

  • 15-inch Display*1
  • Transducer
  • Signal processor
  • Keyboard
  • Cables
  • Spare parts
  • Manual(English)


Cables included
Signal cable 5m (display to processor)*1
Power cable 5m (display to processor)*1
Signal cable 5m (keyboard to processor)

*1 Not included in black box configuration



**The price is subject to change at anytime without any notice.  We are not responsible for any typographical errors.  Any products can be cancelled from sale at any time.

** All Products sold here are Brand New unless specified Otherwise and come with Full Manufacturer's Warranty

WarningWARNING: This product can expose you to chemicals including Di-n-hexyl Phthalate (DnHP) which is known to the State of California to cause reproductive harm, and Vinyl Chloride which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov. __________________________________________________________________________________________


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