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Doppler Current Meter


About Project:

Doppler current meter

A compelling combination of function and features



The new JLN-652 Doppler current meter integrates a compelling combination of function and features, packed into a compact space-saving design, enabling quick and accurate acquisition of speed and tidal current data.

JLN652_3dtwist3D twist mode

You can view the current direction and speed in real time with the twist mode. With this advanced feature, an operator is able to assess 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 history from external sensor and more.

Up and down currentJLN652_current

JRC engineers listened closely to feedback given by captains and realized yet another unique function in this class of current meters. The JLN-652 is able to accurately measure up and down current, particularly useful to predict the sinking ratio of your nets by following the natural motion of the underwater current.

50 independent measuring layers at deep current

The JLN-652 Doppler current meter has the ability to process and display continuous tidal currents of 50 independent measuring layers down to maximum 200 meter depending on sea condition. To simplify matters, the user only has to set five depths layers (A, B, C, D, E), of which each layer is measured in four directions. The 50 layers are automatically set relative to depth which has been indicated. The user can select the depth of each layer, showing different information. You can also select bearing1 (heading input necessary) displayed as North-up (with true north at the top of the display) and Head-up (with bow at the top of the display).

Automatic speed relative to bottom

Normally run automatically, the new JLN-652 allows bottom tracking with depths up to approximately 2502 meters (actual depth value depend on sea and bottom condition), 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.

Bottom current tracking

The bottom current layer (E) has the ability to automatically shift and display the current close to bottom following the contours of the sea bottom. This is of great help for the operator when fishing in areas with frequently variable depth.

JLN652_kbDedicated keyboard

The new JLN-652 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.

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 present fish echo and seabed condition simply by adjusting the sensitivity.


There is a wide range of alarms available on the JLN-652. 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.

High resolution display

The Doppler current meter not only measures data with unmatched accuracy but also features a high resolution output of 1024 by 768 pixels (XGA) which provides excellent and efficient tidal analysis.

JLN652_ifBlack box configured

The JLN-652 consists of a display (option), processor and keyboard, allowing for a flexible installation approach in confined spaces. For those who prefer to specify their own display, the JLN-652 allows you to choose what type and size of display to connect to the unit, as long as it supports XGA.

Display modes

This Doppler current meter has 16 comprehensive and easily readable display modes for efficient tidal analysis. With our dedicated keyboard you can navigate through all common used tasks effortlessly.

JLN650_displayUpgrade path

Our standard scope of supplJLN652_upgradey has been set as a minimum configuration. This allows ease of upgrading from previous models (see right). In the case of a new installation, simply select the transducer and installation accessories from the option list.

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. (USB not included).JLN652_box

  1. Heading input necessary
  2. Actual depth value depend on sea and bottom conditionBottom