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1.1 Function
The JRC JLN-650/652 is a Doppler Current Meter that transmits the supersonic wave from the transducer
equipped with the ship bottom to the sea bottom, measures information necessary for operation such as
a absolute tidal current, a relative tidal current, bottom tracking ship speed, and water tracking ship speed
from the signal reflected by the sea bottom or the plankton in the sea etc. , and displays it in high
resolution color LCD.
1.1.1 Function of This System
The JLN-650/652 displays a fish finder image in four direction: port ahead, starboard ahead, port astern
and starboard astern at the same time, besides information necessary for fishing operation like a
absolute tidal current, a relative tidal current, bottom tracking ship speed, and water tracking ship speed
is displayed at the same time. In addition, the water temperature graph and the wind direction speed of
the wind graph can be displayed from the input of the water temperature data and the wind direction
speed of the wind data from the outside.
The current screen displays at the same time for the ship course and the direction/speed of the current in
five layers that sets depth beforehand.
The depth setting of the each level can be set within the range of 2-500m(*1). As for the current display,
the speed display is switched to a numeric display and the echo graph display.
The ship speed screen displays the trip distance and the ship course except the numerical value display
and the graphical display, and it has the function as ship speed meter.
The shoal of fish screen displays the shoal of fish image in four directions on division into four, division
into two, and one screen. The JLN-650/652 displays the same image as a usual fish finder can be
displayed in sensitivity and the bubble cancellation with the knob.
The graph screen displays the change for the current direction and speed of the current in five layers, and
depth, ship speed, water temperature and wind speed in the graph.
The track plot screen displays the current speed of the current in five layers on the own track in the
vector.
The profile screen in real time displays the current in 100(JLN-650)/50(JLN-652) layers or less in the
graph. There are a line graph and an ellipse graph display in the profile screen, and in the ellipse graph
display, the flow speed of the current in 100(JLN-650)/50(JLN-652) layers is confirmed and can the twist
and swinging of the current can visually be confirmed by displaying the vector on the ellipse.
*1: The depth that can be measured is different according to the oceanographic condition, and maximum depth is about
160(JLN-650)/100(JLN-652)m for this device.
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