Terminology CVS-841/851
Operation Manual
Simulator
A simulated sonar video image shown on the screen, which is useful to get the hang of the sounder
operation before using it in the field.
Sonic Correction
The correction method of a deviated depth display caused by the change of water temperature or
salinity.
Subtraction Mode
A video processing method to discern a weak fish school in a mixed image containing a large mass of
a fish school. This is done by subtracting LOW frequency video from HIGH frequency video. If the
resultant echoes are displayed in similar colors as the HIGH frequency echoes, this result suggests
the majority of the fish species is sensitive to HIGH frequency transmission, i.e. the detected fish
school could be small fish like young sardine. If the resultant colors are shown in different colors from
HIGH frequency transmission, it indicates the fish school is sensitive to LOW frequency, therefore, a
larger size of fish species.
Synchronization with External Sounder
This function is used to reduce interference from other sounders operated on the same ship by
synchronizing the transmission timing.
Through-hull Installation
A method of transducer installation; transducer is installed on the bottom of the hull.
Upper Depth
The upper limit depth defined in a specific partial zoom mode. If any fish school or the seabed lies in a
shallower depth than this depth, it is not detected as a seabed.
VRM (Variable Range Marker)
A movable depth marker shown in a green line, used to measure the depth in higher accuracy.
White Line
The bottom surface is shown in a white band shape. This feature is useful in discerning a school of
fish near the seabed.
Zoom Start Depth (Upper depth limit)
The upper depth limit from which partial zooming starts.
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