Yachting Electronic Co. NAKI8850B, Руководство пользователя

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Sensitivity Sensitivity
Sensitivity determines how echoes will be displayed on the
screen.
Increasing the sensitivity will make you see more details
on the screen. In such situations when you see too much
clutter on the screen, decreasing the sensitivity will play
an effect. The larger the sensitivity is, the more relatively
strong sonar returns the screen will display. If the sensitivity
is decreased too low, most sonar returns (which maybe fish)
will not be displayed.
In situation while water is clear or very
deep, try increasing the sensitivity,
which will let you see even the very
weak returns.
However in situation while water is
turbid, try decreasing the sensitivity,
which will make only the useful echo
be showed on the screen and the noise will be omitted.
To set the Sensitivity: