In such conditions, false switching of the device to an incorrect, inappropriate
scale is possible (this happens when garbage or fish is taken for the bottom).
NOF (Noise and Object Filter)
The correct application of this parameter allows to get a more decipherable
picture for a given place on the sonar screen. Six NOF values are available for
selection, from 1 to 6. The higher the NOF value, the less sensitive the device. That
is, at high NOF values, the smallest objects will not be displayed on the screen;
their echo signals will be jammed. Conversely, the lower the NOF, the smaller
objects will be displayed. The default NOF value is 3.
In this case, at each NOF level, gain can be adjusted using the sensitivity
scale. Combining sensitivity adjustment (from 0 to 28 units) and NOF (from 1
to 6 units), you can always achieve the desired image on the screen.
Using the NOF adjustment, you can also select the desired width of objects
in the ZOOM window. With NOF=1, objects are displayed with wide lines, with
NOF=5 or 6, objects are displayed with narrow lines or not displayed at all in
the ZOOM window.
ZOOM WINDOW
The ZOOM mode is intended for a detailed examination of the bottom
layer, or rather, objects located in this layer.
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