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When in DEEP WATER the Fish Finder display is showing a very shallow bottom or
digital readout this may happen because in conditions of strong Surface Clutter the
Fish Finder may erroneously look on to the Surface Clutter. To solve this situation try
to increase the STC to LONG or to CUSTOM increasing the STC length and strength.
When in DEEP WATER the Fish Finder doesn't see the bottom, this may happen
because the bottom is out of range or is very near to the maximum depth that can be
tracked by the Fish Finder. In the latter case this may happen if the bottom
composition is soft as mud, if the sea conditions are bad, there are thermoclines or
the water is full of suspended materials (silt, plankton). All these factors may affect
considerably the performance of the Fish Finder to be able to see the bottom. In these
cases change the RANGE MODE from AUTO to MANUAL Range and manually
adjust the depth range until the bottom echo becomes visible on the Fish Finder
display.
17.11.2
Surface Noise Filter
An automatic filter that attempts to remove Surface Clutter that causes the screen to be
filled up with strong return echoes just below the surface. It may seem that the same
functionality could be achieved using on the STC control however there is main difference
between such control in fact the STC control impacts the capability to detect and track the
bottom and is not designed to cancel completely the surface noise, on the other side the
Surface Noise Filter attempts to cancel completely the surface noise but it doesn't affect
the capability to detect and track the bottom. Filter gradually attenuates surface noises. The
Surface Noise Filter has 9 settings: OFF, 1, ..., 8. When set to 1 the Surface Noise is attenuated
from surface down to a depth of 5 Ft, increasing the Surface Noise increases the depth in which
the Surface Noise is attenuated as well as the attenuation level increases; when the preset
is set to 8 the attenuation is maximum and is applied from surface level down to a depth of 255
Ft, as shown in the Surface Noise Filter Table reported below:
17.12 DISPLAY SETUP
Allows the Fish Finder's display page appearance to be changed.
Page 128
Figure 17.11.2 - Surface Noise Filter Depth table
Figure 17.12 - Display Setup Menu
CP390i and CPF390i
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