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The Surface Clarity Control (SCC) reduces or eliminates surface clutter
signals from the display. SCC varies the sensitivity of the receiver, de-
creasing it near the surface and gradually increasing it as the depth in-
creases.
There are three levels of SCC available on this
unit: low, medium, and high. When it’s turned on
for the first time, the SCC level is low. To change
it, press the MENU key, then select “SONAR
OPTIONS”. The screen at righ appears. Use the
up or down arrow keys to select the SURFACE
CLARITY menu. Now use the left or right arrow
keys to change it. When you’re finished, press
the EXIT key to erase the menus.
ASP (Advanced Signal Processing)
The ASP feature is a noise rejection system that constantly evaluates the
effects of boat speed, water conditions, and interference. This automatic
feature gives you the best display possible under most conditions.
The ASP feature is an effective tool in combating noise. In sonar terms,
noise is any undesired signal. It is caused by electrical and mechanical
sources such as bilge pumps, engine ignition systems and wiring, air
bubbles passing over the face of the transducer, even vibration from the
engine. In all cases, noise can produce unwanted marks on the display.
The ASP feature has two levels - Normal and High. If you have high noise
levels, try using the “High” ASP setting. However, if you are having trouble
with noise, we suggest that you take steps to find the interference source
and fix it, rather than continually using the unit with the high ASP setting.
However, there are times when you may want to turn the ASP feature off.
This lets you view all incoming echoes before they are processed by the
ASP feature.
To change the ASP level, press the MENU key. select "SONAR SETUP",
then “SONAR OPTIONS”, and finally press the up or down arrow keys
until the “ASP” menu appears, as shown at the top of this page. Now use
the left or right arrow keys to change it. When you’re finished, press the
EXIT key to erase the menu.
RANGE - Automatic
When turned on for the first time, the bottom signal is  automatically placed
in the lower half of the screen. This is called Auto Ranging and is part of
the automatic function. Typically, the range cannot be changed manually