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For example, press the key next to the "Depth" label two times to switch
from feet to meters. This moves the check mark two times from the “Ft” to
the “M”.
After setting the units of measure, press the CLR key.
MENU - PAGE 3
SURFACE CLARITY
The markings extending
downward from the zero line
on the 2D chart when the
manual mode is on are called
“surface clutter.” These mark-
ings are caused by wave ac-
tion, boat wakes, temperature
inversion, and other natural
causes.
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. The maximum depth that SCC will affect is 75% of the selected
depth range. For example, on a 0-60 foot range with maximum SCC, sur-
face clutter will be reduced down to about 45 feet.
There are three levels of SCC available on the X-70A 3D: 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 three times, then press the key adjacent
to the “SCC” label until the check mark is on the desired SCC level. Press
the CLR key when you’re finished.
ASP (Advanced Signal Processing)
The ASP feature is a noise rejection system built into the X-70A 3D that
constantly evaluates the effects of boat speed, water conditions, and in-
terference. This automatic feature gives you the best display possible un-
der 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.