Lowrance LMS-350A, Installation And Operation Instructions Manual

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34
ASP (Advanced Signal
Processing)
The ASP feature is a noise
rejection system built into the
LMS-350A that constantly
evaluates the effects of boat
speed, water conditions, and
interference. This automatic
feature gives you the best dis-
play possible under most con-
ditions.
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 allows you to view all incoming echoes before they are processed by
the ASP feature.
To change the ASP level, press the MENU key, then press the key next
to the "More" label until the fifth menu page appears. Then press the key
next to the “Level of ASP” label until the desired level is obtained.
SYSTEM INFORMATION
The System Information menu
gives you the date and revision
number of the software used int
the LMS-350A. To view this
menu, press the Menu key, then
press the key next to the "More"
label until the fifth menu page
appears. Now press the key
next to the "System Informa-
tion" label. A screen similar to
the one at right appears. To
return to the sonar screen, press the key next to the "Exit" label.