Eagle Electronics Cuda 128 Portable - Manual (Page 48)

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CHART SCROLL SPEED
The rate that echoes scroll across the screen is called the
chart scroll speed. The default for this unit is "max" (100
percent); we recommend that you leave the scroll speed set
there for virtually all fishing conditions.
However, you might consider experimenting with chart
speed when you are stationary or drifting very slowly. You
may sometimes achieve better images as you slow down the chart speed
to match how fast you are moving across the bottom.
If you are at anchor, ice fishing or fishing from a dock, experiment with
a chart speed of 20 percent. If you are drifting slowly, try a chart speed
of 50 percent. When you are stationary and a fish swims through the
sonar signal cone, the image appears on the screen as a long line
instead of a fish arch. Reducing the chart speed may result in a shorter
line that more closely resembles a regular fish return.
Adjust scroll speed by pressing MENU until S CROLL S PEED
appears. Press
UP ARROW to increase it and press DOWN ARROW to decrease it. Press
PWR to clear the menu.
To return to the original setting, repeat the above steps, but use the
arrow keys to set the speed at
M
AX
before clearing the menu.
NOISE REJECT and ASP
 (Advanced Signal Processing)
The ASP
 (Advanced Signal Processing) feature is a noise
rejection system built into the sonar unit. It constantly
evaluates the effects of boat speed, water conditions and
electrical interference and automatically gives you the best
display possible under most conditions.
ASP 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