shows a graph of the contrast. The screen will also show the effects of the
change. If you reach the maximum or minimum level, a tone sounds
alerting you to the limits. The menu will clear automatically after a few
seconds or you can press the PWR key to clear the screen.
ASP (Advanced Signal Processing)
ASP is a program embedded in the computer
that is specifically designed to eliminate noise.
It continually monitors the signals from the
receiver, determines which echoes are noise
and rejects them. This allows true target
echoes to display on the screen with a mini-
mum of clutter. This feature is especially
useful since it typically lets you operate the
boat at all speeds without adjusting the sensi-
tivity or other controls. When the unit is first
turned on, ASP is enabled. To turn ASP off,
press the menu key repeatedly until the ASP
menu appears. Now press the up arrow to turn it on or the down arrow to
turn it off. The menu will clear automatically after a few seconds or you can
press the PWR key to clear the screen.
A simulator is built inside that can show a
simulated bottom signal with fish signals. All
features of the unit work normally when the
simulator is in use. You can change the
range, zoom, and use the alarms as desired.
To use the simulator, press the menu key
repeatedly until the SONAR SIM menu ap-
pears. Now press the up arrow to turn it on.
Repeat the above steps to turn it off, or turn
the unit off and back on again.