53
Battery Alarm menu (left). Low Battery Alarm Value (right).
To move the cursor back to any of the previously entered numbers,
press
MENU UP
. Press
PWR
to return to the Battery Alarm menu. Use
↑
to select
O
N
, which will turn on the alarm, then press
PWR
to clear the
menu. If the voltage value falls below the alarm’s setting, the alarm
will sound and a message will appear on the screen.
Noise Rejection and ASP
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 automati-
cally 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, wiring, air bubbles passing
over the face of the transducer and even vibration from the engine. In
all cases, noise can produce unwanted marks on the display.
The ASP noise rejection feature is especially useful because, typically,
it lets you operate the boat at all speeds without adjusting the sensi-
tivity or other controls.
