Eagle Electronics SeaFinder 250 DF - Manual (Page 54)

50
Battery Alarm menu (left). Low Battery Alarm Value (right).
Press the ↓ to
S
ET
V
ALUE
. The Low Battery Alarm Value dialog box will
appear. Input a voltage value between 7 and 18 volts. Use the ↑ ↓ keys
to enter the first number in the dialog box, then press
MENU DOWN
to
move to the next digit. Repeat those steps until the desired value has
been entered in the dialog box. 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 be-
low the alarm’s setting, the alarm will sound and a message will ap-
pear on the screen. Press
PWR
to silence the alarm.
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