Eagle Electronics SEAFINDER 500C - Manual (Page 60)

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At left, Sonar Menu with Sonar Features selected. In the Sonar
Features menu, Noise Rejection is selected with ASP in the default low
setting (center, dual-frequency menu; at right, single-frequency menu).
To change the ASP level:
1. From the Sonar Page, press MENU |
↓ to
S ONAR F EATURES
| ENT .
2. Press
↓ to
N
OISE
R
EJECTION
| ENT .
3. Press
↓ or ↑ to select a setting, then press
ENT .
4. To return to the previous page, press EXIT | EXIT .
Alarms
This unit has three different types of sonar alarms. The first is the Fish
Alarm. It sounds when the Fish I.D.
 feature determines that an echo
is a fish.
Another alarm is the Zone Alarm, which consists of a bar on the side of
the screen. Any echo on the chart that appears inside this bar triggers
this alarm.