SONAR User Manual

7-8
The Fish Alarm
The fish alarm sounds an audible alarm when a fish echo above
a preset strength enters an alarm zone. You set parameters for
the fish alarm at ALM on the data setting window.
ON/OFF: Turn alarm on or off.
Level: Set echo strength level which will activate the alarm.
Zone: Set alarm zone.
1. Open the data setting window and select ALM•AUDIO.
2. Press the + key of the ZONE item.
3. Operate the trackball to place the trackball mark on the start-
ing point of the alarm zone.
4. Press the + key.
5. Rotate trackball clockwise to select the end point. The dis-
play paints a fan-shaped alarm zone.
6. Press the + key.
Starting
point
End
point
Alarm
zone
Figure 7-6 How to set the fish alarm zone
Note: There must be at least three degrees difference between
the starting and end points to get a fan-shaped alarm zone as
shown in (a) and (b). Otherwise, the unit paints a 360 degree
alarm zone as in (c) and (d).
More than 3°
Within 3°
(a) (b) (c) (d)