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3. ADVANCED SONAR OPERATION
3-3
3.3 The Fish Alarm
The fish alarm generates an audio alarm when a fish echo above a certain strength
enters the alarm zone.
1. Operate the trackball to place the trackball mark on the starting point of the alarm
zone.
2. Press the ALARM ZONE key.
3. Operate the trackball to place the trackball mark on the starting point of the alarm
zone.
4. Press the ALARM ZONE key.
The display paints a fan-shaped alarm zone. The audio alarm will be released
when an echo enters the alarm zone.
Fish alarm zone
Note 1: 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) below. Otherwise, a
360° alarm zone is painted as in (c) and (d).
Fish alarm zones
Note 2: You may set the echo strength level which will release the audio alarm with
[ALARM LEVEL] on the [SONAR] menu. The setting range is 0-14.
Note 3: To show or erase the alarm zone, press the FISH ALARM key.
Starting Point
Ending Point
Alarm Area
More than 3°
Within 3°
(a) (b) (c) (d)