Chapter 5
CVS-841/851
Basic Operation
5.9.2 Fish alarm
The Fish Alarm is an audio alarm, which is activated when fish echoes enter a predetermined depth
range or fulfill the predetermined threshold in terms of its signal intensity and length. Pressing any key
on the operation panel can silence the alarm. Further detection of echoes will activate the alarm again.
Image Speed 1/1
14:22:56
2001/05/23 (Wed)
High
Shift
0 0
0
0
The upper depth alarm
being set to 80.
The lower depth alarm
being set to 180.
0
5 0
1 5 0
2 0 0
1 0 0
Image feed
Unalarmed object:
This fish school
fulfilled the signal
threshold but, was
outside the alarm
range.
This fish school activating the
alarm.
Unalarmed object:
This fish
school was within the range but
its color was set for rejection.
The fish alarm bar (white)
Alarmed object:
This fish
school was inside of the
alarm range and fulfilled
the signal threshold.
Unalarmed object:
This
fish school is within the
alarm range but less
than the specified
length
.
Figure 5.31 The Fish Alarm display
Setting procedure
Setting the Upper and Lower Fish Alarms:
(1) Press the MENU key to show the main menu.
(2) Press the up or down key to highlight FISH ALARM.
(3) Press the right arrow key to show FISH ALARM ON/OFF.
(4) Press the up or down arrow key to select FISH ALARM ON.
(5) Press the right arrow key to show UPPER FISH ALARM.
(6) Press the right arrow key to show the depth value window for UPPER FISH ALARM.
(7) Press the up or down arrow key to enter the MSB depth value.
(8) Press the right arrow key to shift the digit and again press the up or down arrow key to enter the
LSB depth value.
In a similar manner, set the Lower Fish Alarm.
When finished, the Fish Alarm bar will be set to indicate upper and lower alarm limit.
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