7. FISH FINDER
7-13
7.9.3 Alarm sensitivity
You can select which strength of echoes release the fish alarms.
1. Select [Menu] on the menu icon bar to open the main menu.
2. Select [Sounder] - [Fish Alarm Level].
3. Select which echo strength releases the fish and bottom lock alarms.
[Low]: Light-blue or stronger echoes
[Medium]: Yellow or stronger echoes
[High]: Red and reddish-brown echoes
4. Select [Close] to exit the menu.
7.10 ACCU-FISH
TM
The ACCU-FISH
TM
feature estimates the length of each fish and shows a fish symbol
and depth value or fish length. This feature requires appropriate transducer and either
Network Sounder BBDS1 or DFF series.
Application consideration
• The information given by this feature is intended for reference only.
• ACCU-FISH
TM
uses both low and high frequency echoes for the measurements re-
gardless of the frequency mode in use.
• The intensity of an echo depends on fish species. If the indicated length is different
from the true length, you can apply an offset in the [Sounder] - [ACCU-Fish Size
Correction] menu of the main menu.
• 50 kHz and 200 kHz beams are transmitted alternately without reference to the cur-
rent display mode.
• To reduce the error, the detection area must be 2 to 100 meters from the surface.
• The signal attenuation on the inside-hull transducer is different between 50 kHz and
200 kHz. This attenuation causes some fish to get ignored and the fish length indi-
cated can be shorter than the true length.
• Echoes from a school of fish can be in more than one layer, which can cause wrong
length indication.
• The fish symbol indication is not shown when the bottom echo does not appear on
the screen.
Low
Medium
High
Fish Alarm Level
Medium
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