3Fish Alarm (Fish Size); 4Bottom Discrimination Alarm - Furuno GP-3700F Operator's Manual

11. ECHO SOUNDER
The alarm marker (yellow) appears at the left side of the bottom lock or bottom dis-
crimination display.
To disable the alarm, select [OFF] at step 4.
11.17.3 Fish alarm (fish size)
The fish alarm (fish size) sounds when a fish of the specified length appears. This
alarm is available when the [FISH INFORMATION] menu of the [ACCU-FISH SET-
TING] is set to [FISH SIZE].
1. Press the MENU key to open the main menu.
2. Select [6. ALARM SETTINGS].
3. Select [FISH ALARM] on page 3.
4. Select [ON].
5. Select [FISH SIZE].
6. Press the numeric keys to enter the fish size.
7. Press the DISP key to close the menu.
To disable the alarm, select [OFF] at step 4.
11.17.4 Bottom discrimination alarm
The bottom discrimination (seabed composition) alarm sounds when the bottom type
(rock, gravel, sand, mud) matches both the bottom type and probability percentage se-
lected. This alarm is available when the [SEABED COMPOSITION] menu of the [BOT-
TOM DISCRIMINATION SETTING] is set to [GRAPHIC] or [DETAILS].
1. Press the MENU key to open the main menu.
2. Select [6. ALARM SETTINGS].
3. Select [BOTTOM DISC. ALARM] on page 3.
4. Select [ON].
5. Select [SEABED TYPE TO DETECT].
6. Select bottom type to detect from [ROCK], [GRAVEL], [SAND] or [MUD].
7. Select [DETECTION ACCURACY].
8. Select detection probability percentage for the bottom selected at step 6 (setting
range: 50 to 90%).
9. Press the DISP key to close the menu.
To disable the alarm, select [OFF] at step 4.
11-26