Furuno GP-3500F - Manual (Page 201)

11. VIDEO SOUNDER OPERATION
11-29
11.15.2 Fish alarm
The fish alarm sounds when a fish echo is within the preset alarm range. The
depth at which fish live depends on species season and time of the day. The fish
alarm can alert you when fish echoes are within a certain depth. Note that the
sensitivity of the fish alarm can be set on the ECHO SOUNDER SYSTEM
SETUP menu. For further details, see paragraph 11.18.
1. Press the [MENU] key to show the main menu.
2. Press the [6] key to show the ALARMS SETUP menu.
3. Rotate the [ENTER] knob to select FISH ALARM.
4. Press the [1] key to select “1. ON.”
5. Rotate the [ENTER] knob to select DEPTH of FISH ALARM.
6. Press the numeric keys to enter the starting point, and then press the
[ENTER] knob.
The starting point is the depth from the transducer. (See the figure shown on
page 11-27.)
7. Rotate the [ENTER] knob to select RANGE of FISH ALARM.
8. Press the numeric keys to enter alarm range, and then press the [ENTER]
knob.
9. Press the [MENU] key several times to close the menu.
At the right of the screen, the (white) alarm marker appears.
Note: To turn this alarm off, select “2. OFF” at step 4.