Furuno FCV-1200L Operator's Manual page 42

Alarm area
12.5
10. Press the [ ] key to select ALARM ZONE.
11. Press the [-] or [+] key to show the alarm zone setting window.
12. Press the [-] or [+] key to set the alarm zone.
For depth alarm and temp alarm, go to step 16. To set the fish alarm, go to step 13.
13. Press the [ ] key to select ALARM LEVEL.
14. Press the [-] or [+] key to show the level setting window.
15. Press the [-] or [+] key to set the alarm level.
MIN: Alarm triggered against light-blue or stronger fish echoes.
MID: Alarm triggered against yellow or stronger fish echoes.
MAX: Alarm triggered against red or stronger fish echoes.
16. Rotate the [FUNCTION] switch fully counterclockwise to select EXIT.
To cancel an alarm, select OFF at step 6.
2-8
Selected alarm
(flashing)
BTM
Start line
Alarm marker
Bottom alarm (green): right side
ft Fish alarm (white): right side
Bottom-fish alarm (white): left side (vertical screen division)
Setting of alarm zone (ex. Bottom alarm)
Alarm zone setting window (ex. Bottom alarm)
MIN
Level setting window
right side (horizontal screen division)
10 ft
MID MAX