Furuno LH-3000CG Operator's Manual page 27

Disabling the alarm mode
Press any key or switch other than the [AUX] or [DIM] key, or turn off the power.
Enable alarm
Press the [Lower Signal
Select] key to flash
the YELP indicator.
Press the [FUNC] key.
An attempt is made
to remove the
Loud Hailer with
alarm mode active
ALL, FWD, AFT and BOTH indicators light.
YELP indicator goes off.
ALL, FWD, AFT and BOTH indicators go off.
BOTH indicator lights every four seconds.
Alarm sound is released through both horn
speakers at maximum volume.
Press any key except AUX or DIM,
or turn off the power.
Alarm setting/cancel flow
After 5 minutes
STANDBY STATUS
(Alarm mode enabled)
Silence/cancel alarm
2. OPERATION
19