Furuno LH-3000 - Manual (Page 26)

2. OPERATION
20
Press the [Lower Signal
Select] key to flash
the YELP indicator.
Press the [FUNC] key.
ALL, FWD, AFT and BOTH indicators light.
YELP indicator goes off.
After 5 minutes
ALL, FWD, AFT and BOTH indicators go off.
BOTH indicator lights every four seconds.
STANDBY STATUS
(Alarm mode enabled)
An attempt is made
to remove the
Loud Hailer with
alarm mode active
Alarm sound is released through both horn
speakers at maximum volume.
Silence/cancel alarm
Press any key except AUX or DIM,
or turn off the power.
Enable alarm
Alarm setting/cancel flow