Furuno 9ZWFM4850 Operator's Manual page 55

Fog Horn/Hailer/Intercom
Sound warning signals
Warning
Signal
For ship passing.
Manual
For emergency
siren.
Yelp
For power-driven
vessels
underway.
Underway
For power-driven
vessel that is
stationary.
Stopped
For sailboats, tug
boats and tow
Sailboat boats underway.
Function
The lengths and timing of the horn blasts are
controlled by pressing and holding the PTT
key on the handset.
One 5-second blast at 120-second interval.
Two 3-second blasts, with a 2 - second interval
between each blast, repeated every 120
seconds.
One 3-secondblast, followed by one 2-second
interval, one 1-second blast, one 2-
secondinterval and one 1-second blast.
Repeated every 120 seconds.
FM-4850 Operator's Manual
Remarks
5s
Underway Signal
3s 2s 3s
46
120s
120s
Stopped Signal