GUIDE-TO-SOUND-SIGNALS

MANOEUVRING & WARNING
SOUND SIGNALS
SHORT BLAST - 1 SECOND
PROLONGED BLAST - 4 TO 6 SECONDS
"I am altering my
course to
starboard"
ONE SHORT
BLAST
"I am altering my
course to port"
TWO SHORT
BLASTS
"I am operating
astern
propulsion"
THREE SHORT BLASTS
?!
"I fail to
understand your
intentions"
FIVE SHORT BLASTS
"I intend to
overtake you on
your starboard
side"
LONG LONG SHORT
"I intend to
overtake you on
your port side"
LONG LONG SHORT SHORT
"I agree with your
intention to
overtake me"
LONG SHORT LONG SHORT
When nearing a
bend where
vessels may be
obscured
ONE LONG BLAST
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SOUND SIGNALS IN
RESTRICTED VISIBILITY
IN OR NEAR AN AREA OF RESTRICTED VISIBILITY
WHETHER BY DAY OR NIGHT
A power driven
vessel making
way
A power driven
vessel underway
but stopped
ONE LONG BLAST
TWO LONG BLASTS
Not Under Command
Restricted in Ability
Constrained by Draft
Fishing
Sailing
Towing
ONE LONG AND TWO SHORT BLASTS
Vessel at anchor
Last vessel in a manned tow
BELL FOR 5
SECONDS
EVERY
MINUTE
PLUS GONG
IF OVER
100M
ONE LONG AND THREE
SHORT
Vessel aground
Plus a gong if
over 100m
Pilot vessel on duty
THREE STROKES OF THE
BELL EITHER SIDE OF
ANCHOR BELL
FOUR SHORT BLASTS
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