1. Grunt Productions 2008
Sound Signal Devices
A Brief By Lance Grindley

2. Grunt Productions 2008
Sound Signal Devices
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Vessels 12 meters or moreVessels 12 meters or more
shall carry a whistleshall carry a whistle andand aa
bell.bell.

3. Grunt Productions 2008
Sound Signal Devices
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Vessels 100 meters or moreVessels 100 meters or more
shall carry a whistle, a bellshall carry a whistle, a bell
andand a gong.a gong.
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4. Grunt Productions 2008
Sound Signal Devices
MASTERMASTER
BLASTERBLASTER
!Vessels less than 12 metersVessels less than 12 meters
shall carry a “means of makingshall carry a “means of making
an efficient sound signal.”an efficient sound signal.”

5. Grunt Productions 2008
Maneuvering and Warning Signals
Alter to Starboard –Alter to Starboard –
1 short blasts1 short blasts

6. Grunt Productions 2008
Maneuvering and Warning Signals
Alter to Port –Alter to Port – 2 short blasts2 short blasts

7. Grunt Productions 2008
Maneuvering and Warning Signals
Operating astern propulsion -Operating astern propulsion -
3 short blasts3 short blasts

8. Grunt Productions 2008
Maneuvering and Warning Signals
Overtaking in a narrow channel or fairwayOvertaking in a narrow channel or fairway
Vessel to beVessel to be
OvertakenOvertaken
OvertakingOvertaking
VesselVessel

9. Grunt Productions 2008
Danger signal- at least 5 short and rapid blasts if:Danger signal- at least 5 short and rapid blasts if:
# not in agreement with proposed maneuvernot in agreement with proposed maneuver
# fail to understand intentions of other vesselfail to understand intentions of other vessel
# in doubt if sufficient action is being takenin doubt if sufficient action is being taken
Maneuvering and Warning Signals

10. Grunt Productions 2008
STACKSSTACKS
TREESTREES
BLDGS.
Nearing a bend or area where otherNearing a bend or area where other
vessels may be obscured by anvessels may be obscured by an
obstruction - 1 prolonged blastobstruction - 1 prolonged blast
Maneuvering and Warning Signals

11. Grunt Productions 2008
Power-driven vessel making way -Power-driven vessel making way - 1 prolonged blast1 prolonged blast
Power-driven vessel underway but stopped and notPower-driven vessel underway but stopped and not
making way (drifting) -making way (drifting) - 2 prolonged blasts2 prolonged blasts
Signals in Restricted Visibility
At least every 2 minutesAt least every 2 minutes
At least every 2 minutesAt least every 2 minutes

12. Grunt Productions 2008
Signals in Restricted Visibility
Any of the following vessels –Any of the following vessels –
1 prolonged & 2 short blasts1 prolonged & 2 short blasts::
 not under commandnot under command
 restricted in ability to maneuverrestricted in ability to maneuver
 engaged in fishingengaged in fishing
 towing or pushing anothertowing or pushing another
 sailing vesselsailing vessel
At least every 2 minutesAt least every 2 minutes

13. Grunt Productions 2008
Signals in Restricted Visibility
At least every 2 minutesAt least every 2 minutes
A vessel towing or pushing -A vessel towing or pushing - 1 prolonged & 2 short1 prolonged & 2 short
A vessel being towed -A vessel being towed - 1 prolonged & 3 short1 prolonged & 3 short

14. Grunt Productions 2008
A vessel at anchor:A vessel at anchor:
ring a bell for 5 seconds at least every 1 minutering a bell for 5 seconds at least every 1 minute
may also sound 1 short, 1 prolonged, 1 short blastsmay also sound 1 short, 1 prolonged, 1 short blasts
Does not apply to vessels less than 12 meters anchored in aDoes not apply to vessels less than 12 meters anchored in a
designated anchoragedesignated anchorage
Signals in Restricted Visibility

15. Grunt Productions 2008
1
Signals in Restricted Visibility
Anchor Fog Signals for vessel
100mtrs or more in length
2

16. Grunt Productions 2008
A vessel aground:A vessel aground: Less than 100 mtrs.Less than 100 mtrs.
Signals in Restricted Visibility

17. Grunt Productions 2008
Aground Fog Signals for vessel
100mtrs or more in length
1
2
Signals in Restricted Visibility

18. Grunt Productions 2008
Pilot vessel making way -Pilot vessel making way - 1 prolonged blast + 4 short blasts1 prolonged blast + 4 short blasts
Pilot vessel underway but stopped and not making wayPilot vessel underway but stopped and not making way
(drifting) -(drifting) - 2 prolonged blasts + 4 short blasts2 prolonged blasts + 4 short blasts
Signals in Restricted Visibility
At least every 2 minutesAt least every 2 minutes
At least every 2 minutesAt least every 2 minutes

19. Grunt Productions 2008
Signals in Restricted Visibility
A vessel less than 12 meters is not obliged toA vessel less than 12 meters is not obliged to
give these restricted visibility signals butgive these restricted visibility signals but
shall make some other efficient sound signalshall make some other efficient sound signal
at least every 2 minutes.at least every 2 minutes.