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international code flags | navigation marks | lights and signals | sounds | IALA B buoyage system

Try the "Yachtmaster" test... 5 seconds to recognise each Navigational Aid. Hover or Click for Answers.

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Navigation Lights
Vessel Fishing
Vessel Engaged in Fishing other than Trawling
Navigation Lights
Trawler Over 50M
Trawler Over 50M Making Way
Code Flags
Oscar
"Man overboard." (often attached to the man overboard pole on boats).
Navigation Lights
Restricted Vessel More Than 50M
Restricted in Her Ability to Maneuver
Code Flags
Juliet
"I am on fire and have dangerous cargo on board: keep well clear of me."
Navigation Lights
Vessel Not Under Command
Making way
Sounds and Symbols
1 Prolonged Blast
International - Sound signal for nearing an obscured bend
Code Flags
Papa
In harbour: "All persons should report on board as the vessel is about to proceed to sea".
Code Flags
Sierra
"I am operating astern propulsion."
Navigation Marks
Preferred Channel to Port IALA-B
This mark indicates that the preferred channel is to PORT
Code Flags
Alpha
"I have a diver down; keep well clear at slow speed"
Navigation Marks
Preferred Channel to Starboard IALA – B
This mark indicates that the preferred channel is to STBD
Navigation Marks
Special Mark
Buoys indicate pipelines or areas used for special purposes.
Navigation Marks
Isolated Danger Mark
This type of buoy indicates the position of an isolated danger
Code Flags
Echo
"I am altering my course to starboard."
Navigation Marks
Safe Water Mark
Indicates navigable water all round the mark.
Sounds and Symbols
2 Short Blasts
International - I am altering course to Port
Navigation Lights
Sailing Vessel
Under way with additional masthead lights
Code Flags
Bravo
"I am taking in or discharging or carrying dangerous goods."
Code Flags
Zulu
"I require a tug."
Sounds and Symbols
3 Short Blasts
International - I am operating astern propulsion
Navigation Lights
Trawler
Fishing Trawler Over 50M Making Way
Code Flags
Foxtrot
"I am disabled; communicate with me."
Navigation Lights
Vessel Dredging
Dredger Restricted in Her Ability to Maneuver
Code Flags
Mike
"My vessel is stopped and making no way through the water."[
Code Flags
Hotel
"I have a pilot on board."
Navigation Marks
East Cardinal Mark
Placed in the EAST Quadrant of a Hazard
Navigation Marks
Emergency Wreck Mark
Remains in position until the wreck is published in nautical publications.
Sounds and Symbols
1 Short Blast
International - I am altering course to Starboard
Sounds and Symbols
5 Short Blasts
International/Inland - Danger/Doubt sound signal
Code Flags
Kilo
"I wish to communicate with you."
Code Flags
November
"Negative." (No)
Code Flags
Quebec
"My vessel is 'healthy' and I request free pratique."
Sounds and Symbols
2 Prolonged 1 Short Blast
I intend to overtake you on your starboard side
Navigation Lights
Pilot Vessel
Pilot Vessel at Anchor
Navigation Lights
Power Driven Vessel Towing
Vessel over 50M Towing
Navigation Lights
Sailing Vessel
Under sail from ahead
Navigation Lights
Vessel Constrained by Draught
Vessel Constrained by Draught
Navigation Marks
Starboard Hand Lateral Mark: ‘IALA – B’
Lateral buoys define the borders of channels and indicate the direction.
Sounds and Symbols
1 Prolonged 2 Short Blasts
The signal used by sailing vessels bad visibility.
Code Flags
Victor
"I require assistance."
Navigation Lights
Vessel Aground
Vessel over 50M Aground
Navigation Marks
Port Hand Lateral Mark: ‘IALA – B’
Lateral buoys define the borders of channels and indicate the direction.
Code Flags
Delta
"Keep clear of me; I am maneuvering with difficulty."
Navigation Lights
Fishing Vessel
Fishing Vessel Engaged in Trawling
Navigation Marks
Preferred Channel to Starboard IALA – B
This mark indicates that the preferred channel is to STBD
Code Flags
Tango
"Keep clear of me; I am engaged in pair trawling."
Sounds and Symbols
Vessel At Anchor
Vessel over 7M at Anchor
Code Flags
Romeo
No ICS meaning as single flag.
Navigation Marks
Starboard Hand Lateral Mark: ‘IALA – B’
Lateral buoys define the borders of channels and indicate the direction.
Code Flags
Lima
In harbour: "The ship is quarantined." At sea: "You should stop your vessel instantly."
Navigation Lights
Vessel Towing
From astern
Sounds and Symbols
2 Prolonged 2 Short Blasts
I intend to overtake you on your port side
Navigation Marks
Special Mark
Buoys indicate pipelines or areas used for special purposes.
Code Flags
Yankee
"I am dragging my anchor."
Navigation Marks
Port Hand Lateral Mark: ‘IALA – B’
Lateral buoys define the borders of channels and indicate the direction.
Code Flags
Golf
"I require a pilot."
Navigation Lights
Vessel over 50M Towing
Tow Greater than 200M
Sounds and Symbols
Vessel Under Power
Under power with Sails Set
Code Flags
Charlie
"Affirmative." 'YES'
Navigation Marks
South Cardinal Mark
Placed in the SOUTH Quadrant of a Hazard
Navigation Marks
Safe Water Mark
Indicates navigable water all round the mark.
Code Flags
Whiskey
"I require medical assistance."
Navigation Marks
Preferred Channel to Port IALA-B
This mark indicates that the preferred channel is to PORT
Code Flags
Xray
"Stop carrying out your intentions and watch for my signals."
Navigation Lights
Vessel Over 50M Towing
Restricted in her Ability to Maneuver
Code Flags
Uniform
"You are running into danger."
Navigation Marks
West Cardinal Mark
Placed in the WEST Quadrant of a Hazard
Navigation Lights
Fishing Vessel Engaged in Trawling
Nets fast upon an obstruction
Navigation Lights
Power Driven Vessel
Over 50M long
Navigation Marks
North Cardinal Mark
Placed in the NORTH Quadrant of a Hazard
Code Flags
India
"I am altering my course to port."
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