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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.

Leave Un-Checked for full random cards or Select Checkboxes to see only these categories. Have Fun!..

Navigation Lights
Vessel Fishing
Vessel Engaged in Fishing other than Trawling
Vessel Fishing
Code Flags
Whiskey
"I require medical assistance."
"I require medical assistance."
Sounds and Symbols
2 Short Blasts
International - I am altering course to Port
2 short blasts
Sounds and Symbols
3 Short Blasts
International - I am operating astern propulsion
3 short blasts
Code Flags
Kilo
"I wish to communicate with you."
"I wish to communicate with you."
Code Flags
Romeo
No ICS meaning as single flag.
No ICS meaning as single flag.
Navigation Lights
Vessel Not Under Command
Making way
Vessel Not Under Command
Sounds and Symbols
5 Short Blasts
International/Inland - Danger/Doubt sound signal
get out of the way
Navigation Marks
South Cardinal Mark
Placed in the SOUTH Quadrant of a Hazard
Placed in the SOUTH Quadrant of a Hazard
Navigation Marks
Special Mark
Buoys indicate pipelines or areas used for special purposes.
Buoys indicate pipelines or areas used for special purpos
Navigation Marks
Isolated Danger Mark
This type of buoy indicates the position of an isolated danger
This type of buoy indicates the position of an isolated danger
Code Flags
Juliet
"I am on fire and have dangerous cargo on board: keep well clear of me."
"I am on fire and have dangerous cargo on board: keep well clear of me."
Navigation Lights
Power Driven Vessel Towing
Vessel over 50M Towing
Power Driven Vessel Towing
Code Flags
Sierra
"I am operating astern propulsion."
sierra
Navigation Marks
Emergency Wreck Mark
Remains in position until the wreck is published in nautical publications.
Remains in position until the wreck is published in nautical publications.
Code Flags
India
"I am altering my course to port."
"I am altering my course to port."
Code Flags
Zulu
"I require a tug."
"I require a tug."
Code Flags
Mike
"My vessel is stopped and making no way through the water."[
"My vessel is stopped and making no way through the water."[
Code Flags
Alpha
"I have a diver down; keep well clear at slow speed"
Alpha
Sounds and Symbols
2 Prolonged 1 Short Blast
I intend to overtake you on your starboard side
2long1short
Code Flags
Golf
"I require a pilot."
golf
Navigation Marks
Safe Water Mark
Indicates navigable water all round the mark.
safe water
Navigation Lights
Sailing Vessel
Under way with additional masthead lights
Under sail Port hand aspect
Navigation Marks
Port Hand Lateral Mark: ‘IALA – B’
Lateral buoys define the borders of channels and indicate the direction.
Port Hand Lateral Mark: IALA B
Code Flags
Quebec
"My vessel is 'healthy' and I request free pratique."
"My vessel is 'healthy' and I request free pratique."
Navigation Marks
Preferred Channel to Starboard IALA – B
This mark indicates that the preferred channel is to STBD
Preferred Channel to Starboard
Navigation Lights
Trawler
Fishing Trawler Over 50M Making Way
Trawler
Navigation Marks
Starboard Hand Lateral Mark: ‘IALA – B’
Lateral buoys define the borders of channels and indicate the direction.
Lateral buoys define the borders of channels and indicate the direction.
Navigation Lights
Restricted Vessel More Than 50M
Restricted in Her Ability to Maneuver
Restricted Vessel More Than 50M
Code Flags
November
"Negative." (No)
"Negative." (No)
Navigation Lights
Trawler Over 50M
Trawler Over 50M Making Way
Code Flags
Oscar
"Man overboard." (often attached to the man overboard pole on boats).
"Man overboard." (often attached to the man overboard pole on boats).
Sounds and Symbols
1 Prolonged 2 Short Blasts
The signal used by sailing vessels bad visibility.
fog
Navigation Marks
Preferred Channel to Port IALA-B
This mark indicates that the preferred channel is to PORT
west cardinal
Navigation Marks
Starboard Hand Lateral Mark: ‘IALA – B’
Lateral buoys define the borders of channels and indicate the direction.
Starboard Hand Lateral Mark: 'IALA - B'
Navigation Marks
Preferred Channel to Starboard IALA – B
This mark indicates that the preferred channel is to STBD
This mark indicates that the preferred channel is to STBD
Navigation Lights
Pilot Vessel
Pilot Vessel at Anchor
pilot
Code Flags
Echo
"I am altering my course to starboard."
Echo
Navigation Lights
Vessel Aground
Vessel over 50M Aground
Vessel Aground
Navigation Marks
Safe Water Mark
Indicates navigable water all round the mark.
Indicates navigable water all round the mark.
Navigation Lights
Vessel over 50M Towing
Tow Greater than 200M
Tow Greater than 200M
Navigation Lights
Fishing Vessel Engaged in Trawling
Nets fast upon an obstruction
Fishing Vessel Engaged in Trawling
Code Flags
Hotel
"I have a pilot on board."
"I have a pilot on board."
Navigation Lights
Power Driven Vessel
Over 50M long
Power Driven Vessel
Navigation Lights
Vessel Dredging
Dredger Restricted in Her Ability to Maneuver
Vessel Dredging
Navigation Marks
Port Hand Lateral Mark: ‘IALA – B’
Lateral buoys define the borders of channels and indicate the direction.
Port Hand Lateral Mark: IALA B
Code Flags
Yankee
"I am dragging my anchor."
"I am dragging my anchor."
Code Flags
Tango
"Keep clear of me; I am engaged in pair trawling."
"Keep clear of me; I am engaged in pair trawling."
Navigation Lights
Vessel Constrained by Draught
Vessel Constrained by Draught
Vessel Constrained by Draught
Code Flags
Xray
"Stop carrying out your intentions and watch for my signals."
"Stop carrying out your intentions and watch for my signals."
Code Flags
Victor
"I require assistance."
"I require assistance."
Navigation Lights
Fishing Vessel
Fishing Vessel Engaged in Trawling
Fishing Vessel
Sounds and Symbols
Vessel At Anchor
Vessel over 7M at Anchor
At Anchor
Sounds and Symbols
1 Prolonged Blast
International - Sound signal for nearing an obscured bend
one prolonged blast
Code Flags
Delta
"Keep clear of me; I am maneuvering with difficulty."
"Keep clear of me; I am maneuvering with difficulty."
Sounds and Symbols
2 Prolonged 2 Short Blasts
I intend to overtake you on your port side
2long2short
Code Flags
Lima
In harbour: "The ship is quarantined." At sea: "You should stop your vessel instantly."
lima
Navigation Marks
West Cardinal Mark
Placed in the WEST Quadrant of a Hazard
west cardinal
Navigation Lights
Vessel Towing
From astern
Vessel Towing
Navigation Lights
Sailing Vessel
Under sail from ahead
Sailing vessel under 20 meters long
Navigation Marks
Special Mark
Buoys indicate pipelines or areas used for special purposes.
Buoys indicate pipelines or areas used for special purposes.
Code Flags
Bravo
"I am taking in or discharging or carrying dangerous goods."
Bravo
Code Flags
Charlie
"Affirmative." 'YES'
"Affirmative." 'YES'
Code Flags
Papa
In harbour: "All persons should report on board as the vessel is about to proceed to sea".
Papa
Navigation Marks
North Cardinal Mark
Placed in the NORTH Quadrant of a Hazard
Placed in the NORTH Quadrant of a Hazard
Navigation Marks
East Cardinal Mark
Placed in the EAST Quadrant of a Hazard
East Cardinal
Navigation Lights
Vessel Over 50M Towing
Restricted in her Ability to Maneuver
Vessel Over 50M Towing
Code Flags
Foxtrot
"I am disabled; communicate with me."
Foxtrot
Sounds and Symbols
Vessel Under Power
Under power with Sails Set
under power
Code Flags
Uniform
"You are running into danger."
"You are running into danger."
Sounds and Symbols
1 Short Blast
International - I am altering course to Starboard
one short
Navigation Marks
Preferred Channel to Port IALA-B
This mark indicates that the preferred channel is to PORT
prefered to port
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