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International Marine Signal Flag meanings
 
flag image  Alpha - Diver below (when stationary); I am undergoing a speed trial
flag image  Bravo - I am taking on or discharging explosives
flag image Charlie - (affirmative)
flag image Delta - keep clear of me, I am manoeuvring with difficulty
flag image Echo - I am altering my course to starboard
flag image Foxtrot - I am disabled, communicate with me
flag image Golf - I require a pilot
flag image Hotel - I have a pilot on board
flag image India - I am altering my course to port
flag image Juliet - I am going to send a message by semaphore
flag image Kilo - you should stop your vessel instantly
flag image Lima - you should stop, I have something important to communicate
flag image Mike - I have a doctor on board
flag image November - no (negative)
flag image Oscar - man overboard
flag image Papa - the Blue Peter - all aboard, vessel is about to proceed sea. (At sea) your lights are out or burning badly
flag image Quebec - my vessel is healthy and I request free practique
flag image Romeo - the way is off my ship. You may feel you way past me
flag image Sierra - my engines are going full speed astern
flag image Tango - do not pass ahead of me
flag image Uniform - you are standing into danger
flag image Victor - I require assistance (not distress)
flag image Whisky - I require medical assistance
flag image X Ray - stop carrying out your intentions and watch for my signals
flag image Yankee - I am carrying mails
flag image Zulu - to be used to address or call shore stations
flag image Code and answering pennant.
flag image 0
flag image 1
flag image 2
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flag image 7
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flag image 9
flag image substitute 1
flag image substitute 2
flag image substitute 3
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AC - I am abandoning my vessel.
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AN - I need a doctor.
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BR - I require a helicopter.
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CD - I require immediate assistance.
D - keep clear of me, I am manoevering with difficulty
V - I require assistance (not distress)
DV - I am drifting.
E - I am altering my course to starboard
F - I am disabled, communicate with me
EF - SOS/MAYDAY has been cancelled.
F - I am disabled, communicate with me
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FA - Will you give me my position?
G - I require a pilot
W - I require medical assistance
GW - Man overboard. Please take action to pick him up.
 J - I am going to send a message by semaphore
L - you should stop, I have something important to communicate
JL - You are running the risk of going aground.
L - you should stop, I have something important to communicate
O - man overboard
LO - I am not in my correct position: used by a light vessel.
N - no (negative)
C - (affirmative)
NC - I am in distress and require immediate assistance.
P - the Blue Peter - all aboard, vessel is about to proceed sea. (At sea) your lights are out or burning badly
D - keep clear of me, I am manoevering with difficulty
PD - Your navigation lights are not visible.
P - the Blue Peter - all aboard, vessel is about to proceed sea. (At sea) your lights are out or burning badly
P - the Blue Peter - all aboard, vessel is about to proceed sea. (At sea) your lights are out or burning badly
PP - Keep well clear of me.
Q - my vessel is healthy and I request free practique
D - keep clear of me, I am manoevering with difficulty
QD - I am going ahead.
Q - my vessel is healthy and I request free practique
T - do not pass ahead of me
QT - I am going astern.
Q - my vessel is healthy and I request free practique
Q - my vessel is healthy and I request free practique
QQ - I require health clearance.
Q - my vessel is healthy and I request free practique
U - you are standing into danger
QU - Anchoring is prohibited.
Q - my vessel is healthy and I request free practique
X - stop carrying out your intentions and watch for my signals
QX - I request permission to anchor.
R - the way is off my ship. You may feel you way past me
U - you are standing into danger
RU - Keep clear of me; I am manoeuvring with difficulty.
R - the way is off my ship. You may feel you way past me
Y - I am carrying mails
RY - minimise your wake I am loading or unloading
S - my engines are going full speed astern
O - man overboard
SO - You should stop your vessel instantly.
U - you are standing into danger
M - I have a doctor on board
UM - the Harbour is closed to traffic.
U - you are standing into danger
P - the Blue Peter - all aboard, vessel is about to proceed sea. (At sea) your lights are out or burning badly
UP - Permission to enter Harbour is urgently requested. I have an emergency.
Y - I am carrying mails
U - you are standing into danger
YU - I am going to communicate with your station by means of the International code of signals.
Z - to be used to address or call shore stations
1
ZD1 - Please report me to the Coast Guard, New York
Z - to be used to address or call shore stations
2
ZD2 - Please report me to Lloyds, London.
Z - to be used to address or call shore stations
3
ZL - Your signal has been received but not understood.