International Code Signal Flags
Single-letter meanings
A I
have a diver down. Keep well clear at low speed.
B I am taking in or discharging or carrying dangerous
goods.
C Yes.
D Keep clear of me. I am manoeuvring with difficulty.
E I am altering course to starboard.
F I am disabled. Communicate with me.
G I require a pilot.
H I have a pilot on board.
I I am altering course to port.
J I am on fire and have dangerous cargo on board. Keep well
clear.
K I wish to communicate with you.
L You should stop your vessel instantly.
M My vessel is stopped and making no way through the water.
N No.
O Man overboard.
P (In harbour) All persons should report on board as the
vessel is about to depart. (At sea) My nets are fast on an obstruction.
Q My vessel is healthy and I request free pratique.
R No meaning.
S My engines are going astern.
T I am pair trawling. Keep clear.
U You are running into danger.
V I require assistance.
W I require medical assistance.
X Stop carrying out your intentions and watch for my
signals.
Y I am dragging my anchor.
Z I require a tug. (By fishing boats) I am shooting nets.
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Meanings of International Maritime Signal Flags
A - Diver below (when stationary); I am undergoing a speed trial
B - I am taking on or discharging explosives
C - (affirmative)
D - keep clear of me, I am manoeuvring with difficulty
E - I am altering my course to starboard
F - I am disabled, communicate with me
G - I require a pilot
H - I have a pilot on board
I - I am altering my course to port
J - I am going to send a message by semaphore
K - you should stop your vessel instantly
L - you should stop, I have something important to communicate
M - I have a doctor on board
N - no (negative)
O - man overboard
P - the Blue Peter - all aboard, vessel is about to proceed sea. (At sea)
your lights are out or burning badly
Q - my vessel is healthy and I request free practique
R - the way is off my ship. You may feel you way past me
S - my engines are going full speed astern
T - do not pass ahead of me
U - you are standing into danger
V - I require assistance (not distress)
W - I require medical assistance
X - stop carrying out your intentions and watch for my signals
Y - I am carrying mails
Z - to be used to address or call shore stations
Answering Pennant
Code and answering pennant.
Numeric Pennants
0
1
2
3
4
5
6
7
8
9
Substitute Pennants
substitute 1;
substitute 2;
substitute 3;
Distress
N + C - I am in distress
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Code and answering pennant.
0
substitute 1;
