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Flags - Signal Code Message Definitions

Signal flags are used at sea for communication between ships. Individual flags and combinations of flags can spell short messages, and some of them have special meanings as well.

Signal Code Flag Definitions - PDF

Shop for Signal Code Flags

Signal Flag Definitions
Letter/Number Signal Flags Signal Flag Meanings Yacht / Dinghy Racing Signal Meanings
A A Signal Code Flag Diver below (when stationary); I am undergoing a speed trial
B B Signnal Code Flag I am taking on or discharging explosives Protest
C C Signal Code Flag Yes (affirmative) Position of next mark has been changed
D D Signal Code Flag Keep clear of me, I am manoevering with difficulty Don't launch/follow this rib
E E Signal Code Flag I am altering my course to starboard
F F Signal Code Flag I am disabled, communicate with me
G G Signal Code Flag I require a pilot
H H signal Code Flag I have a pilot on board
I I Signal Code Flag I am altering my course to port Round the ends
J J Signal Code Flag I am going to send a message by semaphore
K K Signal Code Flag You should stop your vessel instantly
L L Signal Code Flag You should stop, I have something important to communicate Change to SIs or other amendment
M M Signal Code Flag I have a doctor on board There is a mark missing
N N Signal Code Flag No (negative) Abandon
O O Signal Code Flag Man overboard Rule 42 is waived
P P Signal Code Flag The Blue Peter - all aboard, vessel is about to proceed sea. (At sea) your lights are out or burning badly Preparatory
Q Q Signal Code Flag My vessel is healthy and I request free practique
R R Signal Code Flag The way is off my ship. You may feel you way past me Rule 42 is restored
S S Signal Code Flag My engines are going full speed astern shortened course
T T Signal Code Flag Do not pass ahead of me
U U Signal Code Flag You are standing into danger One step less stringent than a black flag, allows boats back in after a general recall or abandonment
V V Signal Code Flag I require assistance (not distress)
W W signal Code Flag I require medical assistance
X X Signal Code Flag Stop carrying out your intentions and watch for my signals Individual recall
Y Y Signal Code Flag I am carrying mail Lifejackets must be worn
Z Z Signal Code Flag To be used to address or call shore stations 20% scoring penalty
1st Substitute 1st Subsititute
2nd Substitute Flag 2nd Subsititute
3rd Substitute Flag 3rd Subsititute
Answer Flag Answer Postponement
0 0-Zero-Signal Code-Flag
1 1-Signal-Code-Flag
2 2-Signal-Code-Flag
3 3-Signal-Code-Flag
4 4-Signal-Code-Flag
5 5-Signal-Code-Flag
6 6 Signal Code Flag
7 7 Signal Code Flag
8 8 Signal Code Flag
9 9 Signal Code Flag