A I have a diver down; keep well clear at slow speed.
B* I am taking in, or discharging, or carrying dangerous goods.
C Yes (affirmative or the significance of the previous group should be read in the affirmative).
D* Keep clear of me; I am maneuvering with difficulty.
E* I am altering my course to starboard.
F I am disabled; communicate with me.
G I require a pilot. When made by fishing vessels operating in close proximity on the fishing grounds it means: I am hauling nets.
H* I have a pilot on board.
I* I am altering my course to port.
J I am on fire and have dangerous cargo on board: keep well clear of me.
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 (negative or the significance of the previous group should be read in the negative). This signal may be given only visually or by sound. For voice or radio transmission the signal should be NO.
O Man overboard.
P In harbor. - All persons should report on board as the vessel is about to proceed to sea. At sea. -It may be used by fishing vessels to mean: My nets have come fast upon an obstruction.
Q My vessel is healthy and I request free pratique.
S* My engines are going astern.
T* Keep clear of me; I am engaged in pair trawling.
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. When made by fishing vessels operating in close proximity on the fishing grounds it means: I am shooting nets.

notes:

1. Signals of letters marked by on asterisk (*) when made by sound may only be made in compliance with the requirements of the International Regulations for Preventing Collisions at Sea, Rules 15 and 28.


2. Signals K and S have special meanings as landing signals for small boats and crews or persons in distress. (International Convention for the Safety of Life at Sea, 1960, Chapter V, Regulation 16.)

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