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 manoevering 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.

Updated 1997-07-22 by Lars Bruzelius