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Meanings of the Maritime Signal Flags.
Letter and Meaning
Flag
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 immediately.
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 your 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.
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