Signalling

One flag signals

International Code 1934 revision.

A	Undergoing speed trials.
B	I am taking in or unloading explosives.
C	Yes (affirmative)
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 onboard
I	I am altering 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	At sea: Your lights are out. In harbour: Vessel about to sail.
Q	My vessel is healthy. I request free pratique.
R	The way is off my ship.
S	Engines are going astern.
T	Do not pass ahead of me.
U	You are standing into danger.
V	I require assistance.
W	I require medical assistance.
X	Stop carrying out your intention and watch my signal.
Y	I am carrying mail.
Z	Used to address or call shore signal stations.

Transcribed by Lars Bruzelius