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 maneuvering 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.

Numeric Pennants

0

1

2

3

4

5

6

7

8

9

Substitute Pennants

substitute 1;

substitute 2;

substitute 3;

Distress

N + C - I am in distress