International Code of Signal Flags

Here each flag is matched with its letter value and the corresponding single-letter signal. The letter flags and number pennants are also used in combinations of 2 or more to communicate hundreds more messages. This information is adapted from the 1999 International Code of Signals, Pub. 102 from the National Imagery and Mapping Agency, which contains the entire code. You may also want to look into barcode symbols and barcode labels.

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, or I am leaking dangerous cargo.

K

I wish to communicate with you.

L

You should stop your vehicle instantly.

M

My vessel is stopped and making no way in the water.

N

No (Negative, or The significance of the previous group should be read in the negative.)

O
I am altering my course to starboard.

P
In harbor: All persons should report on board as the vessel is about to proceed to sea.
At sea: It may be used on fishing vessels to mean My nets have come fast upon an obstruction.

Q

My vessel is "healthy" and I request free pratique.

R

The way is off my ship; you may feel your way past me.

Without explanation, no single-letter signal value for this flag was given in the International Code of Signals.
This is taken from the Watch Officers Guide.

S

I am operating astern propulsion.

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 in close proximity on the fishing grounds it means I am shooting nets.

Å

 

Æ

 

Œ

0

 

1

2

3

4

 

5

6

 

7

8

 

9

1st Substitute   2nd Substitute
  3rd Substitute   4th Substitute
  CODE
Answering Pennant
or Decimal Point
  CHIFFER
Scandinavian Code Flag
  DIVER

Advisory
ADVISORY

Storm
STORM
   

For more information on these flags, visit the National Weather Service or the Coast Guard.

NATO NUMBERS

 

0

 

1

 

2

 

3

 

4

 

5

 

6

 

7

 

8

 

9


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