Nautical Signal Flags

Signal flags, as a part of the International Code of Signals can be used to communicate messages from one vessel to another while at sea. Signal flags, which have alpha-numeric correspondence, can be used to spell out messages; although mariners usually employ nautical signal flags in combinations which correspond to particular messages. Mariners string signal flags end-to-end and hang them from the rigging in bow-to-stern direction. Signal flags are also used to dress ships for ceremonial and festive occasions.

The History of Nautical Signal Flags

The International Code of Signals has been in continuous use since 1857, when it was published by the British Board of Trade as a means of maritime communications. The original Code contained 17,000 signals using 18 signal flags, some of which were specific to the United Kingdom . The Code was revised in 1932 to include seven languages: English, French German, Italian, Japanese, Spanish and Norwegian. When the code was revised again in 1969, the revision included Russian and Greek, plus giving a complete meaning to each of the alpha-numeric nautical signal flags

Meanings of Nautical Signal Flags

Besides having alpha-numeric correspondence, signal flags also have specific meanings when flown upon a vessel. The International Code of Signals specifies a meaning for each of the signal flags. We have listed below each of the signal flags, the letters and messages to which they correspond.
All these flags have different meanings when used for sailing races

A (Alfa) - Diver Below (when stationary) or "I am undergoing a speed trial."

B (Bravo) - "I am taking on, or discharging explosives."

C (Charlie) - "Affirmative"

D (Delta) - "Keep clear of me, I am manouvering with difficulty."

E (Echo) - "I am altering my course to starboard."

F (Foxtrot) - "I am disabled, communicate with me."

G (Golf) - "I require a pilot."

H (Hotel) -"I have a pilot on board."

I ( India ) - "I am altering my course to port."

J (Juliet) - "I am on fire and have dangerous cargo on board, keep well clear of me! OR "I am going to send a message by semaphore."

K (Kilo) - "You should stop. I have something important to communicate."

L ( Lima ) -"You should stop your vessel instantly."

M (Mike) - "I am stopped." OR "I have a doctor on board."

N (November) - No, "negative"

O (Oscar) - Man overboard

P (Papa) - The Blue Peter: "All aboard, vessel is about to proceed sea." If already at sea - "Your lights are out or burning badly." Fishing boat at sea - "My nets have come fast upon an obstruction."

Q ( Quebec ) - "My vessel is healthy and I request free practique."

R (Romeo) - "The way is off my ship. You may feel your way past me."

V (Victor) - "I require assistance." (not distress)

W (Whiskey) - "I require medical assistance."

X (X-Ray) - "Stop carrying out your intentions and watch for my signals."

Y (Yankee) - "I am dragging anchor." OR "I am carrying mails."

Z (Zulu) - "I require a tug." or can be used to address or call shore stations

Code & Answering Flag

First substitute flag

Second substitute flag

Third substitute flag

1

2

3

4

5

6

7

8

9

0