Did you know? The navy has a flag alphabet. Each letter or number has a meaning. Flags form a language. Alone or in combination, they indicate a situation.
The best-known are the A, which means "I've got scuba divers", but the Q is also well known because you have to hoist it when you arrive in a new country, to apply for customs clearance...
In today's age of easy communications, flag-making is totally obsolete. But it still retains the charm of traditional sailing. And a little nautical culture never hurts.

A (Alpha)
I've got a scuba diver, so keep your distance and move slowly.

B (Bravo)
I load, unload or transport dangerous goods.

C (Charlie)
Yes (affirmative answer), or the preceding group must be understood as an affirmation

D (Delta)
Don't bother me, I'm maneuvering with difficulty

E (Echo)
I'm coming to starboard

F (Foxtrot)
I'm at a loss, please contact me.

G (Golf)
I need a pilot; From a fishing vessel: "I raise my nets"

H (Hotel)
I've got a pilot on board

I (India)
I'm coming to port

J (Juliet)
I've got a fire on board and I'm transporting dangerous goods, or I've got a leak of dangerous substances.

K (Kilo)
I wish to communicate with you or I invite you to transmit.

L (Lima)
Stop your ship immediately.

M (Mike)
My ship is stopped and has no way to go

N (November)
No (negative response), or the preceding signal must be understood in negative form.

O (Oscar)

P (Dad)
In port: All persons must report on board, as the ship is about to set sail.

Q (Quebec)
My ship is unharmed, I ask for free practice.

R (Romeo)
Procedure signal

S (Sierra)
I beat back.

T (Tango)
Don't mind me, I'm a twin trawler.

U (Uniform)
You're running into danger

V (Victor)
I need assistance

W (Whiskey)
Request for medical assistance

X (X-ray)
Stop your maneuvers and watch for my signals

Y (Yankee)
My hunting anchor

Z (Zulu)
I need a tugboat. "By a fishing vessel": I put my nets in the water.

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Overview

1st substitute

2nd substitute

3rd substitute
