Flag alphabet and meaning page 1.

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A
Alfa

“I have a diver down; keep well clear at slow speed.”

B
Bravo

“I am taking in or discharging or carrying dangerous goods.” (Originally used by the Royal Navy specifically for military explosives.)

C
Charlie

“Affirmative.”

D
Delta

“Keep clear of me; I am maneuvering 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.”
By fishing vessels near fishing grounds: “I am hauling nets.”

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 leaking dangerous cargo.”


K
Kilo


“I wish to communicate with you.”

L
Lima


In harbour: “The ship is quarantined.”
At sea: “You should stop your vessel instantly.”


M
Mike


“My vessel is stopped and making no way through the water.”



https://en.wikipedia.org/wiki/International_maritime_signal_flags