🚢 International Signal Flags

A – Alfa

Diver down – keep clear

White & Blue swallowtail

B – Bravo

Dangerous cargo

Solid Red swallowtail

C – Charlie

Yes / Affirmative

Blue / White / Red / White / Blue horizontal stripes

D – Delta

Keep clear – manouvering

Yellow–Blue–Yellow horizontal bands

E – Echo

Altering course to starboard

Blue over Red horizontal halves

F – Foxtrot

Disabled – communicate

White with Red diamond centre

G – Golf

I require a pilot

Yellow & Blue vertical stripes (6)

H – Hotel

Pilot on board

White & Red vertical halves

I – India

Altering course to port

Yellow with Black circle

J – Juliett

On fire – keep clear

Blue / White / Blue horizontal stripes

K – Kilo

I wish to communicate

Yellow & Blue vertical halves

L – Lima

Stop instantly

Diagonal checkerboard — Yellow & Black

M – Mike

My vessel is stopped

White diagonal cross on Royal Blue

N – November

No / Negative

Blue & White checkerboard (4×4)

O – Oscar

Man overboard

Red & Yellow diagonal (red top-right, yellow bottom-left)

P – Papa

All aboard – departing

Blue with White rectangle centre

Q – Quebec

My vessel is healthy and I request free pratique

Solid Yellow

R – Romeo

Used in combination

Red with Yellow cross

S – Sierra

Engine going astern

White with Blue square centre

T – Tango

Naval: Do not pass ahead of me. Merchant/ICS: Keep clear of me; I am engaged in pair trawling.

Red / White / Blue vertical stripes

U – Uniform

You are running into danger

Red & White 2×2 diagonal checkerboard

V – Victor

I require assistance

White with Red diagonal X

W – Whiskey

I require medical assistance

Blue frame, White inner frame, Red centre

X – X-ray

Stop your intentions, watch for my signals

White with Blue cross

Y – Yankee

Dragging anchor

5 red & 5 yellow diagonal stripes

Z – Zulu

I require a tug

Yellow / Blue / Red / Black quartered diagonally