Browse every signal flag and navigation light. Tap one to see its meaning, tap the star to favorite.
A — Alpha
Diver down; keep clear
B — Bravo
Dangerous cargo
C — Charlie
Affirmative / Yes
D — Delta
Keep clear; maneuvering
E — Echo
Altering course to starboard
F — Foxtrot
Disabled; communicate
G — Golf
I require a pilot
H — Hotel
Pilot on board
I — India
Altering course to port
J — Juliet
On fire; keep clear
K — Kilo
I wish to communicate
L — Lima
Stop instantly
M — Mike
Vessel stopped
N — November
Negative / No
O — Oscar
Man overboard
P — Papa
About to sail (Blue Peter)
Q — Quebec
Request pratique
R — Romeo
Received
S — Sierra
Engines astern
T — Tango
Keep clear of trawlers
U — Uniform
Heading into danger
V — Victor
Require assistance
W — Whiskey
Require medical assistance
X — X-ray
Stop your intention
Y — Yankee
Dragging anchor
Z — Zulu
I require a tug
Power-driven vessel underway
Masthead + sidelights + sternlight
Vessel at anchor
All-round white (one or two)
Sailing vessel underway
Sidelights + sternlight (no masthead)
Not under command
Two all-round red, vertical
Restricted in ability to maneuver
Red — White — Red, vertical
Vessel constrained by her draft
Three all-round red, vertical
Vessel aground
Anchor light(s) + two all-round red vertical
Fishing (not trawling)
Red over white, all-round
Trawling
Green over white, all-round
Pilot vessel on duty
White over red, all-round
Towing astern (tow ≤ 200 m)
Two masthead vertical + yellow towing light
Towing astern (tow > 200 m)
Three masthead vertical + yellow towing light