The Maritime Signal Flags Masterclass: Deciphering Nautical Semaphores & Emergency Pennants

📖 International Code of Signals (ICS) Deck

Tap any flag to inspect its tactical naval meaning, single-letter emergency directive, Morse code equivalent, and phonetic callsign.

ALPHA

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Tactical Meaning

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

Flag Geometry & Hues

White & Blue swallowtail burgee, split vertically.

Operational Context

Mandatory worldwide. Approaching vessels must drop to idle throttle and post bow lookouts.

⚓ The Naval Yardarm & Halyard Rig

Signals are read from top to bottom. Flags hoisted together on a single halyard line express a distinct compound naval message. Hoist up to 4 pennants to simulate sea-trial visibility.

HOIST IS CLEAR

Active Hoist String (Top to Bottom)

Click flags below to add them to the mast halyard string.

Quick-Add Codebook Flags

Preset Historic Naval Hoists

🚨 Tactical Emergency Dispatch Decoder

Naval surveillance outposts have intercepted emergency flag hoists flown by distressed merchant vessels. Translate the visual signals to unlock the tactical rescue coordinates!

Intercept #1: North Atlantic Gale Warning

PRIORITY HIGH

A listing freighter has lost engine power in heavy seas off Cape Farewell. Lookouts on the cutter observe three flags flapping furiously from the starboard yardarm. Decipher each letter:

📜 Admiralty Bunting Dispatcher & Certified Warrant

Compose any tactical message, callsign, or naval vessel name to generate high-resolution naval flag bunting, sound the departure whistle, and print your Admiralty Signal Officer Warrant.

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Imperial Admiralty Navigation Board

Certificate of Competency in International Flag Semaphores

This is to certify that the bearer has completed all theoretical and tactical examinations in visual maritime telecommunications under the International Code of Signals (ICS). Having successfully decoded emergency vessel signals, rigged halyard yardarms, and encoded naval fleet dispatches, the bearer is hereby designated:

LIEUTENANT SIGNAL OFFICER OF THE WATCH

Current Dispatch Registered: "FULL SPEED AHEAD"

ISSUED: 2026-10-21
REGISTRY: ADM-7749-ICS-NAV
STATUS: SEALED & VERIFIED

ICS VERIFIED