Code of Signals

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About this app

Not a government app. Code of Signals is an independent app by SusaSoftX. It does not represent the U.S. Government, the National Geospatial-Intelligence Agency, the U.S. Coast Guard or the International Maritime Organization, and it is not affiliated with or endorsed by them.

Source: the signals come from this U.S. Government publication, and no other sources are used for them:
• Pub. 102, International Code of Signals, United States edition (1969, revised 2003). Official copy from the U.S. Coast Guard: https://www.dco.uscg.mil/Portals/9/NMC/pdfs/examinations/01_international_code_of_signals_pub_102_2005_ed.pdf
It is a U.S. Government work in the public domain. Semaphore is not part of Pub. 102; the app uses the usual international semaphore alphabet.

Code of Signals puts the International Code of Signals for sailors on your phone. Everything is stored in the app, so it works without a connection: at sea, in class or wherever you lose signal.

What's inside
• All 40 signal flags and pennants: the alphabet flags, numeral pennants, substitutes and the answering pennant, with their meanings
• The single-letter signals, such as O "Man overboard" and V "I require assistance"
• The General Signal Code: over 1,400 two-letter signals by subject, with their complements, searchable by code or by words ("fire", "tug", "NC")
• Every signal as a flag hoist, spoken in the phonetic alphabet, and in Morse with sound and a signal lamp
• Spell It: any message as flag hoists (with substitutes for repeated flags), Morse, semaphore or the phonetic alphabet
• Morse code: send your own message with sound and light, from 1 to 30 words a minute
• Semaphore: the hand flag alphabet
• The phonetic alphabet, procedure signals, and distress and lifesaving signals

For learning and reference. On board, follow the current official edition and the rules of your flag state.

The app shows a small banner ad. Privacy policy: https://susasoftx.github.io/privacy-policy.html
Signal flags, 1,400 two-letter signals, Morse and semaphore, all offline.
Updated on
Nov 11, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Location, App activity and 2 others
  • This app may collect these data types
    Location, App activity and 2 others
  • Data is encrypted in transit
  • Data can’t be deleted

What’s new

First release: the International Code of Signals (Pub. 102) with its 40 flags and pennants, 1,400 two-letter signals, Morse and semaphore, for use offline.