Maritime Signal Flags
Halyard
A polished offline signal-flag studio for composing flag hoists, reading International Code of Signals references, practicing semaphore, and reviewing Morse and phonetic alphabets.
What Halyard Does
- Compose words and short messages as International Code of Signals flag hoists.
- Decode a hoist by tapping flags back into letters.
- Browse alphabet flags, numeral pennants, substitute pennants, and code signals.
- Study two-flag semaphore positions with clear offline artwork.
- Practice recognition through a scoring quiz with streaks.
- Reference Morse and the NATO/ICAO phonetic alphabet, with source citations in the app.
Privacy
Halyard does not require an account, does not include analytics or advertising SDKs, and does not collect personal data. App settings stay on the device.