Room · wave 2

Signal

How ships talk without a shared language: flags that each carry a whole sentence, Morse by lamp, radio and whistle, and spelling words that survive a bad line. Everything here follows the current International Code of Signals and the ITU and IMO rules, with older practice noted where it differs.

Code flags

26 letter flags, 10 numeral pennants, substitutes; every single-flag meaning.

Flag hoist

Type a word and see it hoisted, with substitutes where letters repeat.

Morse code

Hear it at any speed, see the timing, and train your ear.

Phonetic alphabet

Alfa to Zulu and the figure code words, and the alphabet they replaced.

Sound signals

Whistle signals for manoeuvring and in fog, played at their real length.