Recognition decks

Recognise any vessel by her lights — night views from every informative aspect, straight from Rules 21–30.

The shape-carrying statuses — balls, cones, cylinders and diamonds from Rules 24–30.

Manoeuvring, warning and restricted-visibility signals — Rules 34–37, patterns rendered as blast notation.

Annex IV, item by item and verbatim — the current text including DSC and EPIRB alerts.

A–Z and 0–9 per the ITU-R M.1677 international Morse alphabet. Runs pattern→character; reversible in the player.

The IALA Maritime Buoyage System — laterals in both regions, preferred channels, cardinals, and the rest of the family. Original teaching content; system facts verified against IALA/NGA/Trinity House guidance.