⚓ COLREGs / ROR

A rule-by-rule learning library and oral-exam practice.

Rule Library

Nautical Flags

Browse international signal flags, numeral pennants, substitutes and practical examples without leaving COLREGs.

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Oral examination practice

Choose a session length and practise one question at a time.

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Study disclaimer: For study only. Always consult the official COLREGs, current amendments and applicable guidance; follow the Rules and the Master’s standing orders in practice.

International Organization for Marine Aids to Navigation

Interactive IALA buoy simulator and reference guide.

IALA Buoys by Type

Pick a buoy type. The ship sails past it, the lights flash in their real rhythm, and the text explains each move.

Lights & Shapes

Interactive demonstrations for COLREGs Rules 20–31. Explore vessel lights, day shapes, visibility arcs and sound signals.

ROR Cards

Practise vessel lights, day shapes and sound signals with flashcards and quizzes. Your existing card access limits and account practice history remain in place.

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Weak-topic review

Practice results are saved in this browser only. Use this section to revisit rules missed in questions.