COLREG 72: Rules of the Road

COLREG 72 is a complete study and reference app for the International Regulations for Preventing Collisions at Sea (IRPCS), the Rules of the Road. Learn navigation lights, day shapes and sound signals, then test yourself with quizzes. Built for maritime students, merchant navy officers, yacht skippers, and anyone preparing for an RYA Day Skipper, Yachtmaster, MCA or international maritime examination.

WHAT IS INCLUDED

- Flashcard System — Card-based learning tied directly to each COLREG 72 rule. Study at your own pace and track which rules you've mastered.

- Interactive Quizzes — Multiple-choice questions with instant feedback. Answer statistics and progress tracking help you focus on weak areas.

- Light Placement Quizzes — Put the navigation lights on the vessel silhouette yourself: masthead, side and stern lights, special signals. 74 hands-on questions across Rules 23–30 with hints and a light-by-light review. The fastest way to remember the nav lights of power-driven vessels, sailing vessels, tugs, trawlers, pilot vessels and ships at anchor.

- Theory with Explanations — Full COLREG 72 theory content in clear sections. Detailed explanations make complex navigation rules easy to understand.

- Sound Signals — Audio playback for all mandatory sound signals. Learn to recognise horn sequences by ear, not just by text.

- Cross-Rule References — Links between rules and theory open in pop-up overlays so you never lose your place.

- Tablet & Phone Support — Optimised for all Android devices.

- Report an Error — send a correction straight from a question card.

- Multi-Language — Available in English, German, Russian, Spanish and French.

WHO IS THIS FOR

- Maritime students at nautical colleges and academies
- Merchant navy officers preparing for OOW, Chief Mate, or Master examinations
- Yacht skippers and RYA Day Skipper / Yachtmaster candidates
- Coastal and offshore sailors who need a reliable collision avoidance reference
- Anyone sitting an MCA, MNI, or international maritime authority examination

FREE & PRO

The free version includes core flashcards and quizzes supported by ads. Upgrade to Pro to remove all ads and unlock the complete theory library, full quiz bank, and sound signals content.

Download COLREG 72 and arrive at your examination prepared.

COLREG 72 is an independent study app and does not represent any government entity. It is not affiliated with or endorsed by the IMO, the U.S. Coast Guard or any maritime authority. Some practice questions are reproduced from public sample examinations; none are the questions used in an actual examination.
Official source: COLREGs 1972 (IMO): https://www.imo.org/en/About/Conventions/Pages/COLREG.aspx

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