Sit a full timed mock exam without leaving the app, review every mistake with comments, and study on iPad with a refreshed tablet layout.
COLREG 72 is a complete study and reference app for the International Regulations for Preventing Collisions at Sea (COLREGs). Designed for maritime students, merchant navy officers, yacht skippers, and anyone preparing for an MCA, RYA, or international maritime examination.
WHAT IS INCLUDED
- Full text of all 72 COLREG rules (Annexes I through IV)
- Theory study with illustrations
- Navigation lights identification quizzes
- Rule-based tests with answer explanations
- Exam mode — a timed mock examination across all the rules with a final score and a full mistake review
- Cross-references between rules and theory — open in popup overlays so you never lose your place
HOW IT WORKS
Theory and rules are linked throughout the app. When you answer a quiz question incorrectly or open a hint, a direct link appears to the exact theory section that covers the topic. Review the rule, then return to the quiz.
The app tracks which theory sections you have read, so you always know where you left off and what still needs attention.
EXAM MODE
Simulate the real examination. The exam is timed and draws questions from across all the rules. When time runs out, you get a clean result screen with your score and every mistake listed. Tap a wrong answer to see the explanation, the original comment from the question card, and a direct link to the relevant rule — so every attempt teaches you something.
READING
Reading is fully customisable: choose from multiple font types, adjust the font size, and switch between three colour themes — light, sepia, and dark — for comfortable study in any lighting condition. Layouts are tuned for both iPhone and iPad.
WHO IT IS 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
WHY COLREG 72
International collision avoidance regulations are the foundation of safe navigation at sea. Whether you are studying for the first time or refreshing your knowledge before an examination, this app gives you the full text, visual aids, practice tests, and a realistic exam mode to build true confidence.
One-time purchase. No subscription. No ads. Study offline, anytime.
Download COLREG 72 and arrive at your examination prepared.
Just a series of quizzes.It’s be good to teach first or explain the basics of each section before the quiz.Sounds also don’t work in the sound module.
Developer Response
Thank you for your feedback — we really appreciate it.In the latest version, we’ve significantly improved how quizzes are integrated with theory, making it easier to learn the basics alongside practice. We’ve also noted your comment about the sound module and will look into it.
Answers to questions wrong
MidTaylor
Rule 23, question 12, vessels under 12m lights. The answer on the app indicated that the aspect was ahead, however the sidelights were the wrong way around in the image for this to be true.
Developer Response
Thank you for your feedback.We’ve carefully reviewed Rule 23, question 12, and can confirm that the answer and light configuration shown in the app are correct and consistent with the COLREGs.That said, we appreciate you taking the time to raise this — if anything still seems unclear, feel free to reach out.
Too Many Mistakes
Joe.MM
App as potential but there are far too many mistakes with the layout of the lights and the answers given. Don’t rely on this app to learn your rule of the road.
Developer Response
Thank you for your feedback. We take accuracy very seriously, as all content is based on the official COLREGs.If you’ve come across specific issues, please let us know — we’ll review them promptly and make corrections if needed.
Smart Study Reminders
Turn on optional reminders and Vessel Lights will bring you back only when there is something useful to practise: an unfinished exam, personal practice, or mistakes to review.
Respectful Timing
Reminders use quiet hours and weekly caps, so notifications stay focused and easy to control.
Reliability Fixes
Improved background sync for reminder profiles and fixed a rare secure-storage crash during start-up.
Version 2.7.0
The developer, Smirnov Yury, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
