COLREG 72 is a complete study and reference app for the International Regulations for Preventing Collisions at Sea (COLREGs). Built for maritime students, merchant navy officers, yacht captains, and anyone preparing for a maritime exam.
WHAT IS INCLUDED
- Full text of all 72 COLREG rules (Annexes I through IV)
- Theory study with illustrations
- Navigation lights identification quizzes
- Light placement quizzes — put the lights on the vessel silhouette yourself (74 questions, Rules 23–30)
- Rule-based tests with answer explanations
- Exam mode — a timed mock exam 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
Practice under exam-like conditions. 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 customizable: choose from multiple font types, adjust the font size, and switch between three color 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 exams
- Yacht skippers and RYA / ASA candidates
- Coastal and offshore sailors who need a reliable collision avoidance reference
- Anyone sitting a maritime authority exam (MCA, USCG, AMSA, Transport Canada, MNI)
WHY COLREG 72
International collision avoidance rules are the foundation of safe navigation. Whether you are studying for the first time or refreshing knowledge before an exam, this app gives you the full text, visual aids, practice tests, and a timed practice exam to build true confidence.
One-time purchase. No subscription. No ads. Study offline, anytime.
Download COLREG 72 and arrive at your exam prepared.
COLREG 72 is an independent study app. It is not affiliated with or endorsed by the IMO, the U.S. Coast Guard or any maritime authority, and its practice questions are not official exam questions.
Hi!I found some typos (#11 and one or two others). Otherwise great, thanks!
Developer Response
Thank you for your feedback and for spotting those typos — we really appreciate your attention to detail.We’ll review and fix them in the next update. Glad to hear you’re enjoying the app overall!
German
The app is now fully available in German: interface, rule texts, theory and all questions.
Back to tests
When you finish a test, the completion dialog now offers Back to tests instead of Cancel.
Place the Lights: corrected vessel silhouettes and light positions, clearer wording in several questions (optional lights, pushing vessels, towed objects, anchor lights). Text fixes in light questions, rule texts and translations.
Version 2.8.2
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, for example, based 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
