Rules of the road
COLREG 72 Practice
Free short quizzes for navigation lights, sound signals, and rules-of-the-road exam prep.
4.8 ★ on Google Play and the App Store · 100K+ downloads
Mobile trainer
A complete COLREG practice app in your pocket
Study navigation lights, sound signals, give-way situations, and rule references with focused drills built for quick repetition.
Visual drills
Train recognition with vessel lights, shapes, and exam-style situations.
Rule-focused practice
Move from quick web checks into structured COLREG revision in the app.
Fast repetition
Short sessions make it easy to review weak topics before an exam or watch.
Full trainer
Continue full practice in the app
Use the free web quiz for a quick check, then move to the app for the complete practice flow.
4.8 ★ on Google Play and the App Store · 100K+ downloads
FAQ
COLREG in short
What is COLREG?
COLREG is the International Regulations for Preventing Collisions at Sea, 1972, adopted by the IMO. It sets the rules of the road for every vessel: who gives way, which lights and shapes to show, and which sound signals to use.
How many COLREG rules are there?
There are 41 rules in six parts: Part A General (1–3), Part B Steering and sailing (4–19), Part C Lights and shapes (20–31), Part D Sound and light signals (32–37), Part E Exemptions (38) and Part F Verification of compliance (39–41), plus four annexes.
Is the COLREG practice test free?
Yes. Every quiz on this site is free and needs no sign-up. The COLREG 72 app adds the full question bank with an explanation, rule reference and diagram for every question, and works offline.
Who is this COLREG practice for?
Yachtmaster and skipper candidates, deck cadets, OOW and master exam candidates, and anyone standing a watch who wants to refresh lights, shapes, signals and give-way rules.