Stop memorising the regulations. Start mastering them.
Maritime Master - COLREG is the definitive interactive guide to the International Regulations for Preventing Collisions at Sea (COLREGs / IRPCS). Designed for deck officers, yachtmasters, and serious boaters, this app replaces dry textbooks with intuitive visual simulations.
Whether you are preparing for your exams, or simply need a reliable pocket reference at sea, Maritime Master helps you learn faster and retain more.
Most apps just copy-paste the rules. We bring them to life.
Interactive Scenarios: Don’t just read Rule 14 (Head-on) or Rule 15 (Crossing), control the vessels on screen to see exactly who gives way.
Visual Light Sectors: Build the "Mercedes" arc yourself. Finally understand exactly what 112.5°, 135°, and 225° look like in real life.
Smart Quizzes: Test your knowledge with "Exam Trap" questions that highlight common mistakes students make in oral exams.
KEY FEATURES
Complete Rule Book (1-38): Full, searchable text of the Steering and Sailing Rules, perfectly formatted for mobile.
Navigation Lights & Shapes: Toggle between Day, Night, and Fog modes to master Rule 20. See instantly how shapes change for RAM, CBD, NUC, and Fishing vessels.
Restricted Visibility (Rule 19): A dedicated Radar Simulator helps you decide whether to turn to starboard or reduce speed in fog.
Sound & Distress Signals: Interactive buttons to hear blast patterns (Rule 34/35) and visualize Annex IV distress signals like Red Flares and Smoke.
Steering Rules Visualized: * Overtaking (Rule 13): Clearly see the overtaking sector vs. crossing.
Narrow Channels (Rule 9): Master positioning and bends.
TSS (Rule 10): Visualize lane discipline and crossing angles.
Offline Ready: No internet required. Study in your bunk, on watch (if allowed!), or commuting.
PERFECT FOR:
Student Officers: Cadets, OOW, Chief Mate, Master 3000 (MCA / USCG / International).
Yachting Pros: RYA Yachtmaster Offshore / Ocean, Master 200/500.
Leisure Boaters: Day Skipper, Powerboat Level 2, ICC
Sailing Schools: A perfect visual aid for instructors teaching the Rules of the Road.
INCLUDES:
Part A: General
Part B: Steering and Sailing Rules (Sections I, II, III)
Part C: Lights and Shapes
Part D: Sound and Light Signals
Part E: Exemptions
Annexes (Distress Signals, etc.)
Download Maritime Master - COLREG today and pass your COLREGs exams with confidence.
Ratings & Reviews
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Fixed a UI issue on the main screen
Other bug fixes and improvements
Version 1.3
The developer, MARITIME MASTER LIMITED, 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
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
Larger Text
Dark Interface
Sufficient Contrast
Reduced Motion
Information
Provider
MARITIME MASTER LIMITED
Size
5.4 MB
Category
Education
Compatibility
Requires iOS 17.6 or later.
iPhone Requires iOS 17.6 or later.
iPad Requires iPadOS 17.6 or later.
Mac Requires macOS 14.6 or later and a Mac with Apple M1 chip or later.