COLlision REGulations
One Rule Emailed per Day

Home Progress Manage The Manual Guides
Home Progress Manage The Manual Guides

Learn the COLREGS — Don't Just Read Them

Rules include the official text, a plain-English explanation, images, a real-world example, and practice questions with detailed answers.

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USCG COLREGS
Integrated International & Inland
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Rules in this Section apply in any condition of visibility.

Rule 4 may be the shortest rule in the book, but don’t overlook it. Its single sentence sets the stage for everything through Rule 19. In all conditions of visibility—whether you’re cruising on a clear, sunny afternoon, running at night, or navigating through rain or thick fog—the rules for lookout, safe speed, risk of collision, and collision avoidance all apply. These rules don’t switch on when visibility gets bad; they are always in effect.

Guides

In-depth articles that put related rules side by side.

International vs. Inland Rules: What Changes When You Cross the Line
The U.S. has two versions of the Navigation Rules. Learn which one applies where you boat, and the practical differences in right-of-way, whistle signals, lights and fog signals.
Vessel Lights at Night: A Practical Guide to What You Are Seeing
Learn to read the lights on the water after dark: power, sail, towing, fishing, restricted and anchored vessels, and how to tell which way a boat is heading and who must give way.
Crossing, Overtaking and Head-On Situations Compared
Who gives way, who stands on, and what each boat should do in the three ways two vessels meet. A side-by-side guide to Rules 13 to 17, with worked examples and common mistakes.

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