COLREG Rule 3 – General Definitions

Understanding the definitions in COLREG Rule 3 is essential for every mariner, as these terms form the foundation for correctly applying the International Regulations for Preventing Collisions at Sea. Clear knowledge of these definitions helps ensure safe navigation and effective decision-making on board.

Key Definitions Covered:

• Vessel

• Power-Driven Vessel ️

• Sailing Vessel

• Vessel Engaged in Fishing

• Underway

• At Anchor

• Aground

• Length Overall (LOA)

• Side Lights

• Masthead Light

• Stern Light

• Towing & Pushing Vessels

Did You Know? Many COLREG examination and onboard navigation questions begin with the definitions in Rule 3, making it one of the most important rules for every deck officer and seafarer to master.

Question for Mariners & Shipping Enthusiasts: Which COLREG definition do you think is most commonly misunderstood on board?

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