How many parts are there in the COLREGs?

The correct answer is based on the structure of the COLREGs, which consists of four distinct parts. These parts are organized to cover various aspects of navigation and the responsibilities of vessels at sea to prevent collisions.

Part A introduces the general rules and definitions, while Part B outlines specific conduct for different types of vessels, such as sailing and power-driven vessels. Part C focuses on the conduct of vessels in restricted visibility and includes navigational light and shape requirements. Finally, Part D discusses the responsibilities of vessels in terms of safe navigation and avoiding collisions.

Understanding this structure is essential for mariners, as it provides a comprehensive framework to follow for safe navigation and compliance with international maritime law. Each part plays a crucial role in ensuring that vessels can operate safely and effectively in a variety of scenarios on the water.