Which rules cover lights and shapes in maritime navigation?

The correct choice focuses on Rules 20-31, which specifically address the requirements for navigation lights and shapes that vessels must exhibit to ensure safe navigation and prevent collisions at sea. These rules outline the visibility and configuration of lights for different types of vessels, the conditions under which they should be used, and the signaling methods from a visual perspective.

Understanding the importance of these rules helps mariners identify the characteristics of nearby vessels, including their type, size, and whether they are at anchor or underway. For instance, the rules state which lights must be shown by vessels at night or during reduced visibility and also dictate the shapes that must be displayed in daylight conditions, particularly for fishing vessels, pilot vessels, and others engaged in specific activities.

The other sets of rules, while foundational to navigation and safety, do not specifically address the details of lights and shapes. The choices covering Rules 1-3 pertain to the general application and responsibility under the COLREGs. Rules 4-18 cover the safe conduct of vessels in sight of one another, addressing the conduct of vessels in various situations at sea, while Rules 32-37 deal with additional exceptional cases like vessels engaged in fishing or not under command. Thus, the specified range of Rules 20