What is the focus of Part B Section 3?

Part B Section 3 of the COLREGs focuses specifically on the conduct of vessels in restricted visibility. This section provides guidelines and rules for keeping safe navigation when visibility is limited, such as in fog, heavy rain, or darkness. The regulations outlined here emphasize the importance of taking appropriate action to avoid collisions when visual cues are diminished and stress measures that vessels must take, including sounding signals and proceeding at a safe speed.

Understanding this aspect is critical because restricted visibility situations present unique challenges for mariners, making the rules under this section paramount for ensuring safety at sea. While other sections deal with various conditions, the emphasis on restricted visibility highlights the need for additional caution and specific actions to navigate safely in these scenarios.