What does Rule 19 concern?

Rule 19 of the COLREGs specifically addresses the conduct of vessels in restricted visibility. This rule is crucial because it lays out certain actions that vessels must take when they are navigating in conditions where visibility is significantly limited, such as in fog, heavy rain, or snow.

In these scenarios, it becomes challenging for vessels to see other vessels, navigational markers, or hazards, increasing the risk of collisions. Therefore, the rule emphasizes the importance of safe navigation practices, which includes reducing speed, ensuring proper lookout, and making sound signals to communicate with other vessels. The focus on restricted visibility is essential to mitigate danger and help mariners make informed decisions to avoid collisions.

The other options, while related to navigational safety, do not specifically pertain to the precise guidelines outlined in Rule 19, reinforcing the importance of this rule in ensuring safe maritime practices during conditions of limited visibility.