Under COLREGs, what action should a vessel take if visibility is compromised?

In situations of compromised visibility, such as fog, heavy rain, or darkness, it is prudent for a vessel to reduce speed and navigate with extreme caution. This approach aligns with the COLREGs, particularly Rule 6, which emphasizes the importance of safe speed to ensure that a vessel can take effective action to avoid collisions.

By reducing speed, a vessel allows more time to react if another craft or obstacle is detected. Navigating with caution also means being vigilant for sound signals, using radar or other navigational aids if available, and being prepared to take evasive action as required. This prudent approach helps ensure not just the safety of the vessel itself but also of others in the waterway. Increasing speed, maintaining course, or solely relying on radar could lead to dangerous situations where the vessel would not be able to stop or maneuver effectively in time to avoid a collision.