What initial actions should be taken when in restricted visibility?

When encountering restricted visibility, the appropriate initial action is to prepare to anchor while reducing speed. This choice is vital for ensuring the safety of the vessel and its crew. Reducing speed allows for better control of the vessel and increases the reaction time to any potential hazards that may arise, such as other vessels or navigational obstacles. By anchoring and preparing to let go, the vessel can maintain its position and avoid the risk of collision in the limited visibility.

Taking such precautions is aligned with maritime regulations and best practices, which emphasize the importance of maneuvering cautiously in low-visibility situations. By slowing down and preparing to anchor, the crew can ensure that they are in the best position to react to unforeseen circumstances while also signaling to other vessels their presence.

In contrast, engaging autopilot would be inappropriate in restricted visibility, as it may lead to a lack of situational awareness, and increasing speed would only heighten the risk of collision or accidents, as visibility does not improve with speed. Additionally, stopping all navigation lights would be extremely dangerous, as it would prevent other vessels from seeing the ship, thereby increasing the risk of collision.