In a fog, what action should a power-driven vessel take when navigating?

When navigating in fog, a power-driven vessel must prioritize safety and take appropriate actions to avoid collisions. Reducing speed and being prepared to stop is the correct action because it allows the vessel to maintain better control in low visibility conditions. By slowing down, the crew can better assess their surroundings and respond to any nearby vessels or obstacles. This approach not only enhances the safety of the vessel but also follows the rules established for vessels to take precautionary measures in restricted visibility.

Navigating at a reduced speed enables the crew to hear and interpret sound signals from other vessels, which can be crucial in fog. Additionally, the vessel's ability to stop or alter its course quickly in response to sudden appearances of other vessels or navigational hazards is vital in preventing potential accidents.

Maintaining normal speed, increasing speed, or anchoring in such conditions may lead to dangerous situations. Speeding could reduce reaction time and increase the risk of collision, while anchoring may create hazards for other vessels if they are not aware of the anchored position. Thus, reducing speed while being ready to stop underscores the importance of exercising caution in fog or other restricted visibility conditions.