What should a vessel do when meeting in fog, where visibility is limited?

When a vessel encounters fog and visibility is limited, the appropriate action is to reduce speed and sound appropriate signals. Reducing speed is essential because it allows for better maneuverability and reaction time in case another vessel is encountered, mitigating the risk of collision. At slower speeds, the operator can more effectively listen for sounds and observe any nearby vessels that may not be visible.

Additionally, sounding appropriate signals is a critical part of navigating in fog. The Rules of the Road mandate that vessels must use sound signals to communicate their presence and intentions to others in the area, as visual cues are limited. For example, a power-driven vessel underway generally must sound a prolonged blast every two minutes, while vessels at anchor must sound at least one bell every five minutes. This communication helps ensure that other navigators are aware of your presence, which is especially crucial in reduced visibility situations.

In contrast, speeding up would not only increase the risk of a collision but also would make it difficult to respond quickly to any hazards that might suddenly appear. Anchoring immediately could be risky if the vessel is in a navigational channel or area of traffic, potentially creating new hazards for other vessels. Continuing at normal speed disregards the need for caution in fog and can lead to dangerous situations.