What type of signaling is required in low visibility situations?

In low visibility situations, light signals are especially important because they enhance visibility and can be seen at greater distances than other forms of communication. When visibility is limited, such as in fog or heavy rain, visual signals like flags are ineffective because they may not be noticed by other vessels. Light signals, which can include the use of searchlights, signal lights, or flares, are designed to carry over distances and can pierce through less-than-ideal conditions.

Sound signals are also useful in low visibility situations, serving as an alert system for nearby vessels. However, they do not provide the same level of positional awareness that light signals do. Therefore, while sound may play a supplementary role, light signals are the primary mode of signalling required to effectively communicate the presence and position of a vessel in low visibility environments.