What is the correct response for a pilot vessel when signaling with fog?

A pilot vessel signaling in fog conditions should sound four short blasts. This specific sound signal indicates the presence of a pilot vessel and is recognized internationally as a way of communicating its status to other vessels. The purpose of these sound signals is to ensure safety on the water, particularly in reduced visibility conditions such as fog. Understanding these signals is crucial for maintaining navigational safety and avoiding potential collisions at sea.

Vessels not using this specific sound signal may not adequately inform surrounding vessels of their presence or intentions, which can lead to misunderstandings or navigational hazards in poor visibility. In foggy conditions, mariners rely heavily on auditory signals, so it's vital to know the correct signals for different vessel types.