What is the duration of a prolonged blast?

A prolonged blast is defined as a sound signal made by a vessel to communicate a warning or signal its presence over a distance, particularly in fog or other conditions of limited visibility. The definition according to the COLREGs (International Regulations for Preventing Collisions at Sea) specifies that a prolonged blast lasts from four to six seconds. This duration is important because it ensures that vessels can be alerted to potential collisions or hazards in a timely manner.

The chosen answer aligns with this definition and is critical in maritime communication. The standardized duration helps ensure that signals are universally recognized and understood among different vessels. This consistency is vital for safety at sea, as it enables mariners to react appropriately to the signals they encounter.

Understanding the correct duration of a prolonged blast is essential for all seafarers, as it fosters effective communication in challenging conditions and enhances navigational safety.