What is the duration for a PROLONGED BLAST?

A prolonged blast, often used in maritime signaling, is defined as a sound that lasts for a specific duration to convey particular meanings, especially in navigation contexts. The standard duration for a prolonged blast is 4 to 6 seconds. This length is essential for ensuring that the signal is distinctly heard and understood by other vessels or for signaling intentions in reduced visibility or dense traffic.

Using this duration helps maintain clarity and safety on the water, as shorter blasts might be confused with other signals or be insufficient to alert nearby vessels. This standardization of prolonged blast timing is crucial within the rules of navigation to facilitate effective communication among mariners.