A "short blast" on the whistle has a duration of __________.

A "short blast" on the whistle is defined as having a duration of 1 second. This standard duration is crucial for understanding communication between vessels, especially in situations where visibility may be limited or when vessels are navigating in close proximity to each other.

The 1-second duration allows for a clear and concise signal that can be readily interpreted by nearby vessels, helping to prevent misunderstandings and potential collisions. This uniformity in signaling is essential for maintaining safety on the water. The other choices indicate durations that are not aligned with the established maritime signaling conventions. Understanding these distinctions is vital for effective communication and adherence to navigation rules.