Question 19 RVR03 - Mate of LT 500-1600 GRT

The Correct Answer is C The duration of each prolonged blast on whistle signals used by a power-driven vessel in fog, for both International and Inland waters, is defined by the navigation rules (specifically Rule 33(a) and the definition of 'prolonged blast' in Rule 3(b)). A **prolonged blast** is defined as a blast of $\mathbf{4}$ to $\mathbf{6}$ seconds' duration. This signal is used by a power-driven vessel when making way, or by a power-driven vessel that is underway but stopped (not making way), to signal its presence and status in restricted visibility. **Why the other options are incorrect:** * **A) about one second:** This duration is characteristic of a **short blast**, which is defined as a blast of about one second duration. Short blasts are used primarily during maneuvering signals in sight of other vessels, not for the primary fog signals of a power-driven vessel. * **B) two to four seconds:** This duration is neither a short blast nor a prolonged blast according to the Rules. It falls outside the specified parameters for standard signaling blasts. * **D) eight to ten seconds:** This duration is too long for a standard 'prolonged blast.' While a vessel might use a sustained sound for danger signals (multiple short blasts or rapid ringing of the bell), the specific definition of a prolonged blast is capped at six seconds.