Question 39

The Correct Answer is C **Explanation for Option C (four to six seconds):** Option C is correct because this is the specific duration defined in the International Regulations for Preventing Collisions at Sea (COLREGs) for a prolonged blast. According to Rule 32(b) regarding Definitions, "The term 'prolonged blast' means a blast of from four to six seconds' duration." This definition applies universally for both International and Inland waters and is used by power-driven vessels when making way or when underway but stopped in restricted visibility (fog, mist, etc.). *** **Explanation of Incorrect Options:** * **A) about one second:** This duration defines a **short blast** (COLREGs Rule 32(a)). Short blasts are used primarily in maneuvering signals (e.g., one short blast means "I am altering my course to starboard"). * **B) two to four seconds:** This duration is too long to be considered a short blast and too short to be considered a prolonged blast. It does not correspond to a recognized standard fog signal. * **D) eight to ten seconds:** This duration is significantly longer than the defined limit for a prolonged blast and is not a standard signal used under the COLREGs for fog. Signals must be standardized and distinct to prevent confusion.