Question 39

The Correct Answer is C 1. **Why option C ("four to six seconds") is correct:** Rule 32(b) of the International Regulations for Preventing Collisions at Sea (COLREGs) defines the characteristics of sound signals. It states: "The term 'prolonged blast' means a blast of from **four to six seconds' duration**." This definition applies universally to all sound signals requiring a prolonged blast, including those made by a power-driven vessel in or near an area of restricted visibility (fog), whether making way or underway but stopped. 2. **Why the other options are incorrect:** * **A) about one second:** This duration is defined by Rule 32(b) as a **short blast**. It is used in maneuvers and warnings (e.g., "I am altering my course to starboard"). * **B) two to four seconds:** This duration does not correspond to any standard, defined whistle signal duration in the COLREGs. * **D) eight to ten seconds:** This duration is significantly longer than the defined prolonged blast and is not used for standardized whistle signals under the COLREGs.