Question 39 UFV02 - Mate - Uninspected Fishing Vessels

The Correct Answer is C. **Explanation for Option C (four to six seconds):** Option C ("four to six seconds") is correct based on the Convention on the International Regulations for Preventing Collisions at Sea (COLREGs), Annex III, Section 1(c) and Section 2(a)(iii). A prolonged blast is defined as a blast of from **four to six seconds' duration**. This signal is used by a power-driven vessel when sounding fog signals, regardless of whether the vessel is making way or is underway but stopped and not making way (using the signals prescribed in Rule 35(a) and 35(b), respectively). **Explanation for Incorrect Options:** * **A) about one second:** This duration defines a **short blast**, which is used primarily for maneuvering and warning signals (Rule 34), not for the prolonged fog signals required under Rule 35. * **B) two to four seconds:** This duration falls outside the internationally defined range for both a short blast (approximately 1 second) and a prolonged blast (4 to 6 seconds). * **D) eight to ten seconds:** This duration is too long. While sound signals must be clearly distinguishable, 4 to 6 seconds is the maximum prescribed duration for a prolonged blast used in fog signals.