Question 39 GLI03 - Master-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, whether making way or underway but not making way, is defined by the **International Regulations for Preventing Collisions at Sea (COLREGs)**, Annex III, Section 1(a). **Explanation for Option C (four to six seconds):** COLREGs, Annex III, Section 1(a), which defines the technical characteristics of sound signals, states that a **prolonged blast** shall mean a blast of from **four to six seconds' duration**. This standard applies universally to both international and inland waters that adhere to COLREGs (Rule 35 specifies the use of this sound signal). **Explanation for Incorrect Options:** * **A) about one second:** This duration is defined as a **short blast** in COLREGs (Annex III, Section 1(a)). A short blast is used for maneuvering and warning signals (Rule 34), not the prolonged blast required for fog signals (Rule 35). * **B) two to four seconds:** This duration is too short for a standard prolonged blast (which must be at least four seconds) and too long for a short blast (which is about one second). It does not correspond to any defined standardized blast duration. * **D) eight to ten seconds:** This duration is significantly longer than the defined maximum for a prolonged blast (six seconds). While a single blast might last this long in a non-standard situation, it is outside the regulatory definition of a prolonged blast used for fog signaling.