Question 39 GLI06 - Master or Mate of LT 100 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(c). This section specifies that a "prolonged blast" means a blast of from **four to six seconds** duration. This definition applies to both International and Inland waters unless specifically superseded by a relevant Inland rule (which generally adopt the COLREGs definition for this specific signal characteristic). **Why the other options are incorrect:** * **A) about one second:** This duration is defined as a "short blast," not a prolonged blast. Short blasts are typically used in maneuvering and warning signals (Rule 34), not the required fog signals (Rule 35) for a power-driven vessel. * **B) two to four seconds:** While close, this range falls short of the minimum six seconds required for the upper limit of a prolonged blast as defined by COLREGs. * **D) eight to ten seconds:** This duration significantly exceeds the maximum six seconds allowed for a prolonged blast, potentially confusing the signal with distress signals or other non-standard signals.