Question 40 GLI04 - Mate of LT 500-1600 GRT

The Correct Answer is A. ### Explanation for Option A (Correct Answer) Option A, "about 1 second," is the correct duration because both the International and Inland Rules of the Road (COLREGs) define the whistle signals used in maneuvering and warning situations (including head-on and crossing) using specific terms: * **Short Blast:** The signals used to indicate intent or movement (like "I intend to leave you on my port/starboard side," or "I am altering course to port/starboard") are defined as **short blasts**. * **Definition of Short Blast:** A short blast is explicitly defined in Rule 32 of COLREGs (which applies internationally and is mirrored in the Inland Rules) as **a blast of about one second's duration.** Therefore, any whistle signal used in head-on or crossing situations (e.g., one short blast, two short blasts, or three short blasts) consists of individual blasts that last about one second. ### Why Other Options Are Incorrect **B) 2 to 4 seconds:** This duration is too long for a short blast. While a **prolonged blast** is defined as 4 to 6 seconds, 2 to 4 seconds falls outside the standardized definitions for either a short or a prolonged blast. **C) 4 to 6 seconds:** This duration defines a **prolonged blast** (a blast of from four to six seconds' duration), which is used primarily for warning signals (Rule 35, e.g., restricted visibility signals) and vessel departure/approach signals (Rule 34, Inland only), but it is not the duration of the individual blasts used in the short blast maneuvering signals (Rule 34, head-on/crossing). **D) 8 to 10 seconds:** This duration is significantly longer than any defined standard blast (short or prolonged) and is not used for standardized whistle signaling under COLREGs.