Question 40 GLI06 - Master or Mate of LT 100 GRT

The Correct Answer is A 1. **Explanation for Option A (about 1 second):** Option A is correct because both the International and Inland Rules of the Road (COLREGs) define the duration of a signal used to convey maneuvering intent (such as those used in head-on and/or crossing situations) in Rule 32. A "short blast" is defined as a blast of about one second's duration. These short blasts are used for signals like "I intend to leave you on my port side" (one short blast), "I intend to leave you on my starboard side" (two short blasts), and "I am operating astern propulsion" (three short blasts). 2. **Explanation for Option B (2 to 4 seconds):** This duration range is incorrect. A "prolonged blast" is defined as a blast of 4 to 6 seconds (see explanation for C). 2 to 4 seconds does not correspond to any standard, defined blast duration for signaling intent or warning under COLREGs/Inland Rules. 3. **Explanation for Option C (4 to 6 seconds):** This duration range is incorrect. 4 to 6 seconds defines a **prolonged blast**. Prolonged blasts are used primarily for warning or positional signals, such as signaling departure from a dock/berth, or signals required during restricted visibility (fog signals), not for the maneuvering signals used in head-on or crossing situations (which require short blasts). 4. **Explanation for Option D (8 to 10 seconds):** This duration is incorrect. This range is significantly longer than any standard prescribed signal blast (short or prolonged) and would not be recognized as a valid whistle signal under COLREGs/Inland Rules.