Question 36 RVR05 - Master of LT 100 GRT

The Correct Answer is A **Explanation for Option A (Correct Answer):** Option A, "about 1 second," is correct because the whistle signals used to indicate maneuver intentions (such as meeting/head-on or crossing situations) are defined by the Navigation Rules (COLREGs/Inland Rules) as **short blasts**. * **Rule 32(b)** defines a **short blast** as a blast of about one second's duration. * These signals communicate intentions (e.g., I am altering course to starboard, I intend to overtake you on your starboard side, etc.) and must be precise and immediately understood. Using a standardized "short blast" duration of about one second ensures clarity and adherence to the required signaling procedures in these critical maneuvering situations. **Explanation for Incorrect Options:** * **B) 2 to 4 seconds:** This duration is too long for a short blast. While 4 to 6 seconds is the definition of a **prolonged blast** (Rule 32(c)), 2 to 4 seconds does not correspond to any defined maneuver signal duration. * **C) 4 to 6 seconds:** This duration defines a **prolonged blast** (Rule 32(c)). Prolonged blasts are used for warning signals (like leaving a dock or approaching a bend) or signals indicating restricted visibility, but not for the specific maneuver intention signals used in head-on or crossing situations (which require short blasts). * **D) 8 to 10 seconds:** This duration is far too long for any standard whistle signal defined in the Navigation Rules. It would be confusing and ambiguous in a maneuvering context.