Question 40 GLI01 - Master-Unlimited Tonnage

The Correct Answer is A. **Explanation for A ("about 1 second"):** Option A is correct because both the International and Inland Rules of the Road (specifically Rule 34, Maneuvering and Warning Signals) define the whistle signals used for maneuvering (such as in head-on or crossing situations) by specifying two types of blasts: 1. **Short blast:** Defined as a blast of about one second's duration. 2. **Prolonged blast:** Defined as a blast of from four to six seconds' duration. The signals used for indicating intent in maneuvering situations (e.g., "I am altering my course to starboard," or "I intend to overtake you on your starboard side") are composed of short blasts (one, two, or three short blasts). Therefore, the duration of each blast in these signals is "about 1 second." **Explanation of Incorrect Options:** * **B) 2 to 4 seconds:** This range does not correspond to any specific maneuvering signal blast duration defined by the Rules (Rule 34). It is longer than a short blast and shorter than a prolonged blast. * **C) 4 to 6 seconds:** This range defines a **prolonged blast**. Prolonged blasts are used for warning signals (Rule 34(e)), signals indicating departure from a berth (Rule 34(c)), or signals used in restricted visibility (Rule 35). They are *not* the duration of each blast in the short-blast signals used for indicating intent in head-on and crossing maneuvers. * **D) 8 to 10 seconds:** This duration is significantly longer than any defined standard blast duration in the Rules.