Question 40 ONC03 - Master LT 500-1600 GRT

The Correct Answer is A. **Explanation for Option A (about 1 second):** Option A ("about 1 second") is correct because it accurately defines a "short blast" as specified in Rule 32 of both the International Regulations for Preventing Collisions at Sea (COLREGs) and the Inland Navigation Rules. * **Rule 32 (Definitions):** This rule defines the duration of blasts for sound signals: * A **short blast** is a blast of about one second's duration. * A **prolonged blast** is a blast of from four to six seconds' duration. The whistle signals used in head-on and/or crossing situations (Maneuvering and Warning Signals under Rule 34, such as "I intend to leave you on my port/starboard side," or "I am backing up") are typically composed of one, two, or three **short blasts**. Therefore, the duration of each individual blast in these situations is about 1 second. *** **Explanation of Incorrect Options:** * **B) 2 to 4 seconds:** This duration falls between a short blast (1 second) and a prolonged blast (4–6 seconds). It does not correspond to a standard defined duration for maneuvering signals under the Rules. * **C) 4 to 6 seconds:** This duration defines a **prolonged blast** (Rule 32). Prolonged blasts are used for different purposes, such as warning signals (Rule 34(e) Inland) or signals used when maneuvering out of a slip or when visibility is restricted (Rule 35), but they are not the components of the standard head-on or crossing maneuvering signals (e.g., one short blast, two short blasts, or three short blasts). * **D) 8 to 10 seconds:** This duration is significantly longer than any specified standard blast duration defined by COLREGs/Inland Rules.