Question 36 RVR04 - Master or Mate of LT 200 GRT

The Correct Answer is A. **Explanation for Option A (about 1 second):** Option A ("about 1 second") is correct because it defines the duration of a **short blast** of the whistle. According to Rule 32 of the International Regulations for Preventing Collisions at Sea (COLREGs) and the corresponding Inland Rules, sound signals have specific definitions: * **Short blast:** A blast of about one second's duration. * **Prolonged blast:** A blast of from four to six seconds' duration. The whistle signals used in head-on and/or crossing situations for maneuvering and warning (such as 1 short blast for "I am altering course to starboard," 2 short blasts for "I am altering course to port," and 3 short blasts for "I am operating astern propulsion") all require the use of **short blasts**. Therefore, the duration of each blast in these maneuvering signals is approximately one second. **Explanation for Incorrect Options:** * **B) 2 to 4 seconds:** This duration falls between a short blast (about 1 second) and a prolonged blast (4 to 6 seconds) and is not a defined or regulatory duration for maneuvering signals. * **C) 4 to 6 seconds:** This defines a **prolonged blast**. Prolonged blasts are used for warning (like the required signal when approaching a bend, or the restricted visibility signals) but are *not* the signals used for the maneuvering intentions in head-on or crossing situations (which require short blasts). * **D) 8 to 10 seconds:** This duration is significantly longer than any defined regulatory whistle signal (short or prolonged) and is incorrect.