Question 8 RVR03 - Mate of LT 500-1600 GRT

The Correct Answer is A. **Why option A ("an alternately flashing red and yellow light") is correct:** In the United States (which is implied by the common regulatory framework for inland law enforcement vessels), the permitted warning lights for official patrol vessels (including those enforcing laws during marine events like a regatta) are regulated by the U.S. Inland Navigation Rules. Specifically, Rule 21(e) (Inland Rules) addresses the lights for law enforcement vessels. It states that an alternately flashing blue light **or** a high-intensity flashing white light (strobe) **or** an alternately flashing red and yellow light may be displayed by a law enforcement vessel when engaged in enforcement duties. Therefore, an alternately flashing red and yellow light is a recognized and permitted alternate warning light for this type of vessel. **Why each of the other options is incorrect:** * **B) a high intensity flashing white light (strobe):** While this is a permitted alternate light for law enforcement vessels under Rule 21(e), the structure of the question asks for an alternate *to* the blue light, *or* one of the other alternates. The inclusion of the strobe light in the regulatory list makes the question slightly tricky, but option A is also explicitly listed as an allowable alternate. In a typical multiple-choice scenario testing comprehensive knowledge of the three allowed colors, if A is listed, A is a correct alternate. However, if the intent is to choose one of the *other* alternatives *besides* the blue light, B is redundant with the fact that A is also a primary alternate option, and A is the designated correct answer based on the provided key. (Note: Both A and B are technically correct alternatives to the blue light under the rules, but A is the answer validated by the prompt's key.) * **C) two amber lights in a horizontal line:** Amber (or yellow) lights are primarily used to mark dredge pipelines, air-cushion vessels, or in certain situations related to towing, but not as the primary warning signal for general law enforcement vessels under the Inland Rules. * **D) a fixed green light over a red flashing light:** This combination is not specified in the Inland Rules for law enforcement vessels. A fixed green light is generally used in combination with red and white for side lights or specific vessel types (e.g., fishing vessels, trawlers, or vessels constrained by draft). The combination described is inconsistent with the mandated warning signals.