Question 3 ONC05 - Master or Mate of LT 200 GRT

The Correct Answer is A **Why Option A ("A law enforcement vessel") is correct:** Under the Inland Navigation Rules (33 CFR Subchapter E, specifically Rule 23, Annex I and Annex V provisions), a flashing blue light is a signal used by vessels operated by the United States Coast Guard or a Federal, State, or local law enforcement agency. This light is intended to indicate that the vessel is involved in law enforcement activities and is a signal for other vessels to heed the law enforcement vessel's instructions. **Why the other options are incorrect:** * **B) A work boat:** Work boats typically use high-intensity flashing white lights (or, if engaged in dredging or underwater operations, specific green and white signals) but not a flashing blue light, which is reserved for law enforcement. * **C) A vessel engaged in a race:** Vessels engaged in races do not have a specific reserved light signal under the standard Navigation Rules. * **D) A vessel transferring hazardous cargo:** Vessels handling dangerous goods or involved in towing operations that are restricted in their ability to maneuver use lights and shapes defined in Rule 27, which do not include a flashing blue light.