Question 3 ONC01 - Master/Chief Mate Unlimited Tonnage

The Correct Answer is A **Why option A ("A law enforcement vessel") is correct:** Under the Inland Navigation Rules, a vessel belonging to a law enforcement agency, when engaged in direct law enforcement activities and displaying the authorized distinguishing marks of that agency, may display a flashing blue light. This signal is used to alert other vessels to the law enforcement presence and operation. **Why the other options are incorrect:** * **B) A work boat:** A work boat (or a vessel engaged in diving operations) may display signals such as shapes (e.g., restricted in ability to maneuver signals) or lights (e.g., red-white-red vertical lights), but the Inland Rules do not prescribe a flashing blue light specifically for a general "work boat" or diving vessel. * **C) A vessel engaged in a race:** Vessels engaged in a race or regatta typically do not display specialized lights under the standard Navigation Rules. They must comply with the rules regarding crossing, overtaking, and meeting, but a flashing blue light is not an authorized racing signal. * **D) A vessel transferring hazardous cargo:** Vessels handling hazardous cargo must follow specific regulations regarding safety, communication, and security, but the flashing blue light is not the prescribed signaling light or shape for this activity under the Inland Rules.