Question 3 ONC06 - Master LT 100 GRT

The Correct Answer is A **Why option A ("A law enforcement vessel") is correct:** Under the Inland Navigation Rules (specifically 33 CFR § 86.37), a flashing blue light is an identification signal designated for use by a **law enforcement vessel** of the United States, including federal, state, and local agencies. This light may be displayed when the vessel is engaged in official duties that require the identification of the vessel as a law enforcement vessel. **Why the other options are incorrect:** * **B) A work boat:** Work boats typically use lights appropriate to their specific operation (e.g., lights for dredging or underwater operations, or standard lights for vessels restricted in their ability to maneuver), but the flashing blue light is not the designated identification signal for a general work boat. * **C) A vessel engaged in a race:** Vessels engaged in races do not have a specific, required flashing blue light signal under the Inland Rules. Their visibility relies on standard navigation lights and, if applicable, specific rules set by the race organizers. * **D) A vessel transferring hazardous cargo:** Vessels carrying or transferring hazardous cargo must display specific warning signals (such as a vessel constrained by draft, or specific day shapes/lights related to towing/pushing barges, if applicable) but the flashing blue light is not associated with the cargo itself.