Question 3 GLI06 - Master or Mate of LT 100 GRT

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, may display a rapidly flashing blue light. This signal is reserved specifically for law enforcement vessels in the U.S. Inland Waters (33 CFR § 88.11). **Why Option B ("A work boat") is incorrect:** Work boats or dredges display all-round flashing yellow lights to signify special operations (like dredging, pipeline operations, etc.), not flashing blue lights. **Why Option C ("A vessel engaged in a race") is incorrect:** The Navigation Rules do not designate a specific flashing blue light for vessels engaged in races. Vessels participating in races must adhere to the standard rules and signals unless otherwise agreed upon in the racing regulations (which typically do not supersede collision regulations). **Why Option D ("A vessel transferring hazardous cargo") is incorrect:** A vessel transferring hazardous cargo does not use a flashing blue light as a required signal. Such vessels must display standard navigation lights and shapes corresponding to their status (e.g., restricted in ability to maneuver if applicable) and may also fly specific flags (like the 'B' flag for dangerous goods).