Question 3 GLI05 - 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, a vessel belonging to a federal, state, or local law enforcement agency may display a flashing blue light when engaged in official duties and operating as an authorized law enforcement vessel. This signal is unique to law enforcement for identification purposes on the U.S. inland waters. **Why the other options are incorrect:** * **B) A work boat:** Work boats (vessels constrained by their draft or engaged in dredging/underwater operations) use specific masthead, sidelights, and all-round lights (red, white, or green), but they do not use a flashing blue light as a standard indication of their work status. * **C) A vessel engaged in a race:** Vessels engaged in a race generally follow standard lighting rules unless an exception is made in the rules for racing vessels (which is not signaled by a flashing blue light). Racing vessels are typically highly maneuverable and rely on standard lights. * **D) A vessel transferring hazardous cargo:** Vessels handling dangerous goods (such as barges or tankers) follow standard navigation lighting rules. There is no specific requirement or allowance in the Rules for them to display a flashing blue light to indicate the transfer of hazardous cargo.