Question 62 RVR04 - Master or Mate of LT 200 GRT

The Correct Answer is C **Explanation for Option C ("One red light")** Option C is correct because regulations governing the transfer of flammable materials (bunkering) require a specific warning signal to be displayed at night. When transferring fuel, particularly in port or at a dock, the operation is considered hazardous. A single, steady **red light** displayed where it is clearly visible is the universally recognized warning signal in port regulations (often mandated by local port authorities or the Captain of the Port) signifying that flammable liquids are being handled or transferred, and that passing vessels or personnel must proceed with extreme caution or stop entirely. *** **Explanation of Incorrect Options** **A) Two red lights:** Two vertical red lights is the recognized signal under the International Regulations for Preventing Collisions at Sea (COLREGs) and Inland Rules for a vessel that is "Not Under Command" (NUC)—meaning it is unable to maneuver as required by the rules. It is not the standard warning signal for bunkering operations. **B) One red light over a yellow light:** This configuration does not correspond to any standard, defined navigational or operational warning signal related to bunkering or hazardous transfers under maritime rules (COLREGs or standard port safety regulations). **D) One red light over a white light:** This is the specific signal displayed by a vessel engaged in **Piloting Duty** (a pilot vessel). While it is a recognized configuration under COLREGs, it signifies the vessel is carrying a pilot and does not indicate hazardous fuel transfer operations.