You have berthed in a port area with other tank vessels. What signal is displayed by a vessel to indicate it is transferring flammable or combustible liquid cargo?

Correct Answer: Option D — A red light visible all around the horizon

USCG regulations and international maritime standards require vessels transferring flammable or combustible liquid cargo to display a red signal light visible all around the horizon at night, or a red flag (Baker flag) during daylight hours.