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?
• 33 CFR Part 155 – Oil or hazardous material transfer operations and the associated signal requirements • The difference between anchor/anchor watch lights and cargo transfer signals • Why signals for dangerous cargo operations must be visible all around the horizon and easily recognized at night
• Think about what kind of light or signal would clearly warn nearby vessels that dangerous cargo transfer is in progress, especially at night. • Recall which color of light is commonly associated with danger, stop, or restricted operations in maritime practice. • Ask yourself which options could be confused with other standard navigation lights, and which one is specifically suited to mark a hazardous operation alongside a pier.
• Verify in 33 CFR or your study materials what light a tanker displays during transfer of flammable or combustible cargo alongside a dock. • Confirm that the signal must be visible all around the horizon and not easily mistaken for a normal navigation or anchor light. • Eliminate any choices that describe signals not typically used in COLREGS or U.S. port practice for indicating hazardous cargo transfer.
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