Tankerman · Transfer — Warning Signals
A vessel transferring oil in port must display, as a warning to others, by day a:
- AYellow flag; by night a green light
- BBlack ball; by night nothing
- CRed flag (or sign); by night a fixed all-round red light✓ Correct
- DWhite flag; by night a strobe
Explanation
During transfer of flammable/combustible liquid cargo, regulations require a red flag (international 'B'/Bravo) by day and a fixed all-round red light visible around the horizon by night, warning others that hazardous transfer operations are underway.
Authority: 33 CFR 156.120
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