In which Sea Area must a compulsory vessel carry either INMARSAT or HF SITOR equipment?

Correct Answer: Option D — This equipment partially satisfies the carriage requirement for vessels operating in Sea Area A3.

SOLAS Sea Area A3 mandates continuous alerting capabilities via Inmarsat or HF radiotelex (SITOR); therefore, carrying either Inmarsat or HF SITOR partially satisfies the stringent oceanic communication and carriage requirements for Sea Area A3.