Vessels operating in which sea area(s) are required to carry either Inmarsat or HF equipment or a combination thereof under GMDSS?

Correct Answer: Option B — A3

Sea Area A3 requires vessels to maintain continuous alerting capabilities beyond VHF and MF range. This is achieved by carrying either Inmarsat satellite equipment or HF radio installations. These systems provide the necessary long-range communication links to ensure distress alerts reach rescue coordination centers when outside terrestrial radio coverage.