The Sumburgh-based coastguard helicopter was called to the rescue of two seamen in separate incidents this morning.
A sick crewman was airlifted to Clickimin from the Russian fishing trawler Kurshskaya Kosa, 54 miles east of Shetland, after a call was received at 12.08am.
The man was landed at Lerwick and then taken to the Gilbert Bain Hospital.
At 6.20am the helicopter was called to the dive support vessel Grand Canyon, 120 miles north-east of Shetland, to airlift a man with an injury to his hand. He was also taken to the hospital.
Meanwhile the Aith lifeboat came to the rescue of a 35-foot yacht which ran aground on a sand bar east of Papa Little this afternoon.
The lifeboat managed to pull the Charlotte free and returned to her station in Aith, after the call was received at 2.35pm.