A search and rescue helicopter was sent to airlift a casualty from a Northlink ferry off the coast of Peterhead.
Aberdeen Coastguards were called shortly before 6pm to evacuate a casualty from the Northlink ferry Hjaltland during its sailing to Shetland.
A spokesman confirmed the search and rescue helicopter Bond 1 was sent to assist.
He said the coastguard team arrived at Aberdeen Royal Infirmary with the casualty at around 8.30pm.
The casualty’s condition is not known.