The Manxman's had to return to Douglas because of a medical emergency on board.
A spokesperson for the Steam Packet said it was quicker for the ferry to turn around and come back to port in this situation.
The Manxman left Douglas at 7.55am this morning, Tuesday, December 16, bound for Heysham.
The company said an update on the incident would follow.
Deadline looms for by-election nominations
Biker in UK hospital after Mountain crash
Trial event closes roads in Peel and Ramsey
Castletown police station could be yours... for £250,000
Brewery advertising for operator for landmark Laxey pub
Hospice cafe reopens next week after refurb
Another one bites the gust - as Ramsey rocks cancelled
Mountain Road closed again after crash