Emergency services were called to a Wightlink ferry on Friday (January 31) after a man died during the a Yarmouth to Lymington crossing.
Police were called at 12.45pm on to a report of a sudden death of the man.
Officers attended the ferry terminal in Lymington, as well as colleagues from the ambulance service, and a man in his 80s was pronounced deceased.
A file will be prepared for the coroner.
The man’s next of kin have been notified.