Lifeboats and helicopters are searching the Dorset coastline to look for a man feared overboard
Portland Coastguard received a mayday call on Friday afternoon.
Lifeboats from Poole and Swanage RNLI launched at 16:20 BST, and a coastguard rescue helicopter is also working with the lifeboats.
The lifeboats and helicopter are patrolling Poole Bay, Poole Harbour and its approaches in their search for the man in difficulties.