Four lifeboats and a helicopter went to the aid of a crew member with chest pains on board a yacht.
Largs lifeboat was launched on Monday 22 October in response to the emergency call.
Rothesay Coastguard Rescue Team helped co-ordinate the operation, with Coastguard Rescue Helicopter 199 also called into action.
Lifeboats from Arran , Tighnabruaich, and Troon also assisted.
The chopper was first on scene and located the casualty yacht one mile south of Inchmarnock, west of Bute.
This was soon followed by Largs lifeboat who put two crew members on board to carry out casualty care.
Largs RNLI spokesman Alasdair Woods said: "After initial assessment and treatment it was deemed necessary to transfer the casualty to further care as soon as possible.
Due to the prevailing conditions a winch to the helicopter was considered to be too dangerous, for this reason the casualty was transferred to the lifeboat before being taken ashore to a nearby beach where the helicopter had already landed.
"The lifeboat was beached to enable a quick transfer of the casualty to the care of the helicopter crew assisted by Rothesay Coastguard Rescue Team."
"With the assistance of Arran lifeboat, Largs lifeboat was re-floated and returned to the casualty vessel who were experiencing engine troubles."
The casualty vessel with the remaining three crew was taken in tow towards Tighnabruaich, during the passage the tow was handed over to the Tighnabruaich lifeboat thus setting Largs lifeboat free to return to station.
Alasdair Woods added: "The service call was carried out over a three and a half hour period and was an excellent example of all search and rescue units working together, doing what they train for.
"Everyone involved wishes the casualty well."