The inshore lifeboat was launched to a report of a yacht running along the ashore and drifting towards the harbour arm at Shoreham.
The man on board was also shouting for help. The lifeboat reached the 21ft boat, which had suffered engine failure and a crew member went aboard. The casualty was in distress so he was taken off and put aboard the lifeboat and taken back to the lifeboat station, where he was checked over by the crew.
Meanwhile the all weather lifeboat launched to get the yacht under tow.