Inshore lifeboat launched at 1613 to report of jet Ski broken down off Minster. ILB arrived on scene at 1623, Jet Ski had drifted into shallow water and was towing small rubber ring. Four persons with casualty, ILB recovered the persons and took them back to the shingle bank at Minster, then returned and recovered the jet Ski, towing it back to shore. The ILB was released and returned to station at 1723, being ready for service at 1744. SW 1.