Inshore lifeboat launched at 2256, in response to “Mayday”call from 5.5 mtr motorboat at West Cant buoy. 1 person onboard, ILB on scene at 2259, craft suffered outboard failure. ILB took the craft under tow and towed it back to its mooring at Kingsferry bridge in Swale. ILB returned to station at 0039. SW 3.