At 1430hrs a boat at Kohi Pt saw a jetski with no sign of the rider.  The jetski appeared to be at anchor.  At 1438hrs a person was spotted in the water and taken on board and the jetski taken in tow.  The jetski had broken down and the man was swimming to shore.  Weather conditions were good with a 9-13 kts wind from the WSW and no significant swell.  Both boat and jetski arrived safely back in the harbour at 1555hrs.  A big thank you to the Good Samaritan.