Unit 1 was moored at J dock at Grand Dunes marina unoccupied. Unit 2 struck the forward starboard side with his forward starboard side causing a crack and a large hole in vessel. Unit 1 is a catamaran sail boat. Unit 2 is a pontoon boat. Unit 2 left business card on Unit 1 and went home. Unit 2 was contacted approximately two and a half hours after the accident.