Unit 1 was being operated by subject 1 while unit 2 was being operated by subject 2. Unit 2 was also occupied by a passenger who was located behind subject 2 on the rear seat. According to the statements provided subject 1 and subject 3 each were operating a PWC behind a boat being operated by boat operator 1. These watercraft were members of the same party and in a triangle pattern heading in a northerly direction in Mackay Creek. As this group was traveling towards the Hwy 278 bridge, members of the group noticed a white/gray PWC occupied by 2 men going in the opposite direction. The white/gray PWC was occupied by subject 2 and passenger. After approximately several minutes, boat operator 1 headed towards the floating dock to begin docking. subject 3, who was on boat operator 1's portside and to the rear began to come around boat operator 1's vessel in order to dock as well. During this time unit 2 had turned around and began to follow the boat and the two PWC's. According to subject 2's statement he began slowing down while approaching the docking area and did not see the PWC being operated by subject 1, who had made a left turn in an attempt to go aroung boat operator 1's  portside and also dock. subject 1 stated to officer that he did not see the PWC being operated by subject 2 while changing course and ultimately collided with subject 2 knocking passenger from Unit 2 and subject 1 from Unit 1. The operator of the PWC accompanying subject 1, subject 3, returned to the scene. subject 3 jumped into the water and assisted passenger and subject 1. subject 3 kept the injured individuals who appeared to be unconscious, from sustaining further injuries and keeping their heads above water. subject 3 assisted with getting both individuals out of the water ans assessing their injuries. Based on both statements received and the nature and location of the damages sustained by the PWC's it is officer's opinion that the operators subject 2 and subject 1 were both responsible for the collision by Failure to Maintain Proper Lookout.