RedactedNarrative: Vessel 1 was  traveling east at 20 knots and Vessel 2 was traveling southeast approaching a powerboat crossing situation.  Vessel 2 slowed down and shifted to neutral to switch operators.  Vessel 1 maintained course and speed.  Vessel 2 shifted vessel into forward and was plowing. Operator of vessel 2 did not maintain a proper lookout and continued in the path of vessel 1.  Vessel 1 quickly turned to starboard attempting to avoid a collision.  Vessel 1 struck vessel 2 and occupants of both vessels fell down inside the vessel.  Vessels were driven to Yacht Club and occupant 2 on Vessel 1 was transported to Lake West Hospital. None of the occupants of either vessel were wearing PFD's.  Operator of vessel 2 was cited for improper lookout.