RedactedNarrative: OPERATOR 1 WAS OPERATING VESSEL 1 WHILE TRAVELING AT IDLE SPEED WHILE PERFORMING A DOCKING MANEUVER. VESSEL 2 WAS DOCKED IN A SLIP AND UNOCCUPIED. AS VESSEL 1 WAS LEAVING THE DOCK, OPERATOR 1 HEARD A LOUD POP WHEN SHIFTING THE GEAR. VESSEL 1 STRUCK VESSEL 2 DUE TO A MECHANICAL FAILURE IN THE SHIFTING MECHANISM OF VESSEL 1. THERE WAS NO INJURIES WITH ANY OF THE OCCUPANTS ON VESSEL 1. THERE WAS MINOR DAMAGE TO VESSEL 1 AND VESSEL 2 SUSTAINED A CHIP TO THE LOWER UNIT SKEG.