RedactedNarrative: Operator of V1 (41ft Viking) engaged his port throttle in reverse which caused his vessel to reverse and spin to it's starboard. This caused V1 to collide with a marina piling and proceeded to hit V2 (45ft Prestige), which was stationary and docked.
  
  Operator1 was in operation of V1 and was in control of the helm and throttle located at the top deck of the vessel. Subject1 was standing at the rear lower deck of V1, and Subject2 and Subject3 were located inside the cabin of V1. 
  
  Operator1 was in the process of disembarking from his wet slip (slip 20) at Fisherman's Wharf Marina. Both port lines were removed and untied from the piling with the starboard lines still tied to one piling. Operator1 started to see his vessel bow drift towards V2 so he put his port transmission engine throttle in reverse. Operator1 advised the vessel went in reverse at a higher RPM than expected, which caused V1's starboard stern to hit a piling and V2's starboard bow which was docked at slip 18.
  