RedactedNarrative: Vessel 1 was at anchor in a speed zone; Vessel 2 came from behind Vessel 1 with the intention of switching passengers between the two vessels.  Vessel 2 was travelling too fast while attempting to come alongside Vessel 1.  The Operator of Vessel 2 let off the throttle making it impossible to steer Vessel 2 and contributing to Vessel 2 striking Vessel 1 in the aft starboard side.