RedactedNarrative: Vessel #1 was heading in a westerly direction out of Boston Inner Harbor towards Long Island Bridge to Quincy Yacht Club.  He was looking in the direction of where Long Island Bridge use to be to attempt to gain his bearing.  All of a sudden he saw a green running light of another vessel and put his vessel in full reverse but collided with vessel #2.  Vessel #2 was headed in a south westerly direction from Winthrop Harbor headed to Dorchester Yacht Club.  He saw vessel #1 operating with no navigational lights on at approximately 50-75 yards off his starboard side at a high rate of speed.  He sounded his horn to signal the other vessel.  He also stated he took measures to avoid collision.  Operator of vessel #1 was given a warning for failure to keep proper lookout and failure to avoid collision.  Operator of vessel #2 was given a warning for failure to give way.  Cause of accident was improper lookout, excessive speed, inadequate on-board navigational lights and operator inattention.