RedactedNarrative: V1 with a single occupant on board was in reverse at slow speed.  The operator turned the motor to port.  The port stern gunwale dipped below the water and the vessel took on water and capsized.  The operator was safely recovered.
  
  Operator turned the motor in order to turn to port.  He was also sitting at the port stern right near the motor.
  
  Once Operator was approximately 15 feet from the dock, he gave his motor power in order to turn to port, I observed the vessel accelerate and push the stern port side of the vessel under water.  The vessel immediately took on water and capsized.  Operator fell into the water and treaded water near his boat. I immediately jumped onto a good samaritan's vessel with the good samaritan and we provided a throwable to Operator, who then swam to the dock and was helped out of the water by a bystander.  We then pulled his vessel to the boat ramp and righted and recovered the vessel.
  
  Operator had no injuries and required no medical attention.  I asked him what had happened, and he corroborated my observations.  He stated that he had been having problems with the throttle getting stuck, and it had occurred and he was unable to turn the throttle down, which caused the extra thrust which capsized his vessel.  
  
  During my inspection of the vessel I saw that it was seaworthy and had no leaks. The motor was completely submerged and inoperable.  I estimated repairs to the motor to be approximately $3000.
  