RedactedNarrative: Subject was operating Vessel 1 at approximately 30MPH in a canal.  Vessel 1 was a 21ft fiberglass center console boat carrying 5 persons on board.  The operator observed a wooden dock in his path of navigation.  Upon approaching the wooden dock, the operator tried to turn the steering wheel of Vessel 1 to avoid collision with the dock.  The operator stated that the steering malfunctioned(locked up) and was unable to turn.  With the steering unable to turn the operator collided Vessel 1 head on with the wooden dock.  This caused major fiberglass damage to the bow of Vessel 1.  As a result of the collision, all 5 subjects on board were injured to some level.  No one received immediate medical attention.  There were no serious bodily injuries reported.  The operator and passengers were going to monitor their conditions and go to the hospital or doctor if need be. Three subjects required medical attention in the days following the incident. It was determined that the operator of Vessel 1 was operating at an estimated speed of 30 MPH through a posted "No Wake Zone."  PFD's were used and drugs or alcohol was not a factor in the incident.