RedactedNarrative: Vessel 1 operating in channel west of Rock Lake.  Operator was traveling between 10-13 mph.  Vessel 1 all of a sudden took a hard left-hand turn and accelerated into the metal retaining wall.  When Vessel 1 struck the wall, the Operator was ejected to the port-side and struck his head and left elbow area.  Operator was able to get back onto the Vessel and returned it to his pier.  Operator went to the hospital and received stiches in his elbow area and stables in his head.  Officer talked with the technican where the Vessel was taken for inspection and repairs, and there did not appear to be an apparent reason for the possible mechanical/electrical malfunction.