RedactedNarrative: UNIT 1 WAS TRAVELING AT A HIGH RATE OF SPEED ON THE PORT OF UNIT 2.  BOTH UNITS WERE HEADED IN THE SAME DIRECTION.  UNIT 1 SUDDENLY MADE A RIGHT TURN AND STOPPED.  UNIT 2 NEVER CHANGED COURSE OR SPEED AND STRUCK UNIT 1 ON THE STARBOARD.  THERE WERE NO INJURIES AND BOTH VESSELS SUSTAINED DAMAGE.