RedactedNarrative: UNIT 1 WAS TRAVELING NORTH ON THE WACCAMAW RIVER.  UNIT 2 WAS TRAVELING SOUTH.  THE OPERATOR OF UNIT 2 WAS INEXPERIENCED AND UNFAMILIAR WITH THE RIVER.  THESE FACTORS AND THE SPEED OF UNIT 2 CREATED A SITUATION THAT REQUIRED EVASIVE ACTION.  UNIT 2 STRUCK UNIT 1 ON THE PORT STERN.  THERE WERE NO INJURIES.