RedactedNarrative: V1 WAS WESTBOUND IN THE WINCHESTER CANAL. V2 WAS TRAVELING SOUTHBOUND IN A SLOUGH THAT T'S INTO THE WINCHESTER CANAL.  V2 FAILED TO YIELD AS IT ENTERED THE CANAL AND SIDE SWIPED V1.  THE IMPACT KNOCKED THE TILLER HANDLE OUT OF V1 OPERATOR'S HAND AND V1 CONTINUED ONTO THE BANK ON THE SOUTH SIDE OF THE CANAL.  V2 FAILED TO STOP.  V1 OPERATOR DESCRIBED V2 AS A TAN HAVOC VESSEL WITH A 50 HP YAMAHA MOTOR.  V2 HAS NOT BEEN LOCATED.