RedactedNarrative: V1 WAS TRAVALING WEST FROM 18TH AVE. CHANNEL TWOARDS THE ICW. THE OPERATOR OBSERVED  A GROUP OF MANATEES BREACH THE WATER OFF OF HIS STARBOARD BOW. IN ATTEMPT TO MANEUVER AWAY FROM MANATEES THE OPERATOR TURNED HARD TO PORT. THE OPERATOR MISSED THE MANATEES BUT WAS UNABLE TO AVOID COLLISION WITH SSMW/RESUME NORMAL OPERATION SIGN. OPERATOR TEN RETURNED HIS VESSEL TO HIS RESADENCE AND CALLED LAW ENFOURCEMENT.