UNIT 1 WAS COMING BACK FROM SHRIMPING IN THE CHARLESTON HARBOR HEADING TO THE WAPPOO BOAT LANDING. MARKER 4 IN THE WAPPOO CUT WAS LEANING BACK MAKING THE REFLECTIVE TRIANGLE HARD TO SEE. UNIT 1 SAW MARKER AND THE LAST MINUTE AD TURNED HARD TO THE RIGHT HITTING THE MARKER ON THE PORT SIDE OF THE VESSEL. DAMAGE OCCURED TO THE FIBERGLASS AND GELCOAST ON THE CAP AND HALL STARTING ABOUT 2 INCHES FROM THE BOW. DAMAGE IS ABOUT 3 FEET LONG ON THE PORT SIDE OF THE VESSEL.