S.C. Code Ann. § 54-15-280

No person shall be authorized or permitted to conduct and pilot any vessel, except those excepted in Section 54-15-270, over the bar, into, out of, or within the harbor of any port, unless the person shall be a then currently licensed pilot and no branch pilot shall be authorized to pilot any vessel with a deeper draft of water than his branch. Any person prohibited from pilotage who shall presume to pilot vessels in violation of this prohibition, shall be entitled to no fee, gratuity, or reward for so doing, shall pay the regular pilotage to the group of associated licensed pilots in the port and shall be subject to a fine of five hundred dollars or imprisonment for not more than thirty days. This prohibition shall not prevent any person from assisting any vessel in distress, provided the person shall deliver up the vessel to the first licensed pilot who shall offer to board.