S.C. Code Ann. § 50-23-360

The owner shall paint on or attach to each side of the forward half of the vessel the identification number in such a manner as may be prescribed by rules and regulations of the department; in order that it may be clearly visible the number shall be maintained in legible condition. No number other than the number validly assigned to a vessel shall be painted, attached or otherwise displayed on each side of the forward half of such vessel. Only one valid number may be displayed at any time.