S.C. Code Ann. § 50-21-175
The operator and crew of any watercraft operating in state waters are required to heave to when signaled or hailed, and allow boarding, and cooperate with department personnel, law enforcement officers, or U.S. Coast Guard personnel. The operator or crew members, or both, of any watercraft violating this section is guilty of a misdemeanor and, upon conviction, must be fined not less than five hundred dollars nor more than two thousand five hundred dollars or imprisoned for not more than thirty days.