Missouri Revised Statutes Title XIX. Motor Vehicles, Watercraft and Aviation § 306.217. Scuba diver's marker, flag required--flag described--boats to avoid--penalty

1. Persons engaged in the aquatic sports known as skin or scuba diving shall mark their general location within or under the water with a red flag with a diagonal white bar to be displayed on the water or from a boat or raft in the vicinity of the diver's location. All diving shall be within a fifty-yard radius of said flag. No warning flag shall be placed as to impede the normal flow of motorboat traffic.

2. No boat operator shall knowingly operate within fifty yards of such flag.

3. The water patrol division shall prescribe and define the size and method of locating the warning flag mentioned in subsection 1 of this section.

4. Any person who violates subsection 1 or 2 of this section is guilty of a misdemeanor and, upon conviction, shall be punished as provided by law.