Michigan Compiled Laws, Chapter 324. Natural Resources and Environmental Protection § 324.80155

Sec. 80155. Any person diving or submerging in any of the waters of this state with the aid of a diving suit or other mechanical diving device shall place a buoy or boat in the water at or near the point of submergence. The buoy or boat shall bear a red flag not less than 14 inches by 16 inches with a 3 1/2 inch white stripe running from 1 upper corner to a diagonal lower corner. The flag shall be in place only while actual diving operations are in progress. A vessel shall not be operated within 200 feet of a buoyed diver's flag unless it is involved in tendering the diving operation. A person diving shall stay within a surface area of 100 feet of the diver's flag.