The Handbook of Michigan Boating Laws and Responsibilities
The Official Boating Handbook of the Michigan Department of Natural Resources - Web Version
Table of Contents
Scuba divers or snorkelers must display a diver-down flag to mark their diving area.
Divers must stay within 100 feet of the vertical position of their diver-down flag.
Vessels must remain at least 200 feet away from the flag.
A rectangular red flag, at least 14 inches x 16 inches with a 3 1/2" white diagonal stripe, is required on Michigan state waters.
A blue and white International Code Flag A (or Alfa flag) is required on federally controlled waters.