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Official Michigan Boating Handbook Michigan Department of Natural Resources and Environment

It's the Law: On the Water

Diver-Down Flags

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.
Rectangular red flag with a white diagonal stripe Blue and white vertically striped flag

Divers Flag

Alfa 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.

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Michigan Department
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Online boating safety handbook last modified: July 13, 2011
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