Wyoming law requires that scuba divers or snorkelers display a diver-down flag to mark their diving area. The flag may be displayed only while a person is diving or snorkeling. Vessel operators must not operate within 100 feet of a displayed diver-down flag.
A diver-down flag may be displayed only while a person is diving or snorkeling. Also, scuba divers and snorkelers should not place a flag in an area already occupied by other boaters or where their diving operation will impede the normal flow of waterway traffic.
Two types of flags are used to indicate diving activity.
Divers Flag: This is a rectangular red flag, at least 12 x 12 inches, with a white diagonal stripe. This flag must be displayed at least three feet above the surface of the water.
Alfa Flag: A blue-and-white International Code Flag A (or Alfa flag), at least 3.3 feet (one meter) high and visible from all directions, must be displayed on vessels on federally controlled waters. This flag indicates that the vessel is involved in a diving activity.