It's the Law: Before Going Out

Diver-Down Flags IC 14-15-9

Indiana law requires that scuba divers or snorkelers display a diver-down flag to mark the diving area. The diver must stay within 100 feet of the flag. Boats must stay at least 150 feet away from the flag unless directly involved in supporting the diver.
Two types of flags are used to indicate diving activity.

Divers Flag

A rectangular red flag, at least 12 x 12 inches, with a white diagonal stripe is used to indicate the presence of a submerged diver in the area. Indiana law requires that divers display this flag prominently and stay within 100 feet of the flag.

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 boats on federal waters whenever these boats are restricted in their ability to maneuver by the diving operation.

Indiana Department of
Natural Resources

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Online boating safety handbook last modified: May 9, 2008
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