South Dakota Dive Flags
Rules for SD divers and boaters
According to research done by Tom Holtey of Top Kayaker:
For Divers in South Dakota
8" x 10" diver down flag required. Divers to stay within 75': "Divers shall perform the activity within an imaginary cylinder extending downward from an imaginary circle formed on the surface of the body of water by revolving a 75' radius 360 degrees about a point marked by the flag."
For Boaters in South Dakota
Other boaters must keep distance of 75': "No watercraft under power w/ an internal combustion engine may be operated within the surface area as described ... above (75') nor may any water-skiing ... or other surface activity potentially dangerous to the diver be performed in the area described by the circle, except when the craft or activity are a part of ... the diving activity."
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P.S. The information above was as complete and up-to-date at the time as I could make it. It should not be construed as providing legal advice. You should conduct your own legal research or contact an attorney.