Pennsylvania Dive Flags
Rules for PA divers and boaters
According to research done by Tom Holtey of Top Kayaker:
For Divers in Pennsylvania
14" x 14" diver down flag "displayed in the water on a buoy, whether a boat is present or not." A boat shall display the alpha flag, 1 meter square, while it is restricted in its ability to maneuver due to diving operations. Restricted in its ability to maneuver means that divers are attached to a boat by some physical means. Federal regulations may apply to Great Lakes and/or international waters.
For Boaters in Pennsylvania
Boats not engaged in the diving operations shall remain at least 100' form displayed flag(s).
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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.