"Gene Kearns" wrote in message
You've made a good point. Now, suppose that you are diving. You are
at one of the popular dive spots... a defunct NOAA tower 30 miles off
shore from Cape Fear, in the Atlantic Ocean. How would you mark your
boat to show that there were divers in the water? If you feel that a
flag is an appropriate warning, (1) is the flag, alone, sufficient and
(2) what would it look like?

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** Ah.....the old commercial diver blue/white(official?) flag vs the
recreational (familiar) red flag with the white stripe.
Out at sea I'd use the blue/white version assuming mostly 'real' sailors
would be that far out.