From what I understand regarding the adult supervision, the intent is to require the adult to be IN THE SAME VESSEL as the minor operator.
This kind of pokes youth sailing in the eye. So the 17 year old pair of sailors in an F-18 would have to be supervised by an adult.
please read this bill....
http://www.flsenate.gov/Session/Bill/2017/1227/BillText/Filed/PDF It is targeting use in salt water
children under 16
and it does not require anything more than (sober) supervision (you don't have to sit in the hobie bravo with your 15 year old)
