I assume you are referring to V3. V3 is 5 miles max from the shoreline
between SSI and PBI. from 7 or 8k up, that is a 5:1 glide. I fly that
route in my Maule if winds are acceptable.

I think the original poster may have been thinking V437. I don't do
that one.

jsmith wrote:
I have flown SSI to PBI.
ATC will try to get you to fly offshore if you file the shoreline route.
With each frequency change, I was given an amended clearance which I
declined. The comments section of my flight plan contained the notice
"NO OVERWATER ROUTING ACCEPTED, NO FLOATATION GEAR ON BOARD".
ATC does not get this information from FSS unless they request it.
ATC personel are not pilots and do not understand that light GA aircraft
cannot glide from offshore routes to the beach.
Do not accept an offshore amended clearance.