What about rafts
Whilst the debate rages about cushions or life jackets, if your 80Km's out to sea there isnt going to be a life raft on board either, so a jacket might be a good idea.
Current CASA rules for rafts are seperated from the carriage of life jackets, so in some cases you could be floating out in the ocean hanging on to your seat cushion...............
Rafts are not needed within 400 Nm of land or SE distance from an Adequate in most Australian commercial operations now.