Let's not forget the tragic loss of the Grand Commander VH-WJC on the 17th July 1983.
One person in water sighted by numerous aircraft; deficiencies in SAR Ops led to the loss of this life.
Life jacket training is very important.
I know of one biz-jet operator; Gulfstream.. where the owner and his entire family has done the water swim etc at the QF facility in Sydney. Money well spent!