We use it for our searches coastal and over very large lakes!
Train in it every 3 yrs with the HUET course in Fleetwood.
God send! Makes life a lot calmer under water in the dark..gives you that extra reserve to draw on to identify any snagging hazards as you try to egress...prevents you from panicking.
2 mins full in warm water and max 30 secs cold panicking.
Strapped into a pouch on our mae west.
I know of 3 persons whose lives were saved by STASS.
Wouldnt fly over water (prolonged) without it now I suppose.