anyone contemplating a hydrostatic-release should read the literature about at what pressure they are designed to release. Mine was designed to release several meters below water
(in other words, after I've sunk the boat and it's gone under).
I decided not to use the "float free" hydrostatic-release bracket. (My boat is an unsinkable multihull
design that could have it hulls flooded but would never reach the depths needed to trigger release.) I keep it on a shelf, and it would float if we ever capsize