Oh, and @Dammit PFD - think about the kit you'll be wearing. 50 newtons of buoyancy is quickly eroded when you have a pair of boots full of water and wet kit...
Luckily bare feet, pair of shorts and a rash vest is all the kit I have on- there’s 85kg of me of course, but the more ice cream I eat the more buoyant I get (relatively).
Oh, and @Dammit PFD - think about the kit you'll be wearing. 50 newtons of buoyancy is quickly eroded when you have a pair of boots full of water and wet kit...