Personally I wouldn't be taking a carbon plate anywhere near water.
@Yellowdog Some precautions for you
The outer layer of the plate is glass fibre used as an abrasion protection. Take care that you webbing straps don't abrade through this layer, otherwise you'll get water ingress and possible delamination of the carbon layers. For the same reason protect teh plate from scuffs and scratches that penetrate teh glass layer
Metla, Carbon and water make a battery. If you can't' isolate the metal components keep an eye out for corrosion
While strong in (depending on the direction of the layup) carbon fibre composites (CFC) are easily susceptible to impact damage. If say you dropped a metal ball on the plate, the impact side might just show a small depression (a compression force) the rear side however might splinter and delaminate because CFC doesn't' like a tensile force
While light and strong keep in mind that it's more fragile than a metal plate with regard to damage tolerance.