ok, so i built a fishing deck on my 14' aluminum boat, and put hatches in it and such.. the peice of wood that covers the hole warped in the corners, how can i fix, prevent, do w/e to make this better... will carpet just make it ok? idk, i need advice, heres a pic of it b4 it got warped, ill post a pic of it after if u need it. thanks

is the wood pressure treated or marine plywood or just standard plywood?

It appears to me that either A  you put the best side of the plywood down, or B you  used a CDX or other sheathing grade of plywood. When choosing plywood , the more plys it has the more stable it will be. Right under the white arrow in the picture appears to be a rather large knot hole in the top ply. You may be able to bolt a piece of aluminium angle to the under side and straighten it out. If it was mine, I think I would use what you have for a template and make a new one using better material.