Removing the old carpet and replacing is your option.
To replace, however you do have to remove everything off the deck
I removed everything down to the logs on my 1979 Harris Float Boat. Went with vinyl flooring. Materials (plywood, vinyl, wiring) $2500, used seating we had. Brought the value of Toon to $3500 .Agreed, the old carpet needs to be removed, but I would install vinyl in it's place. And if your fence doesn't already have 1/2" spacers between it and the floor, I'd do that while I was at it....
NonePurchased 2005 sun chaser pontoon boat which needs new carpeting. I do not want to remove old rug what are my options?