12mm plywood - (Waterproof and Marine Grade)
12mm plywood is good for uses that will involve a project getting wet, such as Marine Applications and Boat Building. Marine plywood is a specially treated plywood that is designed to resist rotting in a high-moisture environment. Marine plywood is frequently used in the construction of docks and boats.
Marine ply is also going to have more plies than typical construction ply, you want to be on the look out for higher numbers, greater than 7 in my opinion. Marine ply is going to be lighter than ext ply and especially pressure treated ply. For your boat I would go with the Home Depot pressure treated varieties. Your best bet is to get 2 sheets of 3/4 pt ply, let them dry for a week, then glue them together.
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