So I'm over here training my nautical levels as I always do, and then it occurs to me that I have no idea what I'm getting per level! What do I get for nautical levels? Gold? Experience? Ship gear choices?
From what I have seen, you can get and use better Cannons at the very least. Bronze Cannons are Nautical Level (NL) 5 and Iron Cannons are NL 8. There are probably other things that I haven't found yet or already had enough experience (ship equipment to use on your ship).