Assassin's Creed Pirate Sailing is a derivative game of Assassin 4 Black Flag. All the music in Pirate Sailing is intercepted from the Black Flag. I intercepted it by the method on the first floor and compared it with Black Flag's, and found that it is basically a fragment version of Black Flag OST. Black Flag sent two more OSTs, one is background music, and the other is a full version containing background music and boat songs

For the full version, please search Assassin's Creed 4: Black Flag (the complete edition). As a result, the third post bar has a connection to the mother's disk, or you can download Netease cloud music to save trouble.