What is the fastest way to get money in Assassin's Creed Black Flag?

There are 5 best ways to get money as fast as possible. 5. The mobile app can be used to create a fleet. The naval combat in the game is connected to the companion mobile app. There are four. Find buried treasure. 2.) The complete Assassin contracts. There are two things. Whales are hunted. 2.) There is naval combat.