To make some extra money in Assassin's Creed III Liberation, you can buy ships and then fill them with goods to send to destinations across the area.
To use the trading screen, press the left icon to set the destination of the ship. You do this by picking the port that you want to send the ship to.
The middle icon allows you to buy or sell goods and ships.
The right hand icon lets you check on the status of all of your ships.
Probably the best thing to trade is to buy rum from Havana and send it to Natchez as this avoids the risk of pirates and earns you a nice profit.
Added by: MongooseGeneral Jan 3rd 2013, ID#71