Pirates & Diplomats is an expansion for the game Navegador. It contains of 6 cards (3 pirates and 3 diplomats). The Pirate cards allows you to rob goods from colonies if you have a ship in the sea region. With the Diplomat card you can use the colonies and overseas trading stations of another player when you sell goods on the market.
For more information: http://boardgamegeek.com/boardgameexpansion/120105/navegador-pirates-diplomats