Use a text editor to edit the "characters_init.c" file in the directory:
"\playlogic\age of pirates - caribbean tales\program\characters".

 Change the line: 

 ch.Ship.Type = GenerateShip(Ship_name) 

Note: You must be careful because the game has the same line for the female player.
Scroll to find it. Also, to find ship names open the "ships_init.c" file with a text
editor. Scroll down and you will find a complete list with everything about the ships.