The reason why Turner has to stay at sea for 10 years at a time is because by the end of Pirates of the Caribbean: At World's End, he takes over Davy Jones' job as the captain of the Flying Dutchman.
FORGOTTEN HISTORY on MSN5d
The REAL story - Pirate Davy Jones
Whether through the old legend itself or maybe through the immensely popular movie series The Pirates of the Caribbean, you've probably heard of Davy Jones, his ship the flying Dutchman and his famous ...
After losing Jack Sparrow to the locker of Davy Jones, the team of Will Turner, Elizabeth Swan and Captain Barbossa make their final alliances with the pirate world to take on the forces of Lord ...