One of the world's most famous merchant captains died, having long been admired by his crew and fellow officers.

They remained puzzled, however, over a strange ritual he performed daily. While at sea he would lock himself in his cabin and open a small safe, take out an envelope with a note inside and read it. After locking the paper back in the safe, he would return to his duties.

For years this went on, and his crew became very curious.  Was it a treasure map?  Was it a letter from a long lost love?  Everyone speculated about the contents of the strange envelope.

After laying the captain's body to rest, the first mate led the entire crew back to the ship and into the captain's quarters.  He opened the safe, got the envelope and read the words aloud to an astonished crew:

'Port: Left, Starboard: Right.'