Mariner's Log

Mariner's Log is a log from a ship at sea. It seems to detail the observations of a watchman, typically those concerning a drunken sailor named Cedric.

Source
A random piece of loot found in a Bag of Fishing Treasures (Terokkar Forest) which is rewarded from completing a daily fishing quest.

Speculation
It's possible that the Cedric referred here could be Cedric Stumpel, who can be found wandering the Rogues' Quarter in Undercity.