For those who knew how to use it, the compass was the key to everything. Jack Sparrow's compass was an unusual navigational instrument most notably used by Captain Jack Sparrow, having previously been bartered from the voodoo mystic Tia Dalma and inherited from Captain Morgan.
'It points to the thing you want most in this world.' ― Jack Sparrow and Elizabeth Swann ' True enough, this compass does not point north.'