Pyxis

Pyxis, "The Compass" (ピクシス Pikushisu) is one of the Silver Keys' Celestial Spirit that is owned by Lucy Heartfilia. Pyxis has the ability to tell directional references. When it does this, the compass on top of its head spins until it stops and Pyxis points the way with both of its wings.

(Source: Fairy Tail Wiki)