Compass of Desires (5e Equipment)
From D&D Wiki
Wondrous Item, very rare
A small sphere of glass, fit with a gyroscopic needle which always seems to point up.
When a holder says aloud the name of something, if this item is on their current plane of existence, the needle will point in the exact direction of what they are seeking. If whatever they are seeking is behind a 5 foot thick barrier of some sort, the needle will not point towards it.