Entangled Coins
Two intricately-engraved gold coins that are readily distinguishable from normal currency of any kind, but are identical to one another. They are linked together with magic to always point the holder to the other coin.
Mechanics & Inner Workings
If one coin is held and focused on as a full-round action, the holder can understand the direction and rough distance of the other coin, as long as the two coins are in the same realm.