compasses are not "usable" in that normal or traditional sense
I forgot to mention last time that while in the overworld the SELECT button must be pressed instead of the START button to view the whole overworld map and move the arrow pointer to the area or areas where the completed or beaten shrines were located; if & when the compasses of the beaten shrines were collected and you press SELECT to view the OW map, the game will ask you if you want to warp to the location of the completed shrine; that is the only way compasses are "usable" - without them, you cannot "warp" to such areas on the overworld map
