The Box of the Wanderer
Follow the waypoints given. To enter to the convent, at 30m of the main gate, take a path to your left and always walk near the convent wall. The entrance is a ruined small wall. When you enter the place, go East side of the convent. When you found the most eastern room, that's the GZ.
The place has poor satellite signal so the GZ was taken from Google Earth. If you have trouble getting signal, remember: always go in East direction and find a room with a "bathtub". Have fun and good luck