Use the coordinate device to mark the center of the circle.

With the coordinate interface active, walk around until Grace is on top of the center of the circle from the SIDNEY map. Check your inventory to get the coordinates or jot them down from the SIDNEY interface from your hotel room. The spot should be close to the cave's entrance. When you're close, Grace will automatically draw an X in the dirt with her foot. Open up your inventory and select the shovel. Use the shovel on the X. Before you leave L'Ermitage, you can select the St. Anthony and St. Paul postcard from your inventory on the rock formation to the left of the cave. Grace compares the two. Further, select the cave, open the verb menu, and select "point" for additional information.

SIDNEY
When finished at L'Ermitage, get back on the Harley and return to Rennes-le-Chateau and your hotel room. Approach the desk in the corner and fire up SIDNEY by using the laptop. Use the ADD DATA function at the top menu bar and scan in the three postcards you purchased from the museum. Also, you can select the SEARCH function from the top menu and perform a search on Solomon from the clues you obtained at L'Ermitage.

Next: Day 3, 7:00 am, as Grace (cont.)