Yep. The GPS will get you within 50 to 100 feet and from there on you have to start turning over rocks and looking under piles of stuff. The first one I found was a "book exchange" - literally a box of paperback books hidden out in the woods. The second one was a box of military items (patches, buttons). The concept is to take something and leave something.
Find #1
Find #2
Find #1
Find #2