There's a lower tech cousin for those of us who can't bother to go out and buy a GPS (and won't go get a smartphone either
)- letterboxing
I had no idea what this was, but it's one of the new Brownie Girl Scout badges. No treasures, per se. The box has a stamp and a pad in it- you stamp in your log book, and use your own stamp to mark in the box's log book.
Rather than GPS coodinates, you follow written clues and sometimes compass headings.
Seeing the mass of stamps and ink pads I still own, I'm excited to take my DD and my other girls on a hunt this summer. And then next summer we may try the Junior Geocaching badge (also a new badge with the new Handbooks)