the.com/geocaching

means A recreational outdoor activity where participants use GPS coordinates to find hidden containers, called caches, and sign a logbook to prove they found them.

from A modern compound born with the technology it depends on: 'geo-' from the Greek 'gē' (earth), the same root behind geography and geology, fused with 'caching' from 'cache' — a hiding place, borrowed from French 'cacher' (to hide). The hobby itself sprang up around the year 2000, when the U.S. government stopped deliberately degrading civilian GPS signals; suddenly handheld receivers were accurate enough to find a small box in the woods, and an enthusiast hid the first cache to celebrate, posting its coordinates online. The word was coined to name the game almost immediately after.