Marcellus Cadd signing his name in Round Rock, Texas, after finding a cache in all 254 counties in the state. Gary Slinkard hide caption
His phone told him he was 20 feet from an object he was honing in on using GPS coordinates. He walked over to a bank of electrical meters on a building, got down on one knee, and started feeling underneath.
"Holy crap, I found it!" he said as he pulled out a small metallic container. Inside was a plastic bag with a paper log. Cadd signed it with his geocaching handle, "Atreides was here."
Cadd is one of more than 1.6 million active geocachers in the United States, according to Groundspeak, Inc., which supports the geocaching community and runs one of the main apps geocachers use.
Every day for the past three years, he has taken part in what is essentially a high tech treasure hunt. It's a volunteer-run game: some people hide the caches, other people find them.