David Cofer spends his weekends climbing 1,000 feet through a storm drain and out a manhole-all in the name of geocaching.

This Saturday, Outdoor Chattanooga hosts Geocaching 101, a free public workshop designed to introduce a hobby that brings treasure hunting into the 21st century and connects people locally and globally, all with a few simple coordinates.

The workshop will be held at the organization’s Coolidge Park office, located at 200 River St., and will run from 10 a.m. to noon.

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“It’s a very accessible, inexpensive way to get people outdoors,” said Ruth Thompson, marketing and events coordinator for Outdoor Chattanooga. “That’s our main mission.”

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Geocaching explained in two minutes