Geocaching as a gentle digital sport

The Medium in today's Sunday Times Magazine is a feature on the GPS-based sport of geocaching. While the author, Virginia Heffernan, seemed a bit puzzled at first she also clearly warmed to the activity, which involves using a handheld GPS unit to guide you to a hidden treasure. By the end she calls it "sweet" and likened it to an "earnest guidebook to life on Earth." But there is no mention of how new GPS tools, like GPS-enabled phones, are being used.