16,000 Things to Do With GPS

"But a couple of years later, as GPS devices and digital cameras became both cheaper and more widely available, the site began to draw attention. Slowly, people who'd never met Jarrett began to add their photos and travel stories. Today, more than 4,400 GPS-toting travelers have participated in the Degree Confluence Project, covering nearly all the easily accessible points in the United States and Western Europe, and putting a sizeable dent into other populated portions of the globe."