Geocaching
The sport where you are the search engine...
I have been geocaching since 2003 when I was an intern at the Audubon Center of the North Woods, along with Liz Pomper. She heard a radio report about geocaching on NPR one day, and knowing that we had an GPS receiver available at the center, asked me if I would try it with her.
As to this day Team ItTakesTwo has found around 80 geocaches, for which I have prepared a map.