Mark Wilcoxson, right, uses an application on a smartphone while demonstrating geocaching with his wife, Lynn, rear right, and Ronnie, rear center, and Paula Clapp, all of Sellersburg, at Vissing Park in Jeffersonville on Monday evening. There are about half a dozen caches in the park, which is just a fraction of around 2.5 million hidden worldwide that millions of geocachers like the Wilcoxsons and Clapps hunt, hide and maintain. Staff photo by Christopher Fryer