Matt Murphy programmed the coordinates for the Just a Swingin' cache into his hand-held global positioning system and navigated his way along a paved Portneuf Greenway trail, accompanied by his two young children. After crossing a wooden-planked, swinging bridge, he handed the device to his 7-year-old son, Rowan, who began to count down the number of feet remaining to where a yellow symbol marked the spot on the 3-inch digital screen. When they reached their destination, Matt stopped, reached down, and stuck his hand into a pile of lava rocks along the sloping bank. He felt around for a moment before pulling out a green, military ammunition box with SEIGO stenciled in white letters on one side.

For the rest of this story, see Sunday's Idaho State Journal