Shenandoah National Park -- Rangers continue to search for 21-year-old Tyler Keefer, who is from the Front Royal area.
He was reported missing at noon on Monday.
His bicycle was last seen at the Dickey Ridge Trailhead at the north end of the park. It was discovered by his mother.
Rangers are searching deep in the bushes.
"This (wooden stick) is to help me clear brush out of my way and help me make my way through the briers and the brambles and a lot of the area that we search is very thick," said William Cardwell, a Shenandoah National Park Ranger.
The search for Keefer began with two park rangers early Thursday morning.
"This map is a search map, it's laid out with the point last seen which is where his bicycle is located and it includes rings of one-quarter mile, one half mile," said Cardwell.
The map is especially important if rangers hope to find Keefer.
"Typically a person is located within about a quarter-mile of the point that they were last seen," said Karen Beck-Herzog, the Public Information Officer for the Shenandoah National Park.
So far, rangers say the only thing they found while searching the trails is a cigarette carton and its still not clear if it even belongs to Keefer.
They are hoping on Friday they'll have more luck when they add anywhere between 20 and 30 volunteers.
"At some point if we've completely exhausted and covered our basic search area. We'll eventually reach the point that we suspend our search and eventually make the assumption that he is somewhere in the rest of the world," said Cardwell.
If you have any information about the whereabouts of the missing hiker, call the National Park Service at 1-800-732-0911.