Lost Person Locator: Locating Missing Persons in Wilderness, Rural, and Urban Locations [open pdf - 113KB]
"The Department of Homeland Security Science and Technology Directorate (S&T), along with dbS Productions--known as the leading source of search and rescue research, publications, and training--has initiated a program to develop guidance, protocols and strategies responders can employ while searching for lost individuals. Called the Lost Person Locator, these guidelines and data sets will be readily available in an easy-to-follow format. First responders in the field will be able to use the Lost Person Locator software to quickly and safely locate missing people."
U.S. Department of Homeland Security: https://www.dhs.gov/