Gathering data of geocachers/hikers/hunters/anyone who wanders around with a gps in order to develop a model of how lost people may move in the wilderness in response to terrain, vegetation, etc. Via the website http://tanglefoot.cs.byu.edu/~amy/index.html .
At this site people can upload their tracks, view them on a map, and then (still to be implemented) annotate any areas of interest and use their 20/20 hindsight to modify their path to how they would have rather gone (and how they would encourage others to go in the future).
Combine data obtained from website, models from previous studies (eg. Syrotuck), information from experienced searchers, as well as terrain, trail and vegetation information to come up with a more accurate Markovian model for the most likely areas to find lost people.