Check out this excerpt from the pretty good report “TORA BORA REVISITED: HOW WE FAILED TO GET BIN LADEN AND WHY IT MATTERS TODAY”:
Afghan villagers who were providing food and other supplies for the Al Qaeda fighters at Tora Bora also confirmed bin Laden’s presence. Fury said some of the villagers were paid by the CIA for information about precise locations of clusters of fighters that could be targeted for bombing runs. The locals also provided fragmentary information on bin Laden’s movements within the Al Qaeda com- pound, though the outsiders never got near the sheikh. The cooperating villagers were given rudimentary global positioning devices and told to push a button at any spot where they saw significant numbers of fighters or arms caches. When the locals turned in the devices to collect their payments, the GPS coordinates recorded by pushing the buttons were immediately passed along to targeting officers, who programmed the coordinates into bombing runs.
The page design in that report is fantastic.
(Report link from No Fear of the Future.)