Once it has time to examine the drone, it'll find, amongst its programming, a complex and incredibly detailed map. Most of it is extremely difficult to figure out; if the map is correct, it's of a location several orders of magnitude larger than most planes! However, a careful review will, eventually, provide a more-or-less detailed map of the world they're on, including a route, which the drone was attempting to follow, leading straight to a large, free-standing portal.<br/><br/>It would be a hike of likely a few days, dealing with terrain equally broken and wrecked, but no opposition, before Reaper eventually reached the portal... which was exactly as described. A thirty-foot diameter, free-standing planar gate, from the looks of it, leading to a much greener, lusher world.