In certain embodiments, an apparatus comprises a laser detector, a lens, a Global Positioning System (“GPS”) receiver, a digital ground map, a tilt measurement device, and one or more processors. The laser detector is operable to detect a laser light emitted from a laser source, the lens is operable to pass the laser light to the laser detector, the GPS receiver is operable to determine a GPS location of an aircraft, and the tilt measurement device is operable to determine a tilt angle of the aircraft. The one or more processors of the apparatus are operable to determine a line of sight based on the detected laser light, the GPS location, and the tilt angle. The one or more processors are further operable to determine a location of the laser source from an intersection of the line of sight and the digital ground map.