A method and devices are disclosed for producing a differential RTT vector (RTV) that is based upon the relative change in an airborne measuring station velocity relative to the target wireless device based upon RTT measurements, the RTT measurements being taken at known time intervals to a ground based target station, and the velocity and heading of the airborne measuring station. In one embodiment, the target device is an access point or station conforming to the IEEE 802.11 standard and the airborne measuring station 110 may also be a device that conforms to the IEEE 802.11 standard. The disclosed method enables the quick determination of the location of a target station to an accuracy of, for example, in the order of one half degree of bearing within, for example, a period in the order of 5 seconds.