1. A method comprising the steps of: a) receiving, by a reconnaissance device, a three-dimensional reference model of surroundings of a target object, the three-dimensional reference model including known geographical location data; b) matching, by the reconnaissance device, an image of the target object and its surroundings, captured by the reconnaissance device from an observation position for an observer, with the reference model; c) determining, by the reconnaissance device, position data of the target object in the reference model as relative position data with respect to the known geographic location data of the reference model; and d) transmitting, by the reconnaissance device, the relative position data to an airborne weapon system, wherein the reconnaissance device is independent of the airborne weapon system.