Compensation for tolerances inherent in state-of-the-art locating and targeting. Based upon known approximate position and heading of the spotter, and certain data related to objects with the a vision area, an expanded field of vision related to the perspective of a virtual spotter location is generated....http://www.google.fr/patents/US6708109?utm_source=gb-gplus-shareBrevet US6708109 - Accurate targeting from imprecise locations
