A method and apparatus for retrieving information about an object of interest to an observer. A position sensor wearable by the observer generates position information indicating the position of the observer relative to a fixed position. A direction sensor wearable by the observer generates direction...http://www.google.com.au/patents/US6985240?utm_source=gb-gplus-sharePatent US6985240 - Method and apparatus for retrieving information about an object of interest to an observer
