| http://www.w3.org/ns/prov#value | - Referring now to FIG. 4, the operation of the apparatus of FIG. 3 according to one embodiment of the invention may be understood as including the steps of receiving the direction indication P in an external coordinate system from input apparatus such as radar and conversion of the direction indication P to an indication Pr in a relative coordinate system, such as the coordinate system of an airpla
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