Abstract: An object locating system (100) in which there is an observation device (104) observing at least three datums (106, 112, 114), each of which datums (106, 112, 114) having a positioning system that reports it position to the observation device (104). The positioning systems of the datums (106, 12, 114) being calibrated so as to accurately report their relative positions. The observation device (104) has a camera whose field of view (116) contains an object (18) to be located as well as at least two of the datums (106, 112,114) and a range finder that measures the distance (110) between the observation device (104) and at least one object (18) within the field of view (116) of the camera.