1. A method for identifying a part of a target object, comprising: (a) acquiring reference location image data, first geolocation data and first heading angle data using an imaging device directed toward the target object and located at a known reference location relative to a coordinate system of the target object; (b) acquiring feature location image data, second geolocation data and second heading angle data using an imaging device directed toward an area on the target object and located at an unknown feature location relative to the coordinate system of the target object; (c) computing an offset in Cartesian coordinates between the feature location and the reference location, wherein the offset is a function of coordinates in said first and second geolocation data and heading angles in said first and second heading angle data; (d) retrieving three-dimensional model data of the target object from a three-dimensional model database; (e) displaying a three-dimensional model image of at least a portion of the target object with a viewpoint that is a function of the offset computed in step (c) and the camera field-of-view angle, said three-dimensional model image representing said three-dimensional model data retrieved from the three-dimensional model database; (f) displaying a feature location image of the same portion of the target object as an overlay or background to said three-dimensional model image, said feature location image representing at least portions of said feature location image data; (g) selecting a point in the displayed feature location image; (h) retrieving additional three-dimensional model data from the three-dimensional model database in response to said selecting; and (i) displaying symbology representing the retrieved additional three-dimensional model data.