1. A method of operating a mobile device to provide a display of supplementary information aligned with a view of a scene, the mobile device including a camera, a display, at least one processor and at least one position sensor, the mobile device being in networked communication via a mobile network with a remote server, the method comprising the steps of: (a) obtaining a first image from the camera; (b) uploading at least said first image via the mobile network to the remote server together with corresponding data from the at least one position sensor; (c) performing image processing to track image motion between said first image and subsequent images obtained from the camera, and hence determining a mapping between features of a reference image and features of a current image obtained from the camera, said reference image being selected from the group consisting of: said first image; and a second image for which transformation parameters were uploaded to the server corresponding to a mapping between said first image and said second image, said processing being performed by the at least one processor of the mobile device; (d) receiving via the mobile network data indicative of a pixel location for display of supplementary information within said reference image, said receiving including receiving data indicative of a pixel location for display of supplementary information relating to an object obscured from view; (e) employing said mapping to determine a corresponding pixel location for display of the supplementary information within the current image; and (f) displaying the supplementary information on the display correctly aligned with the view of the scene.