Aerial photographs are utilized to produce an image of images which illustrate the topography of golf holes from an overhead perspective. According to one aspect of the present invention, a mechanism is provided to allow a user to group some of the players according to a theme or scene, where each of the players is located in a zone. The detector assembly includes first and second signal generators and first and second signal detectors vectoring the location of the conveyance. The performance drift is then observed, whereby in monitoring said drift, trends may be determined and time or cycles to failure predicted.