1. A method for observing a target in a background environment comprising: equipping a user with a device having a graphics display and a GPS receiver for determining the position of the device; communicating the target position to the user's device; viewing on the graphics display of the user's device a perspective view of the target in the background environment; and viewing, with the orientation of the device in the approximate direction from the device to the target position, a geo-referenced billboard on an object in the background environment and displayed on the graphics display to convey information to the user, wherein said billboard remains in the same geo-referenced location on said object from different user-perspective views.