1. A method for aligning an image generated by an image display system including an image intensifier with a line of sight of a user of the image display system, including the steps of: a) displaying to the user a first symbol on an image display; b) aligning the first symbol with a reference symbol; c) recording movement of the image display to align the first symbol with the reference symbol; d) displaying to the user at least one alternate symbol on the image display; e) aligning the alternate symbol with the reference symbol; f) recording movement of the image display to align the alternate symbol with the reference symbol; g) determining magnification of a forward scene induced by the image intensifier from the recorded movement of the image display in steps c) and f).