A method in a wireless communications device for transmitting current location information representing a current location of the wireless communications device. The sensor chip includes a semiconductor chip and a metal dam bar protruding from the active surface of the semiconductor chip. The intensities of both beams are compared once they have crossed over the test tubes and the intensity of the first beam is varied so that said intensities are equal. The substrate includes a first principal plane including a mounting region and a second principal plane. Also disclosed are the use of the inventive fibers, fabrics made therefrom, and objects containing the fiber.