An apparatus for decoding GNSS navigation data to generate at least a target string or subframe includes a demodulator and a processing unit. For this invention, the tread base rubber layer is comprised of three distinct zones, namely a circumferential annular central rubber zone positioned between two lateral annular rubber zones. The foams are characterized by a fine uniform cell structure and little or no foam collapse. In this manner, the switch is able to automatically associate the extension call with the billing identifier captured from the incoming directory assistance call. User input schemes include tap-based context zooming that enables users to selectively zoom in on objects including columns, images, and paragraphs by simply tapping on them. The flared inner surface of the tubular compressor elastically urges the tongues into pressure contact with the dental treatment tool to securely hold the tool in position, when the tool holder and the tubular compressor are in the tool holding position.