Novel printing surfaces for off-set printing blankets are provided having a resilience of less than about 40% and an average surface roughness of less than about 0. The airport-located subsystems are coupled by way communication paths, such as land line telephone links, to a remote flight operations control center. Voice signals are received from a user who is accessing the website, which are interpreted to determine navigation commands. The plurality of Chien search circuits configured to calculate the element by connecting the first bit stream and the second bit stream, and substitute the calculated element into the error correction search equation. Multiple covers, separated by notches, may attach to an expanse, thereby allowing one closure rail to secure multiple panels. At least one propagation property associated with the detected shear waves is determined, and the determined at least one propagation property is displayed.