The runway visual range system is used by air traffic controllers to provide information to pilots on runway visibility in order to secure safer landings. The basic system comprises a visibility sensor, a background luminance meter and a computer. The visibility sensor has been specifically designed for runway applications and follows the U.S. Federal Aviation Administration (FAA) and International Civil Aviation Organization (ICAO) guidelines.
The Vaisala Group is a successful international technology company that develops and manufactures electronic measurement systems and equipment for meteorology, environmental sciences, traffic safety and industry. Vaisala employs over 1,000 professionals and achieved net sales of EUR 180.6 million in 2004. Vaisala serves customers throughout the world. In 2004, exports outside Finland accounted for 97% of net sales. Vaisala's A-series shares are quoted on the Helsinki Stock Exchange.