Re: communications
The MLS was a joint development between the FAA, NASA, and the U.S. Department of Defense and was designed to provide precision navigation guidance for exact alignment and descent of aircraft on approach to a runway. It provides azimuth, elevation, and distance. Similar to other precision landing systems, lateral and vertical guidance may be displayed on conventional course deviation indicators or incorporated into multipurpose cockpit displays. Range information can also be displayed by conventional DME indicators and also incorporated into multipurpose displays. The MLS supplements the Instrument Landing System (ILS) as the standard landing system in the U.S. for civil, military, and international civil aviation. At international airports, ILS service is protected to 2010.