For example, at New York's JFK runway 31R the ILS identifier is I-RTH and the LOM ident is RT. LOMs use the first two letters of the parent ILS's identification.
#LOMS AUDIO DOWNLOAD CODE#
In the U.S., LOMs are identified by two-letter Morse code modulated at 1020 Hz. Some countries, such as Canada, have abandoned marker beacons completely, replacing the outer marker with a NDB and, more recently, with GPS fixes. The LOM is becoming less important now that GPS navigation is well established in the aviation community. Aircraft can navigate directly to the location using the NDB as well as be alerted when they fly over it by the beacon. An LOM is a navigation aid used as part of an instrument landing system (ILS) instrument approach for aircraft. In the United States, the outer marker has often been combined with a non-directional beacon (NDB) to make a locator outer marker ( LOM). The system gives the pilot a visual (blinking blue outer marker light) and aural (continuous series of audio tone morse code-like 'dashes') indication. The valid signal area is a 2,400 ft (730 m) × 4,200 ft (1,280 m) ellipse (as measured 1,000 ft (300 m) above the antenna.) When the aircraft passes over the outer marker antenna, its marker beacon receiver detects the signal. Its antenna is highly directional, and is pointed straight up. It is typically located about 1 NM (1.85 km) inside the point where the glideslope intercepts the intermediate altitude and transmits a 400 Hz tone signal on a low-powered (3 watts), 75 MHz carrier signal. The outer marker, which normally identifies the final approach fix (FAF), is situated on the same course/track as the localizer and the runway center-line, four to seven nautical miles before the runway threshold. Problems playing this file? See media help.
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