What is a locator outer marker?

A locator outer marker An LOM is a navigation aid used as part of an instrument landing system (ILS) instrument approach for aircraft. Some countries, such as Canada, have abandoned marker beacons completely, replacing the outer marker with a non-directional beacon (NDB); and, more recently, with GPS fixes.Click to see full answer. Thereof, what can be substituted for an outer marker?The following means may be used to substitute for the outer marker: Compass locator; precision approach radar (PAR) or airport surveillance radar (ASR); DME, VOR, or nondirectional beacon fixes authorized in the standard instrument approach procedure; or a suitable RNAV system in conjunction with a fix identified inLikewise, what is the outer marker at airports? Outer Marker (OM) Its beam intersects the glide slope’s ray at an altitude of approximately 1400 ft (426.72 m) above the runway. It also roughly marks the point at which an aircraft enters the glide slope under normal circumstances, and represents the beginning of the final part of the landing approach. Thereof, where is the outer marker located? The outer marker (OM) is usually located 4-7 NM from the runway threshold. The middle marker (MM) is usually located 3,500 feet from the runway threshold. When the aircraft crosses the outer marker a flashing blue light will annunciate on the panel.What is a compass locator?compass locator. A low or medium frequency nondirectional beacon co-located with middle or outer marker beacons to help establish the pilot on the localizer for an ILS (instrument landing system) approach. Such locators have a power output of less than 25 watts and a range of at least 25 miles.