Locator Outer Marker

Locator Outer Marker

has taken the process further and abandoned marker beacons altogether, replacing the outer marker in ILS approaches entirely with the NDB.

In the US, LOMs are identified by two-letter Morse code modulated at 1020 Hz. LOMs use the first two letters of the parent ILS's identification. For example, at New York's JFK runway 31R the ILS ident is I-RTH and the LOM ident is RT. If this facility were a Locator Middle Marker (LMM) its ident would be the last two letters, TH.

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