A locator is a low powered NDBNDB —Non-Directional Beacon that can be used by aircraft to firstly navigate to the overhead of an airfield, then on an oval pattern that will bring them back in on the ILSILS —Instrument Landing System track, enabling them to intercept the localiser. This is useful as the ILSILS —Instrument Landing System is directional, whereas the NDBNDB —Non-Directional Beacon is not. Locators have a two letter ident, unlike most navaidnavaid —Navigation Aids which have three.

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What facility, associated with an ILSILS —Instrument Landing System, has a two letter identification code?