![]() The coding identification of the outer locator consists of the first two letters of the three-letter identifier of the associated LOC. ![]() When used in conjunction with an ILS front course, the compass locator facilities are collocated with the outer and/or MM facilities. Compass locators are low-powered NDBs and are received and indicated by the ADF receiver. The back-course marker, where installed, indicates the back-course FAF. It indicates the point at which an aircraft is at the decision height on the glide path during a Category II ILS approach. The inner marker (IM), where installed, is located on the front course between the MM and the landing threshold.
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