- 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. They operate between 190 and 535 kHz and transmit a continuous carrier with either 400 or 1020 Hertz (Hz) modulation. The compass locator positioned along the outer marker is called the outer compass locator and that along the middle marker is called the middle compass locator. These are indicated on the charts by the symbol .
Aviation dictionary. 2014.
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