Plain English Meaning
A range of low radio frequencies, from 190 to 535 thousand cycles per second, that older navigation beacons broadcast on. Pilots tune these frequencies on the ADF radio to find and follow the beacon.
Full Definition
The low and medium frequency band, expressed in kilohertz, used by compass locators and non-directional beacons (NDBs) for navigation. Compass locators associated with an ILS transmit on assigned frequencies within this band and are received by the aircraft's automatic direction finder (ADF).
Context Anchor
Seen in instrument approach for , especially when describing compass locators used near marker locations or .