noun
Meaning 1
A ground-based radio navigation aid consisting of a pair of colocated radio beacons at the final approach fix of an ILS or IGS approach course: an NDB to guide aircraft to the approach fix, and an outer marker to alert aircraft as they pass over the station.
Definition source: English Wiktionary via Wiktextract
Usage: US
Topics: aeronautics, aerospace, aviation, business, engineering, natural-sciences, physical-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided