inner marker

English

Noun

inner marker (plural inner markers)

1. (aviation) A type of marker beacon placed to indicate when an aircraft crosses the runway threshold of a Category II or Category III ILS or IGS approach, triggering a continuous visual and aural sequence of rapid-fire Morse code dots from the marker beacon receiver in the cockpit of an aircraft flying over the marker.

Synonyms

• IM

Hypernyms

• marker beacon

Coordinate terms

• fan marker
• middle marker
• outer marker