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inner marker beacon
['ɪnə 'ma:kə 'bi:kən]
avia., amer.
A marker beacon used with an instrument landing system
ILS
CAT II
precision approach located between the middle marker and the end of the ILS runway, transmitting a radiation pattern keyed at six dots per second and indicating to the pilot, both aurally and visually, that he/she is at the designated decision height
DH
, normally 100 ft above the touchdown zone elevation, on the ILS CAT II approach. It also marks progress during a CAT III approach.
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