(b)
elevation station; and

(c)
precision distance measuring equipment (DME).

. abbreviation: MLS
Fr: système d’atterrissage hyperfréquences
middle marker A marker beacon that defines a point along the glide path (GP) of an instrument landing system (ILS) normally located at or near the point of decision height (DH).
. abbreviation: MM
Fr: radioborne intermédiaire
Military Flight Advisory Unit A military ground station established to provide en route flight information, airport advisory, ground control, field condition reports, flight planning, alerting service, navigation assistance, NOTAMs, PIREPs and weather reports. An MFAU may be used to accept and relay VFR and IFR position reports and ATC clearances.
. abbreviation: MFAU
Fr: unité militaire de consultation en vol
military operations area An airspace of defined dimensions established to segregate certain military activities from IFR traffic and to identify, for VFR traffic, where the activities are conducted.
. abbreviation: MOA
Fr: zone d’opérations militaires
military radar control unit
A military ATC facility established to provide ATC service using radar-derived information.
. abbreviation: MRCU
Fr: unité militaire de contr.le radar
military terminal control area A controlled airspace of defined dimensions normally established in the vicinity of a military aerodrome and within which special procedures and exemptions exist for military aircraft. The terminology (Class B, C, D or E equivalent) used for the designations of MTCAs describes the equivalent level of service and operating rules for civilian aircraft operating within the MTCA and under military control.
. abbreviation: MTCA
Fr: région de contr.le terminal militaire
military terminal control unit A system of control by surveillance and precision radar, consolidated into one specific military unit to provide radar traffic control service to IFR flights operating within a designated terminal control area (TCA).
. abbreviation: MTCU
Fr: unité militaire de contr.le terminal