Middle marker (amber)
A point on the ILS glide slope Final altimeter check. MM should be part of briefing. The middle marker is 1/2 (3500 feet) mile from runway at decision height which is typically 200' AGL above TDZ.
Middle marker.
Marker beacon located where the center of the glideslope is 200ft above the runway
Mission computer (MC).
Mission processor; ...
Locator middle marker (LMM). Nondirectional radio beacon (NDB) compass locator, collocated with a middle marker (MM).
Locator outer marker (LOM). NDB compass locator, collocated with an outer marker (OM).
LOM. See locator outer marker.
MIDDLE MARKER- A marker beacon that defines a point along the glideslope of an ILS normally located at or near the point of decision height (ILS Category I).
- MIDDLE MARKER The middle marker should be located so as to indicate, in low visibility conditions, that visual contact with the runway is imminent, Ideally at a distance of 1050m from the threshold.
The Middle Marker displays the missed approach point, meaning the aircraft must pull up and try again if the parameters are not in line for a safe landing.
and landing, (3) OUTER MARKER- A marker beacon at or near the glideslope intercept altitude of an ILS approach, and is normally located four to seven miles from the runway threshold on the extended centerline of the runway, and (4) MIDDLE MARKER- A ...
The middle marker flashes an amber light, and it beeps in a pattern of alternating dashes and dots. It is normally the missed approach point, where the pilot must decide whether he can land safely. The inner marker is used only on certain approaches.
Compass locator. A low-power, low- or medium-frequency (L/MF) radio beacon installed at the site of the outer or middle marker of an ILS.
Related Definitions from Aviation Glossary ...
The outer marker OM is situated at or near the glideslope intercept altitude of the ILS localiser, the middle marker (MM) defines a point on the glideslope at or near decision height (DH).
There's also a pilot shop with an accompanying fuel station. And finally, there's an ILS on the airport. You've probably been hearing and seeing its Outer and Middle Markers during your descent, ...
 See also: Aircraft, Weather, Radar, Runway, Beacon
  
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