Inner marker (IM): An ILS navigational facility that indicates to the pilot, both aurally and visually, that he is directly over the facility at an altitude of 100 feet on final ILS approach, providing he is on the glide path.
Inner marker.
Innermost marker beacon on an ILS
INS.
Inertial Navigation System ...
INNER MARKER- A marker beacon used with an 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, ...
- INNER MARKER The inner marker, when installed, shall be located so as to indicate in low visibility conditions the imminence of arrival at the runway threshold.
(c) The inner marker (IM) wll indicate a point at which an aircraft is at a designated decision height (DH) n the glide path between the MM and landing threshold.
The inner marker is used only on certain approaches. Its light is white, and the tone is a series of Morse dots.
NDB Non-Directional radio Beacon. A low-power AM radio transmitter on the ground used as a navigational aid. See also ADF ...
The Middle marker also indicates that the airport should be just within visual range if weather conditions are gloomy. The final Inner Marker signifies that the runway is directly in front of the aircraft and that touch-down is quickly approaching ...
 See also: Altitude, Direct, Aircraft, ILS, Air traffic
  
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