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or below (negative) the mathematical reference ellipsoid. track procedure and the final approach fix or point, as
appropriate.
Note.- In respect to the World Geodetic System - 1984
(WGS-84) defned ellipsoid, the dlfterence between the Isogonal. A line on a map or chart on which all points have
WGS-84 ellipsoidal height and orthometric height represents the same magnetic variation for a specified epoch.
WGS-84 geoid undzrlation.
Isogriv. A line on a map or chart which joins points of equal
Glide path. A descemt profile determined for vertical guidance angular difference between the North of the navigation grid
during a final aplproach. and Magnetic North.
Gregorian calenda~r. Calendar in general use; first introduced Landing area. That part of a movement area intended for the
in 1582 to define a year that more closely approximates the landing or take-off of aircraft.
tropical year than the Julian calendar (IS0 19108*).
Landing direction indicator. A device to indicate visually the
Note.- In the Gregorian calendar, common years have direction currently designated for landing and for take-off.
365 days and leap years 366 days divided into twelve
sequential months. Level. A generic term relating to the vertical position of an
aircraft in flight and meaning variously, height, altitude or
HeighL The vertical distance of a level, a point or an flight level.
object considered as a point, measured fiom a specified
datum. Magnetic variation. The angular difference between True
North and Magnetic North.
Helicopter stand An aircraft stand which provides for parking
a helicopter and, where air taxiing operations are con- Note.- The value given indicates whether the angular
templated, the helicopter touchdown and lift-off. drfterence is East or West of True North.
Heliport. An aerodrome or a defined area on a structure Manoeuvring area. That part of an aerodrome to be used for the
intended to be used wholly or in part for the arrival, take-off, landing and taxiing of aircraft, excluding aprons.
departure and surface movement of helicopters.
Marking. A symbol or group of symbols displayed on the
Holding procedure.. A predetermined manoeuvre which keeps surface of the movement area in order to convey
an aircraft within a specified airspace while awaiting aeronautical information.
hrther clearance:.
Metadata. Data about data (IS0 191 15*).
Human Factors principles. Principles which apply to
aeronautical design, certification, training, operations and Note.- Data that describes and documents data.
maintenance and which seek safe interface between the
human and other system components by proper consider- Minimum sector altitude. The lowest altitude which may be
ation to human performance. used which will provide a minimum clearance of 300 m
2511 1104
No. 53
Annex 4 - Aeronautical Charts Chapter I
(1 000 ft) above all objects located in an area contained
within a sector of a circle of 46 krn (25 NM) radius centred
on a radio aid to navigation.
Missed approach point (MAPt). That point in an -instrument
approach procedure at or before which the prescribed
missed approach procedure must be initiated in order to
ensure that the minimum obstacle clearance is not
infringed.
Missed approach procedure. The procedure to be followed if
the approach cannot be continued.
Movement area. That part of an aerodrome to be used for the
take-off, landing and taxiing of aircraft, consisting of the
manoeuvring area and the apron(s).
Obstacle. All fixed (whether temporary or permanent) and
mobile objects, or parts thereof, that are located on an area
intended for the surface movement of aircraft or that extend
Orthometric height. Height of a point related to the geoid,
generally presented as an MSL elevation.
Point light. A luminous signal appearing without perceptible
length.
Position (geographical). Set of coordinates (latitude and
longitude) referenced to the mathematical reference
ellipsoid which define the position of a point on the surface
of the Earth.
Precision approach procedure. An instrument approach
procedure utilizing azimuth and glide path information
provided by ILS or PAR.
Procedure altitudeheight. A specified altitudeheight flown
operationally at or above the minimum altitudeheight and
established to accommodate a stabilized descent at a prescribed
descent gradientJangle in the intermediatelfinal
approach segment.
above a defined surface intended to protect aircraft in
flight. Procedure turn. A manoeuvre in which a turn is made away
from a designated track followed by a turn in the opposite
direction to permit the aircraft to intercept and proceed
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