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Elevation. The vertical distance of a point or a level, on or affixed
to the surface of the earth, measured from mean sea level.
Ellipsoid height (Geodetic height). The height related to the
reference ellipsoid, measured along the ellipsoidal outer
normal through the point in question.
Final approach. That part of an instrument approach procedure
which commences at rhe specified final approach fix
or point, or where such a fix or point is not specified,
a) at the end of the last procedure turn. base turn or
inbound turn of a racetrack procedure, i f specified; or
b) at the point of interception UP tlte last track specified in
the approach procedure; and
ends at a point in the vicinity of an aerodrome from which:
1) a landing can be made; or
2) a missed approach procedure ih initiated.
Final approach and take-off area (FATO). A defined area
over which the final phase of the approach manoeuvre to
hover or landing is completed and from which the take-off
manoeuvre is commenced. Where the FAT0 is to be used
by performance Class 1 helicopters, the defined area
includes the rejected take-off area available.
Final approach fm orpoint. That fix or point of an instrument
approach procedure where the final approach segment
commences.
Final approach segment. That segment of an instrument
approach procedure in which alignment and descent for
landing are accomplished.
Flight information region. An airspace of defined dimensions
within which flight information service and alerting cewice
are provided.
Flight level. A surface of constant atmospheric pressure which
is related to a specific pressure datum, 1 013.2 hectopascals
(hPa), and is separated from other such surfaces by specific
pressure intervals.
Note 1.- A pressure type altimeter calibrated in accordance
with the Standard Atmosphere:
a) when set to a QNH altimeter setting, will indicate
altitude;
b) when set to a QFE altimeter setting, will indicate height
above the QFE reference datum;
c) when set to a pressure of 1 013.2 hPa, may be lised to
indicate flight levels.
Note 2.- The terms "height" atzd "altitude", used in
Note I ubove, indicute ultimetric ruther than geomerric
heights and altitudes.
Geodesic distance. The shortest distance between any two
points on a mathematically defined ellipsoidal surface.
Geodetic datum. A minimum set of parameters required to
define location and orientation of the local reference system
with respect to the global reference systemtframe.
Chapter I Annex 4 - Aeronautical Charts
Geoid. The equipotential surface in the gravity field of the
Earth which coincides with the undisturbed mean sea level
(MSL) extended continuously through the continents.
Note.- The geoid is irregular in shape because of local
gruviluliorrul disturburrces (wind tides, sulinity, current, etc.)
and the direction of gravity is perpendicular to the geoid at
every point.
Geoid undulation. The distance of the geoid above (positive)
or below (negative) the mathematical reference ellipsoid.
Note.- In respect to the World Geodetic System - I984
(WGS-84) defined ellipsoid, the difference between the
WGS-84 ellipsoidal height and orthometric height represents
WGS-84 geoid undulation.
Intermediate approach segment. That segment of an
instrument approach procedure between either the intermediate
approach fix and the final approach fix or point, or
between the end of a reversal, racetrack or dead reckoning
track procedure and the final approach fix or point, as
appropriate.
Isogonal. A line on a map or chart on which all points have
the same magnetic variation for a specified epoch.
Isogriv. A line on a map or chart which joins points of equal
angular difference between the North of the navigation grid
and Magnetic North.
Landing area. That part of a movement area intended for the
landing or take-off of aircraft.
Glide path. A descent profile for vertical guidance Landing direction indicator. A device to indicate visually the
during a final approach. direction currently designated for landing and for take-off.
Height. The vertical distance of a level, a point or an Level. A generic term relating to the vertical position of an
aircraft in flight and meaning variously, height, altitude or
object considered as a point, measured from a specified
flight level.
datum.
Magnetic variation. The angular difference between True
Helicopter stand. An aircraft stand which provides for parking North and Magnetic North.
a helicopter and, where air taxiing operations are contemplated,
　
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