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provided meet the requirements of the data user in terms of
accuracy, resolution and integrity.
Datum. Any quantity or set of quantities that may serve as a
reference or basis for the calculation of other quantities
(IS0 19104*).
Displaced threshold. A threshold not located at the extremity
of a runway.
Electronic aeronautical chart display. An electronic device by
which flight crews are enabled to execute, in a convenient
and timely manner, route planning, route monitoring and
navigation by displaying required information.
* All IS0 Standards are listed at the end of this chapter.
Elo&'on. The vertical distance of a point or a level, on or affixed
to the surface of the earth, measured fiom 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.
Feature. Abstraction of real world phenomena (IS0 19101*).
Final approach. That part of an instrument approach
procedure which commences at the 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, if specified; or
b) at the point of interception of the 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 is initiated.
Final approach and take-ofl 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 perfonnancc Class 1 helicopters, the defined area
includes the rejected take-off area available.
Final approach fm or point. 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.
Flkht informalion region. An airspace of defined dimensions
within which flight information service and alerting service
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;
6) 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 used to
indicate flight levels.
25/11/04
No. 53
Chapter I Annex 4 - Aeronautical Charts
Note 2.- The terms "height" and "altitude". used in Hypsometric tints. A succession of shades or colour
Note I above, indicate altimetric rather than geometric
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 systemlfiame.
Geoid The equipotential surface in the gravity field of the
Earth which coirbcides with the undisturbed mean sea level
(MSL) extended continuously through the continents.
gradations used to depict ranges of elevation.
Initial approach segmenL That segment of an instrument
approach procedure between the initial approach fix and the
intermediate approach fix or, where applicable, the final
approach fix or point.
Instrument approach procedure. A series of predetermined
manoeuvres by reference to flight instruments with specified
protection from obstacles fiom the initial approach fix,
or where applicable, from the beginning of a defined
anival route to a point fiom which a landing can be
completed and thereafter, if a landing is not completed, to
a position at which holding or en-route obstacle clearance
Note.- The geoid is irregular in shape because of local criteria apply.
gravitational disturbances (wind tides, salinity, current, etc.)
and the direction of gravity is perpendicular to the geoid at Intermediate approach segmenL That segment of an
every point. instrument approach procedure between either the intermediate
approach fix and the final approach fix or point, or
Geoid undulation. 'The distance of the geoid above (positive) between the end of a reversal, racetrack or dead reckoning
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