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guidance, expressed in terms of visibility and/or runway
visual range and decision altitudeheight (DM); and
d) landing in non-precision approach and landing
operations, expressed in terms of visibility and/or runway
visual range, minimum descent altitudeheight
(MDA/H) and, if necessary, cloud conditions.
Aerodrome reference point. The designated geographical
location of an ae:rodrome.
Aeronautical chart. A representation of a portion of the Earth,
its culture and relief, specifically designated to meet the
requirements of air navigation.
Aircrafi stand A designated area on an apron intended to be
used for parking an aircraft.
Air defence identification zone. Special designated airspace of
defined dimensions within which aircraft are required to
comply with special identification and/or reporting
procedures additional to those related to the provision of air
traffic services (-ATS).
Air taxiway. A defined path on the surface established for the
air taxiing of helicopters.
Air traffic service. A generic term meaning variously, flight
information service, alerting service, air traffic advisory
service, air traffic control service (area control service,
approach control service or aerodrome control service).
Air transit route. A defined path on the surface established for
the air transitting of helicopters.
Airway. A control area or portion thereof established in
the form of a comdor.
Altitude. The vertical distance of a level, a point or an object
considered as a point, measured from mean sea level
(MSL).
Apron. A defined area, on a land aerodrome, intended to
accommodate aircraft for purposes of loading or unloading
passengers, mail or cargo, fuelling, parking or maintenance.
Area minimum altitude (AMA). The lowest altitude to be
used under instrument meteorological conditions (IMC)
that will provide a minimum vertical clearance of 300 m
(1 000 ft) or in designated mountainous terrain 600 m
(2 000 ft) above all obstacles located in the area specified,
rounded up to the nearest (next higher) 30 m (1 00 ft).
Arrival routes. Routes identified in an instrument approach
procedure by which aircraft may proceed fiom the en-route
phase of flight to an initial approach fix.
ATS route. A specified route designed for channelling the
flow of traffic as necessary for the provision of air traffic
services.
Note I.- The term ATS route is used to mean variously,
airway, advisory route, controlled or uncontrolled route,
arrival or departure route. etc.
Note 2.- An ATS route is defined by route specifications
that include an ATS route designator, the track to or from
significant points (waypoints), distance between significant
points, reporting requirements and, as determined by the
appropriate ATS authority, the lowest safe altitude.
Bare Earth. Surface of the Earth including bodies of water
and permanent ice and snow, and excluding vegetation and
man-made objects.
ANNEX 4 1-1 2511 1104
No. 53
Annex 4 - Aeronautical Charts Chapter 1
Calendar. Discrete temporal reference systcm that provides
the basis for defining temporal position to a resolution of
one day (IS0 19108*).
Canopy. Bare Earth supplemented by vegetation height.
Change-over point. The point at which an aircraft navigating
on an ATS route segment defined by reference to very high
frequency omnidirectional radio ranges is expected
to transfer its primary navigational reference from the
facility behind the aircraft to the next facility ahead of the
aircraft.
Note.- Change-over points are established to provide the
optimum balance in respect of signal strength and quality
between facilities at all levels to be used and to ensure a
common source of azimuth guidance for all aircraft operating
along the same portion oj- a route segment.
Clearway. A defined rectangular area on the ground or water
under the control of the appropriate authority, selected or
prepared as a suitable area over which an aeroplane may
make a portion of its initial climb to a specified height.
Contour line. A line on a map or chart connecting points of
equal elevation.
Culture. All man-made features constructed on the surface of
the Earth, such as cities, railways and canals.
Cyclic redundancy check (CRC). A mathematical algorithm
applied to the digital expression of data that provides a
level of assurance against loss or alteration of data.
Danger area An airspace of defined dimensions within which
activities dangerous to the flight of aircraft may exist at
specified times.
Data quality. A degree or level of confidence that the data
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