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and control zones necessary to the function of the chart;
5) designated reporting points necessary to the function of
the chart;
6) ocean station vessels.
Note.- Other aeronautical data may be shown provided
that they do not detract from the legibility of essential
information.
1 9.9.2 Recommendation.- Aeronautical ground lights
and marine lights useful for air navigation should be shown
where other means of navigation are non-existent.
CHAPTER 20. ELECTRONIC AERONAUTICAL CHART DISPLAY - ICAO
20.1 Function
The Electronic Aeronautical Chart Display - ICAO, with
adequate back-up arrangements and in compliance with the
requirements of Annex 6 for charts, shall enable flight crews
to execute, in a convenient and timely manner, route planning,
route monitoring and navigation by displaying required
information.
20.2 Information available for display
20.2.1 The Electronic Aeronautical Chart Display -
ICAO shall be capable of displaying all aeronautical, cultural
and topographic information required by Annex 4, Chapter 5
and Chapters 7 through 19.
20.2.2 Recommendation.- The Electronic Aeronautical
Chart Display - ICAO should be capable of displaying all
aeronautical, cultural and topographic information recommeruled
by Annex 4, Chapter 5 and Chapters 7 through 19.
Note.- The Electronic Aeronautical Chart Display -
ICAO may display supplementary information, in addition to
that required for the equivalent paper chart, which may be
considered usefil for safe navigation.
20.3.2 Display mode and generation
of neighbouring area
20.3.2.1 The Electronic Aeronautical Chart Display -
ICAO shall be capable of continuously plotting the aircraft's
position in a true motion mode where reset and generation of
the surrounding area shall take place automatically.
Note.- Other modes, such as static chart displays, may be
available.
20.3.2.2 It shall be possible manually to change the chart
area and the position of the aircraft relative to the edge of the
display.
20.3.3 Scale
It shall be possible to vary the scale at which a chart is
displayed.
20.3.4 Symbols
Symbols used shall conform to those specified for electronic
charts in Appendix 2 - ICAO Chart Symbols except where it
is dcsircd to show itcms for which no ICAO chart symbol is
provided. In these cases electronic chart symbols shall be
chosen which:
20.3 Display requirements
a) employ a minimum use of lines, arcs and area fills;
20.3.1 Display categories
20.3.1.1 Information available for display shall be
subdivided into the following categories:
a) basic display information, permanently retained on the
display and consisting of the minimum information
essential for the safe conduct of flight; and
b) other display information, which may be removed from
the display or displayed individually on demand, and
consisting of information not considered essential for
the safe conduct of flight.
20.3.1.2 It shall be a simple function to add or remove
other display information but shall not be possible to remove
information contained in the basic display.
b) do not cause confusion with any existing aeronautical
chart symbol;
C) do not impair the legibility of the display.
Note.- Additional details for each symbol may be added
according to the resolution of the output media, but any
enhancements may not change the basic recognizability of the
symbol.
20.3.5 Display hardware
20.3.5.1 The effective size of the chart presentation shall
be sufficient to display the information required by 20.2
without excessive scrolling.
ANNEX 4 20-1 28/11/02
Annex 4 - Aeronarrtical Charts Chapter 26
20.3.5.2 The display shall have the capabilities required to
accurately portray required elements of Appendix 2 - ICAO
Chart Symbols.
20.3.5.3 The method of presentation shall ensure that the
displayed information is clearly visible to the observer in the
conditions of natural and artificial light experienced in the
cockpit.
20.3.5.4 The display luminance shall be adjustable by the
flight crew.
20.4 Provision and updating of data
20.4.1 The provision and updating of data for use by the
display shall be in conformance with the aeronautical data
quality system requirements.
Note - For aeronautical data quality system requirements
see Chapter 2, 2.17 and Annex IS, Chapter 3, 3.2.
20.4.2 The display shall be capable of automatically
accepting authorized updates to existing data. A means of
ensuring that auttiorized data and all relevant updates to that
data have been correctly loaded into the display shall be
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