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other language may be used in addition to the ICAO working
language.
17.4.2 The information regarding the number of the
adjoining sheets and the unit of measurement used to express
elevation shall be so located as to be clearly visible when the
sheet is folded.
17.4.3 Recommendation.- The method of folding
should be as follows:
Fold the chart on the long axis near the mid-parallel of
latirude, face out, with the bottom part of the charr face
upward. Fold inwards near the meridian and fold both halves
backward in accordion folds.
17.4.4 Recommendation.- Whenever practicable, sheets
should be quarter sheets of the World Aeronautical Chart -
ICAO 1:l 000 000. An appropriate index to adjacent sheets,
showing the relationship between the two chart series should be
included on the face oj-the chart or on the reverse side.
Note.- Sheet lines may be varied to satisb particular
requirements.
17.4.5 Recommendation.- Overlaps should be provided
by extending the chart area on the top and right side
beyond the area given on the index. This overlap area should
contain all aeronautical, topographical, hydrographical and
cultural information. The overlap should extend up to I5 km
(8 NM), ifpossible, but in any case from the limiting parallels
and meridians of each chart to the neat line.
17.5 Projection
17.5.1 A conformal (orthomorphic) projection shall be
used.
ANNEX 4 17-1
Annex 4 - Aeronautical Charts Chapter 17
17.5.2 Recommendation.- The projection of the World
Aeronautical Chart - ICAO 1:l 000 000 should be used.
17.5.3 Parallels shall be shown at intervals of 30'.
17.5.3.1 Meridians shall normally be shown at intervals
of 30'.
Note.- At high latitudes this interval may be increased.
17.5.4 Graduation marks shall be. shown at 1' intervals
along each whole degree meridian and parallel, extending
away from the Greenwich Meridian and from the Equator.
Each 10' interval shall be shown by a mark on both sides of
the graticule line.
17.5.4.1 Recommendation.- The length of the graduation
marks should be approximately 1.3 mm (0.05 in) for the
1' intervals, and 2 mm (0.08 in) for the 5' intervals and 2 mm
(0.08 in) extending on both sides of the graticule line for the
1@ intervals.
17.5.5 All meridians and parallels shown shall be
numbered in the borders of the chart.
17.5.5.1 Recommendation.- Each meridian and parallel
should be numbered within the body of the chart whenever
this data is required operationally.
17.5.6 The name and basic parameters of the projection
shall be indicated in the margin.
17.6 Identification
17.6.1 Each sheet shall be identified by a name which
should be that of the principal town or of a main geographical
feature appearing on the sheet.
17.6.1.1 Recommendation.- Where applicable, sheets
should also be identified by the reference number of
the corresponding World Aeronautical Chart - ICAO
I:! 000 000, with the addition of one or more of rhe following
letter sufixes indicating the quadrant or quadrants:
Letter Chart quadrant
North- West
North-East
South-East
South- West
17.7 Culture and topography
17.7.1 Built-up areas
17.7.1.1 Cities, towns and villages shall be selected and
shown according to their relative importance to visual air
navigation.
17.7.1.2 Recommendation.- Cities and towns of sufficient
size should be shown by the outline of their built-up
areas and not of their established city limits.
17.7.2 Railroads
17.7.2.1 All railroads having landmark value shall be
shown.
Note 1.- In congested areas, some railroads may be
omitted in the interest of legibility.
Note 2.- Railroads may be named.
Note 3.- Rail stations may be shown.
17.7.2.2 Tunnels shall be shown when they serve as
prominent landmarks.
Note.- A descriptive note may be added, if necessary, to
accentuate this feature.
17.7.3 Highways and roads
17.7.3.1 Road systems shall be shown in sufficient detail
to indicate significant patterns from the air.
Note.- Roads under construction may be shown.
17.7.3.2 Recommendation.- Roads should not be
shown in built-up areas unless they can be distinguished from
the air as definite landmarks.
Note.- The numbers or names of important highways may
be shown.
17.7.4 Landmarks
Recommendation.- Natural and cultural landmarks,
such as bridges, mine structures, lookout towers, forts, ruins,
levees, pipelines, prominent transmission lines, permanent
cable car installations, and rocks, blufls, clifls, sand dunes:
isolated lighthouses, lightships, etc., when considered to be of
　
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