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scales should represent at least 200 km (I 10 NM).
16.3.2 A conversion scale (metreslfeet) shall he shnwn in
the margin.
16.4 Format
16.4.1 Recommendation.- The title and marginal notes
should be in one of the ICAO working languages.
Note.- The language of the publishing country may be
used in addition to the ICAO working language.
16.4.2 The information regarding the number of the
adjoining sheets and the unit of measurement to express
elevations shall be so located as to be clearly visible when the
sheet is folded.
16.4.3 Recommendation.- The method of folding
should be as follows:
Fold the chart on the long axis, near the mid-parallel of
latitude, face out; with the bottom half of the chart face
upward, fold inwards near the meridian, and fold both halves
backward in accordion folds.
16.4.4 Recommendation.- Whenever practicable, the
sheet lines should conform with those shown in the index in
Appendix 5.
Note 1.- The area covered by a sheet may vary from the
lines shown to satisfy particular requirements.
Note 2.- The value of adopting identical sheet lines for
ICAO 1:l 000 000 Charts and the corresponding sheer of the
International Map o f the World (IMW), provided aeronautical
requirements are not compromised, is recognized.
16.4.5 The sheet lines used shall be notified to ICAO for
publication in the ICAO Aeronautical Chart Catalogue
(Doc 7101).
16.4.6 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 28 km (15 NM) if
possible but in any case from the limiting parallels and
meridians of each chart to the neat line.
ANNEX 4 16-1 I/II/OI
Annex 4 - Aeronautical Charts Chapter I6
16.5 Projection
16.5.1 The projections shall be as follows:
1) between the Equator and 80" latitude: the Lambert
conformal conic projection, in separate bands for each
tier of charts. The standard parallels for each 4" band
shall be 40' south of the northern parallel and 40' north
of the southern parallel;
2) bctwccn 80" and 90" latitude: the Polar stereographic
projection with scale matching that of the Larnbert
conformal conic projection at latitude 80°, except that in
the northern hemisphere the Lambert conformal conic
projection may be. used between 80" and 84" latitude
and the Polar stereographic projection between 84" and
90" with the scales matching at 84" North.
16.5.2 Graticules and graduations shall be shown as
follows:
1) Parallels:
16.5.3.1 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 mrn
(0.08 in) extending on both sides of the graticule line for the
10' intervals.
16.5.4 All meridians and parallels shall be numbered in
the borders of the charts. In addition, each parallel shall
be numbered within the body of the chart in such a manner
that the parallel can be readily identified when the chart is
folded.
Note.- Meridians may be numbered within the body of
the chart.
16.5.5 The name and basic parameters of the projection
shall be indicated in the margin.
16.6 Identification
Sheet numbering shall be in conformity with the index in
Distance Graduations Ap- p- endix 5.
between on
Latitude parallels parallels Note.- The corresponding International Map of the World
(IMW) sheet number hay also be shown.
0" to 72" 30' 1'
72" to 84" 30' 5'
84" to 89" 30' 1"
89" to 90" 30' 5"
(Only on
degree parallels
from 72" to 89")
16.7 Culture and topography
16.7.1 Built-up areas
2) Meridians: 16.7.1.1 Cities, towns and villages shall be selected and
shown according to their relative importance to visual air
navigation.
Interval Graduations
between on 16.7.1.2 Recommendation.- Cities and towns of
Latitude meridians meridians suficient size should be indicated by the outline of their built-
0" to 52" 30' 1' up areas and not of their established city limits.
52" to 72" 30' 1'
(Only on even
numbered 16.7.2 Railroads
meridians)
72" to 84" 1" 1' 16.7.2.1 All railroads having landmark value shall be
84" to 89" 5" 1' shown.
89" to 90' 15" 1'
(Only on Nufe I.- In congested ureus, some railroads may be
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