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Annex 4 -Aeronautical Charts Chapter 18
18.5.3.1 Graduations on the meridians shall be shown at lighthouses, lightships, etc., when considered to be of
intervals not exceeding 5'. importance for visual air navigation, should be shown.
18.5.4 Thc graduation marks shall cxtcnd away from the N o t e . Descriptive notes may be added.
Greenwich Meridian and from the Equator.
18.5.5 All meridians and parallels shown shall be 18.6.5 Political boundaries
numbered in the borders of the chart. In addition, when
required, meridians and parallels shall be numbered within the International boundaries shall be shown. Undemarcated and
body of the chart in such a manner that they 'can be readily undefined boundaries shall be distinguished by descriptive
idcntificd whcn thc chart is foldcd. notes.
18.6.6 Hydrography
18.6 Culture and topography
18.6.6.1 All water features compatible with the scale of
the chart comprising shore lines, lakes, rivers and streams
18.6.1 Built-up areas (including those non-perennial in nature), salt lakes, glaciers
and ice caps shall be shown.
18.6.1.1 Cities, towns and villages shall be selected and
shown according to their relative importance to visual air 18.6.6.2 Recommendation.- The tint covering large
navigation. open water areas should be kept very light.
18.6.1.2 Recommendation.- Cities and towns of suf- Note.- A narrow band of darker tone may be used along
ficient size should be indicated by the outline of their built-up the shore line to emphasize this feature.
areas and not of their established city limits.
18.6.6.3 Recommendation.- Reefs and shoals includ-
18.6.2 Railroads
ing rocky ledges, tidalflats, isolated rocks, sand, gravel, stone
and all similar areas should be shown by a symbol when of
significant landmark value.
18.6.2.1 All railroads having landmark value shall be
shown.
18.6.7 Contours
Note.- In congested areas, some railroads may be omitted
in the interest of legibility. 18.6.7.1 Contours shall be shown. The selection of
intervals shall be governed by the requirement to depict
18.6.2.2 Recommendation.- tunnels should clearly the relief features required in air navigation.
be shown.
18.6.7.2 The values of the contours used shall be shown.
Note.- A descriptive note may be added.
18.6.8 Hypsometric tints
18.6.3 Highways and roads 18.6.8.1 When hypsometric tints are used the range of
elevations for the tints shall be shown.
18.6.3.1 Road systems shall be shown in sufficient detail
to indicate significant patterns from the air. 18.6.8.2 The scale of the hypsometric tints used on the
chart shall be shown in the margin.
18.6.3.2 Recommendation.- Roads should not be
shown in built-up areas unless they can be distinguished from
the air as definite landmarks. 18.6.9 Spot elevations
18.6.9.1 Spot elevations shall be shown at selected
18.6.4 Landmarks critical points. The elevations selected shall always be the
highest in the immediate vicinity, and shall generally indicate
Recommendation.- Natural and cultural landmarks, the top of a peak, ridge, etc. Elevations in valleys and at lake
such as bridges, prominent transmission lines, permanent surface levels which are of value to visual air navigation shall
cable car installations, mine structures, forts, ruins, levees, be shown. The position of each selected elevation shall be
pipelines and rocks, blufls, clifSs, sand dunes, isolated indicated by a dot.
Chapter 18
18.6.9.2 The elevation (in metres or feet) of the highest
point on the chart and its geographical position to the nearest
five minutes shall be indicated in the margin.
18.7 Magnetic variation
18.7.1 Isogonic lines shall be shown.
18.6.9.3 Recommendation.- The spot elevation of the
highest point in any sheet should be cleared uf hyp~umelric
tinting.
18.7.2 The date of isogonic information shall be indicated
in the margin.
18.6.10 Incomplete or unreliable relief 18.8 Aeronautical data
18.6.10.1 Areas that have not been surveyed for contour
information shall be labelled "Relief data incomplete". 18.8.1 Aerodromes
T.and and water aerodromes and heliports shall be shown with
their names, to the extent that they do not produce undesirable
congestion on the chart, priority being given to those of
greatest aeronautical significance.
18.6.10.2 Charts on which spot elevations are generally
unreliable shall bear a warning note prominently displayed on
the face of the chart in the colour used for aeronautical
information, as follows:
"Warning - The reliabili~yo f relief infor-~na~ion this
chart is doubtful and elevations should be used with
caution."
　
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