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importance for visual air navigation, should be shown.
Note.- Descriptive notes may be added.
17.7.5 Political boundaries
International boundaries shall be shown. Undemarcated or
undefined boundaries shall be distinguished by descriptive
notes.
Note.- Other boundaries may be shou~n.
Chapter 17 Annex 4 - Aeronautical Charts
17.7.6 Hydrography 17.7.10 Incomplete or unreliable relief
17.7.6.1 All water features compatible with the scale of
the chart comprising shore lines, lakes, rivers and streams
(including those non-perennial in nature), salt lakes, glaciers
and ice caps shall be shown.
17.7.6.2 Recommendation.- The tint covering large
open water areas should be kept very light.
Note.- A narrow band of darker tone may be used along
the shore line to emphasize this feature.
17.7.6.3 Recommendation.- Reefs and shoals, including
rocky ledges, tidal flats, isolated rocks, sand, gravel, stone
and all similar areas should be shown by symbols when of
significant landmark value.
Note.- Groups of rocks may be shown by a few representative
rock symbols within the area.
17.7.7 Contours
17.7.10.1 Areas that have not been surveyed for contour
information shall be labelled "Relief data incomplete".
17.7.10.2 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 reliability of relief information on this
chart is doubtful and elevations should be used with
caution."
17.7.1 1 Escarpments
Recommendation.- Escarpments should be shown when
they are prominent landmarks or when cultural detail is very
sparse.
17.7.12 Wooded areas
17.7.7.1 Contours shall be shown. The selection of 17.7.12.1 Recommendation.- Wooded areas should be
intervals shall be governed by the requirement to depict clearly shown.
the relief features required in air navigation.
Note.- On high latitude charts the approximate extreme
17.7.7.2 The values of lhe contours used shall be shown. northern or southern limits of tree growth may be shown.
17.7.8 Hypsometric tints
17.7.8.1 When hypsometric tints are used, the range of
elevations for the tints shall be shown.
17.7.8.2 The scale of the hypsometric tints used on the
chart shall be shown in the margin.
17.7.12.2 Where shown, the approximate northern or
southern limits of tree growth shall be indicated by a dashed
black line and shall be appropriately labelled.
17.7.13 Date of topographic information
The date of latest information shown on the topographic base
shall be indicated in the margin.
17.7.9 Spot elevations
17.7.9.1 Spot elevations shall be shown at selected
critical points. The elevation selected shall always be the 17.8 Magnetic variation
highest in the immediate vicinity and shall generally indicate
the top of a peak, ridge, etc. Elevations in valleys and at lake 17.8.1 Isogonic lines shall be shown.
surface levels which are of navigational value shall be shown.
The position of each selected elevation shall be indicated by 17.8.2 The date of the isogonic information shall be
a dot. indicated in the margin.
17.7.9.2 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.
17.9 Aeronautical data
17.7.9.3 Recommendation.- The spot elevation of the
highest point on any sheet should be cleared of hypsometric
tinting.
17.9.1 Aeronautical information shall be shown consistent
with the use of the chart and the revision cycle.
Annex 4 - Aeronautical Charts Chapter 17
17.9.2 Aerodromes
17.9.2.1 Land and water aerodromes and heliports shall
be stlown 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.
17.9.2.2 The aerodrome elevation, the lighting available,
the type of runway surface and the length of the longest
runway or channel, shown in abbreviated form for
each aerodro~ric: in confor-111ity with the example given in
Appendix 2, provided they do not cause undesirable clutter on
the chart, shall be indicated.
17.9.2.3 Abandoned aerodromes which are still recognizable
as aerodromes from the air shall be shown and
identified as abandoned.
17.9.3.1 Significant obstacles shall be shown.
Note.- Obstacles of a height of 100 m (300 9) or more
ubuve ground are nornlally regarded as sigttificant obstacles.
17.9.3.2 When considered of importance to visual flight,
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ICAO 附件4 Aeronautical Charts an04_10ed(41)
