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16.7.4 Landmarks
Recommendation.- Natural and cultural landmarks,
such as bridges, prominent transmission lines, permanent
cable car installations, mine structures, forts, ruins, levees,
pipelines, and rocks, bluffs, cl~ffs, sand dunes, isolated
lighthouses, lightships, etc., when considered to be of
importance for viszral air navigation, should be shown.
Note.- Descriptive notes may be added.
16.7.5 Political boundaries
International boundaries shall be shown. Undemarcated and
undefined boundaries shall be distinguished by descriptive
notes.
16.7.6 Hydrography
16.7.6.1 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.
16.7.6.2 Recommendation.- The tint covering large
open water areas should be kept vely light.
Note.- A narrow band of darker tone may be used along
the shore line to envphasize this feature.
16.7.6.3 Recommendation.- Reefs and shoals including
rocky ledges, tidalplats, isolated rocks, sand, gravel, stone and
all similar areas should be shown by symbols when of
significant landmark value.
Note.- Groups of rocb may be shown by a fav representative
rock symbols within the area.
16.7.7 Contours
16.7.7.1 Contours shall be shown. The selection of
intervals shall be governed by the requirement to depict clearly
the relief features required in air navigation.
16.7.7.2 The values of the contours used shall be shown.
16.7.8.1 When hypsometric tints are used the range of
elevations for the tints shall be shown.
16.7.8.2 The scale of the hypsometric tints used on the
chart shall be shown in the margin.
16.7.9 Spot elevations
16.7.9.1 Spot elevations shall be shown at selected
critical points. The elevations selected shall always be the
highest in the immediate vicinity and shall generally indicate
the top of a peak, ridge, etc. Elevations in valleys and at lake
surface levels which are of special value to the aviator shall be
shown. The position of each selected elevation shall be
indicated by a dot.
16.7.9.2 The elevation (in metres or feet) of thc highest
point on the chart and its geographical position to the nearest
five minutes shall be indicated in the margin.
16.7.9.3 Recommendation.- The spot elevation of the
highest point in any sheet should be cleared of hypsometric
tinting.
16.7.10 Incomplete or unreliable relief
16.7.10.1 Areas that have not been surveyed for contour
information shall be labelled "Relief data incomplete".
16.7.10.2 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 ."
16.7.1 1 Escarpments
Recommendation.- Escapments should be shown when
they are prominent landmarks or when cultural detail is v q
sparse.
16.7.12 Wooded areas
16.7.12.1 Recommendation.- Wooded areas should be
shown.
Note.- On high latitude charts, the approximate extreme
northern or southern limits of tree growth may be shown.
Annex 4 - Aeronautical Charts Chapter 16
16.7.12.2 Where shown, the approximate extreme northern
or southern limits of tree growth shall be indicated by a dashed
black line and shall be appropriately labelled.
16.7.13 Date of topographic information
The date of latest information shown on the topographic base
shall be indicated in the margin.
16.8 Magnetic variation
16.8.1 Isogonic lines shall be shown.
16.8.2 The date of the isogonic information shall be
indicated in the margin.
16.9 Aeronautical data
16.9.1 Aeronautical data shown shall be kept to a
minimum consistent with the use of the chart for visual
navigation and the revision cycle (see 16.9.6).
16.9.2 Aerodromes
16.9.2.1 Land 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.
16.9.2.2 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
aerodrome in conformity with the example given in Appendix
2, provided they do not cause undesirable clutter on the
chart, shall be indicated.
16.9.2.3 Abandoned aerodromes which are still recognizable
　
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