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as aerodromes from the air shall be shown and
identified as abandoned.
16.9.3.2 When considered of importance to visual flight,
prominent transmission lines and permanent cable car installations,
which are obstacles, shall be shown.
16.9.4 Prohibited, restricted and danger areas
Prohibited, restricted and danger areas shall be shown.
16.9.5 Air traffic services system
16.9.5.1 Significant elements of the air traffic services
system including, where practicable, control zones, aerodrome
traffic zones, control areas, flight information regions and
other airspaces in which VFR flights operate shall be shown
together with the appropriate class of airspace.
16.9.5.2 Where appropriate, the air defence identification
zone (ADIZ) shall be shown and properly identified.
Note.- ADIZ procedures may be described in the chart
legend.
16.9.6 Radio navigation aids
Radio navigation aids shall be shown by the appropriate
symbol and named, but excluding their frequencies, coded
designators, times of operation and other characteristics unless
any or all of this information which is shown is kept up to date
by means of new editions of the chart.
1 6.9.7 Supplementary information
16.9.7.1 Aeronautical ground lights together with their
characteristics or their identifications or both shall be shown.
16.9.7.2 Marine lights on outer prominent coastal or
isolated features of not less than 28 km (15 NM) visibility
range shall be shown:
I ) where they are not less distinguishable than more
powerhl marine lights in the vicinity;
16.9.3 Obstacles
16.9.3.1 Obstacles shall be shown.
N o t e . Objects of a height of I00 m (300fi) or more above
ground are normally regarded as obstacles.
2) where they are readily distinguishable from other marine
or other types of lights in the vicinity of built-up coastal
areas:
3) where they are the only lights of significance available.
2511 1104
No. 53
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 17.7.10.1 Areas that have not been surveyed for contour
the chart comprising shore lines, lakes, rivers and streams information shall be labelled "Relief data incomplete".
(including those non-perennial in nature), salt lakes, glaciers
and ice caps shall be shown. 17.7.10.2 Charts on which spot elevations are generally
unreliable shall bear a warning note prominently displayed on
17.7.6.2 Recon1mendation.- The tint covering large the face of the chart in the colour used for aeronautical
open water areas should be kept vely light. information, as follows:
Note.- A narrow band of darker tone may be used along "Warning - The reliability of relief information on this
the shore line to emphasize this feature. chart is doubtfil and elevations should be used with
.caution."
17.7.6.3 Recon~mendation.- Reefs and shoals, including
rocky ledges, tidaljlats, isolated rocks, sand, gravel, stone
and all similar areas should be shown by symbols when of 17.7.1 1 Escarpments
significant landmark value.
Recommendation.- Escarpments should be shown when
Note'- Groups of may be shown by represen- they are prominent landmarks or when cultural detail is vely
tative rock symbols within the area. sparse.
17.7.7 Contours 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 va.lues of the contours used shall be shown. northern or limits of tree growth may be
17.7.8 Hypsometric tints
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.
17.7.8.1 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 17.7.13 Date of topographic information
chart shall be shown in the margin.
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.
　
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