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GB 4696-1999 Aids to navigation in Chinese waters

Basic Information

Standard ID: GB 4696-1999

Standard Name: Aids to navigation in Chinese waters

Chinese Name: 中国海区水上助航标志

Standard category:National Standard (GB)

state:in force

Date of Release1999-05-31

Date of Implementation:2000-04-01

standard classification number

Standard ICS number:Shipbuilding and offshore structures>>Shipbuilding and offshore structures in general>>47.020.70 Navigation and control equipment Civil engineering>>93.140 Waterway and port structures

Standard Classification Number:Road and water transport>>Waterways and navigation aids>>R63 navigation aid installation and operation

associated standards

alternative situation:GB 4696-1984

Procurement status:IALA

Publication information

publishing house:China Standards Press

ISBN:155066.116122

Publication date:2000-04-01

other information

Release date:1984-10-05

Review date:2004-10-14

drafter:Zhang Guowei, Liang Yu, Zhang Xingping, Liu Yuyu

Drafting unit:Water Safety Supervision Bureau, Ministry of Transport

Focal point unit:Maritime Safety Administration of the Ministry of Transport of the People's Republic of China

Proposing unit:Ministry of Transport of the People's Republic of China

Publishing department:General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

competent authority:Ministry of Transport

Introduction to standards:

This standard specifies the shape, color, light quality, marking symbols and the requirements for the installation and use of floating buoys and fixed underwater markers in China's sea areas. This standard applies to floating buoys and fixed underwater markers set up by transportation, fishery, scientific research, petroleum exploration, marine development and military departments in China's sea areas and ports and sea estuaries. This standard does not apply to lighthouses, fan-shaped light beacons, guide beacons, lightships and large navigation buoys. GB 4696-1999 China's Sea Area Aids to Navigation GB4696-1999 Standard Download Decompression Password: www.bzxz.net

Some standard content:

GB 4696-1999wwW.bzxz.Net
This standard adopts the principle of Area A in the International Association of Navigational Aids (IALA) "Maritime Buoy System" and amends GB4696-84 in accordance with GB/T1.1-1993 "Standardization Guidelines Part 1: Drafting and Expression Rules for Aids Part 1: Basic Regulations for Aids Writing".
This standard makes a relatively large revision of GB4696-84 in the writing format, and tries to express the characteristics of aids to navigation in the form of tables to make it more intuitive and concise.
Since the contents of Appendix D and Appendix G of the original standard have been specified in GB16161-1996 "Regulations on the Shape Display of Aids to Navigation in China's Sea Areas" and GB/T17765--1999 "Terms of Aids to Navigation", they are deleted in this standard. This standard adds Chapter 1 "General Requirements", which further specifies the shape and size, light color and surface color of water aids to navigation in China's sea areas.
This standard shall come into effect on April 11, 2000. All water aids to navigation in China's sea areas shall comply with the provisions of this standard. This standard shall replace GB4696-84 from the date of implementation.
Appendix A, Appendix B, Appendix C and Appendix D of this standard are all appendices of the standard. Appendix E of this standard is a reminder appendix.
This standard is proposed by the Ministry of Transport of the People's Republic of China. This standard was issued by the Maritime Safety Administration of the Ministry of Transport of the People's Republic of China. The main drafting units of this standard are: Standard Planning Research Institute of the Ministry of Transport, Maritime Safety Administration of the Ministry of Transport, Guangzhou Maritime Safety Supervision Bureau of the Ministry of Transport. The main drafters of this standard are: Zhang Guowei, Liang Yu, Zhang Xing, Liu Yuyu. This standard was issued by the Maritime Safety Administration of the Ministry of Transport of the People's Republic of China. 425
1 Scope
National Standard of the People's Republic of China
Maritime buoyage system, ChinaGB4696—1999
Replaces GH469684
This standard specifies the shape, color, light quality, marking symbols and the requirements for the installation and use of floating buoys and fixed underwater markers in China's maritime areas.
This standard is applicable to floating buoys and fixed underwater markers installed in China's maritime areas and ports by departments such as transportation, fishery, science and technology, petroleum exploration, marine development and military. This standard does not apply to lighthouses: fan-shaped light beacons, guide beacons, lightships and man-shaped navigation buoys. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. The versions shown are valid at the time of publication of this standard. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB12708—1991 Colors of navigation light signals GB16161-1996 Regulations on the shape and display of water navigation marks in China's sea areas GB17381-1998 Regulations on the surface colors of visual navigation marks in China's sea areas 3 Definitions
This standard adopts the following definitions:
3.1 Conventional direction of buoyage The conventional direction of buoyage is the reference used by ships to determine that the channel is on the right when they are navigating along the channel of a river or estuary, that is, the conventional direction of the buoy system. The regulations are as follows: a) the direction of approaching or entering a port, estuary, harbor or other waterway from a seamount; b) in the open sea, strait or waterway between islands, in principle, it refers to the direction of sailing clockwise around the continent; c) in complex environments, the direction of the channel is stipulated by the navigation authority and marked on the nautical chart with "".
3.2 Left side of the channel, right side of the channel When a ship is sailing along the channel, its left side is the channel side, and its right side is the channel side. 3.3 Offshore fixed marks are navigation aids such as upright marks and light posts set in the water. The elevation of the mark point is below the local average high tide level, and the base or body of the mark is partially submerged by the average high tide level. If the function is the same as that of a buoy, its color, top mark and light shall be consistent with the corresponding buoy or light buoy. 3.4 Buoy shapes
The appearance features of the part of the buoy body above the waterline when observed from any horizontal direction on the water: 3.5 Top marks
One or two marks with a certain size, shape and color on the top of the navigation aids, 3.6 New dangers
Newly discovered obstacles that are not specified in the navigation data, such as shoals, reefs, sunken ships, etc. Approved by the State Administration of Quality and Technical Supervision on May 31, 1999 426
Implementation on April 1, 2000
4 Side marks
GB 4696--1999
Surface marks are distributed according to the direction of the channel and are used to mark the boundaries of both sides of the channel; or to mark the recommended channel, or to mark a specific channel. The navigation mark includes the left side mark, right side mark and the recommended left side mark and right side mark of the channel. 4.1 Channel left mark and right side mark
4.1.1 The left and right side marks are respectively set on the left and right sides of the channel to indicate the left and right boundaries of the channel. Ships sailing along the direction of the channel should place the left and right side marks of the channel on the left and right sides of the ship. As shown in Figure 1. X
MAAAAAAAMAAAMAAAA
Draw the left side mark of the channel, layout of the side mark
4.1.2 The characteristics of the left side mark and the side mark of the channel should comply with the provisions of Table 1. Table 1
Left side mark of navigation
Shape. Or a column or rod with a top mark
single red shape
red light, single, cycle 45
red light, flashing twice, cycle 6*
red light, flashing three times, cycle 10%
red light, continuous fast flash
4.2 Recommended channel left side mark, with side mark
channel stone side mark
row shape, or column or rod with a single green shape, cone top upward
green light, single. Cycle 4s
green light, flashing twice, cycle 6s
green light, flashing three times, cycle 105
green light. Continuous flash
4.2.1 The left and right side marks of the recommended channel are set up at the bifurcation of the channel, and can also be set up in a specific channel. When a ship is navigating in the active channel, the left side mark of the recommended channel indicates that the recommended channel or the specific channel is on its right side: the right side mark of the recommended channel indicates that the recommended channel or the specific channel is on its abandoned side: as shown in Figure 2,
Recommended channel on the side mark
GB 4696--1999
2+1112
Figure 2 Recommended channel left side mark, right side mark
4.2.2 The characteristics of the left and right side marks of the recommended channel shall comply with the provisions of Table 2. Table 2
5 azimuth mark
Recommended channel left mark
Red, with a wide horizontal strip of green in the middle
Can shape: column or punch shape with top mark
Single red otter shape
Red light, mixed flash 2 times plus 1 time, cycle 6s red light, mixed flash 2 times plus 1 time, cycle 9s red, ratio, mixed flash 2 times plus 1 time. Cycle [2 s Promote navigation with innovative standards
Recommended channel with side mark
Green, with a wide horizontal strip of red in the middle
Antimony shape: column with top mark formed into a rod shape
Single color cone shape: cone top facing up
Green light. Mixed flash 2 times, 6s green light, mixed flash 2 times, 95
married light, combined flash 2 times, 12s period, azimuth mark is set in the four quadrants of north, east, south and west with dangerous objects or dangerous areas as the center, that is, true azimuth northwest ~ northeast northeast-southeast, southeast ~ southwest, southwest ~ northwest, and named as north mark, east mark, south mark and west mark in the corresponding quadrant, respectively indicating that the navigable waters are on the same side of the mark. Azimuth mark can also be set at the turning of the channel, the junction of branches or the terminal of the shoal,
5.1 The north mark is set in the north of the dangerous object or dangerous area, and the ship should pass in the north of this mark: the east mark is set in the east of the dangerous object or dangerous area, and the ship should pass in the east of this mark; the south mark is set in the south of the dangerous object or dangerous area, and the ship should pass in the south of this mark; the west mark is set in the west of the dangerous object or dangerous area, and the ship should pass in the west of this mark. The orientation marks are shown in Figure 3,
5.2 The characteristics of the azimuth mark should conform to the specified characteristics in Table 3. The north azimuth mark is black on the top and yellow on the bottom. The top of the cone is expected to face upward light, and will flash very quickly. Continuous quick flash
G ball 4696-1999
Figure 3 Direction mark
East direction mark
black, with a wide yellow strip in the middle
Column or rod-shaped with a mark
Two cones vertically arranged above and below rotate
The bottom of the cones are relatively
self-lighting, flashing very quickly 3 times in a row,
cycle 5s
self-lighting, flashing quickly 3 times in a row,
cycle 105
South direction mark:
yellow on top and black on the bottom
The tops of the cones are both downward
white light, flashing quickly 6 times in a row
extended flash, cycle 10
white light, flashing quickly 6 times in a row plus
a long flash. Period 15 3
West position marker
Yellow, with a black
wide horizontal band in the middle
Chain top relative
White light, flashing 9 times in a row,
Period 10s
Self-light, flashing 9 times in a row,
Period 15s
Isolated Danger Mark
GB 46961999
Isolated Danger Mark is set or moored on an isolated dangerous object, or as close to the dangerous object as possible, marking the location of the isolated dangerous object. Ships should refer to navigation data and navigate away from this mark. 6.1 The location of the fox dangerous object mark is shown in Figure 4.
Figure 4 Isolated Danger Mark
6.2 The characteristics of the isolated dangerous object mark should comply with the specifications in Table 4. Table 4
Safety waters sign
Isolated color danger mark
Black, with one or several red wide horizontal bands in the middle, equipped with a warning mark or a support
Two vertical black spheres
White light. Flashing twice, period 58
Safety waters sign is set in the center of the channel or on the center line of the channel, indicating that the surrounding area is navigable waters; it can also replace the direction mark or side mark to indicate the approach to land.
7.1Safety water sign is shown in Figure 5.
Figure 5Safety water sign
CB 4696-1999
7.2The characteristics of safety sign shall comply with the provisions of Table 5. Table 5
8 Special signs
Red and white tight tea
Safety and area signs
Spherical, or column or rod with right top mark Single red spherical
H light, equal brightness. Period 45
Self-light, long flash, width 10 s
North, Moiré signal "A\, period 63
Special signs are signs used to mark specific waters or water city features. Special signs are shown in Figure 6.
Figure 6 Special signs
The characteristics of special signs should comply with the provisions of Table 6, and the special signs
Special signs
Any shape that does not conflict with buoys and fixed signs in the water is yellow, a single "" shape
Comply with the provisions of Table 7
8.3 Special signs are divided according to their purpose, main It should include the following seven categories: a) Anchorages for ship mooring and quarantine anchorages, etc.: e2
b) Prohibited navigation areas, military exercise areas, etc.:
c) Offshore operation areas, ocean data detection, channel measurement, hydrological testing, diving, salvage, marine development, mud dumping areas, speed measurement fields, annual plate correction fields, etc.:
d) Separate traffic lanes, separate traffic lanes, separation strips, etc., when the use of conventional Sri Lankan navigation signs to indicate separate traffic lanes may cause confusion, 431
may be used;
GB 4696—1999
) Water structures, cables, pipelines, water inlets, water outlets, etc.: f) Entertainment areas, sports training areas, offshore entertainment venues, etc.;) Aquatic operation areas, aquatic fixed net operation areas and aquaculture soups, etc. 8.4 Special signs should be marked with a mark indicating their purpose in a conspicuous place on the sign body, and should be visible from any water\ side when observing on the water. The specific regulations are listed.
Type of use
Prohibited breeding area
Offshore industrial area
Separate navigation
Simulated underwater structures
Entertainment area
Production operation area
Red/white
Note: *15# is the standby period.
Graphic logo
Flash rhythm
Morse signal: "Q\
Morse signal"P\
Morse signal"O\
Morse signal"K\
Morse signal"C\
Morse signal"Y"
Morse signal"
Period (s)
8.5 In special circumstances. When the seven uses of special signs listed in this standard exceed the seven uses, the quality of the light and the mark may be determined separately with the approval of the navigation aids administration.
9 Marking of new dangerous objects
9.1 Method of marking new dangerous objects
9.1.1 When the navigation aids administration considers that a new dangerous object seriously endangers the navigation safety of ships, it should set up a sign to indicate it as soon as possible. 432
GB 4696—1999
These signs can be azimuth signs or side signs, and the lighting rhythm is basic fast flash or fast flash. At the same time, there should be at least one repeated sign among these signs, and all its features should be the same as the sign it is paired with. 9.1.2 New dangerous objects can be marked by radar transponders, and an image equivalent to 1nmile in length will be displayed on the radar screen, and its shortened code is the Morse signal "D" (—). 9.2 Removal of repeated signs of new dangerous objects
After the navigation aid management authority confirms that the information of the new dangerous object has been fully notified, its repeated signs can be removed and the normal navigation aids can be restored
10 General requirements
10.1 The shape and size of the marine aids to navigation in the sea area listed in this standard shall comply with the relevant provisions of GB16161. 10.2 The light color of the marine aids to navigation in the sea area listed in this standard shall comply with the relevant provisions of GB12708: the light quality shall comply with the provisions of Appendix A (Appendix to the Standard) of this standard. 10.3 The surface color of the aids to navigation in waters listed in this standard shall comply with the relevant provisions of GB17381; the coloring method shall comply with the provisions of Appendix B of this standard (Appendix to the standard). 10.4 The numbering of the aids to navigation in waters listed in this standard shall comply with the provisions of Appendix C of this standard (Appendix to the standard). 10.5 The legend of the aids to navigation in waters listed in this standard shall comply with the provisions of Appendix D of this standard (Appendix to the standard). 10.6 The layout and chart style of aids to navigation in waters in waters shall refer to the schematic diagram in Appendix E of this standard (Appendix to the standard). 433
GB 46961999
Appendix A
(Appendix to the standard)
Light quality and use of aids to navigation in waters in waters The light quality and use of aids to navigation in waters listed in this standard shall comply with the provisions of Table A1. Table A1
single flash, period 4s
light rhythm and period
bright 0.5s (03 s ), compensated 35 s (3.7 s) flash twice, period 66
bright U.5s dark 1 bright 05 s, dark 4 s
flash three times, period 10 6
bright 0.5 5, dark 1 5, bright 0.5 s, dark 1 s, bright 0.5 s, dark 6.5 5 flash twice, period 5B
bright 0.5 8, aiming 1 s, bright 0.5 s. dark 3 9
equal brightness and darkness, period 4 s
bright 22 s dark 2 S
long flash, period 10 s
bright 2 5. dark 8 5
Mixed connection 2 times plus 1 time, cycle 6s
0.5 s on, 0.5 s off. 0.5 5 on, 8 on, 0.5 s on, -3 s mixed flash 2 times plus 1 time, period 9$
on 1.5 s. dark 0.5 5, on 0.5 s, dark 15 5 on 0.5 5, 5.5 s mixed flash 2 times plus 1 time, period 12 5
on 1s, dark 1 $, on 1 8, dark 2s, on 1 s, dark 6 Continuous fast flash
Continuous very fast flash
mixed fast flash 3 times, period 10 5
fast flash 3 times on and then 7.5 s
mixed fast flash 3 times, period 5s
fast flash 3 times on and then dark 3.755
mixed fast flash 6 times plus 1 long flash, period 15 s
fast flash 6 times on and then dark 0.5 s, 2 s on, 5 s off, 6 fast flashes plus 1 long flash, period 10s
very fast flash 6 times on, 025s, 2s on, 5s off, 9 fast flashes on, period 15 5
fast flash 9 times on, 6.5s off on, 9 fast flashes on, period 106
very fast flash 9 times on, 5s off.75 8
Morse Sovereign
Short light (dot) 0.5 The duration of darkness between two lights is equal to the dot, and the duration of long light (dash) is three times of the dot
Applicable signs and light positions
Left side mark, red light;
Right side mark, green light
Use·Secondary waterway
Township dangerous goods mark, white light
Safe water city mark, white light
Recommended waterway left side mark, red light
Recommended waterway right side mark. Green light
Left side mark, red north:
with side mark, green light;
north position mark, national north
north position mark, light
east position mark,
south position mark, white light
west position mark, white light
sann umbrella waters mark. Mouth light;
special mark, yellow light
GB 46961999
Appendix B
(Standard Appendix)
Surface color method of water navigation aids in sea areas B1 General color method of single color buoy
For all -color marks, i.e. left side mark, right side mark, special mark, no matter what shape, the part above the waterline and the top mark of the mark body are the same color, i.e. the left side mark is red, the side mark is green, and the special mark is yellow. Special markings on special marks: marked on the lighthouse sign board or in a conspicuous place on the mark body according to the provisions of Table 7. B2 Division and coloring method of bands and stripes of buoys with two colors alternately B2.1 Division method of horizontal color bands on the mark body
B2.1.1 Equal division method, applicable to the south and north mark. The mark above the waterline of the pole-shaped buoy is divided equally, from top to bottom, called the upper section and the lower section. The section above the waterline to the top surface of the float of the buoy is called the lower section; the lighthouse is a section, called the upper section. B2.1.2 The three-equal division method is applicable to the left side mark of the recommended channel, the right side mark of the recommended channel, the isolated dangerous object mark, and the east and west position marks. The body of the tank-shaped, cone-shaped or pole-shaped buoy above the waterline is divided into two equal parts, from top to bottom, the upper part is the upper section, the middle section, the lower section, and the column-shaped buoy above the waterline to the buoy body is the lower section. The upper section is above the upper edge of the horizontal board of the light frame, and the middle section is between the upper and lower sections. B2.2 Coloring of the horizontal color band of the body
B2.2.1 The left side mark of the recommended channel: the upper and lower sections are red, and the middle section is green. B2.2.2 The right side mark of the recommended channel: the upper and lower sections are green, and the middle section is red. B2.2.3 The isolated dangerous object mark: the upper and lower sections are black, and the middle section is red. When the pole-shaped buoy is used as an isolated dangerous object mark, the mark above the waterline can also be divided into five equal sections from top to bottom. The first, third and fourth sections are all red, and the fourth and fourth sections are red.
B2.2.4Northern position mark: upper black, lower yellowB2.2.5Eastern position mark: upper and lower black, middle yellow. B2.2.6Southern position mark: upper yellow, lower black, B2.2.7Western position mark: upper and lower yellow, middle black, B2.3Method of dividing the longitudinal color stripes of the mark body
B2.3.1The mark body above the waterline of the pole-shaped buoy is divided into four equal longitudinal stripes. B2.3.2The mark body above the waterline of the spherical buoy is divided into eight equal longitudinal stripes. B2.3.3The waterline of the columnar buoy is divided into six or eight equal longitudinal stripes [according to whether the light frame is a triangle or a quadrilateral]. Each side of the light channel is divided into two longitudinal strips, which are connected to the color stripes of the buoy. B2.4Coloring of the longitudinal color stripes of the mark body
Safety water city mark: red and white alternately.
B3 Other requirements
For the coloring of fixed underwater signs (standing signs, light posts and articulated light posts) subject to this standard, the part above the waterline of the sign body (meaning the average high tide and commercial tide) shall be processed in accordance with the coloring of the corresponding pole-shaped buoy: for the signs with segmented colors, the coloring of the lowest section shall be extended as far downward as possible from the average high tide level. 435
GB 4696—1999
Appendix ℃
(Appendix to the recommendation)
Numbering of marine aids to navigation in sea areas
C1 When more than two marine aids to navigation are set up in an area, they should be numbered for the convenience of identification and management. C2 The sign numbers should be arranged in the order of the direction of the waterway. C3 Different waterways can be numbered separately. The sign numbers of the same waterway can be arranged in sequence continuously, or in double on the left and single on the right. If different waterways need to be distinguished, the first letter of the Chinese pronunciation of the waterway name or place name can be placed before the number. C4 The numbering shall be in Arabic numerals and marked on the top plate of the buoy or the sign board of the lighthouse. The numbers shall be in Arabic numerals. The letters should be in standard boldface and the writing should be clear and distinct. The color of the number should be white on red, green and black backgrounds, and black on yellow and white backgrounds. When there are additions or reductions in the signs in the C5 tunnel, the numbers of other signs can remain unchanged after the reduction. For added signs, the code of the previous sign can be temporarily used and a number can be added after it. For example, when a sign is added between signs 13 and 14, the number of the new sign is "13-1", and so on. When the signs change too much and become inconvenient to use, they should be renumbered. C6 pole-shaped signs do not need to be numbered because of their small body. C7 fixed underwater signs are generally not numbered, but can be numbered when set continuously. 4364 Coloring of the vertical stripes on the body
Safety water city mark: red and white alternately.
B3 Other requirements
For the coloring of fixed underwater marks (standing marks, light posts and movable light posts) subject to this standard, the part above the waterline of the mark body (meaning the average high tide and commercial tide) shall be treated in accordance with the coloring of the corresponding pole-shaped buoy: for the segmented color marks, the coloring of the lowest section shall be extended as far downward as possible from the average high tide level. 435
GB 4696—1999
Appendix ℃
(Appendix to the recommendation)
Numbering of marine aids to navigation in sea areas
C1 When more than two marine aids to navigation are set up in an area, they should be numbered for the convenience of identification and management. C2 The sign numbers should be arranged in the order of the direction of the waterway. C3 Different waterways can be numbered separately. The sign numbers of the same waterway can be arranged in sequence continuously, or in double on the left and single on the right. If different waterways need to be distinguished, the first letter of the Chinese pronunciation of the waterway name or place name can be placed before the number. C4 The numbering shall be in Arabic numerals and marked on the top plate of the buoy or the sign board of the lighthouse. The numbers shall be in Arabic numerals. The letters should be in standard boldface and the writing should be clear and distinct. The color of the number should be white on red, green and black backgrounds, and black on yellow and white backgrounds. When there are additions or reductions in the signs in the C5 tunnel, the numbers of other signs can remain unchanged after the reduction. For added signs, the code of the previous sign can be temporarily used and a number can be added after it. For example, when a sign is added between signs 13 and 14, the number of the new sign is "13-1", and so on. When the signs change too much and become inconvenient to use, they should be renumbered. C6 pole-shaped signs do not need to be numbered because of their small body. C7 fixed underwater signs are generally not numbered, but can be numbered when set continuously. 4364 Coloring of the vertical stripes on the body
Safety water city mark: red and white alternately.
B3 Other requirements
For the coloring of fixed underwater marks (standing marks, light posts and movable light posts) subject to this standard, the part above the waterline of the mark body (meaning the average high tide and commercial tide) shall be treated in accordance with the coloring of the corresponding pole-shaped buoy: for the segmented color marks, the coloring of the lowest section shall be extended as far downward as possible from the average high tide level. 435
GB 4696—1999
Appendix ℃
(Appendix to the recommendation)
Numbering of marine aids to navigation in sea areas
C1 When more than two marine aids to navigation are set up in an area, they should be numbered for the convenience of identification and management. C2 The sign numbers should be arranged in the order of the direction of the waterway. C3 Different waterways can be numbered separately. The sign numbers of the same waterway can be arranged in sequence continuously, or in double on the left and single on the right. If different waterways need to be distinguished, the first letter of the Chinese pronunciation of the waterway name or place name can be placed before the number. C4 The numbering shall be in Arabic numerals and marked on the top plate of the buoy or the sign board of the lighthouse. The numbers shall be in Arabic numerals. The letters should be in standard boldface and the writing should be clear and distinct. The color of the number should be white on red, green and black backgrounds, and black on yellow and white backgrounds. When there are additions or reductions in the signs in the C5 tunnel, the numbers of other signs can remain unchanged after the reduction. For added signs, the code of the previous sign can be temporarily used and a number can be added after it. For example, when a sign is added between signs 13 and 14, the number of the new sign is "13-1", and so on. When the signs change too much and become inconvenient to use, they should be renumbered. C6 pole-shaped signs do not need to be numbered because of their small body. C7 fixed underwater signs are generally not numbered, but can be numbered when set continuously. 436
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