Some standard content:
GB/T 17B33—1999
This standard was formulated with reference to the International Hydrographic Organization (IHO)'s IHO Chart Specifications and IHO International Chart Regulations (1992) and GB12320—1998 "China Nautical Chart Compilation Specifications". This standard was formulated in accordance with GB/T1.1—1993 "Guidelines for Standardization Work Unit 1: Drafting and Expression Rules for Standards Basic Provisions for the Compilation of Standards".
This standard is used in conjunction with GB12319—19984 "China Nautical Chart Diagram 3". Part 1: Standards
This standard shall be implemented from April 1, 2000. All fishery charts published from April 1, 2000 shall comply with the provisions of this standard.
This standard was proposed by the Navy Command:
This standard is under the jurisdiction of the Navigation Assurance Department of the Navy Command. This standard was drafted by the Navy Press. The main drafters of this standard are Yu Yuantong, Lv Chunwu, Wang Jie, Jia Jianjun, Li Jinjie, Zhao Xiuying and Yuan Jiansheng. This standard is entrusted to the Navigation Assurance Department of the Navy Command for interpretation. 1 Scope
National Standard of the People's Republic of China
Specifications for the compilation of fishery charts
Speciflcations tor fishing chartsGB/T17833—1999
This standard specifies the mathematical basis, editing design, operation methods, and compilation requirements of various essentials for the compilation of fishery charts. The preparation for the printing and publication of fishery charts, as well as the proofreading, review, acceptance, and updating. This standard is applicable to the compilation of fishery charts of various scales. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB12319-15998 Chinese Nautical Chart Format
GB12320-1998 Chinese Nautical Chart Compilation and Drawing Specifications GB/T14477—1993 Nautical Chart Printing Specifications
3 Definitions
This standard adopts the following definitions.
3.1 Fishing Chart
Specialized nautical charts that reflect contents related to fishing ground operations and navigation, mainly used by fishing vessels for fishing ground operations and maritime navigation. 3.2 Horizontal Chart
A chart whose horizontal length is greater than the vertical length. (The opposite is a vertical chart.) 3.3 Overlap
The heaviest part of adjacent charts of the same scale or close scale. 3.4 Outline Size
The size of the outline in the chart.
3. 5 Compilation Scale
The scale used in the compilation and drawing of tourist charts. 3.6 Joint map
A map made up of two or more adjacent small maps in the mapping area. 3.7 Sub-map
A map made up of two or more non-adjacent small maps in the mapping area. 4 Requirements
4.1 Basic requirements
Fisheries maps should meet the needs of fishery operations, ensure navigation safety, and be easy to use. The specific requirements are as follows: 1) The content is mainly based on sea area elements, and detailed descriptions of fishery obstacles, protection areas, fishing moratoriums, fishing areas, fishing grounds, etc. related to fishery production. National Quality and Technical Supervision Bureau approved W2000-04-01 Implementation Standard
GB/T17833--1999
It should also include navigation obstacles, navigation aids, tides, and ocean currents. The land area should focus on coastal navigation targets and major landforms, and land features should be kept in good currentness. Cartographic data should adopt the latest achievements. When the sea area changes after publication, it should be updated in time. The relevant contents of basic navigation data such as nautical charts, route guides, navigation tables, tide tables, etc. in the same area should be unified and coordinated. 4.2 Operation accuracy
4. 2. 1 Accuracy of calculated display points,
a) The error of calculation is less than 0.1mm:
b) The error of the position of the display point is not more than 0.1mm;c) The error of the length of the inner map line, the distance between the points displayed on the map and the map of the Gaussian square network is not more than 0.2mmsd) The error of the diagonal length of the map is not more than 0.3mm, and the absolute value of the difference between the two diagonal lengths is less than 0.4mm. 4.2.2 After the compilation and drawing of various elements of the original map is completed, except for the displacement according to the principle of cartographic integration, the map position should meet the following requirements: a) The position deviation of the water depth annotation is not more than 0.3mm; b) The position deviation of the point element is not more than 0.2mm; c) The position deviation of the linear element is not more than 0.3m. 4.2.3 The accuracy requirements for the compilation and engraving or compilation and drawing are the same as those in 4.2.2. 4.2.4 When the manuscript method is used to draw the map, the engraving (or clearing) accuracy of the elements of the printed original map is compared with the compiled original map: a) The position deviation of the point element is not more than 0.2mm; b) The position deviation of the linear element is not more than 0.3mm; 4.2.5 When using computer mapping, the accuracy of digitization, data deformation processing and other operations should not be lower than the requirements of 4.2.2.
4.2.6 When using various operation methods to map, the error of the original map illustration, linear scale, and grid length of the fishery map should not be greater than 0.2mm compared with the theoretical size. The subdivision error should not be greater than 0.2mm. The error of the diagonal length of the map sheet should not be greater than 0.3mm: the absolute value of the difference between the two diagonals should not be greater than 0.5mm. 5 Mathematical basis, division, and numbering
5.1 Mathematical basis
5. 1. 1 Coordinate system
5.1.1.1 The WGS-84 world geodetic coordinate system is used. If the mapping data uses other coordinate systems, the coordinate conversion should be performed when compiling 1*1 million and larger scale maps. 5.1.1.2 If the coordinate system of the mapping data cannot be converted to the WGS-84 world geodetic coordinate system, the coordinate system of the data with the largest map area or the main elements can be used.
5.1.1.3 When compiling maps with a scale greater than 1:1 million, the name of the coordinate system should generally be noted. Except for maps using the WGS-84 World Geodetic Coordinate System, an alternative note should be noted on the map, "The coordinate system used in this map is somewhat different from the WGS-84 World Geodetic Coordinate System. Please note this when using it."
5. 1.2 Scale
The scale of fishery maps should be determined according to actual needs and rounded appropriately. China's coastal areas generally only compile fishery maps with a scale of 1.50 square meters, 1:1 million, and 12 million, and try to make regional sets of scales consistent. Individual maps can be adjusted appropriately within a certain range. In some special areas, fishery maps with a scale greater than 1.5 million or less than 1:2 million can also be compiled. 5.1.3 According to the projection
5.1.3.1 The Mercator projection is generally used. The complete set of fishery maps uses the latitude of the mapping area as the reference latitude, and the rest of the maps use the latitude of this map as the reference latitude. The reference latitude is taken to the whole minute or whole degree. 5.1.3.2 When the latitude of most areas in the mapping area is higher than 75*, the solar projection is generally used. 5.1.4 Depth datum
GB/T 17833—1999
5.1.4.1 The theoretical lowest tide level is used along the coast of China, and the depth datum of the original data is used in the open sea and foreign sea areas. 5.1.4.2 The unit of measurement for depth is meter.
5.1.5 Height datum
5.1.5.1 Mainland China generally uses the "1985 National Height Datum" or the local average sea surface as the height datum + Hong Kong, Macao, Taiwan and foreign regions use the height datum of the original data.
5. 1.5. 2 If the height datum of the data is inconsistent, it is generally not recalculated. When a map uses more than two elevation datums, the main one should be mentioned in the title.
5.1.5.3 The unit of measurement for the route is meter.
5. 2 Frame division
5.2.1 Chart sheet size
The chart sheet size for fishery maps is generally designed to be 680mm×450mm (opening) or 980mm×680mm (full opening). Under special circumstances, the size of the chart can be enlarged by 10~20mm.
5.2.2 Principle of frame division
The basic principle of frame division is to try to reduce the number of chart sheets while meeting the needs of fishery operations, ensuring navigation safety and convenience of use. 5.2.3 Specific requirements for sub-maps
a) Keep the theme field in the map of the region relatively complete, and try to avoid splicing in complex areas; b) The sea-land line should be kept as continuous as possible, and the ratio of sea and land areas in the map should be appropriate. Generally, the land area should not be greater than one-third of the map area;
c) The same scale map is not required to be a set within the national scope; d) The overlap width between adjacent maps of a set of maps should be kept at about 100mm, but it can be appropriately reduced in the vast and flat offshore area, and even connected side by side!
e) The map is designed as a horizontal map as much as possible, and a vertical map can be designed if necessary: the map form is mainly a folio map, and the main attached map, spliced map and sub-maps are generally not made.) When the navigation aids and significant landmarks that are of special significance to navigation cannot be shown within the inner map line, they can be shown in the map gallery or drawn outside the map: If it is still impossible to show it outside the map, the target direction guide line outside the map can be marked as needed. 5.3 Numbering
5.3.1 Basic provisions
5.3.1.1 Maps with a scale greater than 110 million shall be numbered with a five-digit number preceded by "F". 5.3.1.21 Maps with a scale of 10 million or less shall be numbered with a three-digit number preceded by *F*. 5.3.2 Numbering significance
5.3.2.1 Numbering of maps with a scale greater than 1:10 million Meaning: =) The first digit represents the world division number (the world division number is specified in Appendix A of GB12320-1998) b) The second and third digits represent the scale interval. For example, the numbers *02"*05\ respectively represent the scale of 1.2 million and 1:500,000, and the rest can be deduced accordingly. + The numbers 10""20\ respectively represent the scale of 1.1 million and 112 million, and the rest can be deduced accordingly. c) The fourth and fifth digits represent the geographical sequence of the country. 5.3.2.21110 million and smaller scale fishery map numbering meaning,) the first digit represents the scale interval. For example, the number "1\ represents the scale of 1:1 000 square level, the number "2\ represents the scale of 1120000 level, and the miscellaneous ones are deduced by analogy
b) The second and third digits represent the geographic sequence number of the map sheet. 5.3.3 Geographical sequence
5.3.3.1 Geographical sequence numbers are generally arranged in the direction of the Chinese mainland or islands. 5.3.3.2 All national maps that cross China's territorial waters or adjacent sea areas, regardless of the proportion of their area, are numbered according to the sequence number of China's sea areas. 6 Editing and design
6.1 Contents of editing and design work
GB/T 17833—1999
In addition to determining the mathematical basis, division and numbering of the new map according to the provisions of Chapter 5, the editing and design work of fishery maps mainly includes the following contents:
a) Research on the mapping area
b) Analysis and selection of mapping data:
c) Determination of map configuration;
d) Preparation of editing plan.
6.2 Research on the mapping area
6.2.1 The focus of the research on the mapping area is the characteristics of various phenomena related to fishing ground operations and navigation in the mapping area and their mutual relationship, so as to better reflect them in the map. 6.2.2 The main contents of the research on the mapping area: a) Natural characteristics: including the nature and shape of the coast, the nature and undulating form of the dry beach, the characteristics of the seabed landforms, the characteristics of the currents and tides, the basic form of the coastal landforms, etc.;
b) Human characteristics: including the division of settlements, water and land transportation conditions, etc.; c) Navigation characteristics: including the distribution of ports, the types of ports, etc. and scale, the completeness of port facilities, and the distribution of waterways, anchorages, shelters, navigational daymarks, and navigational obstacles, etc.; d) The operating environment of the fishing grounds, including various fishing bans and rest periods. The distribution of fishing grounds and fishing areas, as well as the operating conditions of the fishing grounds, etc. 6.3 Analysis and selection of cartographic data
6.3.1 Types of cartographic data:
a) Control survey data, including the results of various control points; d) Sea survey data: including the water depth and coastal terrain measured by the seaway survey team and other professional survey teams; Results, appraisal of results and obstacle exploration list, etc.:
c) Mapping data include various maps, sea charts, atlases, atlases, etc.; d) Remote sensing image data: including aerial photogrammetry data and satellite synesthesia data; e) Other data: including various text data and picture data, etc. 6.3.2 Analysis of Cartographic Data
Cartographic editors should conduct a comprehensive and careful analysis of various data, focusing on the current situation, completeness, geographical adaptability, accuracy, possibility of replication, etc. of the data.
6.3.3 Selection of Cartographic Data
After the data analysis work is completed, a decision should be made on whether to adopt it, and the adopted data should be divided into basic data, supplementary data and reference data according to the degree of use, and the scope and content of their respective use should be determined. 6.3.3.1 Basic data should generally meet the following requirements: a) strong currentness, complete content, high accuracy, and reflect the true and reasonable content; b) the scale is greater than or equal to the scale of the map; c) the projection is the same as the newly compiled nautical chart or the shape of the longitude and latitude lines is similar; d) it is easy to copy and redraw.
6.3.3.2 The selection of basic data should be in accordance with the following specific provisions: a) When compiling fishery maps for Chinese sea areas, the latest survey data or the latest published basic data of marine surveys by the Navigation Guarantee Department of the Chinese People's Liberation Army Navy Command should generally be used:
5) When compiling fishery maps for foreign sea areas or when the mapping area spans between China and foreign sea areas, Chinese surveying and mapping data are generally preferred in Chinese sea areas, and foreign data with strong currentness are used in foreign sea areas. Foreign sea areas use foreign nautical charts or Chinese nautical charts. 6.4 Map Configuration
GB/T17833—1999
Configure the title in the appropriate position of the map, and configure the tide signal table, tidal current table, radio navigation facility table, static chart, route reference chart and relevant navigation, fishery conditions and fishery laws and regulations according to needs and possibilities. 6.4.1 Title
The content of the title includes the micro-announcement of the publishing agency, the geographical location of the country, the map name, scale, projection, coordinate system, datum and measurement unit of depth and elevation, diagram adoption and map compilation data description, etc. 6.4.2 Geographical Location Description of the Map
The text of the geographical location description should be concise and clear, consisting of one to three groups of notes, generally taking the name of the sea and the island, archipelago, peninsula, bay, etc., and the name of the country to which it belongs is added before the name. For example, "Liaodong Peninsula, Yellow Sea, China" will no longer be marked on the map when the scale is less than 1.2 million or the geographical location is not suitable for annotation. 6.4.3 Map name
The map name should clearly indicate the scope of the map.
a) Maps of 1.1 million scale and smaller are generally named with the name of the ocean area plus "fishing ground map", such as "Chaohai and northern Yellow Sea fishing ground map".
b) Maps of 1.1 million scale are generally named with the name of the sea area in the main area of the map plus "fishing ground map" or the name of the fishing ground, such as "fishing ground map near the Pearl River Estuary" or "Zhoushan fishing ground and vicinity". 6.4.4 A connecting chart should be placed outside the map outline (in the center of the gap between the mountain plate mechanism and the supplementary symbol). Its specifications are generally 13mm×9mm, indicating the adjacent relationship of fishery maps of the same scale. 6.5 Editing plan and calendar
6.5.1 The editing plan is the design result of the map sheet editor. It is the guiding document for the editing and mapping operation formulated by the map sheet editor according to the provisions of this specification and combined with the specific conditions of the map sheet. It is compiled by the map sheet editor and recorded in the calendar. 6.5.2 The basic contents of the editing plan are:
a) Geographical overview of the mapping area, the overview of the main fishing grounds and navigation characteristics; b) Basic information of the mapping data, including name, version, number, scale, projection, coordinate system, depth and elevation datum, measurement unit and time, time of publication, reprint and minor correction, etc.;) The degree and sequence of use of various mapping data. The supplementary content and reference scope of the supplementary data and reference data should be specified. d) The working method of mapping, the specific requirements and precautions for cartographic synthesis; e) Specific provisions for place names and other notes; f) The starting time, issue number and item number of navigation notices; %) Various attachments, including map configuration diagrams, title content and text arrangement format, etc. 6.5.3 The records in the chart and calendar table should be detailed, accurate and complete, and signed by the person who filled in each item. The chart and calendar table should be archived. 7. Compilation and drawing work method
7.1 Basic operation methods
a) Computer editing method, input the drawing data into the computer, perform data processing and editing, and then output the printing plate film or printing plate through the publishing system.
b) Editing method, first make the editing original on the plate or film, and then use the engraving method or the clear drawing method to make the printing original. The printing original made by the engraving method is generally divided into line drawing plate, annotation plate, and general dyeing tear film plate. The printing original made by the clear drawing method is generally a full-element plate.
c) Joint editing and engraving (or joint editing and drawing) method: editing, engraving (or clear drawing) are completed on the same film (or plate), and the result is the printing original. The joint editing and engraving method is generally engraved according to the printing color of the line drawing, and the annotation plate and tear film plate are made separately; while the printing original of the joint editing and drawing method is a full-element plate.
7.2 Calculation and display of mathematical basis
GB/T 17833 — 1999Www.bzxZ.net
In the process of conventional compilation and drawing, the map of fishery, latitude and longitude grid, linear scale, control grid (points) for transfer data, and control grid (points) for coordinate system conversion should be calculated and displayed. The number of points calculated and displayed should ensure the mapping accuracy and facilitate average subdivision. 3 Processing and transfer of mapping data
7.3.1 Processing of mapping data
The survey result plates or mapping data selected as mapping data should be properly processed according to the specific situation before reproduction, so that they are suitable for reproduction and transfer.
7.3. 1.1 When the mapping grid on the data is inconsistent with the one displayed on the original map, or the grid on the data is too large to be transferred, a grid should be added to the mapping data. When adding drawings, attention should be paid to the projection properties of the data and the shape characteristics of the mapping network, and curves should not be connected into straight lines. 7.3.1.2 When the scale of the mapping data is 3 times (inclusive) or more than the mapping scale, an intermediate original map should be prepared when using conventional mapping methods. The methods are:
) Transparent material marking method: When the data elements are relatively simple, use transparent film or other transparent materials to cover the data, enlarge the lines and symbols at a certain ratio to mark the elements required for the new mapping, and then copy and reduce them according to the mapping scale after a comprehensive inspection: b) Blueprint drawing method: When the data is relatively complex, first copy and reduce the data according to an appropriate scale, and then develop a blueprint for drawing: The intermediate original map is then copied and reduced according to the mapping scale. 7.3.2 Re-drawing of mapping data
7.3.2.1 Commonly used re-drawing methods and requirements for basic data a) Graphic digitization method, the re-drawing accuracy should meet the requirements of 4.2; b) Polyester film projection method. The accuracy of the transfer should meet the requirements of 4.2 c) Blueprint (or brown map) key embedding method. After embedding, there should be no overlap, cracks should not exceed 0.2mm, the error of control points and intersection points of the mapping network should not exceed 0.1mm, and the straight line deformation arrow length should not exceed 0.2mm; d) Direct blueprinting method. It is used when the projection of the data is the same as the new map, its scale is the same as or very close to the new map, and the content of the data basically meets the requirements of the new map. 7.3.2.2 For the transfer of small-area supplementary data, the data is generally scaled to the mapping scale first, and then copied to the original. 23 common transfer methods and requirements are listed) Coordinate value input method. When using computer mapping, the control points, important navigation aids and obstacles with coordinate value data should be directly input into the coordinate values, and the graphic digitization method should generally not be used; b) Latitude and longitude recording method. It is required that the data is completely consistent with the standard system of the new map, c) Azimuth distance method. The data and the original map must have common points, and there must be another direction or distance verification; d) Azimuth line intersection method. At least three azimuth lines intersect, the data and the original map must have common points, and the intersection angle must be less than 150° and greater than 30°
7.4 Handling of overlapping frames
The representation of the overlapping frames of adjacent maps should be basically consistent, and the millimeter frame part should also be coordinated with the other parts of the entire map. The overlapping frames of the same scale map should be drawn by one map and then handed over to the adjacent map for redrawing: the overlapping frames of similar scales should generally be drawn by the larger scale map first and then handed over to the smaller scale adjacent map as data. B.1 Control points and elevation points
8.1.1 When mapping with survey data, 1~3 control points should be selected within the range of 100 mm×100 Ⅱm, and the points should be calculated and developed as the basis for checking the accuracy of the data and transferring the data. 8.1.2 Indicate the control points and elevation points on the hills (or islands) that have navigational orientation significance. Control points are divided into different levels and are all indicated by elevation point symbols. If the control point is an independent feature, it is indicated by the corresponding feature symbol. 8.1.3 For elevations less than 10m, the annotations are accurate to 0.1m; for elevations greater than 10m, the annotations are in whole meters, and the decimals are discarded. For elevations below 3m, the annotations are in GB/T17833-1999
to 0.1m; for elevations above 3m, the annotations are in whole meters, and the decimals are discarded. 8.1.4 When control points or elevation points located on the dry slope are not shown, the features should be retained. 8.2 Land features
8.2.1 On maps with a scale of 1:500,000 or larger, the more prominent land features along the coast should be shown briefly. 8.2.2 On maps with a scale of less than 1:500,000, land features are generally not shown. 8.2.3 Land features should be shown with symbols as much as possible. If there are no corresponding symbols, they can be shown with shape symbols plus name annotations. B.3 Coast
8 3.1 Coastline
8.3.1.1 On maps of all scales, the coastline should be shown in detail and accurately. The simplification of the coastline should follow the principle of enlarging the land part and reducing the sea part, while maintaining the accuracy of the main feature points and reflecting its natural curvature. 8.3.1.2 On maps of all scales, it should be shown with measured half lines. 8.3.1.3 Where the high coastline is not measured, the low coastline shall be indicated. If there is a high coastline, the low coastline shall not be indicated. 8.3.1.4 Where the river reaches the sea, its coastline shall be indicated by the coastline in areas with water depth annotations; other areas shall be indicated by the general river sideline. The connection between the coastline and the river coastline shall be natural.
8.3.2 Seashore properties
8.3.2.1 On maps with a scale greater than 1.5 million, the coastline longer than 5 mm on the map shall be indicated, and other coastal properties shall not be indicated. 8.3.2.2 On maps with a scale of 11.5 million or less, the coastal properties shall not be indicated. 8.4 Islands
8.4.1 Island coastline
The indication of island coastline is generally the same as that of continental coastline. When the island area is small and the diameter on the map is less than 5 mm, the seashore properties shall not be indicated. 8.4.2 Comprehensive principle
8.4.2.1 Isolated islands on maps of various scales shall not be discarded regardless of their size. If the diameter of the island in the figure is less than 0.6mm, the diameter of the closed curve should be enlarged to 0.6mm. 8.4.2.2 When clustered or very close to the shore islands cannot be drawn according to the scale, they shall be represented by black dots with a diameter of 0.4mm, and the direction and shape of the islands shall be close to the original shape. When the scale is reduced, some islands may be appropriately discarded, but they shall not be merged, and the direction, shape and distribution pattern of the islands shall not be changed. Clustered islands that are changeable near the coast of deltas or lagoons may be merged. 8.5 Landforms and River Systems
8.5.1 Landforms
8.5.1.1 On maps with a scale greater than 1.5 million, landforms are represented by contour lines and other landform symbols, and the contour interval is generally determined according to the scale.
8.5.1.2On maps with a scale of 1.5 million or less, only the elevation of important hills (island teeth) shall be indicated, and contour lines and other landform features shall not be indicated.
8.5.2Water system
On maps of various scales, larger rivers that reach the sea, as well as famous larger canals and tide pools, shall be indicated: rivers with a width of more than 0.4 mm shall be drawn with double lines. For some rivers, only the estuary part may be drawn at the mouth of the sea. 8.6Residential areas
8.6.1Selection of residential areas
8.6.1.1On maps with a scale of 1*500,000, select residential areas at prefecture-level cities and above, residential areas where major fishing ports and fishery administration agencies are located, and important counties and port towns.
8.6.1.2 On maps with a scale of 1:1 million or less, select the settlements of provincial capitals, major fishing ports and locations of fishery administration agencies, as well as important cities, counties, port towns, and
8.6.1.3 Settlements in foreign regions shall be represented in accordance with the above provisions. When the administrative level cannot be ascertained, it shall generally be represented according to the original data of the same or similar scale, and coordination shall be made within the same map.
8.6.2 Method of representing settlements
GB/T 17833—1999
8-6.2.1 On maps with a scale of 1:500,000, settlements at prefecture-level cities and above shall be represented in proportion, and others shall be represented by graphic symbols. 8.6.2.2 On maps with a scale of 11 million or less, settlements shall be represented by graphic symbols. 8.6.2.3 The settlements in foreign regions shall be expressed in accordance with the above provisions. When the administrative level cannot be ascertained, the original data of the same or similar scale shall be generally used for expression, and the same map shall be coordinated. 8.6.3 Generalization of settlement shapes
8.6.3.1 For settlements in cities and towns expressed in proportion, the blocks and streets may be generally generalized on the premise of maintaining the main features of the outer contour, but the direction of the main streets shall be correct. 8.6.3.2 For scattered settlements in the periphery of cities and towns, when the distribution is relatively concentrated, block symbols shall be drawn; when they are relatively dispersed, they shall be represented by independent houses or abandoned, but they shall not be merged. 8.6.4 When redrawing settlements in cities and towns expressed in proportion into graphic symbols, the position shall, in principle, be the center of the settlement rotation, and attention shall be paid to the reasonableness of the relative position with roads, rivers and other elements. 8.7 Port facilities
On the 1.5 million and 1:1 million scale maps, select the large docks and breakwaters that are shown. 8.8 Roads
8.B.1 On maps of all scales, only completed railways are shown, without distinguishing between single-track and double-track. Generally, only railways connecting residential areas are shown. 8.8.2 On maps of all scales, only completed highways are shown, distinguishing between expressways and ordinary highways. Generally, only highways connecting residential areas are shown.
8.9 Bridges
8.9.1 On maps of all scales, only bridges with railways or highways passing through are shown. 8.9.2 Bridges over single-track rivers or double-track rivers with a diameter of 2 mm or more are not shown, and the road crossing symbol crosses the river symbol. 8.10 City Walls
The Great Wall should be shown on the map, and other city walls are generally not shown. 8.11 Boundaries
8.11.1 On maps of 1:2 million and smaller scales, the Chinese border is shown. Foreign borders are not shown. 8.11.2 The base points and the frontier line of China's territorial sea shall be shown on the 1:500,000 and 1:1,000,000 scale maps. 8.11.3 All maps showing the national boundary, base points and frontier line of the territorial sea shall be submitted for approval in accordance with relevant regulations. 8.12 Thousands of shoals
8.12.1 Dry reefs shall be accurately shown on maps of all scales. Dry reefs attached to the coastline can be discarded if they are less than 5 mm in length and narrower than 2 mm in width. However, rocky and coral reefs located near shipping routes such as postal corners and waterway mouths should not be discarded, but may be shown in large size if necessary.
8.12.2 Isolated dry reefs shall not be discarded. When their diameter is less than 2 mm, rocky and coral reefs shall be shown with dry reef symbols that are not shown in proportion, and other reefs may be shown in large size with a diameter of 2 mm. 8.12.3 Rocky beaches and coral beaches shall be indicated by corresponding symbols; other types of reefs shall be indicated by overprinting within the range of thin solid lines, without noting the specific nature. The height of the reef shall not be indicated. 8.12.4 Hard reefs (rock reefs, coral reefs) on soft beaches (mud beaches, sand beaches, etc.) shall be indicated. Soft beaches on hard beaches shall not be indicated. Double reefs shall be indicated according to the nature of the seaward side.
8.12.5 Small islands on reefs shall be clearly indicated. When the scale is reduced, those near the shore may be omitted. Reefs on soft beaches shall be indicated, but the height of the reefs shall not be noted; reefs on hard beaches shall not be indicated. 8.13 Water depth
8.13.1 Density of water depth annotation (expressed by the spacing between adjacent water depth annotations on the map): 1015m for sea areas shallower than 20m
12~20mm for sea areas between 20 and 40m;
18~～30m for sea areas deeper than 40m.
GB/T17833—·1999
The depth of the coastal tendon can be appropriately increased, and the depth of the flat sea area can be appropriately reduced. 8.13.2 The provisions for rounding up water depths: For water depths shallower than 31m, one decimal place is retained, and the second decimal place is discarded. If the original data only retains one decimal place, the decimal place is expressed according to the original data and no longer rounded; for water depths deeper than 31m, the decimal place is rounded to the whole meter, and the decimal place is discarded. 8.13.3 The selection of depth notes generally follows the principle of "abandoning the deep and choosing the shallow" to ensure navigation safety. At the same time, sufficient deep-water notes should be retained to show the navigability of the channel and the characteristics of the seabed topography, which is convenient for fishing operations. 8.13.4 The displaced depths, unmeasured depths are represented by corresponding symbols, and unprecisely measured depths are represented by straight body. Except for areas with insufficient measurement data, unmeasured bottom water soundings and unprecisely measured depths are generally not selected. 8.13.5 Except for unprecisely measured depths, depth notes are represented by oblique body numbers. 8.13.6 When using new sounding data, it is necessary to check the shallow water depths that hinder navigation on the published charts (hereinafter referred to as the old version of the charts) one by one, and conduct a thorough analysis based on the identification of the water depth measurement results and the obstacle detection list to determine whether it is necessary to add or supplement according to the old version of the chart. The added shallow water depth is indicated by straight font.
8.13.7 Inconclusive notes such as "reported", "approximate position", "suspected position", "suspected existence" can generally be retained; but when the scale is reduced and the clarity of the map is affected, it can be discarded if necessary, but the "suspected existence" note should be included together with its symbol. On maps with a scale less than 1:500,000, "approximate position" and "suspected position" are discarded and not noted.
8.13.8 Shallow water depths provided by the fishery department can be supplemented if there is an accurate position, and the added shallow water depth is indicated in italics (cyan). 8.14 Isobaths
8.14.1 Isobaths are annotated with thin solid lines and a 3mm cyan 30% band is printed on the side of the shallow water area; at least one isobath note is required for steep depths in a small area.
8.14 .2 The basic isobaths indicated on maps of various scales are specified in Table 1. Table 1
Scale
1.5 million level
1+1 million level
112 million level
Basic isobaths
1D.20.40.60,100,200
20,40.60,100,203
20,40.60.100.200
8.14.3 When the basic isobaths on a map are very close and the distance between them is less than 1mm, the shallowest isobath should be kept intact, and the deeper isobath should be interrupted near the shallower isobath. When the distance between the entire isobath is less than 2mm, one or two less basic isobaths may be drawn, but they should be unified within a map.
8.14.4 The principle of "expanding shallow and shrinking deep" should be followed when drawing or summarizing isobaths. Two isobaths of the same depth representing shallow areas can be merged when they are very close, but care should be taken not to block the channel. 8.14.5 When the water depth meets the selected interval, the inaccurate isobaths on the original data can be replaced by accurate isobaths. Otherwise, except for the case where the depth is shorter than 20 mm on the map, it can be replaced by accurate representation, and generally it is still represented according to the original data. 8.14.6 If there are no isobaths on the original data or the represented isobaths do not meet the provisions of Article 8.14.2, when the water depth interval does not exceed twice (inclusive) the selected interval, the isobaths should be drawn. When the water depth interval is less than the selected interval, the drawn isobaths are represented by accurate isobaths; when it is greater than the selected interval, the drawn isobaths are represented by inaccurate isobaths. B.15 Bottom quality
8.15.1 The bottom quality of the seabed should be represented on maps of various scales. Adjectives related to color are omitted. 8.15.2 The spacing of bottom annotations is generally 40~80mm. It can be appropriately increased near anchorages, channels, sea areas with dramatic changes in seabed topography and fishing grounds.
8.15.3 The selection of bottom texture generally follows the principle of "selecting hard and discarding soft, and selecting different and discarding the same", but "silt" is generally not discarded. The description of bottom texture is generally not indicated.
8.16 Navigation Obstacles
GB/T 17833—1999
Reefs, shipwrecks and other navigation obstacles should be accurately and detailedly indicated on maps of various scales, and their nature, height and depth, etc. should be noted where the scale allows.
816.1 Reefs
8.16.1.1 Reefs are divided into clear reefs, dry reefs, filter reefs and submerged reefs. It is clearly stated that, like the island, suitable reefs refer only to reefs with a depth reference plane suitable for the bay. All other reefs with suitable tidal surfaces (such as suitable for half-tide filtration and suitable for the bay at high tide) are indicated by dry reefs. B 16.1.2 Reefs are selected in the order of open reefs, dry reefs, suitable cover reefs, and dark reefs, but the reefs located outside the reefs, on both sides of the channel or in the fishing area should be selected first.
8.16.2 Shipwrecks
8.16.2.1 Shipwrecks are divided into partially exposed shipwrecks, shipwrecks with exposed eaves, dangerous shipwrecks, non-dangerous shipwrecks, shipwrecks that have been swept, shipwrecks with measured depths, shipwrecks with unknown depths, and shipwrecks with unknown depths. 816.2.2 The general principle for selecting a group of shipwrecks is: take the outside and leave the middle, take the high and leave the low, take the shallow and leave the deep, take the big and leave the small, take iron and leave wood, take the new and leave the old, and take the complete wreck.
8.16.2.3 When the scale is reduced, if it is difficult to indicate a sunken ship with a known depth, a sunken skeleton symbol without depth indication may be used instead. 8.16.3 Dangerous material areas
8.16.3.1 Dangerous material areas (including water hazard areas, explosive dumping areas, etc.) should be indicated on maps of all scales. If they are located along the coast or are difficult to indicate after the scale is reduced, they may be omitted. 8.16.3.2 The suspected minefields that have not been cleared or have not been concluded after minesweeping should be indicated. 8.16.3.3 In order to keep the map clear, the mine danger zone that occupies part of the sea area on the map may not be drawn with its boundary line, and a concise and concise text annotation may be used to indicate its distribution range.
8.16.4 Other obstacles
8.16.4.1 Obstacles such as fishing equipment, underwater piles (pillars), seaweed, fish magnets, and submarine volcanoes are generally indicated by symbols, and sometimes can also be explained by text annotations, such as "many fishing traps nearby".
8.16.4.2 Obstacles such as magnets, shoals, and sunken ships provided by the fishery department can be supplemented if their accurate locations are available (their symbols and notes are indicated in cyan).
8.16.5 Danger lines of obstacles
The danger lines of obstacles are generally indicated according to the original data. When the scale is reduced, some obstacles are very close to the shore or do not show danger, and the original danger lines can be discarded.
8.16.6 Notes on obstacles
Notes on the year, name, reported, approximate location, suspected location, suspected existence, and nature of the relevant obstacles. For obstacles located in the open sea or in the area, the full information should be noted. After the scale is reduced, the order of year, name, suspected location, approximate location, reported, and nature can be omitted. On maps with a scale of less than 1:500,000, the year, name, suspected location, approximate location, and existence are omitted. 8.17 Currents, tides
8.17.1 Various currents, regional currents and currents shall be shown in detail on the various scales. When the scale is reduced, appropriate selection may be made. The basic principle is "dare to be strong and discard the weak". For reciprocating currents, the rising and falling tides shall be selected in pairs, and the unpaired ones shall be discarded. The months shall be noted for seasonal currents. If the basic data is not detailed enough, it shall be supplemented as much as possible based on the marine hydrological data. 8.17.2 The velocity shall be in knots, and the notes shall be accurate to one decimal place, and the second decimal place shall be rounded off. 8.17.3 The revolving tide shall be shown in detail. When there are many surrounding elements, they can be arranged in the form of a tide table at an appropriate position in the chart, and the numbers shall be indicated in the corresponding positions in the chart. The main port of the revolving tide shall be the nearest port with tidal data. When the main port of the revolving tide is not listed in the tide signal table of this chart, the high-measurement clearance of the main port shall be indicated below the tide signal table or in the title bar of the tide table. 8.17.4 Tide information tables shall be configured on maps with a scale greater than 1.5 million. The longitude and latitude of the location in the tide information table shall be noted to the whole minute, and the decimal places in the unit of minute shall be rounded up. Tide height and average sea level shall be in meters, with one decimal place retained and the second decimal place discarded. 8.18 Offshore facilities
GB/T17833—1999
8.18.1 On maps with a scale of 1*2 million and above, offshore facilities such as permanent platforms, gantry, mooring towers, wellhead pipelines, etc. shall be indicated. If such objects are missing from the bathymetric data, they can be supplemented based on the data of relevant departments such as offshore oil production and management. On maps with a scale less than 12 million, offshore facilities are generally not indicated. 8.1B.2 The map should accurately show the location and properties of various submarine pipelines (submarine power systems and submarine pipelines. When the scale is reduced, submarine pipelines in coastal non-navigation areas and non-fishing operation areas can be omitted. 8.19 Aids to navigation
8.19.1 The aids to navigation shown on the map include light beacons (lighthouses, light posts, light ships, light buoys), vertical beacons, buoys, radio beacons, reach marks, fog signals, etc.
The basic requirements for indicating aids to navigation are:
a) Reasonable selection, use of navigation marks that can be used for domestic navigation should generally be indicated to ensure the key to ship positioning; b) Accurate position to ensure the accuracy of ship positioning; c) Reasonable explanations and notes to facilitate map users to correctly identify navigation marks. 8.19.2 Various aids to navigation shall be accurately indicated on maps with a scale of 11.5 million or more, including radar stations and radio navigation signs, lighthouses and lights with a long range, major lightships, navigation marks with radar reflection or transponders, No. 1 lights for approaching ports, and buoys indicating obstacles to navigation. On maps with a scale of 1:50 or less, the top mark of the light post can be omitted, and underwater lights and articulated light posts shall be indicated as ordinary light post numbers. Fog signals and other aids to navigation shall generally not be indicated. 8.19.3 Radar stations and radio navigation signs, major lighthouses, light posts, and lightships located outside the port, navigation marks with heavy reflection and radar response located in the open sea shall be indicated on maps with a scale of less than 1.5 million; other navigation marks shall generally not be indicated. 8.19.4 Lighthouses and lights shall be distinguished on maps of various scales. When it is impossible to distinguish in foreign areas, those with a range of 15 nmi (inclusive) or more shall be indicated by lighthouse symbols, and those with a range of less than 15 nmi shall be indicated by light post symbols. 8.19.5 All guide lights, guide marks, etc. should be shown as a complete set in one drawing. Otherwise, only the guide lights and guide marks will be drawn without the guide mark lines. 8.19.6 The annotations of light marks mainly include rhythm, light color, cycle, light height, range, flat filter, season, fishing and other instructions. After the scale is reduced, the marking of light marks shall be in accordance with the following provisions:
a) For main light marks and light marks outside the port or offshore, the order of omission of the marking is: light height, period, range, other notes; b) For light marks in harbors, waterways and straits, the order of omission of the marking is: range, light height, period, other notes; c) For maps with a scale less than 12 million, all light quality notes are generally omitted and only the light symbol is marked; d) The light period in the marking of light marks is in seconds. For periods less than 3 s, round up to 0.5 8 (decimals 0.1, 0.2, 0.8, 0.9 s are rounded to the nearest whole second, and decimals 0.3~~0.7 are rounded to 0.5); for periods greater than 33, round up to whole seconds, with decimals rounded to 4 and 5. Light height is in meters, within 10 m, rounded to 0.1 m, and over 10 m Only whole meters shall be noted, and decimals shall be discarded; range shall be noted in nautical miles, within 10 n miles, to 0.1 n miles, and when it exceeds 10 n miles, only nautical miles shall be noted, and small effects shall be discarded. When the light color is monochromatic white light, it shall not be monochromatic. 8.19.7 The name and number of the navigation aid shall generally be indicated, and as the scale is reduced, it may be appropriately selected according to the situation. If the name of the navigation aid is the same as the name of the geographical entity where it is located, the name of the navigation aid shall not be noted when the name of the geographical entity has been noted. 8.19.8 In addition to indicating aids to navigation based on basic data, the navigation aids list, navigation notices and navigation aid survey data should also be checked. In case of discrepancies, the following provisions shall generally be followed:
) If the position of the navigation aid in the navigation aid list is inconsistent with that in the newly surveyed data, the newly surveyed data shall prevail. If there is a notice to correct the new data, the notice shall prevail;
b) The light quality of the light beacon in China's sea areas is generally based on the navigation aid list. However, if a special survey has been conducted on the light beacon, the survey data shall prevail. For lights without light quality in the newly surveyed data, the light quality shall be added according to the navigation aid list. If the light beacon is not recorded in the navigation aid list and survey data, only the navigation aid symbol and light symbol shall be drawn without the light quality. The navigation marks of ports, ports, stations and foreign areas shall be based on the adopted nautical chart data. If there is a notice of correction, it shall be based on the notice: c) When the light quotient in the new survey data and survey data differs from the navigation mark table by 0.5m (inclusive), the light height shall still be based on the navigation mark table. When it exceeds 0.5m, it shall be corrected by the new survey data and survey data. 8.20 Signal stations and marine service facilities such as pilotage and rescue should be shown on maps with a scale of 11.5 million or more. They can be selected as the scale is reduced.2 The velocity is in knots, and the notes are accurate to one decimal place, and the second decimal place is rounded up. 8.17.3 The revolving tide should be shown in detail. When there are many surrounding elements, it can be arranged in the form of a tide table at an appropriate position in the map, and the number is indicated in the corresponding position in the map. The main port of the revolving tide should be the nearest port with tidal data. When the main port of the revolving tide is not listed in the tide signal table of this map, the high-measurement gap of the main port should be stated below the tide signal table or in the title bar of the tide table. 8.17.4 Tide signal tables are configured on maps with a scale greater than 1! 500,000. The longitude and latitude of the location in the tide signal table are noted to the whole minute, and the decimal places in the unit of minute are rounded up. The tidal height and mean sea level are in meters, retaining one decimal place and discarding the second decimal place. 8.18 Offshore facilities
GB/T17833—1999
8.18.1 On maps with a scale of 1*2 million or larger, offshore facilities such as permanent platforms, gantry, mooring towers, wellhead pipelines, etc. are indicated. If such objects are missing from the bathymetric data, they can be supplemented based on the data of relevant departments such as offshore oil production and management. On maps with a scale of less than 12 million, offshore facilities are generally not indicated. 8.1B.2 The map should accurately show the location and properties of various submarine pipelines (submarine power systems and submarine pipelines. When the scale is reduced, submarine pipelines in coastal non-navigation areas and non-fishing operation areas can be omitted. 8.19 Aids to navigation
8.19.1 The aids to navigation shown on the map include light beacons (lighthouses, light posts, light ships, light buoys), vertical beacons, buoys, radio beacons, reach marks, fog signals, etc.
The basic requirements for indicating aids to navigation are:
a) Reasonable selection, use of navigation marks that can be used for domestic navigation should generally be indicated to ensure the key to ship positioning; b) Accurate position to ensure the accuracy of ship positioning; c) Reasonable explanations and notes to facilitate map users to correctly identify navigation marks. 8.19.2 Various aids to navigation shall be accurately indicated on maps with a scale of 11.5 million or more, including radar stations and radio navigation signs, lighthouses and lights with a long range, major lightships, navigation marks with radar reflection or transponders, No. 1 lights for approaching ports, and buoys indicating obstacles to navigation. On maps with a scale of 1:50 or less, the top mark of the light post can be omitted, and underwater lights and articulated light posts shall be indicated as ordinary light post numbers. Fog signals and other aids to navigation shall generally not be indicated. 8.19.3 Radar stations and radio navigation signs, major lighthouses, light posts, and lightships located outside the port, navigation marks with heavy reflection and radar response located in the open sea shall be indicated on maps with a scale of less than 1.5 million; other navigation marks shall generally not be indicated. 8.19.4 Lighthouses and lights shall be distinguished on maps of various scales. When it is impossible to distinguish in foreign areas, those with a range of 15 nmi (inclusive) or more shall be indicated by lighthouse symbols, and those with a range of less than 15 nmi shall be indicated by light post symbols. 8.19.5 All guide lights, guide marks, etc. should be shown as a complete set in one drawing. Otherwise, only the guide lights and guide marks will be drawn without the guide marks lines. 8.19.6 The annotations of light marks mainly include rhythm, light color, cycle, light height, range, flat filter, season, fishing and other instructions. After the scale is reduced, the marking of light marks shall be in accordance with the following provisions:
a) For main light marks and light marks outside the port or offshore, the order of omission of the marking is: light height, period, range, other notes; b) For light marks in harbors, waterways and straits, the order of omission of the marking is: range, light height, period, other notes; c) For maps with a scale less than 12 million, all light quality notes are generally omitted and only the light symbol is marked; d) The light period in the marking of light marks is in seconds. For periods less than 3 s, round up to 0.5 8 (decimals 0.1, 0.2, 0.8, 0.9 s are rounded to the nearest whole second, and decimals 0.3~~0.7 are rounded to 0.5); for periods greater than 33, round up to whole seconds, with decimals rounded to 4 and 5. Light height is in meters, within 10 m, rounded to 0.1 m, and over 10 m Only whole meters shall be noted, and decimals shall be discarded; range shall be noted in nautical miles, within 10 n miles, to 0.1 n miles, and when it exceeds 10 n miles, only nautical miles shall be noted, and small effects shall be discarded. When the light color is monochromatic white light, it shall not be monochromatic. 8.19.7 The name and number of the navigation aid shall generally be indicated, and as the scale is reduced, it may be appropriately selected according to the situation. If the name of the navigation aid is the same as the name of the geographical entity where it is located, the name of the navigation aid shall not be noted when the name of the geographical entity has been noted. 8.19.8 In addition to indicating aids to navigation based on basic data, the navigation aids list, navigation notices and navigation aid survey data should also be checked. In case of discrepancies, the following provisions shall generally be followed:
) If the position of the navigation aid in the navigation aid list is inconsistent with that in the newly surveyed data, the newly surveyed data shall prevail. If there is a notice to correct the new data, the notice shall prevail;
b) The light quality of the light beacon in China's sea areas is generally based on the navigation aid list. However, if a special survey has been conducted on the light beacon, the survey data shall prevail. For lights without light quality in the newly surveyed data, the light quality shall be added according to the navigation aid list. If the light beacon is not recorded in the navigation aid list and survey data, only the navigation aid symbol and light symbol shall be drawn without the light quality. The navigation marks of ports, ports, stations and foreign areas shall be based on the adopted nautical chart data. If there is a notice of correction, it shall be based on the notice: c) When the light quotient in the new survey data and survey data differs from the navigation mark table by 0.5m (inclusive), the light height shall still be based on the navigation mark table. When it exceeds 0.5m, it shall be corrected by the new survey data and survey data. 8.20 Signal stations and marine service facilities such as pilotage and rescue should be shown on 11.5 million scale and larger maps, and they can be selected as the scale is reduced.2 The velocity is in knots, and the notes are accurate to one decimal place, and the second decimal place is rounded up. 8.17.3 The revolving tide should be shown in detail. When there are many surrounding elements, it can be arranged in the form of a tide table at an appropriate position in the map, and the number is indicated in the corresponding position in the map. The main port of the revolving tide should be the nearest port with tidal data. When the main port of the revolving tide is not listed in the tide signal table of this map, the high-measurement gap of the main port should be stated below the tide signal table or in the title bar of the tide table. 8.17.4 Tide signal tables are configured on maps with a scale greater than 1! 500,000. The longitude and latitude of the location in the tide signal table are noted to the whole minute, and the decimal places in the unit of minute are rounded up. The tidal height and mean sea level are in meters, retaining one decimal place and discarding the second decimal place. 8.18 Offshore facilities
GB/T17833—1999
8.18.1 On maps with a scale of 1*2 million or larger, offshore facilities such as permanent platforms, gantry, mooring towers, wellhead pipelines, etc. are indicated. If such objects are missing from the bathymetric data, they can be supplemented based on the data of relevant departments such as offshore oil production and management. On maps with a scale of less than 12 million, offshore facilities are generally not indicated. 8.1B.2 The map should accurately show the location and properties of various submarine pipelines (submarine power systems and submarine pipelines. When the scale is reduced, submarine pipelines in coastal non-navigation areas and non-fishing operation areas can be omitted. 8.19 Aids to navigation
8.19.1 The aids to navigation shown on the map include light beacons (lighthouses, light posts, light ships, light buoys), vertical beacons, buoys, radio beacons, reach marks, fog signals, etc.
The basic requirements for indicating aids to navigation are:
a) Reasonable selection, use of navigation marks that can be used for domestic navigation should generally be indicated to ensure the key to ship positioning; b) Accurate position to ensure the accuracy of ship positioning; c) Reasonable explanations and notes to facilitate map users to correctly identify navigation marks. 8.19.2 Various aids to navigation shall be accurately indicated on maps with a scale of 11.5 million or more, including radar stations and radio navigation signs, lighthouses and lights with a long range, major lightships, navigation marks with radar reflection or transponders, No. 1 lights for approaching ports, and buoys indicating obstacles to navigation. On maps with a scale of 1:50 or less, the top mark of the light post can be omitted, and underwater lights and articulated light posts shall be indicated as ordinary light post numbers. Fog signals and other aids to navigation shall generally not be indicated. 8.19.3 Radar stations and radio navigation signs, major lighthouses, light posts, and lightships located outside the port, navigation marks with heavy reflection and radar response located in the open sea shall be indicated on maps with a scale of less than 1.5 million; other navigation marks shall generally not be indicated. 8.19.4 Lighthouses and lights shall be distinguished on maps of various scales. When it is impossible to distinguish in foreign areas, those with a range of 15 nmi (inclusive) or more shall be indicated by lighthouse symbols, and those with a range of less than 15 nmi shall be indicated by light post symbols. 8.19.5 All guide lights, guide marks, etc. should be shown as a complete set in one drawing. Otherwise, only the guide lights and guide marks will be drawn without the guide mark lines. 8.19.6 The annotations of light marks mainly include rhythm, light color, cycle, light height, range, flat filter, season, fishing and other instructions. After the scale is reduced, the marking of light marks shall be in accordance with the following provisions:
a) For main light marks and light marks outside the port or offshore, the order of omission of the marking is: light height, period, range, other notes; b) For light marks in harbors, waterways and straits, the order of omission of the marking is: range, light height, period, other notes; c) For maps with a scale less than 12 million, all light quality notes are generally omitted and only the light symbol is marked; d) The light period in the marking of light marks is in seconds. For periods less than 3 s, round up to 0.5 8 (decimals 0.1, 0.2, 0.8, 0.9 s are rounded to the nearest whole second, and decimals 0.3~~0.7 are rounded to 0.5); for periods greater than 33, round up to whole seconds, with decimals rounded to 4 and 5. Light height is in meters, within 10 m, rounded to 0.1 m, and over 10 m Only whole meters shall be noted, and decimals shall be discarded; range shall be noted in nautical miles, within 10 n miles, to 0.1 n miles, and when it exceeds 10 n miles, only nautical miles shall be noted, and small effects shall be discarded. When the light color is monochromatic white light, it shall not be monochromatic. 8.19.7 The name and number of the navigation aid shall generally be indicated, and as the scale is reduced, it may be appropriately selected according to the situation. If the name of the navigation aid is the same as the name of the geographical entity where it is located, the name of the navigation aid shall not be noted when the name of the geographical entity has been noted. 8.19.8 In addition to indicating aids to navigation based on basic data, the navigation aids list, navigation notices and navigation aid survey data should also be checked. In case of discrepancies, the following provisions shall generally be followed:
) If the position of the navigation aid in the navigation aid list is inconsistent with that in the newly surveyed data, the newly surveyed data shall prevail. If there is a notice to correct the new data, the notice shall prevail;
b) The light quality of the light beacon in China's sea areas is generally based on the navigation aid list. However, if a special survey has been conducted on the light beacon, the survey data shall prevail. For lights without light quality in the newly surveyed data, the light quality shall be added according to the navigation aid list. If the light beacon is not recorded in the navigation aid list and survey data, only the navigation aid symbol
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