Attachment_E_-_Nautical_Chart_Policy.pdf

U.S. Chart No. 1 Symbols, Abbreviations and Terms used on Paper and Electronic Navigational Charts

12th Edition, April 15, 2013 Corrected through NM Nov. 16, 2013

Corrected through LNM Nov. 12, 2013

Prepared Jointly by

Department of Commerce National Oceanic and Atmospheric Administration

Department of Defense National Geospatial-Intelligence Agency

New in Edition 12: ECDIS Symbols and Other ECDIS Information

ECDIS

Symbology for displaying Electronic Navigational Charts (ENCs) on an Electronic Chart Display and Information System (ECDIS) has been added to U.S. Chart No. 1. See the Preface and Introduction sections for more details.

In addition to the ECDIS symbols shown in the traditional lettered sections of U.S. Chart No. 1, there are now several special pages devoted exclusively to providing important details about ECDIS. These pages are distinguished by the ECDIS icon, as shown in the top left corner of this page. The ECDIS pages are also listed in the table of contents in italic type.

One major difference in the use of paper charts and ENCs is the ability of ECDIS to display the same feature differently depending on user settings and other conditions, such as a ship’s draft. An important example is that ECDIS displays wrecks, rocks and other obstructions with their traditional “paper chart” symbols if they are at or deeper than the depth of the safety contour set for the ship. Dangers that are shoaler are portrayed with the unique ECDIS “isolated danger” symbol shown at left. (See the ECDIS Portrayal of Depths page for more information about the ECDIS safety contour.)

Another advantage that ECDIS provides over paper charts is enabling users to obtain more information about a feature through a “cursor pick.” Some feature attribute values that can be obtained by cursor pick are noted throughout U.S. Chart No. 1. This is especially true if a particular value, such as height, vertical clearance or the like is included in the INT symbol description. The cursor pick icon, shown at left, is used to indicate when a reference to a cursor pick is made.

7KHUH�DUH�PDQ\�RWKHU�DWWULEXWH�YDOXHV�WKDW�XVHUV�PD\�REWDLQ�WKURXJK�D�FXUVRU�SLFN�WKDW�DUH�QRW�VSHFL¿FDOO\�QRWHG��7KHVH�LQFOXGH��EXW�DUH�QRW� limited to, the purpose, seasonality, periodicity, status, color, height, type of structure and the visual or radar conspicuousness of features;

shape, color or color pattern of buoys; characteristics of lights; category of obstructions and wrecks; radar wave length, radio frequency, communication channel and call signs; the presence of AIS transmitted signals; information regarding pilotage services and many more.

No man is an island and no single reference document stands on its own. U.S. Chart No. 1 is a handy guide for ECDIS users, but it is no substitute for mandated ECDIS training.

The ECDIS user and developer communities are invited to help improve the presentation of ECDIS symbology and infor mation in U.S. Chart No. 1. We want to know what you think works well, which parts are a little rocky, and what additional information you would like to have included in the next edition of U.S. Chart No. 1.

Please send any recommendations or corrections to:

USChart1@noaa.gov or National Ocean Service, NOAA (N/CS2) Attention: U.S. Chart No. 1 1315 East West Highway Silver Spring, MD 20912-3282 mailto:USChart1@noaa.gov

SYMBOLS, ABBREVIATIONS AND TERMS

Contents

Document Sections and ECDIS Pages

Preface 5 Introduction 5 Schematic Layout 8 Day, Dusk and Night Color Palettes 9 Conspicuous and Non-Conspicuous Features 26 ECDIS Portrayal of Depths 45 Examples of Routing Measures in ECDIS 66

6LPSOL¿HG�DQG�7UDGLWLRQDO�³3DSHU�&KDUW´�6\PEROV 86

Index of Abbreviations 106 Index 112 Appendix 1, IALA Maritime Buoyage System 124

Symbol Sections

GENERAL

A Chart Number, Title, Marginal Notes B Positions, Distances, Directions, Compass

TOPOGRAPHY

C Natural Features D Cultural Features E Landmarks F Ports G (Not currently used)

HYDROGRAPHY

H Tides, Currents I Depths J Nature of the Seabed K Rocks, Wrecks, Obstructions, Aquaculture L Offshore Installations M Tracks, Routes N Areas, Limits O (Not currently used)

NAVIGATION AIDS AND SERVICES

P Lights Q Buoys, Beacons R Fog Signals S Radar, Radio, Satellite Navigation Systems T Services U Small Craft (Leisure) Facilities

PREFACE

Presentation of Two Symbology Sets This edition of U.S. Chart No. 1 has a new name and a new look. Its title is now Sym- EROV��$EEUHYLDWLRQV�DQG�7HUPV�XVHG�RQ�3DSHU�DQG�(OHFWURQLF�1DYLJDWLRQDO�&KDUWV. For WKH�¿UVW�WLPH��8�6��&KDUW�1R����SUHVHQWV�ERWK�RI�WKH�PDMRU�V\PERORJ\�VHWV�XVHG�IRU� marine navigation.

As in previous editions, the symbols used on paper nautical charts produced by the National Oceanic and Atmospheric Administration (NOAA) and the National Geospatial- Intelligence Agency (NGA) and digital raster representations of those charts, such as NOAA Raster Nautical Charts (NOAA RNCs®), are presented in lettered sections organized in categories, such as Landmarks, Depths, and Lights. New in this edition is the inclusion of the corresponding symbols used to portray Electronic Navigational Chart (ENC) data on Electronic Chart Display and Information Systems (ECDIS) as

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Other Non-ECDIS Digital Displays May Portray Data Differently 1DYLJDWLRQ�V\VWHPV�FHUWL¿HG�WR�PHHW�WKH�H[DFWLQJ�SHUIRUPDQFH�VWDQGDUGV�HVWDEOLVKHG� by the International Maritime Organization (IMO) are said to be ECDIS “type approved.”

The symbology used to display ENCs or other non-ENC nautical navigational data on non-ECDIS systems, such as geographic information systems, recreational GPS and RWKHU�FKDUW�GLVSOD\�V\VWHPV�FDQ�GLIIHU�VLJQL¿FDQWO\�IURP�WKH�V\PERORJ\�VSHFL¿HG�IRU� ECDIS type approved systems. U.S. Chart No. 1 RQO\�VKRZV�WKH�V\PERORJ\�XVHG�RQ�

ECDIS.

INTRODUCTION

New Column Headers The orientation of this edition of U.S. Chart No. 1 has been rotated 90° into a land scape format to allow two additional columns to be added to the right side of the page.

These columns hold the ECDIS symbols corresponding to the paper chart symbols shown on the left side.

³,17� �´� V\PEROV�� DV� VSHFL¿HG� LQ� WKH� 5HJXODWLRQV� RI� WKH� ,+2� IRU� ,QWHUQDWLRQDO� �,17�� &KDUWV�DQG�&KDUW�6SHFL¿FDWLRQV�RI� WKH� ,+2��appear in the second column from the left, after the symbol number. Any variations from INT 1 symbology that are used on charts produced by NOAA or NGA are shown in the NOAA, NGA and the “Other NGA” columns (columns 4a, 4b, and 5 respectively).

ECDIS symbols and their descriptions are shown in columns 6 and 7 respectively.

The ECDIS description usually provides the generic symbol name given in the IHO 6SHFL¿FDWLRQV�IRU�&KDUW�&RQWHQW�DQG�'LVSOD\�$VSHFWV�RI�(&',6� although sometimes other clarifying terms are also provided in column 7. The ECDIS symbols shown use the day color palette (see page 9).

When columns 4a and 4b are combined, this indicates that NOAA and NGA both use the same non-INT 1 symbol for that particular feature. When any of columns 4a, 4b, or 5 are blank, then the INT 1 symbol has been adopted for use by the organization for which that column applies.

The schematic layout following this introduction shows a typical symbol table page.

It provides details about the table headers and the types of information presented in each of the columns.

Sample Chart Layouts Section A presents two schematics showing typical layouts of the major elements of NOAA and NGA charts.

INFORMATION ON SELECTED CHART FEATURES

Soundings The sounding datum reference is stated in the chart title. Soundings on NOAA and NGA charts may be shown in fathoms, feet, fathoms and feet, fathoms and fractions, or meters and decimeters. In all cases the unit of depth used is shown in the chart title and outside the border of the chart in bold type (see item b in Section A). For ECDIS, the sounding datum is part of the ENC metadata, which can be retrieved through a cursor inquiry.

Heights Heights of lights, landmarks, structures, etc. refer to the shoreline plane of reference.

The unit of height is shown in the chart title. When the elevations of islets or bare rocks are offset into the adjacent water, they are shown in parentheses. For ECDIS, the unit of height is meters.

Drying Heights For rocks and banks that cover and uncover, elevations are underlined and are ref erenced to the sounding datum as stated in the chart title (or in the ENC metadata).

When the heights of rocks that cover and uncover are offset into the adjacent water, they are shown in parentheses.

Shoreline Shoreline shown on charts represents the line of contact between the land and a VHOHFWHG�ZDWHU�HOHYDWLRQ��,Q�DUHDV�DIIHFWHG�E\�WLGDO�ÀXFWXDWLRQ��WKLV�OLQH�RI�FRQWDFW�LV� XVXDOO\�WKH�PHDQ�KLJK�ZDWHU�OLQH��,Q�FRQ¿QHG�FRDVWDO�ZDWHUV�RI�GLPLQLVKHG�WLGDO�LQÀX ence, a mean water level may be used. The shoreline of interior waters (rivers, lakes) LV�XVXDOO\�D�OLQH�UHSUHVHQWLQJ�D�VSHFL¿HG�HOHYDWLRQ�DERYH�D�VHOHFWHG�GDWXP��6KRUHOLQH� is symbolized by a heavy line (symbol C 1). Apparent shoreline is used on charts to show the outer edge of marine vegetation where the limit would be expected to appear as the shoreline to the mariner or where it prevents the shoreline from being clearly GH¿QHG��$SSDUHQW�VKRUHOLQH�LV�V\PEROL]HG�E\�D�OLJKW� OLQH��V\PEROV�&�����&�����&�S�� C q and C r).

Landmarks A structure or a conspicuous feature on a structure may be shown by a landmark sym bol with a descriptive label (see Section E). Prominent buildings that could assist the mariner may be shown by actual shape as viewed from above (see Sections D and E).

On NGA charts, landmark legends shown in capital letters indicate that a landmark is conspicuous; the landmark may also be labeled “CONSPICUOUS” or “CONSPIC.”

On NOAA charts, all landmarks are considered to be conspicuous, and landmark leg ends shown in all capital letters indicate a landmark has been positioned accurately;

legends using both upper and lower case letters indicate an approximate position.

ECDIS portrays conspicuous features with black symbols and non-conspicuous fea tures with brown symbols. Only the conspicuous version is shown in the lettered sec tions of U.S. Chart No. 1. See the ECDIS “Conspicuous and Non-Conspicuous Fea tures” page in front of Section E for more information.

IALA Buoyage System The International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA) Maritime Buoyage System is followed by most of the world’s maritime nations;

however, systems used in some foreign waters may be different. IALA buoyage is divided into two regions: Region A and Region B. All navigable waters of the United States follow IALA Region B rules, except U.S. possessions west of the International Date Line and south of 10° north latitude, which follow IALA Region A rules.

The major difference between the two buoyage regions is the color of the lateral marks. Region A uses red to port and Region B uses red to starboard (red-right returning). The shapes of the lateral marks are the same in both regions, can to port and cone (nun) to starboard, when entering from seaward. Cardinal and other marks, such as those for isolated dangers, safe water and special marks are also the same in both regions. Section Q and Appendix 1 illustrate the IALA buoyage system for both Regions A and B.

U.S. Lateral Marks Most of U.S. waters are in IALA Region B. In the U.S. system, on entering a channel from seaward, buoys and beacon dayboards on the starboard side are red with even numbers and have red lights, if lit. Buoys and beacon dayboards on the port side are green with odd numbers and have green lights, if lit. Preferred channel buoys have red and green horizontal bands with the top band color indicating the preferred side of passage.

Light Range (Visibility) A light’s range or visibility is given in nautical miles, except on the Great Lakes and adjacent waterways, where light ranges are given in statute miles. For lights having more than one color, NOAA charts give only the shortest range of all the colors. On NGA charts, multiple ranges may be shown using the following convention. For lights ZLWK�WZR�FRORUV��WKH�¿UVW�QXPEHU�LQGLFDWHV�WKH�UDQJH�RI�WKH�¿UVW�FRORU�DQG�WKH�VHFRQG� number indicates the range of the second color. For example, Fl WG 12/8M means the range of the white light is 12 nautical miles and the range of green light is 8 nautical miles. For lights with three colors, only the longest and shortest ranges are given and the middle range is indicated by a dash. For example, Fl WRG 12-8M means that the range of the white light is 12 nautical miles, the range of green light is 8 nautical miles and the range of the red light is between 8 to 12 nautical miles. The dash can appear in any of the three positions.

Aids to Navigation Positioning 7KH�¿[HG�DQG�ÀRDWLQJ�DLGV�WR�QDYLJDWLRQ�GHSLFWHG�RQ�FKDUWV�KDYH�YDU\LQJ�GHJUHHV�RI� reliability. Floating aids are moored to sinkers by varying lengths of chain and may shift due to sea conditions and other causes. Buoys may also be carried away, capsized or sunk. Lighted buoys may be extinguished and sound signals may not function, because of ice or other causes. Therefore, prudent mariners will not rely solely on any VLQJOH�DLG�WR�QDYLJDWLRQ��SDUWLFXODUO\�RQ�ÀRDWLQJ�DLGV��EXW�ZLOO�DOVR�XVH�EHDULQJV�IURP�

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Colors Color conveys the nature and importance of features found on nautical charts. Chart HOHPHQWV�VLJQL¿FDQW� WR�PDULQH�QDYLJDWLRQ��VXFK�DV� OLJKWV��FRPSDVV�URVHV�DQG�UHJX lated areas, are emphasized with magenta. Lateral marks on NOAA charts are shown ZLWK�D�UHG�RU�JUHHQ�¿OO��6KDGHV�RI�EOXH�GHSLFW�SRWHQWLDO�KD]DUGV�WR�QDYLJDWLRQ��W\SLFDOO\� shallow water and submerged obstructions. Areas of deeper water believed to be clear of obstructions are shown as white. Land, and other features that are always dry, are depicted with buff on NOAA charts and gray on NGA charts. Foreshore and other intertidal features are portrayed with a green tint. Other colors may be used to provide additional information, such as protected areas, which are outlined in blue or green and mineral lease blocks, which are outlined in red.

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tion, particularly in areas of high density shipping. These schemes are described in the International Maritime Organization (IMO) publication, Ships Routeing.�7UDI¿F�VHSDUD tion schemes are generally shown on nautical charts at scales of 1:600,000 and larger.

:KHQ�SRVVLEOH��WUDI¿F�VHSDUDWLRQ�VFKHPHV�DUH�SORWWHG�WR�VFDOH�DQG�VKRZQ�DV�GHSLFWHG� in Section M.

Conversion Scales Depth conversion scales are provided on all charts to enable the user to work in meters, fathoms or feet.

Correction Date The date of each new chart edition is shown below the lower left border of the chart.

The date of the latest NGA issued U.S. Notice to Mariners applied to the chart is shown after the edition date. NOAA charts also show the date of the latest U.S. Coast Guard Local Notice to Mariners applied to the chart.

ADDITIONAL RESOURCES

Information on the use of nautical charts, aids to navigation, sounding datums and the practice of navigation in general is in 7KH�$PHULFDQ�3UDFWLFDO�1DYLJDWRU�(Bowditch), available through the “Publications” link on the NGA Maritime Safety Information portal at msi.nga.mil/NGAPortal/MSI.portal.

Tide and current data over U.S. waters is available from the NOAA Center for Opera tional Oceanographic Products and Services at tidesandcurrents.noaa.gov.

'HWDLOHG�LQIRUPDWLRQ�DERXW�VSHFL¿F�OLJKWV��EXR\V��DQG�EHDFRQV�DQG�JHQHUDO�LQIRUPDWLRQ� about the U.S. Aids to Navigation System and the Uniform State Waterway Marking Sys tems is in the U.S. Coast Guard Light List, at navcen.uscg.gov/?pageName=lightLists.

Information about aids to navigation in foreign waters is in the NGA List of Lights, avail able through the “Publications” link on the NGA Maritime Safety Information portal at msi.nga.mil/NGAPortal/MSI.portal.

Other important information that cannot be shown conveniently on nautical charts can be found in the NOAA U.S. Coast Pilot®, at www.nauticalcharts.noaa.gov/staff/ chartspubs.html and NGA Sailing Directions, available through the “Publications” link on the NGA Maritime Safety Information portal at msi.nga.mil/NGAPortal/MSI.portal.

U.S. Nautical Chart Catalogs and Indexes NGA catalogs are available through the “Product Catalog” link on the NGA Maritime Safety Information portal at msi.nga.mil/NGAPortal/MSI.portal. NOAA catalogs are available at www.nauticalcharts.noaa.gov/mcd/ccatalogs.htm. A list of the dates of the latest editions of NOAA charts is at www.nauticalcharts.noaa.gov/mcd/dole.htm.

CORRECTIONS AND COMMENTS

Corrections to U.S. Chart No. 1 will appear in the weekly U.S. Notice to Mariners, available through the “Notice to Mariners” link on the NGA Maritime Safety Information portal at msi.nga.mil/NGAPortal/MSI.portal.

Users may send corrections or comments to USChart1@noaa.gov or by mail to:

National Ocean Service, NOAA (N/CS2) Attention: U.S. Chart No. 1 1315 East West Highway Silver Spring, MD 20910-3282 mailto:USChart1@noaa.gov www.nauticalcharts.noaa.gov/mcd/dole.htm www.nauticalcharts.noaa.gov/mcd/ccatalogs.htm www.nauticalcharts.noaa.gov/staff http:tidesandcurrents.noaa.gov

Schematic Layout of U.S. Chart No. 1:

A K Rocks, Wrecks, Obstructions B

A

B

C

D

E

Rocks Supplementary national symbol: a 3ODQH�RI�5HIHUHQFH�IRU�+HLJKWV�ĺ�+��������������������3ODQH�RI�5HIHUHQFH�IRU�'HSWKV�ĺ�+

No. INT 'HVFULSWLRQ NOAA NGA Other NGA (&',6

11 Rock which covers and uncov ers, height above chart datum

( )2 4( )2 Uncov 1m ( )06

Uncov 1m ( )06 rock which covers and uncovers or is awash at low water underwater hazard which covers and uncovers with drying height isolated danger of depth less than the safety contour

C

E

21 3 4a 4b 5 6 7

4a *

4b *

Section designation

Section

Sub-section

Reference to “Supplementary national symbols” at the end of each section

Cross-reference to terms in other sections

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Column 3: Description of symbol, term, or abbreviation

Column 4a: Representation used on charts produced by the National Oceanic and Atmospheric Administration (NOAA)

Column 4b: Representation used on charts produced by the National Geospatial-Intelligence Agency (NGA)

Column 5: Representation of symbols that may appear on NGA reproductions of foreign charts

Column 6: Representation used to portray ENC data on ECDIS

Column 7: Description of ECDIS symbols

When columns 4a and 4b are combined then NOAA and NGA both use the same symbol. When either column 4a or 4b is blank then the respective agency uses the INT 1 symbol shown in column 2.

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6LJQL¿HV�WKDW�D�IHDWXUH�DWWULEXWH�YDOXH��VXFK�DV�D�KHLJKW��GLVWDQFH�RU�QDPH��PD\�EH�REWDLQHG�WKURXJK�DQ�(&',6�FXUVRU�SLFN�UHSRUW��7KHUH�DUH�PDQ\�DWWULEXWH�YDOXHV�WKDW�PD\�EH�REWDLQHG�LQ�WKLV�PDQQHU��EXW�WKH�FXUVRU� SLFN�LFRQ�LV�RQO\�XVHG�WR�QRWH�YDOXHV�WKDW�DUH�VSHFL¿FDOO\�UHIHUUHG�WR�LQ�WKH�GHVFULSWLRQ�RI�V\PEROV�FROXPQ�DQG�WKDW�(&',6�GRHV�QRW�GLVSOD\�QH[W�WR�WKH�V\PERO��+HLJKW�RI�WUHHV�LQ�&����LV�DQ�H[DPSOH�

Day, Dusk and Night Color Palettes

ECDIS allows the mariner to change the color palette that is used to display an ENC.

Three different color tables have been designed to provide the maximum clarity and contrast between features on the display under three different lighting conditions on the bridge, namely Day, Dusk and Night.

Each symbol is rendered in a different color appropriate for the lighting condition that the color table is meant for. This design provides maximum contrast for the display on a sunny day, as well as preserving night vision on a dimly lit bridge in the evening. This allows the mariner to look back and forth between the chart on the ECDIS display and out to sea through the bridge window without the mariner’s eyes needing to readjust to a difference in light intensity.

DAY

� ����7KH�'D\�&RORU�7DEOH��PHDQW�WR�EH�XVHG�LQ�EULJKW�VXQOLJKW��XVHV�D�ZKLWH�EDFN ground for deep water and looks the most like a traditional paper chart.

� ����7KH� 'XVN� &RORU� 7DEOH� XVHV� D� EODFN� EDFNJURXQG� IRU� GHHS� ZDWHU� DQG� colors are subdued, but slightly brighter than those used in the Night Color Table.

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black background for deep water and muted color shades for other features.

The images on the right show each of the three color palettes.

DUSK

The symbols shown in the remainder of this document use the day color palette.

NIGHT

A

C ha rt

N um be r, Ti tle

, M ar gi na l N ot es

Mercator Projection

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North American Datum of 1983

(World Geodetic System 1984)

Note: this is an example only and not to be used for navigation

Published at Washington, D.C.

U.S. DEPARTMENT OF COMMERCE

NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

NATIONAL OCEAN SERVICE

COAST SURVEY

Unimak Pass 1:15000

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Schematic Layout of a NOAA Chart (reduced in size)

0500 1000 1500500

Yards 1.000.1

Nautical Miles

500 1000 1500500 0

Meters

0DJQHWLF�)HDWXUHV�ĺ�%

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1 Chart number in national chart series

2 Chart number in international (INT) series (if any)

3 Reference ellipsoid of the chart

4 Publication note (imprint)

5 Copyright note

6 Date of current edition

7 Notice to Mariners corrections

8 Dimensions of inner borders

9 Corner coordinates

10 Chart title

11 Explanatory notes on chart construction, etc. To be read before using chart.

12 Seal(s)

13 Scale of chart. Some charts have scale at a stated latitude.

14 Linear scale on large scale charts

Linear border scale on large scale charts. On smaller scales use latitude borders for sea miles.

Cautionary notes (if any). Information on particular features, to be read before using chart.

Source Diagram (if any). Navigators should be cautious where surveys are inadequate.

18 Reference to a larger scale chart

19 Reference to an adjoining chart of similar scale a Conversion scales b Reference to the units used for depth measurement c Compass rose d Bar code and stock number e Glossary: Translation of words on chart that are not in English f ,GHQWL¿FDWLRQ�RI�D�ODWWLFHG�FKDUW��LI�DQ\� g Tidal and Tidal Stream information within the chart coverage

C hart N um ber, Title, M arginal N otes

A

B Positions, Distances, Directions, Compass

NOAANo. INT

Geographical Positions

Description

Latitude

Longitude

International Meridian (Greenwich)

Degree(s)

Minute(s) of arc

Second(s) of arc

Position approximate (not accurately determined or does

QRW�UHPDLQ�¿[HG�

Position doubtful (reported in various positions)

North

East

South

West

Northeast

Southeast

Northwest

Southwest

NGA Other NGA ECDIS

Position approximate

Point feature or area of low accuracyPA (PA)

Sounding of low accuracy

Point feature or area of low accuracy

PD (PD)

Sounding of low accuracy

Lat

Long ƍ

Ǝ

3$

PD

N

E

S

W

NE

SE

NW

SW

Positions, Distances, Directions, Compass B

No. INT Description NOAA NGA Other NGA ECDIS

Control Points

20 Triangulation point

Position of an elevation or control point

21 † Observation spot Obs Spot

22 Fixed point

23 † Benchmark BM

24 Boundary mark Bdy Mon

25.1 Distance along waterway, no

visible marker St

M

Canal and distance point with no mark

25.2 Distance along waterway with

visible marker

Y Bn (46) 7 Canal and distance point

Note: ECDIS uses a magenta “km” symbol to represent distance marks. However, the distances shown along waterways on NOAA-produced ENCs are displayed in statute miles.

Symbolized Positions (Examples)

30 Symbols in plan: position is center of primary symbol ECDIS follows the paper chart convention for the

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buoys and beacons (see Q 1).31 6\PEROV�LQ�SUR¿OH��SRVLWLRQ�LV�DW� bottom of symbol

32 Point symbols: accurate positions MAST Position of a point feature

33 † Point symbol: approximate position Mast ECDIS indicates approximate position only for wrecks, obstructions, islets and shoreline features.

Units Supplementary national symbols: a–m

40 km Kilometer(s)

41 m Meter(s)

42 dm Decimeter(s)

43 cm Centimeter(s)

44 mm Millimeter(s)

45 M International nautical mile(s) (1852m), sea mile(s) Mi NMi NM

46 Cable(s) (0.1M) cbl

B Positions, Distances, Directions, Compass

47 ft Foot/Feet

48 Fathom(s) fm

49 h Hour(s) hr

50 m min Minute(s) of time

51 s sec Second(s) of time

52 kn Knot(s)

53 t Ton(s), Tonnage (weight)

54 cd Candela(s)

Magnetic Compass Supplementary national symbols: n

60 Variation var VAR Varn Magnetic variation

61 Magnetic mag

62 Bearing brg

63 True T

64 Decreasing

65 Increasing

66 Annual change

67 Deviation dev

68.1 Note of magnetic variation, in

position

Cursor pick site for magnetic variation at a point

Cursor pick site for magnetic variation over an area

68.2 Note of magnetic variation, out

of position

1 0 2 0

7 0

1 1

1 6 0 170 19 0

2 0 0

2 5 0

2 9

3 4 0

3 50

18 0

2 7

3 0

M A G N E T I C

4 5 ' W ( 2 0 11)

ANNU A L D E C R E AS E

VAR

Positions, Distances, Directions, Compass B No. NOAA / NGA ECDIS

Compass rose, normal pattern (smaller patterns of compass rose may be used)

Magnetic variation (example):

VAR 4°15’W (2011) means magnetic variation was 4°15’W in 2011 ANNUAL DECREASE 8’ means annual change is 8’E or decreasing 8’ annually For 2012 the magnetic variation is 4°7’W

Cursor pick site for magnetic variation at a point

0 90

Isogonic lines, Isogonals

Cursor pick site for magnetic variation along a line

Varn - 3

82.1

82.2

B Positions, Distances, Directions, Compass

No. INT

Local Magnetic Anomaly (see Note)

Supplementary National Symbols a b c d e f g h i j k l m n

Description

Local magnetic anomaly:

Within the enclosed area the magnetic variation may deviate from the normal by the value shown

Local magnetic anomaly:

Where the area affected cannot

EH�HDVLO\�GH¿QHG��D�OHJHQG�RQO\�

is shown at the position

Square meter(s)

Cubic meter(s)

Inch(es)

Yard(s)

Statute mile(s)

Microsecond(s)

Hertz

Kilohertz

Megahertz

Cycles/second

Kilocycle(s)

Megacycle(s)

Ton(s) (U.S. short ton) (2,000lbs)

Degree(s)

NOAA NGA

LOCAL MAGNETIC LOCAL MAGNETIC

DISTURBANCE ANOMALY

(see note) (see note) m2 m3 in yd

St M St Mi μsec μs

Hz kHz

MHz cps c/s kc

Mc

T deg

Other NGA

LOCAL MAGNETIC DISTURBANCE

(see note)

ECDIS

Cursor pick site for magnetic anomaly along a line or over an area

Cursor pick site for magnetic anomaly at a point

Natural Features C

Coastline Supplementary national symbols: a–e

)RUHVKRUH�ĺ�,��-

1 Coastline, surveyed Coastline

2 Coastline, unsurveyed Coastline or shoreline construction of low accuracy in position

3 Cliffs, Steep coast high low

Presence of cliffs coincident with coastline is obtained by cursor pick

Sloping ground crest line distant from coastline, radar or visually conspicuous

Cliff as an area

Hillocks

Conspicuous hill or mountain top

Flat coast

Nature of coastline is obtained by cursor pick

Sandy shore

Stony shore, Shingly shore

Sandhills, Dunes

Conspicuous hill or mountain top

C Natural Features

Relief Supplementary national symbols: e–g

3ODQH�RI�UHIHUHQFH�IRU�KHLJKWV�ĺ�+

10 Contour lines with values and spot height 109 m

Elevation contour with spot height, contour value is obtained by cursor pick

11 Spot heights 119 m Position of an elevation or control point

Approximate contour lines with values and approximate height

109 m

Elevation contour with spot height, contour value is obtained by cursor pick

Form lines with spot height

Approximate height of top of trees (above height datum)

135 TT Approximate height of trees is obtained by cursor pick

River, Stream

River

Intermittent river

Water Features, Lava

22 Rapids, Waterfalls

Rapids

Waterfall

Waterfall, visually conspicuous

23 Lakes Lake

24 Salt pans

25 Glacier Continuous pattern for an ice area (glacier, etc.)

26 /DYD�ÀRZ

Vegetation Supplementary national symbols: i–t

30 Woods in general

Wooded

Line of trees

Wooded area

C Natural Features

31 Prominent trees (isolated or in groups)

31.1 Deciduous tree

Tree

31.2 Evergreen (except conifer)

31.3 Conifer

Vegetation, line of trees

31.4

31.5

31.6

31.7

31.8

Palm

Nipa Palm

Wooded area Casuarina

Filao

Eucalypt

Mangrove

Mangrove with coastline or shoreline construc tion of low accuracy in position

Marsh, Swamp, Reed beds Marsh with coastline or shoreline construction of low accuracy in position

Chart sounding datum line (surveyed) Uncovers

Approximate sounding datum line (inadequately surveyed)

Foreshore; Strand (in general);

Stones; Shingle; Gravel; Mud;

Sand

Mud

Breakers along a shore

(if extensive)

Breakers

Breakers

Supplementary National Symbols a b c d

Rubble

Hachures e f g i j k l m n o p q r s t

Shading

*UDVV¿HOGV

Bushes

Cypress

Grass

Eelgrass

Description

Deciduous woodland

Coniferous woodland

Tree plantation

&XOWLYDWHG�¿HOGV

3DGG\��ULFH��¿HOGV

Apparent shoreline

Vegetation or topographic (Feature Area Limit-in general)

NOAA

Grass

Eelgrass

NGA Other NGA

Marsh

Cypress

D Cultural Features

Settlements, Buildings

+HLJKW�RI�REMHFWV�ĺ�(�����������������������������/DQGPDUNV�ĺ�(

1 Urban area Built-up area

2 Settlement with scattered buildings

3 Settlement (on medium and small scale charts)

Name Built-up area as a point

4 Village Vil

5 Buildings Conspicuous single building

6 Important building in built-up area

Conspicuous single building in built-up area

7 Street name, Road name Street name is obtained by cursor pick

8 Ruin, Ruined landmark RuRuins Status of ruins is obtained by cursor pick

5RDGV��5DLOZD\V��$LU¿HOGV Supplementary National Symbols: a–c

10 Motorway, highway Road, track or path as a line

11 Road (hard surfaced)

Road as an area 12 Track, Path (loose or unsurfaced)

Cultural Features D

Other Cultural Features

Description

Railway, with station

Cutting

Embankment

Tunnel

$LUSRUW��$LU¿HOG

Vertical clearance above high water

Horizontal clearance

Fixed bridge with vertical clearance

NOAA NGA Other NGA ECDIS

Airport

FIXED BRIDGE

HOR CL 25 FT

VERT CL 6 M

VERT CL 20 FT

HOR CL 8 M

Railway, with station

Cutting

Embankment

Embankment, visually or radar conspicuous

Tunnel

Tunnel with depth below the seabed encoded

Airport as a point

Runway as a line

Airport area, with runway area and visually con spicuous runway area

Supplementary National Symbols: d–i clr 20.0 clr cl 20.0 clr op 20.0 sf clr 20.0

Vertical clearance Closed clearance Open clearance Safe clearance

Horizontal clearance is obtained by cursor pick clr 20.0 clr 20.0 Bridge

D Cultural Features

23.1 Opening bridge (in general) with

vertical clearance clr cl 8.2 clr op 20.0 clr cl 8.2 clr op 20.0

Opening bridge

23.2 Swing bridge with vertical

clearance

23.3 Lifting bridge with vertical

clearance (closed and open)

23.4

23.5

23.6

Bascule bridge with vertical clearance

Pontoon bridge clr 20.0 clr 20.0 Bridge

Draw bridge with vertical clearance clr cl 8.2 clr op 20.0 clr cl 8.2 clr op 20.0

Opening bridge

Transporter bridge with vertical

FOHDUDQFH�EHORZ�¿[HG�VWUXFWXUH

clr 20.0 clr 20.0 Bridge

Overhead transporter, Aerial cableway with vertical clearance clr 20.0 Aerial cableway clr 20.0 Aerial cableway, radar conspicuous

Overhead power cable with pylons and safe vertical clearance

OVERHEAD POWER CABLE

AUTHORIZED CL 140 FT

TOWER TOWER

sf clr 20.0 Transmission line sf clr 20.0 Transmission line, radar conspicuous

1RWH��7KH�VDIH�YHUWLFDO�FOHDUDQFH�DERYH�WKH�KHLJKW�GDWXP��DV�GH¿QHG�E\�WKH�UHVSRQVLEOH�DXWKRULW\��LV�JLYHQ�LQ�PDJHQWD�ZKHUH�NQRZQ��RWKHUZLVH�WKH�SK\VLFDO�YHUWLFDO�FOHDUDQFH�LV�VKRZQ�LQ�EODFN�DV�LQ�'�����DOVR�VHH� diagram at H 20).

Cultural Features D

No. INT Description NOAA

Overhead cable, Telephone line, Telegraph line with vertical clearance

Tel clr 20.0 clr 20.0

28 Overhead pipe with vertical clearance clr 20.0 clr 20.0

Supplementary National Symbols a b c d e f g h i

Pipeline on land

Highway markers

Railway (Ry) (single or double track) Railroad (RR)

Same grade

Ry above

Ry below

Abandoned railroad

Bridge under construction

Footbridge

Viaduct Viaduct

Fence

Power transmission line

21abt

NGA Other NGA

OVHD PIPE

VERT CL 6FT

ECDIS

Overhead cable

Overhead cable, radar conspicuous

Overhead pipeline

Overhead pipeline, radar conspicuous

Oil, gas pipeline, submerged or on land

Approximate vertical clearance

Conspicuous and Non-Conspicuous Features

There are 25 features for which ECDIS displays either a black symbol, if the feature is visually conspicuous, or a brown symbol if is not. Only conspicuous landmarks are depicted on NOAA paper charts and ENCs. Therefore, only the conspicuous symbol versions are shown in the symbol tables of U.S. Chart No. 1. Both versions of the symbols for these features are shown on this page.

Cairn

Chimney

Dish aerial

Dome

Flare stack

)RUWL¿HG�VWUXFWXUH

Hill or mountain top

Mast

Monument

Mosque or minaret

Position of a point feature

Radar scanner

Radio, television tower

5H¿QHU\

Religious building, Christian

Religious building, non-Christian

Silo

Single building

Tank

Tank farm

Tower

Water tower

Windmill

Windmotor

Wind generator farm

The seven symbols shown below represent features that only have a brown sym bol. There is no corresponding black, conspicuous symbol. The brown symbol is displayed regardless of the conspicuousness of the feature.

Cranes

)ODJVWDII��ÀDJSROH

Mangrove

Mine, quarry

Quarry

Timber yard

Tree

Landmarks E

3ODQH�RI�5HIHUHQFH�IRU�+HLJKW�ĺ�+������������������������������/LJKWKRXVHV�ĺ�3������������������������������%HDFRQV�ĺ�4

General

1 Examples of landmarks Tr MONUMENTTANK

Non-conspicuous point feature

Non-conspicuous building

Non-conspicuous water tower

Examples of conspicuous landmarks (On NOAA charts, a large circle with dot and capitals indicates that position is accurate; a small circle with lowercase indicates that position is approximate.)

SPIREEMPIRE STATE

BUILDING

CHIMNEYRADAR MAST

Conspicuous point feature

Conspicuous building

Conspicuous water tower

3.1 Pictorial sketches (in true

position)

The information symbol is displayed if a supplemental image is available, which may be accessed by cursor pick

3.2 Pictorial sketches (out of

position)

Landmarks

10.1

10.2

10.3

10.4

Height of top of a structure above height datum (30)

Height is obtained by cursor pick Height of structure above ground level (30)

Church Ch

Church as a point

Church as an area

Church tower

Church tower, spire, or domeChurch spire SpireSPIRE

Church cupola CupCUPOLA

Chapel Ch Chapel

E Landmarks

INTNo.

25.1

25.2

26.1

26.2

Description

Cross, Calvary

Temple

Pagoda

Shinto shrine, Joss house

Buddhist temple or shrine

Mosque, Minaret

Marabout

Cemetery

Tower

Water tower, Water tank on a tower

Chimney

Flare stack (on land)

Monument (including column, pillar, obelisk, statue)

Windmill

Windmill (without sails)

Wind turbine, Windmotor

Wind farm

Flagstaff, Flagpole

NOAA

Cem

TOWER

Tr

STANDPIPE

S’pipe

CHIMNEY

Chy

FLARE

MONUMENT

WINDMILL

WINDMOTOR

WIND FARM

FS

FP

NGA Other NGA

Tr

Wtr Tr

WTR TR

CHY

(208) (202)

Flare

Mon

Windmill

Windmotor

Wind Farm

FP

FS

ECDIS

Position of a point feature

Religious building, non-Christian

Mosque or minaret

Landmark area, type is obtained by cursor pick

Tower

Water tower

Chimney

Flare stack

Monument

Windmill, status of ruins is obtained by cursor pick

Wind motor

Wind generator farm

)ODJVWDII��ÀDJSROH

30.1

30.2

30.3

30.4

34.1

34.2

34.3

35.1

35.2

Description

Radio mast, Television mast

Radio tower, Television tower

Radar mast

Radar tower

Radar scanner

Radome

Dish aerial

Tanks

Silo

)RUWL¿HG�VWUXFWXUH��RQ�ODUJH�VFDOH�

charts)

Castle, Fort, Blockhouse (on small scale charts)

Battery, Small fort (on small scale charts)

Quarry (on large scale charts)

Quarry (on small scale charts)

Mine

NOAA

R MAST

TV MAST

R TR

TV TR

RADAR MAST

RADAR TR

DOME (RADAR)

Dome (Radar)

ANT (RADAR)

Ant (Radar)

TANK

SILO

ELEVATOR

Landmarks E

NGA Other NGA

TV Mast

R Mast

TV Tr

R Tr

Radar Mast

Radar Tr

RADOME

Radome

Tk

Elevator

Silo

ECDIS

Mast

Radio, television tower

Mast

Radar tower

Radar scanner

Dome

Dish aerial

Tank

Tank farm

Silo

)RUWL¿HG�VWUXFWXUH

)RUWL¿HG�VWUXFWXUH

Quarry area

Quarry

E Landmarks

37.1

Description NOAA NGA Other NGA ECDIS

Recreational vehicle site

Camping site (including recreational vehicles)

Facty

Well

Sch Sch

Hosp

Univ Univ

GabGAB

Tel

Corp

37.2

Supplementary National Symbols a b c d e f g h i k Tel Off l Magz m Govt Ho n Inst o Ct Ho p Pav q T r Ltd s Apt t Cap u Co v

Muslim shrine

Tomb

Watermill

Factory

Well

School

Hospital

University

Gable

Telegraph

7HOHJUDSK�RI¿FH

Magazine

Government house

Institute

Courthouse

Pavilion

Telephone

Limited

Apartment

Capitol

Company

Corporation

Ports F

Protective Structures Supplementary national symbols: a–c

1 Dike, Levee, Berm

Dike as a line

Dike as a line, conspicuous

Dike as an area

2.1 Seawall (on large scale charts)

Seawall

2.2 Seawall (on small scale charts)

3 Causeway Cswy

Causeway as a line

Causeway, covers and uncovers as a line

Causeway as an area

Causeway, covers and uncovers as an area

4.1 Breakwater (in general)

Bkw Breakwater as a line

Breakwater as an area

4.2 Breakwater (loose boulders, tetrapods, etc.)

4.3 Breakwater (slope of concrete or

masonry)

5 Training wall (partly submerged at high water) Training wall

F Ports

6.1

6.2

6.3

Harbor Installations

'HSWKV�ĺ�,������������������������������$QFKRUDJHV��/

11.1

11.2

11.3

Groin (always dry) Groin Groin (always dry)

Groin (intertidal) Groin Groin (intertidal)

Groin (always under water) Groin Groin (submerged)

LPLWV�ĺ�1������������������������������%HDFRQV�DQG�RWKHU�¿[HG�PDUNV�ĺ�4������������������������������0DULQD�ĺ�8

Fishing harbor Fishing harbor

Boat harbor, Marina Yacht harbor, marina

Yacht berths without facilities

Yacht club, Sailing club

Mole (with berthing facility)

Mole as a line

Mole as an area

Quay, Wharf Whf Wharf (quay)

Pier, Jetty Pier

Pier (jetty), promenade pier

Promenade pier

Pontoon

Pontoon as a line

Pontoon as an area

Landing for boats Ldg Lndg Landing

19.1

19.2 Visitors’ berth

Dolphin

Floating dock

Description ECDIS

NOAA NGA Other NGA

Steps, Landing stairs Steps

Designation of berth 3 A 3

Dol (Great Lakes) Dol

Dn

Dol

Deviation dolphin

Minor post or pile Pile (Great Lakes) Pile

Landing steps

Berth number Nr 3

Yacht harbor, marina

Mooring dolphin

Deviation mooring dolphin

Pile or bollard

Slipway, Patent slip, Ramp Slipway, ramp

Gridiron, Scrubbing grid Gridiron

Dry dock, Graving dock Dry dock

Floating dock as a line

Floating dock as an area

Non-tidal basin, Wet dock Wet dock and gate

Dock

Tidal basin, Tidal harbor

Dock, under construction or ruined

No.

29.1 Floating Barrier

29.2

33.1

33.2

INT Description

Floating barrier, e.g. oil barrier, security barrier

Oil retention barrier (high pressure pipe)

Works on land, with year date

Works at sea, Area under reclamation, with year date

Works under construction, with year date

Ruin

Ruined pier, partly submerged at high water

Hulk

NOAA

Hk

NGA Other NGA

Floating Barrier

Under construction

(2011) Under constr

Under constr (2011)

Ruins

Pier

Hk

ECDIS

Floating hazard

Boom Floating oil barrier, oil retention (high pressure pipe)

%RRP��ÀRDWLQJ�

obstruction

Floating oil barrier, oil retention (high pressure pipe)

Ruin or works under construction

Year and condition of under construction or ruin is obtained by cursor pick

Pier, ruined and partly submerged

Hulk

Canals, Barrages Supplementary national symbol: d

&OHDUDQFHV�ĺ�'������������������������������6LJQDO�6WDWLRQV�ĺ�7������������������������������&XOWXUDO�)HDWXUHV�ĺ�%

40 Canal

Canal

Ditch Canal

41.1 Lock (on large scale charts)

Con tro l Cen te r

Lo ck

1Lo ck

Tid e St a

Tide Sta Lock gate as a line

Lock gate as an area

41.2 Lock (on small scale charts)

Ditch Sluice

Canal Lock

(Tidegate, Floodgate)

Navigable lock gate

42 Caisson, Gate

Non-navigable lock gate

Caisson as a line

Caisson as an area

43 Flood barrage

Non-navigable lock gate

Flood barrage as a line

Flood barrage as an area

44 'DP��:HLU��GLUHFWLRQ�RI�ÀRZ�

shown is left to right)

Dam as a line

Dam as an area

Transhipment Facilities Supplementary national symbols: e–f

5RDGV�ĺ�'������������������������������5DLOZD\V�ĺ�'������������������������������7DQNV�ĺ�(

50 Roll-on, Roll-off (RoRo), Ferry Terminal RoRo terminal

51 Transit shed, Warehouse (with designation)

Conspicuous single building, designation is obtained by cursor pick

52 Timber yard †

Timber yard as a point

Timber yard as an area

53.1 Crane with lifting capacity, Traveling crane (on railway)

Lifting capacity is obtained by cursor pick

Crane as a point

Crane as an area

53.2 Container crane (with lifting

capacity) †

Cr an e

C rane

Crane, visually conspicuous as an area

53.3 Sheerlegs (conspicuous)

Public Buildings Supplementary national symbol: g

60 +DUERUPDVWHU¶V�RI¿FH Hbr Mr Conspicuous single building

61 &XVWRP�RI¿FH Cus Ho

Conspicuous single building

Customs

62.1 +HDOWK�RI¿FH��4XDUDQWLQH�

building Health Office †

Conspicuous single building62.2 Hospital Hosp

63 3RVW�RI¿FH PO

c

Supplementary National Symbols a b d e f g

Ports F

Description NOAA NGA Other NGA ECDIS

Jetty (partly below MHW)

Submerged jetty

Jetty (on small scale charts)

Pump-out facilities

4XDUDQWLQH�RI¿FH Quar†

Mooring Canal

Conveyor

Mooring Canal

Subm Jetty

Submerged Jetty

P

Conveyor

H Tides, Currents

Terms Relating to Tidal Levels

INT Terms

No. Term Description

1 CD Chart Datum, Datum for sounding reduction

2 LAT Lowest Astronomical Tide

3 HAT Highest Astronomical Tide

4 MLW Mean Low Water

5 MHW Mean High Water

6 MSL Mean Sea Level

7 Height datum, Land survey datum

8 MLWS Mean Low Water Springs

9 MHWS Mean High Water Springs

10 MLWN Mean Low Water Neaps

11 MHWN Mean High Water Neaps

12 MLLW Mean Lower Low Water

13 MHHW Mean Higher High Water

14 MHLW Mean Higher Low Water

15 MLHW Mean Lower High Water

16 Sp Spring tide

17 Np Neap tide

Supplementary National Terms (see l–t for other terms and symbols)

No. Term Description a HW High Water b HHW Higher High Water c LW Low Water d LWD Low Water Datum e LLW Lower Low Water f MTL Mean Tide Level g ISLW Indian Spring Low Water h HWF&C High Water Full and Change (Vulgar establishment of the port) i LWF&C Low Water Full and Change j CRD Columbia River Datum k GCLWD Gulf Coast Low Water Datum

Tides, Currents H

No.

Tidal Levels and Charted Data

7LGH�*DXJH�ĺ�7

Planes of reference are not exactly as shown below for all charts.

Topographic contoursCharted vertical clearance Charted vertical

MHW

MHHW

Height of tide

MLW

MLLW (Chart datum)

Charted depth (sounding)

Drying height

Sea surface at any time

Charted LW (drying) line clearance

Overhead power cable

They are usually defined in notes under chart titles.

Safe vertical clearance (magenta)

Charted HW (coast) line

Observed depth

(7)

(12)

Spot height

MSL

Elevation of light source

Islet height

Notes:

1) The numbers ������������� and (12), shown above, are examples of how spot heights, topographic contour labels, islet heights and drying heights appear on NOAA paper charts. The numbers are enclosed in

(parentheses) if the value is offset into the water to more clearly show the islet or rock.

2) On NOAA charts, except for lake charts, the HW (coast) line is equal to the MHW line.

Tide Tables

No. INT Description

Tabular statement of semi-diurnal or diurnal tides

Note: The order of the columns of levels will be the same as that used in national tables of tidal predictions.

NOAA

7,'$/�,1)250$7,21

3/$&(

1$0( �/$7�/21*�

%DOWLPRUH��)W��0F+HQU\ ������

1������

Annapolis, U.S. Naval Academy ������ 1������

:DVKLQJWRQ�'�&���:DVKLQJWRQ�&KDQQHO ������

1������

+HLJKW�UHIHUUHG�WR�GDWXP�RI�VRXQGLQJV��0//:�

0HDQ�+LJKHU�

High Water feet

1.7

1.4

3.2

0HDQ� 0HDQ�

High Water /RZ�:DWHU feet feet

1.4 0.2

1.2 0.2

2.9 0.1

'DVKHV�������ORFDWHG�LQ�GDWXP�FROXPQV�LQGLFDWH�XQDYDLODEOH�GDWXP�YDOXHV�IRU�D�WLGH�VWDWLRQ��5HDO�WLPH�ZDWHU� levels, tide predictions, and tidal current predictions are available on the Internet from

KWWS���WLGHVDQGFXUUHQWV�QRDD�JRY�

�1RY������

H Tides, Currents

Tidal stream table

Tidal Streams and Currents

%UHDNHUV�ĺ�.������������������������������7LGH�*DXJH�ĺ�7��

No. INT

3.0 kn 40

2.8 kn 41

Description

Flood tide stream with rate

Ebb tide stream

NOAA NGA Other NGA

ECDIS

Point or area for which a tidal stream table is available

Boundary of an area for which there is tidal information

Supplementary national symbols: m–t

ECDIS

Flood stream, rate at2.5 kn spring tides

Current or tidal stream whose direction is not known

Boundary of an area for which there is tidal information

Ebb stream, rate at2.5 kn spring tides

Current or tidal stream whose direction is not known

Boundary of an area for which there is tidal information

Tides, Currents H

Description NOAA NGA Other NGA ECDIS

Current in restricted waters

2.5 kn Non-tidal current Ocean current with rates and seasons (see Note)

Overfalls, tide rips, races

Tide rips symbol used only in small areas Overfalls, tide rips;

eddies; breakers as point, line, and area

Eddies Eddies symbol used only in small areas

Position of tabulated tidal stream data with designation

Point for which a tidal stream table is available

Offshore position for which tidal levels are tabulated

Stream Str

Current, general, with rate 2 kn

Velocity, Rate vel

Knots kn

Height ht

Flood À

New moon

Full moon

Current diagram

10 11

Gulf Stream Limits Approximate location of Axis of Gulf Stream

Supplementary National Symbols (Supplementary national terms relating to tidal levels are listed after H 17) l m n o p q r s t u

I Depths

General

1 ED Existence doubtful Sounding of low accuracy

2 SD Sounding of doubtful depth

Sounding of low accuracy

Underwater hazard with depth greater than 20 meters

Isolated danger of depth less than the safety contour

3.1 Rep 5HSRUWHG��EXW�QRW�FRQ¿UPHG

Sounding of low accuracy

Point feature or area of low accuracy

3.2 5HS������� Reported (with year of report), EXW�QRW�FRQ¿UPHG

Low accuracy line demarking area wreck or obstruction

Low accuracy line demarking foul area

5HSRUWHG��EXW�QRW�FRQ¿UPHG�

sounding or danger (on small scale charts only)

Obstruction, depth not stated

Sounding of low accuracy

Underwater hazard with depth of 20 meters or less

Underwater hazard with depth greater than 20 meters

Isolated danger of depth less than the safety contour

Point feature or area of low accuracy

I NGA Other NGA

Depths

No. INT

Soundings

3ODQH�RI�5HIHUHQFH�IRU�'HSWKV�ĺ�+������������������������������3ODQH�RI�5HIHUHQFH�IRU�+HLJKWV�ĺ�+

Description

Sounding in true position (NOAA shows fathoms and feet with vertical numbers and meters with sloping numbers)

Sounding out of position

Least depth in narrow channel

No bottom found at depth shown

Soundings which are unreliable or taken from a smaller scale source (NOAA shows unreliable soundings in fathoms and feet with sloping numbers and in meters with vertical numbers)

Drying heights and contours above chart datum

Natural watercourse (in intertidal area), tidal gully, tideway

NOAA

63 6 3 4 4

(23)

(4 )7

ECDIS

Supplementary national symbols: a–c

Depths are always shown in their true position in

ECDIS

Sounding shoaler than or equal to safety depth

Sounding deeper than safety depth

Status of no bottom found is obtained by cursor pick

Sounding of low accuracy

Drying height, less than or equal to safety depth

Tideway

Depths in Fairways and Areas Supplementary national symbols: a, b

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20 Limit of dredged area

Dredged area

Depth, date of latest survey and other information is obtained by cursor pick

Unsurveyed

Inadequately surveyed

Depths (see ZOC diagram)

Unsurveyed (see note)

Dredged channel or area with depth of dredging in meters and decimeters

Dredged channel or area with depth and year of the latest control survey

30 FEET APR 2011

30 FEET

APR 2011

Dredged channel or area with maintained depth

Area swept by wire drag. The depth is shown at chart datum.

(The latest date of sweeping is shown in parentheses.)

7 21

30 (1930) swept to 9.6 Swept area

(see note)

Unsurveyed or inadequately surveyed area; area with inadequate depth information 1113

Unsurveyed rky

Incompletely surveyed area

Unsurveyed area

ECDIS depth related symbols closely resemble their paper chart counterparts; however, ECDIS provides valuable additional information to mariners that paper charts cannot.

Soundings ECDIS enables mariners to set their own-ship “safety depth.” If no depth is set, ECDIS sets the value to 30m. Soundings equal to or shoaler than the safety depth are shown in black;

deeper soundings are displayed in a less conspicuous gray. Fractional values are shown with subscript numbers of the same size.

Depth Contours & Depth Areas Depth contours in ECDIS are portrayed with a thin gray line. Each pair of adjacent depth contours is used to create depth area features. These are used by ECDIS to tint different depth levels and to initiate alarms when a ship is headed into unsafe water.

Depth Contour Labels

ECDIS depth contour labels are not centered and oriented along iso lines as they appear on paper charts. They are displayed upright and may appear either on or next to the contour lines that they describe.

The labels are black and the same size as soundings, but the labels have a light “halo” to set them apart. The graphic to the left shows depth labels and soundings both deeper and shoaler than the safety depth.

Note that depths on NOAA paper charts and ENCs are usually com piled in fathoms and feet. Because ECDIS displays depths in meters, soundings and contour lines often show fractional meter values. The “own-ship safety contour” (described below) is always displayed, but mariners may choose to have all other depth contours turned off.

Safety Contour ECDIS uses a “safety contour” value to show an extra thick line for the depth contour that separates “safe water” from shoaler areas. If the mariner does not set an own-ship safety contour value, ECDIS sets the value to 30m. If the ENC being displayed does not have a contour line equal to the safety contour depth value set by the mariner, then ECDIS sets the next deeper contour as the safety contour. Depending on the contour intervals used on individual ENCs, ECDIS may set different safety contours as a ship transits from one ENC to another. ECDIS will initiate an alarm if the ship’s future track will cross the safety contour

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Two or Four Tints for Shading Depth Areas ECDIS tints all depth areas beyond the (green tinted) foreshore in either one of two or one of four shades of blue. This is similar to the convention used for paper charts, but the depths used to change from one tint to another are based on the safety contour and thus “customized” for each…