Two ENC display services provide simple HTTP interfaces for user applications to request geo-registered nautical chart images from NOAA databases for display in online and offline applications for which a basemap of nautical chart data is desired, including GIS, web-based, and mobile mapping applications.

The chart images are rendered from the latest NOAA electronic navigational chart (NOAA ENC®) data. The ENC data and the chart images derived from it are updated weekly. Each display service portrays the ENC data with a different symbology set.

The ECDIS Display Service uses symbology developed by the International Hydrographic Organization (IHO) for the display of ENC data on Electronic Chart Display and Information Systems (ECDIS) that large ocean- going vessels and many smaller commercial ships use for navigation. This symbol set is commonly referred to by its IHO specification number, "S-52," or as "ECDIS symbology."

The ENC Viewer portrays ENC data using this ECDIS symbology.

ECDIS Display Service ECDIS Display Service rendering of ENC along the Columbia River with symbology specified by the IHO. https://www.nauticalcharts.noaa.gov/data/gis-data-and-services.html#enc-display-services

NOAA's Electronic Navigational Charts (NOAA ENCs) have been developed to support the marine transportation infrastructure and coastal management. The NOAA ENCs are in S-57, a data standard developed by the International Hydrographic Organization (IHO) to be used for the exchange of digital hydrographic data. NOAA ENCs can be used in Geographic Information Systems, (GIS) allowing for broader public access. Many GIS's, however cannot read an ENC's native S-57 format to address this problem. NOAA's ENC Direct to GIS web portal provides comprehensive access to display, query, and download all available large scale NOAA ENC data in a variety of GIS/CAD formats for non-navigational purposes using Internet mapping service technology. Nautical chart features contained within an NOAA ENC provide a detailed representation of the U.S. coastal and marine environment. This data includes coastal topography, bathymetry, landmarks, geographic place names and marine boundaries. Features in an NOAA ENC are limited in that they only represent the geographic region that is depicted in that particular NOAA ENC. By aggregating nautical features from all NOAA ENCs in the creation of GIS data, a contiguous depiction of the U.S coastal and marine environment is achieved.

The National Oceanic and Atmospheric Administration (NOAA) Electronic Navigational Charts (ENC), found in the A-16 National Geospatial Data Asset Portfolio, support real-time navigation as well as collision and grounding avoidance needs of the mariner, and accommodate a real-time tide and current display capability that is essential for large vessel navigation. The NOAA ENC will support all types of marine navigation by providing the official database for electronic charting systems, including the Electronic Chart Display and Information System. NOAA ENCs will also provide fully integrated vector base maps for use in geographic information systems that are used for coastal management or other purposes. The NOAA ENCs are in the International Hydrographic Office S-57 international exchange format and comply with the ENC product specification. The ENC Harbor map service displays data compiled for ENC products with a scale range from street level (1:5,000) to town level (1:50,000).The ENC data used within this application will be updated weekly. This map layer is not intended for navigation purpose.Thumbnail image courtesy of: Kartverket

NOAA Electronic Navigational Charts (NOAA ENC®) are in International Hydrographic Organization (IHO) S-57 format, which is the standard used for the exchange of digital hydrographic data. NOAA ENC Online optimizes the viewing of the entire ENC suite, using the display rules defined by the IHO S-52 Specifications for Chart Content and Display Aspects of ECDIS.

NOAA's ENC Direct to GIS web portal provides comprehensive access to display, query, and download all available NOAA ENC data in a variety of GIS/CAD formats for non-navigational purposes using Internet mapping service technology. An area of the bottom of a body of water which has been deepened by dredging.(IHO Dictionary, S-32, 5th Edition, 1462)

The NOAA ENC data are in International Hydrographic Organization (IHO) S-57 format, which is the data standard for the exchange of digital hydrographic data. Nautical chart features contained within a NOAA ENC provide a detailed representation of the U.S. coastal and marine environment. This data includes coastal topography, bathymetry, landmarks, geographic place names, and marine boundaries. Features in a NOAA ENC are limited in that they only represent the geographic region depicted in that particular ENC. Aggregating nautical features from all NOAA ENCs in the creation of GIS data results in a contiguous depiction of the U.S. coastal and marine environment.To learn more about S-57, visit the IHO website.For questions or comments, contact us.File naming conventions and scale bandsENC Direct to GIS data is organized by scale band, and there are six scale bands available: Overview, General, Coastal,Approach, Harbour, and Berthing.SCALE RATIOS:Overview scale band consists of ENC files with a scale band of smaller than 1:1,500,000. General scale band consists of ENC files with a scale band from 1:600,001 – 1:1,500,000. Coastal scale band consists of ENC files with a scale band from 1:150,001 – 1:600,000. Approach scale band consists of ENC files with a scale band from 1:50,001 – 1:150,000. Harbour scale band consists of ENC files with a scale band from 1:5,000 – 1:50,000. Berthing scale band consists of ENC files with a scale band of larger than 1:5,000. The ENC filename is stored in the attribute named DSNM from the “coverage_area” feature layer. The third character within the filename is a numeric value referencing to the following scale band category. For example, a filename of US2EC02M.000 indicates that it is within the General scale band category.1 = Overview 2 = General 3 = Coastal 4 = Approach 5 = Harbour 6 = BerthingTo learn more about the object attributes for each S-57 object, see the S-57 Object Catalogue.

The NOAA ENC data are in International Hydrographic Organization (IHO) S-57 format, which is the data standard for the exchange of digital hydrographic data. Nautical chart features contained within a NOAA ENC provide a detailed representation of the U.S. coastal and marine environment. This data includes coastal topography, bathymetry, landmarks, geographic place names, and marine boundaries. Features in a NOAA ENC are limited in that they only represent the geographic region depicted in that particular ENC. Aggregating nautical features from all NOAA ENCs in the creation of GIS data results in a contiguous depiction of the U.S. coastal and marine environment.To learn more about S-57, visit the IHO website.For questions or comments, contact us.File naming conventions and scale bandsENC Direct to GIS data is organized by scale band, and there are six scale bands available: Overview, General, Coastal,Approach, Harbour, and Berthing.SCALE RATIOS:Overview scale band consists of ENC files with a scale band of smaller than 1:1,500,000. General scale band consists of ENC files with a scale band from 1:600,001 – 1:1,500,000. Coastal scale band consists of ENC files with a scale band from 1:150,001 – 1:600,000. Approach scale band consists of ENC files with a scale band from 1:50,001 – 1:150,000. Harbour scale band consists of ENC files with a scale band from 1:5,000 – 1:50,000. Berthing scale band consists of ENC files with a scale band of larger than 1:5,000. The ENC filename is stored in the attribute named DSNM from the “coverage_area” feature layer. The third character within the filename is a numeric value referencing to the following scale band category. For example, a filename of US2EC02M.000 indicates that it is within the General scale band category.1 = Overview 2 = General 3 = Coastal 4 = Approach 5 = Harbour 6 = BerthingTo learn more about the object attributes for each S-57 object, see the S-57 Object Catalogue.

This tile service was created using the mcstpk.exe functionality from ArcGIS Maritime server extension. The tile package was created using publicly available S-57 ENC data downloaded from NOAA's ENC download site on May 6th, 2021.Level 0 - 18 was generated from these S-57 datasets and published to this service. Not all levels however have been published. Those that have been published are available for download.To learn more about this product visit ArcGIS Maritime.

The NOAA Chart Display Service (NCDS) renders NOAA electronic navigational chart (NOAA ENC®) data with “traditional paper chart” symbology in online and offline applications for which a basemap of nautical chart data is desired, including GIS, web-based, and mobile mapping applications.The service uses symbols, labels, and color schemes familiar to those who have used NOAA paper nautical charts or the NOAA Custom Chart application. NCDS is available as Esri REST Map Service, OGC Web Map Service (WMS), and MBTiles formats.The ENC data in the service are updated weekly and include all of the latest Notice to Mariners corrections.

Electronic Navigational Charts (ENC) are vector data sets that support all types of marine navigation. Originally designed for large commercial vessels using a sophisticated navigational computer called an Electronic Chart Display and Information System (ECDIS), ENCs are now also being used on simpler electronic chart systems and “chart plotters” on many types of ships and by recreational boaters. NOAA ENCs help provide real-time ship positioning, as well as collision and grounding avoidance.The NOAA Chart Display Service renders NOAA Electronic Navigational Chart (ENC) data with "traditional paper chart" symbols, labels, and color schemes familiar to those who have used NOAA paper nautical charts or the NOAA Custom Chart application.NOAA ENCs comply with the International Hydrographic Organization ENC Product Specification. ENCs are produced around the world by many different countries’ national hydrographic or charting agencies. NOAA maintains more than 1,000 NOAA ENC® datasets over U.S. coastal waters and the Great Lakes.Free updates for NOAA ENCs are available weekly, which provide critical changes as well as the routine addition of newly compiled data, such as hydrographic or shoreline surveys. The NOAA Weekly Chart Updates page shows the areas that have changed on each ENC since its last new edition was published.ENCs also provide vector base maps for use in geographic information systems (GIS) that are used for coastal management and other purposes. The NOAA ENC Direct to GIS service supports extracting ENC data into GIS supported formats.Note: This layer is a feature service, which means it can be used for visualization and analysis throughout the ArcGIS Platform. This layer is not editable.

This dataset displays the locations of permanently moored ships. NOAA ENC Direct to GIS Internet Mapping Service is designed to allow for the visualization, querying and downloading of NOAA's Electronic Navigational Chart's (NOAA ENC) data in common Geographic Information System (GIS) formats for purposes outside of navigation. NOAA ENC Direct to GIS data is not intended for navigational purposes. This data is provided for use in GIS software packages for coastal planning and research.View Dataset on the Gateway

The Electronic Navigational Charts (ENC) market is experiencing robust growth, driven by increasing maritime traffic, stringent safety regulations, and the rising adoption of advanced navigation technologies. The market size in 2025 is estimated at $1.5 billion, exhibiting a Compound Annual Growth Rate (CAGR) of 7% from 2025 to 2033. This growth is fueled by several key factors. Firstly, the mandatory use of ENCs by many maritime authorities is a significant driver. Secondly, the integration of ENCs with other navigational systems, such as Electronic Chart Display and Information Systems (ECDIS), enhances safety and efficiency, leading to wider adoption. Thirdly, the continuous development of more accurate and detailed chart data, coupled with improvements in software functionality, contributes to market expansion. Technological advancements such as improved sensor integration, real-time updates, and improved data visualization capabilities further bolster this growth trajectory. Segment-wise, the software component is expected to witness significant growth due to the increasing demand for advanced features and functionalities within ECDIS systems. Geographically, North America and Europe currently hold the largest market shares, owing to established maritime industries and robust regulatory frameworks. However, the Asia-Pacific region is projected to exhibit the highest growth rate during the forecast period due to rapid economic development, increasing maritime trade, and investments in port infrastructure. While challenges such as high initial investment costs for ECDIS systems and the need for continuous data updates exist, the overall market outlook for ENCs remains highly positive, driven by the imperative for safe and efficient maritime navigation.

This dataset displays sewer outfalls on Long Island represented here by pipelines on navigational charts in the Approach scale. NOAA ENC Direct to GIS Internet Mapping Service is designed to allow for the visualization, querying and downloading of NOAA's Electronic Navigational Chart's (NOAA ENC) data in common Geographic Information System (GIS) formats. NOAA ENC Direct to GIS data is not intended for navigational purposes. This data is provided for use in GIS software packages for coastal planning and research. Additional Source Info: https://encdirect.noaa.gov/ View Dataset on the Gateway

This file provides information on the location and status of marine navigational lights. This information was created by, and is maintained by, NOAA Office of Coast Survey. Data is frequently updated, so for most recent data and information, the NOAA Office of Coast Survey website should be referenced (http://www.nauticalcharts.noaa.gov/index.html). This data is NOT to be used for navigational purposes, but can provide the user with powerful querying ability within the GIS environment. Although these data were derived from the NOAA ENC S-57 data files, which are designed for navigational use, the aggregation of this data into a GIS makes this data only suitable for visualization and querying. To provide the user with information on the status and location of marine navigational lights. These data were created from the 5th NOAA classification of ENCs: these are the harbor charts with scales ranging from 1:50,000 or larger. For more information on this classification scale, and others, please visit the website link provided in the above Abstract section. Intended for visualization purposes only; not appropriate for navigational use.

This layer is sourced from maritimeboundaries.noaa.gov.

The ENC_General map service displays ENC data within the scale range of 1:600,001 and 1:1,500,000. The ENC data will be updated weekly. This map service is not intended for navigation purpose.

This layer is a component of Bands 4 and 5.

The ENC_Approach map service displays data compiled for ENC products with a scale range of 1:50,001 and 1:150,000. The ENC data used within this application will be updated weekly. This map service is not intended for navigation purpose.

The Inland Electronic Navigational Charts (IENC) dataset is updated bi-monthly by the US Army Corps (USACE)/Army Geospatial Center (AGC), and part of U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). There is a partial delivery on the 1st and 15th business day of a month. If there is a need for a special chart delivery, occasionally there will be updates outside of the delivery cycle. The charts with data changes are released either as new editions or updates to existing IENCs on a regular delivery cycle. These IENCs were developed from available data used in maintenance of Navigation channels. These vector data, that make up the charts, can be downloaded as a geodatabase here: https://ienccloud.us/ienc/products/files/U37/ienc_master_dataset_gdb/USACE_IENC_Master_Service_gdb.zip. In addition, web mapping services of the feature classes/datasets can be found here: https://ienccloud.us/arcgis/rest/services/IENC_Feature_Classes. Users of these IENCs should be aware that some features and attribute information could have significant inaccuracies due to changing waterway conditions, inaccurate source data, or approximations introduced during chart compilation. Caution is urged in use of these IENCs or derived products for navigation planning or operation, or any decisions pertaining to or affecting safety of vessel operation. Only charts downloaded from the USACE chart server, https://ienccloud.us, and used in an Electronic Chart Display Information System (ECDIS) or Electronic Chart System (ECS), or official government chart books are suitable for navigation.

This dataset displays areas where mariners have to be made aware of circumstances influencing the safety of navigation. NOAA ENC Direct to GIS Internet Mapping Service is designed to allow for the visualization, querying and downloading of NOAA's Electronic Navigational Chart's (NOAA ENC) data in common Geographic Information System (GIS) formats for purposes outside of navigation. NOAA ENC Direct to GIS data is not intended for navigational purposes. This data is provided for use in GIS software packages for coastal planning and research.View Dataset on the Gateway

This layer is a component of Bands 4 and 5.

The ENC_Approach map service displays data compiled for ENC products with a scale range of 1:50,001 and 1:150,000. The ENC data used within this application will be updated weekly. This map service is not intended for navigation purpose.

This file provides information on the location and status of beacons. This information was created by, and is maintained by, NOAA Office of Coast Survey. Data is frequently updated, so for most recent data and information, the NOAA Office of Coast Survey website should be referenced (http://www.nauticalcharts.noaa.gov/index.html). This data is NOT to be used for navigational purposes, but can provide the user with powerful querying ability within the GIS environment. Although these data were derived from the NOAA ENC S-57 data files, which are designed for navigational use, the aggregation of this data into a GIS makes this data only suitable for visualization and querying. To provide the user with information on the status and location beacons. These data were created from the 5th NOAA classification of ENCs: these are the harbor charts with scales ranging from 1:50,000 or larger. For more information on this classification scale, and others, please visit the website link provided in the above Abstract section. Intended for visualization purposes only; not appropriate for navigational use.