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NOAA ENC® Online for U.S. Waters
Raster navigational chart 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.

While features in a single NOAA ENC represent the geographic region that is depicted in that particular ENC cell, NOAA ENC Online provides a continuous depiction of the U.S. coastal waters as displayed on electronic chart systems. (See U.S. Chart No. 1 for legend.)

ENCs are updated weekly and include all of the latest Notice to Mariners corrections.


The NOAA ENC Online viewer is powered by Esri Maritime Chart Server technology. The technology provides features that can be leveraged in various GIS and OGC WMS compliant applications. ENC Online is built on Esri’s ArcGIS API for JavaScript, which highlights many of the features.

Generic features

  • Displays the S-57 datasets using S-52 presentation library specification edition 3.4.
  • Provides indexing for the S-57 attribute Object Name (OBJNAM)
  • Provides access to S-57 attribute information
  • Links external files to S-57 attributes
  • Allows for the best scale data to be displayed similar to how an ECDIS displays best scale data based on the map scale as a user zooms in and out of the display.

Web application features

  • Search entire service by object name (OBJNAM)
  • Identify features and display their attributes in a pick list
  • Zoom to selected features
  • Change basemaps
  • Measure area and distance, get coordinates
  • Set safety, shallow and deep depth contours
  • Switch between simplified and traditional symbols
  • Change the background colors of the display
  • Turn off certain features or adjust transparency

Users who want to display NOAA ENC Online as a backdrop for GIS applications should use:

Esri REST Service
OGC WMS 1.3 Compatible

Please note that certain functionality, such as identify and search, may not be supported by other GIS applications.

Note: This application is not optimized for mobile web browsing.

For more information about Esri technology, email maritime@esri.com.

NOAA ENC Online is not certified for navigation.

Screen captures of the ENCs displayed here do NOT fulfill chart carriage requirements for regulated commercial vessels under Titles 33 and 46 of the Code of Federal Regulations.

Please submit comments to suggest improvements to the service.


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