GIS & Other Products  
  Products for GIS  
     •   NOAA ENC® Direct to GIS  
     •   Raster Navigational Charts: NOAA RNC®  
     •   U.S. Maritime Zones/Boundaries  
     •   Law of the Sea  
     •   nowCOAST  
  Historical Products  
     •   Historical Maps and Charts  
  GIS Services and Tools 
     •   VDatum Transformation Tool  
     •   Web Mapping and Feature Services  
     •   ENC Handler for ArcMap  
     •   North Amer. Horiz. Datum Conversion Utility  
     •   Seamless Raster Chart Server & Web Map Services  
  Learn About  
     •   Law of the Sea  
     •   Differences Between ENC and ENC Direct to GIS  
     •   Maritime Limits White Paper  
     •   Datums and Transformations  
     •   Geospatial Applications of Hydrodynamic Models  
  Data Portals 
     •   nowCOAST: Real-Time Coastal Data Map Portal  
     •   NOS Data Explorer  
     •   NOAA's National Geophysical Data Center  
     •   NOAA's Coastal Services Center  
     •   Technical Reports & Publications  

NOAA ENC Direct to GIS
ENC Direct to GIS Banner Display, query, and download all available NOAA ENC data in a variety of GIS/CAD formats, using Internet mapping service technology.


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. In ENC Direct to GIS, Coast Survey has translated the data from S-57 to a GIS-friendly format.

While features in a single NOAA ENC represent the geographic region that is depicted in that particular ENC cell, ENC Direct provides a continuous depiction of the U.S. coastal and marine environment.

Basic structure of NOAA ENC data
An ENC contains attributed vector spatial data of nautical chart features. Nautical chart features are organized in S-57 object classes. Attributes in an ENC further describe each nautical feature. Each ENC object class has predefined geometry types associated with it, e.g., point, line, area (polygon in ENC Direct to GIS). For example, the land area object class has both point and polygon geometry. An ENC can contain any of the predefined IHO object classes and attributes.

ENC Direct to GIS screen shot

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