Nautical Charts (ENCs)
To translate the ENC products for use in a GIS you'll need the ENC
Data Handlers from the NOAA Coastal Services Center, or you can use the ENC
Direct server at the Office of Coast Survey to download ENC spatial data
in a variety of popular spatial formats. If you have an Arc/Info license for ArcGIS, you can use the Import from S57 (Coverage) tool in ArcToolbox.