This page has Inland ENC 2.3 standard data (S-57) and additional GIS formats for download based on the users' needs. The S-57 charts are updated monthly with USCG Local Notices to Mariners information and new feature source data as appropriate.
Users of IHO S-57 format (Inland 2.3 Standard) are mariners who require an Electronic Chart System (ECS) to display the charts. These data follow strict display rules adhered to by the maritime community. These data can also be displayed using free viewers from several vendors.
A Shapefile is a digital vector (non-topological) storage format for storing geometric location and associated attribute information. The Shapefile format is created by ArcView and can be used by ArcView, ARC/INFO, ArcGIS and other widely used GIS software (source:USGS). Each IENC charts has been converted to SHP format to accomodate users' GIS needs for IENC data.
KML, or 'Keyhole Markup Language', is an XML grammar and file format for modeling and storing geographic features such as points, lines, images, polygons, and models for display in Google Earth, Google Maps and other applications. Our IENC KML files are sybmolized equivalents to the original S-57 charts. Users may query feature class attributes to uncover more information.
US Coast Guard buoys are available as an overlay for users. The buoys are available in S-57 format, shapefiles, or KML. The buoys are available as one large file with about 12,500 buoys covering the entire inland waterway system. Coming soon users will be able to download only the areas they need on the rivers.
An overlay of Southwest Pass data (Soundings and Contours) of the Mississippi River is available for download in S-57 format only. Data are updated weekly to assess channel condition changes.
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.