These data products are subject to change. Users should periodically check this website, or contact the U.S. Army Geospatial Center, for revised IENCs or updates. Any questions or comments relating to these IENCs or charts on the Mississippi and Ohio Rivers and their tributaries, should be forwarded to the E-Charting Webmaster. The contact number is: (703) 428-3682.

Following the pilot projects effort, development of initial IENCs to cover most of the Mississippi and Ohio Rivers began in Fiscal Year 2002. A Content Specification was drafted that defines all the features and attributes for the IENCs and maps the information to the S-57 structure.

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