Anyone can access the navigation charts for these rivers, which show depth contours, buoys, lights, known hazards, and reference landmarks. You can activate the depth contours from Settings > Navigation > Navigation chart settings > Sonarchart. Rivers included in the Inland Electronic Navigation Chart (IENC) program include the Allegheny River, Arkansas River, Atchafalaya River, Black Warrior-Tombigbee Rivers, Cumberland River, Green River, Illinois River, Kaskaskia, Kanawha River, Lower Mississippi River, Missouri River, Monongahela River, Ohio River, Ouachita River, Red River, Tennessee River (including the Tellico, Hiwassee, Clinch and Emory Rivers), Tennessee-Tombigbee Waterway, Upper Mississippi River, and the White River. Lowrance Embedded Charts: Lowrance, B&G, Simrad: Furuno, Raymarine, many more : Full Featured Vector Charts: High-Resolution Bathymetry: Genesis Data : Custom Depth Shading : Subscription-Free Easy Routing Tides & Currents: Detailed Marina Port Plans: Multilanguage : Marine Protected Areas 12 Months' Free Online Updates : C-MAP Survey. America’s inland waterways move millions of tons of commodities every year, and the work of surveying, charting, and dredging sediment is continually ongoing due to the dynamic conditions and constant change happening along any given river. The Inland Electronic Navigation Chart (IENC) program covers thousands of miles of navigable waterways. Army Corps of Engineers produces charts for America’s inland rivers through the Inland Electronic Navigation Chart program. The National Oceanic and Atmospheric Administration (NOAA) Office of Coast Survey produces charts for coastal and Great Lakes areas, and the U.S. Historically these charts have been printed and distributed on paper, but modern communications systems allow for electronic charts that are able to be updated as new information becomes available.

Nautical charts provide critical information to mariners in support of safe navigation.

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