CMAP MAX Electronic Charts: Bring your electronic charts to life with MAX, the ultimate navigator, and make cruising, sailing and fishing easier, safer and more fun. You’ll benefit from the most accurate chart detail, versatile features and a wealth of important data. C-MAP MAX NA-M023 - U.S. Gulf Coast & Inland Rivers - C-Card Coverage: Coverage of the Gulf states, starting from Boca Raton, FL, down to Key West, FL, then back up and around the Gulf to Brownsville, TX. Also includes coverage of all the Great Lakes: Erie, Superior, Ontario, Huron and Michigan. Coverage of the Great Lakes also includes Fox River and Lake Winnebago, Lake St. Clair and the Trent-Severn Waterway. River coverage includes the Mississippi River, Ohio River, Illinois River, Arkansas River, Red River, Ouachita River, Tennessee River, Cumberland River, Tenn-Tom Waterway and the Black Warrior River. Other smaller rivers are also included: Green River, KY, Kanawha River, WV, Allegheny and Monongahela Rivers, PA and Kankakee River, IL. Additional coverage of the Hudson River, including Lake Champlain, down to New York City, the Erie Barge Canal and partial coverage of the St. Lawrence River up to Montreal. More Features and Specifications