You are sending a link to... Why Carry Paper Charts When Boating
This post is an recent interview with Tom Ray, who had an incident on his 42 ft Cruisers Yacht, on May 17, 2015 during a cruise on the Tenn-Tom Waterway. While underway all the electronics at the helm suddenly went dead. The only way to continue navigation was his compass and a paper chartbook.
Duthie Learning now publishes five chartbooks covering all the rivers from Chicago to Cairo, IL and then to the Gulf of Mexico either via the Tenn-Tom Waterway or the Lower Mississippi. Details here.