This material was written by Robert Berman, W4SET, of Hixon TN for their local county volunteers, in 2015. He does a great job explaining how simplex communications and nets work during a disaster. Hamilton County has a third of a million inhabitants, including the city of Chattanooga. It is mountainous there — which may account for his plans for multiple “area hub” leaders or nets, serving subsets of the entire communications volunteer response. He uses the term “main hub” somewhat like what we would call either our EOC station or the Net Control of the Command Net.
The material in the section on When and How to use a Simplex Net may be the most important training information. It seems to capture the functional aspects well. This report was one of very few written documents I found in a google search for simplex net training for disasters.