I just traveled ICW. The best $20 were spent on "Managing the Waterway" by Mark and Diana Doyle. I didn't have internet- my laptop died. I didn't have mapping GPS, I had only basic GPS. My friend lended me 1983 edition of charts.
I traveled almost entire lengthof ICW, from Steward FL, to Norfolk VA using this book and outdated charts. All info you really need is there. Bridges, Anchorages, Marinas, alternative waterways, everything. It's much better than Dozier's Waterway Guide.
And welcome to Sailnet