Coastal Explorer definitely has the inland river charts, and buoy and light info.
From the main screen, click on the “gear wheel” icon on the left side (last icon at the bottom). From the list of options that pops up, scroll down to “Charts and Add Ons” and click that option. From the next screen click on the BLUE item that says “Store” (right under the heading Charts and Add Ons.
Scroll down to the third option “US Army Corps of Engineers” - click on that, and you can then select the buoys/marks or the river charts you want - for example Upper Mississippi or Lower Mississippi.
You must have an internet connection to download those charts.
Once you have the river charts/buoys charts you want - Coastal Explorer will periodically check for new charts and offer to download new ones for you.
They’ve done a short video about this.