Is there a card for rivers? like the Black river and Pee dee river?
None that I’m aware of, although I have a Lowrance MapCreate program that allows me to make my own, topo only, no depths or anything.
Garmin units may allow use of maps made with their Mapsource or Base Camp software, but I’m not sure.
In the coastal rivers where there are channel markers, my Navionics cards will show depths and nav aids, though.
Blackwaterkatz