Somebody woke up on this one.
Cell phone coverage sucks on most of the streams, I use offline maps for navigation on the cell phone with a GPS and maps to figure things out. But, MO rivers change and distances change. I know of 2 rivers within 20 miles that have opened up new / old channels during floods that have cut a mile off of the trip. GPS and Offline maps don't show it, not quick enough on updates, but I can find out where I am based on GPS signal.