The purveyor of the map tracking software informs me I am unable to trace or track my route directly (automatically) over water. In essence, it's a point to point (straight line) set-up over water. This was not the premise under which I purchased the package. However, it is what it is - I bought it, I’m using it, and it’s too late to go back. I will seek input from other travelers and see if there’s a better “mouse trap” available.

In the meantime, please bear with the routing issue. I found that if you expand the map and you can see the waterways.

UPDATE: I can manually plot the intricate river course which I will do over time. It's easier to do it with a mouse than by using my finger on the iPad.