It’s good to have a watershed layout to reference when creating the model schematic. VO has the ability to add a picture in the background of the Schematic view. A picture is provided for this exercise in the training package.
To set the background, right-click on the Schematic view > Background > Change Background… In the pop-up window, navigate to and open the background image “…data\Map.png”.
Practice moving the background by holding mouse middle wheel. Try zooming in and out by scrolling the wheel.