It's not intended for road navigation at all, although I will be adding more land labels for major roads and major geographic features. For on the water navigation, that's not it's primary purpose, and I need to add a navigation disclaimer, but with the PDF Maps app you can see your location and heading so in general yes. But I imagine it more as a general interest reference to the lake bathymetry, one that lets the boater see the lake as it is under them in the water. It's also great for fishing, bottom depth and structure play a huge toile in fishing and while depth finders are very helpful, they only show what's immediately under you.
The darker green in some areas (most over Nevada side) are the National Forests. I may need increase labeling.
I had an unusual issue with labeling here. The map looks like it needs larger labels but I designed it with smaller labels assuming most users would actually be zoomed in pretty far as they used the map while under way. I don't want labels obstructing the small details of the bottom or the shore where there is very detailed lifework for piers and jetty etc.