Clean Coves (not full of trees) , seeing what banks flow into the water and are not bluffs (deeper edges). Lot of times can see shallows and points that are shallow.
If I say have a strong south wind, I may look to see what marina is closest to coves I think I can fish and stay out of the wind.
I look for other boat launches/ramps that I may not know about. I also sometimes print, mark spots I think look interesting and them take it with me because on the water it looks different and you have a birdseye perspective.
Check out creek arms, etc.
Also I use it for hunting to mark stands, see pinch points, print and laminate and put in truck. Had a entire folder on a 1000 acre lease once.