Civilian drones
They are neat. I watched a guy use one and the video feed is decent. Even though Oregon has outlawed them for any hunting use already. They still have a long way to go to be of any significant advantage. Short battery life, limited range, and camera abilities, still make it more of a novelty. I haven't seen one above the river to know what advantage you could get. I'm sure in shallower waters you could gain an advantage.
At my place, which is 60 acres of timber, I wasn't impressed with what I saw. Which by the way was the tops of trees. And if you're not on higher ground it's possible you won't even make it above the trees.
When I was in the Marines, the RQ-11 Raven was first being introduced. These civilian toys don't even come close. Not yet at least...