....Bring solid glass to expand your view. Watch where birds are going and listen for gun shots.....
Aka "Boom scouting". Late one Saturday morning while hunting Snipe around holes in a mud flat on a what had always been a poor duck hunting area I watched not one, not two, but three duck boats poling and pushing through the shallow timber to get to where I was Snipe hunting that morning. It was a great morning for Snipe hunting with lots of shooting on my part. I know for sure the closest boat watched me with binoculars for several minutes before working their way back to the main lake. I bet that place was packed with duck hunters the next weekend.
There is a great open shallow hole from what was once a giant beaver pond in the woods off the Bob that I sometimes hunt in high water years. It is overlooked by other hunters because you have to walk away from the lake to get to it and there is just enough brush in around it that it don't show up well on google earth. I never ever hunt it on weekend days due to boom scouters on that lake. Boom scouting I suppose can be utilized in a way that does not effect the hunters already there, but more often than not those that rely on boom scouting are more like competition hunters that will either make a plan to beat you to the hole the next morning or weekend, build a blind on it after you leave to claim it as their own, or worse set up just down wind of you.