The boat issue vs wadenwalker is going to come up forever, I do a lot of drifting and sometimes you just don't see the guys on shore. If dude is crouching in tall grass wearing fishing gear waiting for fish to rise it's not often easy to spot them and I think this is where a lot of issues come from, I don't have a solution just noted.
I was drifting with Copperjonnie and Uberfly this season, we pulled in about 15m above a seam, got out and we just preparing to fish. My boat was totally visable and i would be able to tell we were fishing this seam, but another guide swings in his boat over the seam and proceeds to fish it with his clients... I was a rod's distance away. I was going to knock him out j/k at the launch but after fishing right behind his weak ass skillz and hooking up 4 fish I figured he earned his karma. I do remember who he is.....