Like the others said keep your eyes on the graph and a marker bouy handy to toss.
One of the things I've noticed while working bush piles is that a lot of times I will see that the pile is in line with a fallen tree on shore or is inline with the edge of a ramp or dock edge or a couple of prominent rocks or any two outsatnding features. These are the things folks used before GPS's when planting brush.
I know it is a lot of work to fix and plant brush piles but I think this board out to be discourging the idea of ownership of any brush pile planted in public water that is not to be used by others is rather outlandish. Once that brush leaves the boat its public and first come first served.
One shouldn't be putting themselves at risk while fishing but if one is harmed or threated by others hopefully they will quickly retreat but for sure they should report the incident.
“There is no difference between communism and socialism, except in the means of achieving the same ultimate end: communism proposes to enslave men by force, socialism—by vote. It is merely the difference between murder and suicide.” Ayn Rand