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Not sure if this will make sense to you..or anybody else, I don't drop brush piles but I guess locating bottom cover that you have found and wish to return to would be the same kinda thing, what I do is make a note of the depth if the cover in located on a changing depth and try and locate a couple of land marks that line up with each other to get you in the right location and the depth to find the cover... If the bottom is a constant depth then I try to find two landmarks that line up and another two landmarks 90 degrees from the first two, if you are a long piece from the shoreline it is tough to locate land marks... This works for me but not sure I explained it so anybody can understand it.