Well  shipping Angus, so you know when the dredgers go on er er er creeping ahead, see we used to have er what we call the head wire there used to be a wire which was all stretched out say about half a mile and what you s and erm and all according what erm how much mud you were dredging for the depth of water and then my father would give the signal to say right, cos on the, on the head wire used to have a pull, we call the pulls and they were like er a jutted piece off the wheel and he'd say five pulls ahead and we'd say one two three four five right and we went ahead with it and then when we were dredging sidewards you see, used to  sidewards, you never went ahead with it, not all the time you c you  went sidewards across the river, and erm once you got  ahead your side chains they  moving up cos you got so far ahead th that the side chains weren't much good to you, so you had to then move your side chains so you got a little off the mud in an old boat and then re  further up the river.