Using a pole/anchor to wind line like the old "endless" clotheslines. I think it would only work on tidal flats where the low tide recedes to reveal sea floor, which would allow you to set the "anchoring pulley". Good Idea, but I can't see its practical use for "normal" tidal coast lines where the tide doesn't recede far enough out to set such a device. I might be wrong but thats my 2 cents worth.