Alternative
 

Another less cluttery method is to have no jacklines, and clip a tether to different fixed attachment points as you go. It is actually not too difficult to have two tethers, travel to the end of one, clip the second one in ahead of you, then unclip the one behind. I have all sorts of handy favorite clipping spots all over the boat, suitable for different tasks, but mostly near the centerline. If your tether is rigged like a rockclimber's "Daisy chain", you can effortlessly shorten or lengthen at will, and even wrap it around objects bigger than the clip will accomodate and clip it back to itself. Most handy.