I saw one over at the Oakland Museum. But there is also information of swell direction, current strength and other info woven into that chart. I was fascinated, tbh. The actual workings hasn't made it to google, probably because those who know can't work a mouse.Montegriffo wrote:No but I do have a vague memory of seeing it explained on TV once. My guess would be that the beads represent islands and the lines distances. If you know the bearings between islands you can work out where you are by line of sight much like coastal navigation where you can check the bearings of two known landmarks and plot your position using trigonometry.
