I publish these mostly because I hate losing my charts to an accidental "k" for kellogg's computer screw up. The arcs were made circular with the projection tool. If you make it mine you may have to check with the projection tool on the fib circle to make sure it held it's arc. The scale set doesn't hold a scale LOCK properly. There's a huge arc that goes around right from the bottom to join the smaller arcs. As long as nobody screws with this it should be correct.