Marine Ruler Parallel Ruler Nautical Charts Parallel Ruler Mapping Points to Pull Parallel Ruler 450MM

Works well enough. While they aren't Weems and Plath quality, they are sturdy enough and made well. My only complaint is that the parallel rulers do not have the cork feet (as found on most other sets), which causes the parallel rulers to slip quite easily on a chart. If you do buy these, be very careful when plotting with them.