The Weems Parallel Plotter is their most popular and easy to use rolling plotter.
It is mounted on a roller that allows you to plot courses and parallel lines with simple direct transfer. This means that it does not need the space that traditional parallel rules or triangles do.
Two rollers keep the plotter parallel as you slide it across the chart. Contains distance scales of 1:20,000, 1:40,000 and 1:80,000 to fit N.O.S Coast and Harbor Charts, as well as an inch scale.
Includes semi-circular protractor for measuring courses and bearing against meridian on a chart. Its also has two quarter circle protractors for measuring courses and baring against parallel of latitude.
Used for measuring or laying off courses and distances on a nautical chart.
Instructions included. Weems and Plath lifetime warranty.