Parallel Rules


Of all Weems and Plath traditional parallel rulers, the 15 inch Brushed Aluminum Arm Parallel Ruler is the best seller. This sturdy acrylic parallel ruler is easy to use and is a necessary tool for every seagoing navigator. They are used in the chart navigation module to find latitude and longitude and transfer compass courses on the chart.

  • Brushed aluminum arms
  • Polished aluminum handles
  • Milled with bevelled edges
  • Includes protractor scale