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Weems & Plath Bi-rola Rule Rolling Plotter

Item #: 
Weems & Plath
Model #: 
Shipping Weight: 
0.55 Lbs.
List Price: 
Status:    In Stock



The original Weems & Plath bi-rola™ Rule Rolling Plotter - its patented vertical and horizontal rolling motion simplifies course and plotting calculations, while the unique radial arm allows you to automatically include compass corrections in your course plotting.


  • Patented four-way rolling motion
  • Roller body has protractor markings and a nautical mile scale
  • Radial arm has Loran interpolator scales and 200 millimeter rule
  • Automatic compass corrections
  • When radial arm and body are used jointly, the Bi-Rola rule becomes a 17" (440 mm)divider (approximately)
  • A speed/time/distance table is included
  • Easy to follow instructions
  • Packaged in a protective, durable, vinyl pouch


  • Length: 13-7/8"
  • Width: 2-5/8"
  • Thickness: 1"
  • Weight: 12 oz.


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