Bi-Rola Rule

SKU: WP-155

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Price: $116.99

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  • Patented vertical and horizontal rolling motion simplifies course and plotting calculations.
  • Unique radial arm allows you to automatically include compass corrections in course plotting.
  • Patented four-way rolling motion.
  • Roller body has protractor markings and nautical mile scale.
  • Radial arm has Loran interpolator scales and 200 mm rule.
  • Automatic compass corrections.
  • When radial arm and body are used jointly, bi-role rule becomes 17" (440 mm) divider (approximately).
  • Speed/time/distance table included.
  • Easy to follow directions.
  • Protective, durable vinyl pouch.
  • Dims: 13 7/8" x 2 5/8" x 1" (352 x 67 x 25 mm).
  • Weight .75 lbs. (340 g).


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