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The Bi-rola Rule is a rugged plotter that is used by professional navigators because it is quick and easy to use. Patented vertical and horizontal rolling motion simplifies course and plotting calculations.Unique radial arm allows you to automatically include compass corrections in course plotting
Roller body has protractor markings and nautical mile scale
Radial arm has Loran interpolator scales and 200 milimeter rule
When radial arm and body are used jointly, the bi-rola rule becomes a 17 inch (440mm) divider
Speed/time/distance table included
Protective, durable vinyl pouch included
Easy to follow instructions included