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Made with the professional in mind, the Bi-Rola Rule has a considerably larger body than the smaller bi-rola rule. Built to take rigorous use aboard commercial and blue water vessels, the P.R. 500 provides one of the easiest methods invented for plotting courses.

Features:

• Patented four-way rolling motion
• Roller body has protractor markings every 1/2 degree
• 1-1/4" magnifying lens for enhancing chart data
• Easy to follow instructions
• Packaged in a protective, durable vinyl pouch

Dimensions:

• Length: 19-5/8"
• Width: 3-5/8"
• Thickness: 1-1/4"
• Weight: 1 lb. 10 oz