Watch this video to learn how to use the Weems & Plath ROADrule™, a quick reference tool that identifies the most common U.S. aids to navigation, rules of the road, and maneuvering and warning signals for U.S. waters. ROADrule™ takes a large amount of complex information and makes it easy to understand. Whether in a classroom or at the helm, critical decisions can be made quickly and with confidence with the aid of ROADrule™. Its design is similar to a slide-rule.

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