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ROADrule™ IALA identifies the International Association of Lighthouse Authorities Maritime Buoyage System for Regions A and B, including all types of fixed and floating marks. Whether in a classroom or at the helm, critical decisions can be made quickly and with confidence with the aid of ROADrule™ IALA. Identifies International Association of Lighthouse Authorities Maritime Buoyage System for Regions A & B20 Light characteristicsManeuvering & warning signals12 Rules of the Road40 Navigation Aid DefinitionsMagnifying lens for clear readability of definitionsDurable plastic construction