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. This simple to use navigation aid shows the actual view of maritime buoyage systems with corresponding chart symbols. It takes a large amount of complex information and makes it easy to understand and quick to refer to with a design that is similar to a slide-rule. 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 & B- Displays 20 light characteristics- Displays maneuvering & warning signals- Displays 12 Rules of the Road- Displays 40 Navigation Aid Definitions- Magnifying lens for clear readability of definitions- Durable plastic construction- Lifetime warranty