This indestructible, lifetime IFR plotter conveniently measures mileage and courses on any FAA Low Altitude En Route Chart. Includes eight individual mileage scales and a compass rose. The holding diagram can be overlaid on your chart to easily and accurately determine holding entries in seconds. Just turn it over for left-hand turns. Includes complete instructions. At only 8" long, it can slide into a shirt pocket and is a necessity for any instrument pilot. Won’t warp or break. Carries our lifetime guarantee. Acceptable for use during FAA written exams.