Premier Enroute IFR Radio Facility Chart Plotter - Lifetime Guaranteed by APR Designed with user-friendly color graphics. Accurately configured precision scales are easy to find. Parallel lines helps you to quickly read and plot meridian courses. Available scales are as follows: One inch = 5, 7, 7.5, 8, 10, 12, 14, 5, 16, 20, 23, and 31.