RNP-2 Chart Plotter for fast, combined readings of headings and distances. Pocket size. The unique and simple RNP-2 Plotter is designed for use on topographical charts. By simply aligning the top edge over the proposed track, Magnetic or True headings (zero wind) and distances are simultaneously obtained. The RNP-2 also incorporates scales for 1:1,000,000 to 100 nm and 1:500,000 to 25 nm.