The NPR-13 Plotter with Rotatable Azimuth Compass Rose is a top of the line plotter. It features four protractor scales and fourteen nautical and statute scales for Sectional, WAC, and Terminal Charts. This plotter will quickly and accurately plot and solve your navigation requirements and problems. Once you use the NPR-13 you-ll be hooked! Instructions are printed on the plotter. Durable plastic. Dimension: 13 5/16-x 4 --