The CRP-5 is manufactured to the exacting standards demanded by commercial pilot training organisations to give a lifetime's performance. Designed particularly for the professional pilot, it includes all necessary functions for the commercial and airline transport pilot examinations. NATO Stock Number - 6605-99-378-4684 Circular slide rule side with clear durable cursor. For calculation and conversion of temperature, time, distance, volume, altitude, speed, weight, fuel, endurance, multiplication and division, 1 in 60 rule, compressibility correction etc. Coloured scales and lettering enhance operation and clarity. Wind triangle side incorporating sliding scale with speed range of 40-1000 and measuring scales on outside edges of 1:500,000 NM, 1:250,000 NM, Inches and mm. Clear rotating disc for lead pencil plotting. For calculation of heading and groundspeed, wind velocity, head and crosswind components etc. The CRP-5W has a wind arm on the wind triangle side to prevent the necessity of plotting with a pencil.