Paper E6B Flight Computer
E6B-P
Made from solid, heavyweight fiberboard, an economical version of the E6B including all its problem-solving features: compute time, speed, distance, altitude, true airspeed, and density altitude problems. Conversions, nautical and statute scales, wind component grid and comprehensive crosswind correction chart included. Includes case and instruction booklet. 9" x 4-1/2". Made in Korea.
Check out this short video on calculating time enroute:
For more details, read the Operating Manual.