Mental math for aviators. Easily compute angles, distance and time, wind components and drift angles, maximum wind effect. Visualize the actual wind on your HSI, get the right bank angles and turn radius calculations in a matter of seconds without using anything but brain power. Find the max range of a VHF station just by counting on your fingers, and more.. M3 is a book that gives back the power of mental math to aviators from all backgrounds, using simple tools and rules of thumb to avoid diverting attention while flying, thus enhancing situation awareness, promoting safe and efficient flying. Various examples are provided in the different sections to consolidate the comprehension at each level. Aviators will find here tried and tested rules of thumb as well as some innovative approaches to common situations encountered when airborne, while keeping the mental calculations to their simplest form. Soon you'll be ready to ditch the calculator