More lighter, smaller, less prone to break, easy to use one-handed, quicker and do not require electrical power. The wheel on the back of the calculator is used for calculating the effects of wind on cruise flight. The front side of the flight computer is a logarithmic slide rule that performs multiplication and division. CYA E6B includes compute time, speed, distance, altitude, true airspeed, and density altitude problems. It's perfect for flight training. PATNETED IN USA-Made from waterproof plastic material, Built-in scale, more lighter, smaller, less prone to break easy rotating parts.