Features: The Flight Navigation Ruler integrates a built in aviation calculation tool, enabling to determine precise headings while minimizing manual errors during flight planning and execution. Crafted from quality, lightweight plastic, this measuring instrument offer portability without compromising on strength for extended in flight use. Designed for flight students mastering navigation basic and professional requiring tools, it’s equally suited for aviation schools and training programs with its design. Optimized for cockpit operations and flight simulations, this essential aviation calculation tool ensures accurate course adjustments during training or real time navigation tasks. Its multifunctional design combines clear measurement scale with ergonomic handling, streamlining complex flight calculations into a single compact device for precisions. Specifications: Component: plastic Diameter: about. 10cm/3.94in Package Includes: 1pc Plotter Slide Ruler note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.