Description: Comprehensive ToolThis plotter engineering ruler includes 8 scales and is matachable with all VFR aviation charts. It allows for easy conversion between nautical miles and statute miles. Accurate MeasurementsThe tool enables you to accurately measure the heading line, draw the expected flight route, solve the problem of deviating from the course, and determine round-trip bearings. Versatile FunctionalityIt features a sectional side and chart side, a nautical face and statue face. It also allows you to draw north lines and north lines, establishing flight plan checkpoint. Easy-to-Read DesignThe opaque white background makes it easier to read scales. The top/bottom scales of regulations and nautical scales are clearly marked for convenience. Product SpecificationsMade of durable pp material with dimensions of 33.8cmx10.3cm/13.31inchx4.06inch. Each package includes 1 set. Size Chart: 33.8cmx10.3cm/13.31inchx4.06inch Package Includes: 1 Plotter Aviation Slide Rule Note: Please allow slightly errors due to manual measurement and different monitors.