This 43.2 cm parallel ruler for marine navigation provides precise chart work with a solid arm designed for durability. It is a professional grade navigation tool suitable for professionals, captains, enthusiasts, and maritime students. It excels in diagram plotting, route planning, and maritime navigation training, and is an indispensable tool for any serious seafarer. The 43.2 cm length ensures stability and accuracy when measuring distances and angles on the chart. Key benefits and features - Precision and stability: enables accurate measurement of distances and angles on nautical charts for reliable plotting and course work. - Professional grade: built with a durable solid arm to withstand regular use by professionals and serious hobbyists. - Versatile use: ideal for diagram plotting, route planning, and maritime navigation training. - Appropriate size and design: 43.2 cm long parallel ruler provides stable control and steady measurements on the chart. Practical use scenarios - Chart plotting during voyage planning: lay out course lines, measure distances to waypoints, and calibrate bearings on the chart. - Route planning: compare alternate routes, assess distances and angles, and refine course selections directly on the nautical chart. - Maritime navigation training: practice chart work, including plotting, distance measurement, and bearing estimation for students and crews.