Marine Navigation Parallel Ruler with solid arm for durability Benefits Enhances navigational accuracy with clear scale markings for easy chart plotting and route planning. Built to withstand demanding sea voyages thanks to a solid arm construction. Versatile tool for professional captains, maritime instructors, enthusiasts, and maritime students. What it is A Marine Navigation Parallel Ruler designed for standard chart work, enabling precise parallel transfer of lines and courses across nautical charts. Key attributes Function: parallel ruler for chart plotting and course transfer. Compatibility: suitable for use with standard marine charts and plotting practices. Size: compact, handfriendly design suitable for chart tables and training use. Material: solid arm construction for longterm durability. Performance: provides stable, precise parallel movement for reliable navigation. Use scenarios Scenario 1: While planning a coastal voyage, plot course lines and waypoints on the chart, then verify bearings and distances. Scenario 2: In a classroom or training session, demonstrate chart plotting techniques and route planning with students. Scenario 3: Onboard during watch, refine the plotted route in response to weather, traffic, or navigational information.