450mm Marine Parallel Ruler for Navigation Charts Acrylic and Copper Precision Plotting Tool

Product overview This 450mm parallel ruler is engineered for marine navigation and chart work. Built from transparency acrylic with polished copper spacers treated by oxidation polishing, it provides stable alignment and precise measurements for professional navigation tasks. Key benefits Accurate plotting: Transparent acrylic and polished copper spacers allow clear scale visibility and reliable azimuth measurements for millimeterlevel accuracy on charts. Stable and smooth operation: The multifunctional parallel ruler design maintains parallel alignment while allowing flexible movement across the chart, reducing cumulative error during repeated transfers. Durable marine construction: Copperacrylic assembly with oxidation polishing resists wear in demanding marine environments while preserving smooth contact and consistent performance. Professional compatibility: Sized at 450mm for broad chart coverage, suitable for standard nautical charts and common chart table setups. Features and specifications Length: 450 mm, suitable for a wide range of chart scales and onboard navigation tables Materials: transparency acrylic body with polished copper spacers finished by oxidation polishing Function: Parallel ruler for transferring bearings, drawing courses, measuring distances, and aligning scales Precision: Designed for millimeter accuracy required in navigation planning and coastal charting Typical applications Onboard navigation planning: Transfer bearings and plot courses reliably during passage planning and watch handover. Coastal mapping and exercises: Maintain precise bearing lines and measure distances when working on coastal charts or training exercises. Navigation workshops and instruction: Use in educational settings for chart plotting practice where clear scale visibility and repeatable accuracy are essential. Who will find this useful Professional navigators and deck officers needing a reliable plotting tool for voyage planning Marine cartographers and surveyors performing detailed chart work Sailing enthusiasts and navigation students who require a durable, accurate parallel ruler for course calculation and chart exercises Why choose this tool The combination of transparent acrylic for clear chart readability and polished copper spacers for smooth, stable movement delivers a practical, precision plotting aid. Its 450 mm length covers common chart sizes and tasks, making it a dependable instrument for navigation planning, teaching, and detailed charting work.