For professionals, captains, enthusiasts, and maritime students seeking a reliable navigational instrument for training and real world use. Benefits - Enables precise diagram plotting, route planning, and maritime navigation training on standard chart tables - Durable construction with a solid arm for lasting stability during use - Maintains alignment for accurate and repeatable measurements of distances and angles Key features - 17 inch parallel ruler for ample working space on nautical charts - Parallel ruler design keeps edges aligned for consistent chart work - Solid arm provides durability and stability during plotting What it solves - Reduces uncertainty in chart plotting and course planning - Improves speed and accuracy when measuring distances and bearings on charts - Supports ongoing training and practice for serious mariners Specifications and compatibility - Size: 17 inches - Suitable for standard nautical charts used on chart tables - Built for repeated use in professional or academic navigation settings Use scenarios - Pre-voyage planning: plot courses, measure distances, and determine bearings for safe routing - Navigation training: practice diagram plotting and route planning in classroom or simulator environments - Hobbyist chart work: develop coastal or offshore plans with reliable, repeatable measurements This tool is designed for serious mariners seeking a stable, accurate, and durable parallel ruler for chart work and navigation training.