A parallel ruler with brass handles and clear plastic edges, displaying measurement markings in inches and centimeters. The ruler is used for navigation and drawing parallel lines.

Parallel Rules

Accurate chartwork is crucial for safe and efficient navigation. This collection offers a variety of parallel rules designed for precision and ease of use. 

Choose from a range of sizes to suit your charts and the space you have available. A quality parallel rule is an investment you don't have to make often, and is a must-have for students on RYA courses, Merchant Navy deck cadets and those taking OOW and Superyacht chartwork exams.

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