The Captain Fields Pattern Parallel Rule is a trusted drafting tool for mariners, students, or anyone who requires precision in plotting courses and setting angles.
How to use a Captain Fields Pattern Parallel Rule Read Guide
A guide to how to use a Portland Speed-Time-Distance Calculator Slide Rule. A traditional yet efficient tool for mariners, aviators, and navigators. It simplifies the calculation of speed, time, or distance based on two known variables.
How to Use a Portland Speed-Time-Distance Calculator Slide Rule: A Step-by-Step Guide Read Guide
