Description
The Weems & Plath 18-inch (457mm) Aluminum Arms Parallel Rule feature aluminum arms that join two clear acrylic rulers inscribed with a protractor scale. An essential item in any proper navigation kit, these rules are used to plot direction on a nautical chart from any convenient meridian or compass rose. The two straight-edged rules are connected to maintain the same angle. By walking the rules across the chart and securely holding down the non-moving rule, you can effectively plot a course.
Features
- 18-inches (45.72cm) long
- Protractor scale
- Sturdy clear acrylic with aluminum arms
- Protective plastic sleeve
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