Feature:1. Description of Function: The parallel ruler is used for drawing azimuth lines or navigation lines and measuring azimuth line degrees or heading line degrees when chart operations are carried out.2. High Transparency: Our navigation parallel ruler has high transparency, clear scale and accurate measurement, so that you can have a nice experience of using it.3. Copper and Acrylic Material: Our parallel ruler is made of copper and acrylic material, the pure copper spacer is polished, not easy to oxidize and with stable face.4. Flexible Operation: This navigation parallel ruler is very easy and flexible to operate, just follow the actual needs and routine operation.5. Exquisite Craftsmanship: This marine navigation parallel ruler is light in weight, easy to carry, and exquisite craftsmanship, so you can achieve stable use.Specification:Item Type: Parallel RulerMaterial: Copper, acrylic.Package List:1 x Marine Navigation Parallel Ruler