Acrylic 300mm Chart Drawing Triangle Ruler Hand-drawn Triangle Board Nautical Navigation Triangle Drafting Marine Accessories Crafted from acrylic, this chart drawing triangle ruler offers performance for navigation and technical drawing tasks.The transparent design ensures clear visibility of charts and drawings, allowing for accurate measurements without obstructing underlying details.Engraved scales provide precise readings, making it suitable for measuring and marking distances on nautical charts.Its triangular shape supports stable hand-drawn plotting, ideal for use in marine navigation environments.Designed for ease of use, the ruler enables efficient single-handed , supporting quick and accurate drafting.Suitable for use on boats, yachts, and ships, it serves as a practical tool for maritime navigation and chart work.The package includes two triangle rulers, each with a maximum measuring distance of approximately 300mm.