Feature: 1. The structure three-bar locator consists of a copper dial (180° left and right), three benchmarks (central fixed rod and left and right moving rod), micro-moving drum and index, center needle and worm gear screw rod. 2. It is suitable for three-mark two-corner positioning on the chart. 3. An instrument is used to determine the position of a ship and ensure its safe passage. 4. A great tool for the people to locate their position on the chart. 5. Professional manufacturing, stable performace, high reliability. Specification: Condition: 100% Brand New Item Type: Marine Dividing Machine Color: As the Picture Shows Model: TS-630 Main Technical Performance: (1) Dial Diameter: Approx. 126.85mm/4.9in (2) Minimum Reading: 1 Minute of Arc (3) Benchmarking Length: Approx. 630mm/24.8in Application: Three-Mark Two-Corner Positioning on the Chart Package List: 1 x 3-Arm Protractor2 x Instruction Manual 3 x Benchmarking 1 x Micro-Motion Drum 1 x Brush1 x Wrench1 x Spring 1 x Needle 3 x Screw