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The Tengfei 3.4GFC-130 (also known as the GFC-130) is a precision navigation instrument specifically designed for 130mm magnetic compasses, such as the Tengfei CPT-130A, 130B, and 130C series.
While larger azimuth circles like the GFC-190 are used on main navigation compasses, the 130-series is the standard for smaller vessels, fishing boats, and secondary steering stations.
| Feature | Specification |
| Internal Diameter | 165 mm |
| Outer Diameter | 178 mm |
| Material | High-strength Aluminum Alloy (7075) or Non-magnetic Brass |
| Accuracy | < 12′ (Arc minutes) |
| Net Weight | 0.2 kg (Aluminum version) |
| Temperature Range | -30°C to +60°C |
| Sight Line Deviation | < 0.06 mm (Prism box to zero line) |
| Standard | GB/T 335-2005 (Marine Compass Azimuth Circle) |
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