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By certification 
GFC-180 Azimuth Circle of Magnetic Compass，Azimuth Circle of Compass，is used for CGF-180 reflector magnetic compass and most of the foreign magnetic compasses.
1. aluminum alloy and diamagnetic brass
2. high precision
Marine Azimuth circles GFC-180 adopts fixed mode by using positioning centre hole, the diameter of inner hole is 8mm. The azimuth circle has the advantages of simple structure and convenient operation etc.
