CPT-130A magnetic compass is a desktop liquid magnetic compass. It is a B-class magnetic compass designed and manufactured in accordance with the national standard GB/T 10104-1995 "General Technical Conditions for Marine B-class Magnetic Compass". It has a simple structure, complete functions, convenient calibration, accurate pointing, stable and reliable, and is suitable for use as a rudder compass in large and medium-sized sail fishing boats and small steel ships.