Classification And Inspection Method Of Marine Magnetic Compass.

First, Marine magnetic compass classification
1, according to the use and installation position:
1) Standard compass: open top deck, ship magnetic influence is small, good vision.
Use an refraction system or projection device to place dials and baselines
Reflected into the bridge for steering.
2) Steering compass: steering wheel in front, steering.
3) Emergency compass: Before emergency aft (Taiping) rudder, supply emergency rudder.
4) Boat compass: on the lifeboat, small; Oil lamp, lamp oil reserves 10 hours.

2, according to the compass diameter classification:
Available in 190 mm, 165 mm and 130 mm.

3, according to the liquid classification: 1) liquid compass; 2) Dry compass

Second, check the sensitivity of the Marine magnetic compass: check by measuring the stagnation Angle. Check methods are as follows:
1, conditions: the ship is fixed at the dock, the ship shore machinery does not work and the deviation is not large;
2, accurately record the course value;
3. Use a small magnet or iron to deflect the compass 20-30 to the left (right) and quickly remove it;
4. After the compass is restored to balance, the difference between the heading reading and the original heading value should be less than 0.20;
5. Do the same check in the right (left) direction.