| 摘要 |
A magnetic compass comprising arrangement to displace the steering marker to create coefficient A equal to the sum of the variation and deviation effecting the compass to counteract the compass error, thereby indicating the true course. Repeaters fed from this compass which repeaters are fed by the hunting between the compass card and the displaceable steering marker, resulting in repeaters that indicate the true course as well as true bearings. The control effecting the displacement of the steering marker from a computer programme which displaces the steering marker in dependence upon the effecting variation and deviation, thus the magnetic compass shows true course and the repeaters true course and true bearings automatically.
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