A circular rotating card showing the 32 principal bearings, forming the indicator of a magnetic compass.
- Compass makers compensate for dip error by intentionally unbalancing the compass card / magnet assembly to the degree needed to provide optimum accuracy in a range of latitudes.
- Thanks to less-than-adequate instrument lighting, I barely could read my BDHI compass card and couldn't see the DME.
- It can be used to determine if DC current is flowing in a circuit by moving it up against one of the two wires in a circuit and watching for a movement of the compass card.
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