Definition of compass card in English:

compass card

noun

  • A circular rotating card showing the 32 principal bearings, forming the indicator of a magnetic compass.

    • ‘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.’
    • ‘Thanks to less-than-adequate instrument lighting, I barely could read my BDHI compass card and couldn't see the DME.’
    • ‘The revolving compass card had jammed onto the needle when under pressure, preventing it from swinging freely.’
    • ‘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.’