详细论述了磁偏角自动计算的原理，并提出了一种利用地磁图自动计算图幅磁偏角的新方法。
This paper describes the principle of computing map magnetic declinations, a new method of computing MMD is presented.
机场运行需要跑道上的磁偏角，但本次实际观测数据表明，机场路道上的磁偏角因受机场环境影响，不同地方变化很大，不能反映机场整个区域的实际情况。
According to the specified observation data, it found that the magnetic declinations on airdrome runway varied greatly; therefore, it couldn't reflect the real condition for the airdrome whole area.
机场运行需要跑道上的磁偏角，但本次实际观测数据表明，机场路道上的磁偏角因受机场环境影响，不同地方变化很大，不能反映机场整个区域的实际情况。
According to the specified observation data, it found that the magnetic declinations on airdrome runway varied greatly; therefore, it couldn't reflect the real condition for the airdrome whole area.
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