航海英語GPS、DF及LC的使用單項選擇題每日一練(2019.01.11)

來源：考試資料網(wǎng)

1 Before switching on gyro-compass，you should make sure that the power supply on board is（）.

2 While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.

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3 Deviation which is maximum on intercardinal compass headings may be removed by the（）.

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4 Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.

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5 With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.

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