單項選擇題

Variation in a compass is caused by（）.

A.worn gears in the compass housing
B.magnetism from the earth's magnetic field
C.magnetism within the vessel
D.lack of oil in the compass bearings

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單項選擇題

True heading differs from magnetic heading by（）.

A.deviation
B.variation
C.compass error
D.northerly error

單項選擇題

To center a compass bowl in its binnacle，you should have the ship on an even keel，heading north or south，and adjust the screws until（）.

A.the compass heading is in line with the lubber's line
B.there is no lost motion in the gimbal rings
C.no change of heading by compass is observed if you raise and lower the heeling magnet
D.the gimbal rings do not strike the compass frame when they are tilted

Variation in a compass is caused by（）.

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True heading differs from magnetic heading by（）.

To center a compass bowl in its binnacle，you should have the ship on an even keel，heading north or south，and adjust the screws until（）.

To center a compass bowl in its binnacle，you should have the ship on an even keel，heading north or south，and adjust the screws until（）.