A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
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A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading
A.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel
A.true meridian and the axis of the compass card
B.true meridian and the magnetic meridian
C.magnetic meridian and the axis of the compass card
D.axis of the compass card and the degaussing meridian
A.making a structural change to the vessel
B.a short circuit near the compass
C.belt buckles
D.All of the above
A.accurate only in the Polar regions
B.accurate electronic servomechanisms
C.hand operated
D.accurate only if the vessel is underway
最新試題
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
（）the canal transit，the radar was operating.
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.
Deviation in a compass is caused by the（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
（）20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions are possible.
Compass error is equal to the（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.