A.persistence
B.pulse repetition rate
C.pulse length
D.resolution
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A.Relative
B.TRUE
C.Compass
D.Magnetic
A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
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
最新試題
A Doppler speed log indicates speed over ground（）.
An ECDIS is required to display which information?（）
A Doppler log in the bottom return mode indicates the（）.
Compass error is equal to the（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
Compass deviation is caused by（）.
Error may be introduced into a magnetic compass by（）.
The minimum range at which a target can be detected is basically determined by which of the following?（）.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.