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
（）20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions are possible.
You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced?（）.
Deviation is the angle between the（）.
A barometer showing falling pressure indicates the approach of a（）.
A Doppler log in the volume reverberation mode indicates（）.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.
The number of pulses of energy transmitted per second is call the（）.
The minimum range at which a target can be detected is basically determined by which of the following?（）.