A.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel
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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
A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts
A.radar
B.DF
C.Satellite Navigator
D.Automatic Omega Navigator
最新試題
A radar display in which North is always at the top of the screen is a(n)（）.
Compass deviation is caused by（）.
Deviation is the angle between the（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
An ECDIS is required to display which information?（）
How is variation indicated on a small-scale nautical chart?（）.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?（）.
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.