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
The number of pulses of energy transmitted per second is call the（）.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
A Doppler speed log indicates speed over ground（）.
A radar display in which North is always at the top of the screen is a(n)（）.
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?（）.
Error may be introduced into a magnetic compass by（）.
What will NOT induce errors into a doppler sonar log?（）
Compass error is equal to the（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.