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
An ECDIS is required to display which information?（）
A deadhead is a(n)（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
Compass deviation is caused by（）.
（）is on the panel of radar.
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 range to a small，charted object such as a light will provide a line of position in which form?（）.
An electronic depth finder operates on the principle that（）.
（）20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions are possible.