A.Flinders bar
B.transverse magnets
C.fore-and-aft magnets
D.soft iron spheres on the sides of the compass
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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.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel
A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading
A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
A.fore-and-aft and athwartships magnets
B.dip needle and heeling magnet
C.heeling magnet and Flinders bar
D.Flinders bar and quadrantal spheres
最新試題
（）is a digitized“picture”of a chart.
In using Loran-C，skywave reception gives greater range but is（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
Would you mind（）your DF?
The line connecting the Loran-C master station with a secondary station is called the（）.
Which of the following statements is TRUE regarding crane operations（）.
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
What does not contribute to the commercial GPS receiver position error（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
（）is not a component of GPS.