A.Relative
B.TRUE
C.Compass
D.Magnetic
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A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
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
最新試題
（）is on the panel of radar.
How is variation indicated on a small-scale nautical chart?（）.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
What will NOT induce errors into a doppler sonar log?（）
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
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?（）.
A Doppler speed log indicates speed over ground（）.
A tall object with a light on or near the shore，to act as a guide or warning to mariners is called（）.