A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
您可能感興趣的試卷
你可能感興趣的試題
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
The minimum range at which a target can be detected is basically determined by which of the following?（）.
What will NOT induce errors into a doppler sonar log?（）
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
An electronic depth finder operates on the principle that（）.
Compass error is equal to the（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
A tall object with a light on or near the shore，to act as a guide or warning to mariners is called（）.
（）the canal transit，the radar was operating.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
A barometer showing falling pressure indicates the approach of a（）.