A.damping error
B.ballistic deflection
C.quadrantal error
D.speed error
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A.needles are nearly in line with the meridian
B.vessel is near the magnetic poles
C.variation is near zero
D.vessel is near the magnetic equator
A.induced magnetism in vertical soft iron
B.induced magnetism in horizontal soft iron
C.permanent magnetism in ship's steel
D.vessel's inclination from the vertical
A.variation
B.deviation
C.compass error
D.bearing error
A.increases with latitude，being maximum at the geographic poles
B.decreases with latitude，being maximum at the geographic equator
C.is greatest when a vessel is near the Earth's magnetic equator
D.remains the same at all latitudes
A.variation
B.deviation
C.compass error
D.drift
最新試題
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
When relieving the helm，the new helmsman should know the（）.
What is the basic principle of the magnetic compass?（）
What is the name of the movable，radial guide line used to measure direction on a radar?（）
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
The line which connects the points of zero magnetic dip is（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
When crossing the magnetic equator the（）.
The quadrantal spheres are used to（）.
What is an advantage of the magnetic compass aboard vessels?（）