A.variation
B.deviation
C.variation and deviation
D.a correction for the direction of current set
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A.use the magnets one at a time,putting one in one side and then one on the opposite side,one step higher
B.use the magnets in pairs,starting at the top,with trays at the highest point of travel
C.use the magnets in pairs,from the bottom up,with the trays at the lowest point of travel
D.fill all the trays with magnets,then remove them one-by-one until the deviation is removed
A.before correcting for any deviation
B.after correcting for variation
C.after adjusting the fore-and-aft and athwartships permanent magnets
D.before the quadrantal correctors are placed on the compass
A.The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings
B.After the new heading is reached,the vessel should steam on that course for at least two minutes before the adjustment
C.During the course change,you should gently tap the compass to remove any error caused by friction on the pivot bearing
D.After steadying on the new heading,the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error
A.be shielded from direct sunlight
B.be locked into a constant heading
C.have any air bubbles replaced with nitrogen
D.have the compensating magnets removed
A.Compass rose
B.Cursor
C.Plan position indicator
D.Variable range marker
最新試題
Which statement about the Flinders bar of the magnetic compass is CORRECT().
Variation is the angular measurement between().
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is().
Which statement about the gyrocompass is FALSE().
A ship under construction or major repair will acquire permanent magnetism due to()while sitting stationary in the earth’s magnetic field.
When crossing the magnetic equator the().
The line which connects the points of zero magnetic dip is().
Variation in a compass is caused by().
While in drydock your vessel will be belt-gauged.This process involves().
The variation for most given areas undergoes()change,the amount of which is also noted on charts.