問題一覧
1
What is the angular difference between true and magnetic meridians for a given location (labeled east or west)
Variation
2
What is the angle between magnetic meridian and the axis of the compass.card
Deviation
3
How does the gyrocompass repeater reproduce the indication of the master gyro compass ?
By accurate electronics servomechanism
4
.
degaussing compensation
5
How does the annual rate of change for magnetic variation shown on a pilot chart?
Gray lines on the uppermost inset chart
6
What is the gyrocompass error introduce by ship's forward motion along it's tracks?
speed error
7
.
It can be compensated using the Flinders bar
8
.
150 PSC
9
.
Subpermanent magnetism
10
What is the magnetism which is present only when the material is under the influence of an external field?
Induced magnetism
11
How do you measure a relative bearing?
Relative to the vessel bow
12
What causes the changes of deviation in a magnetic compass?
Deviation change in a heading
13
What will you apply from a magnetic course to find true course
deviation and variation
14
Which statement about the gyrocompass error is TRUE?
The amount of the error and the sign will generally be the same on all heading
15
How should you adjust a magnetic compass using the fore and aft permanent magnets?
use the magnets in pairs from the bottom up with the trays at the lowest point of travel
16
What would happen if the compass heading and the magnetic heading are the same?
There is no deviation on that heading
17
.
The error is LEAST and the amount of error must be added to the compass to obtain true heading
18
.
It become north seeking by applying forces mechanically or electrically to process the gyroscope
19
What is the error of magnetic compass if it has no deviation?
equal to variation
20
What compass corrector must be checked to ensure they are free of permanent magnetism before magnetic compass is adjusted?
The Flinders bar and quadrantal spheres
21
Which is TRUE regarding deviation?
It is the angle between the magnetic meridian and the axis of the compass card
22
The magnetic effects that causes deviation of a magnetic compass is broken down into what series of component?
It is broken down into coefficient
23
If the magnetic heading is greater than the compass heading, what is the deviation?
Easterly deviation
24
How would you apply the principal purpose of magnetic compass adjustment?
To reduce the deviation as much as possible
25
What is the deflection right or left of the magnetic meridian caused be magnetic properties of the vessel?
Deviation
26
You are steering on course 125° PGC with 1° westerly error. The wind is southwest by south causing 3° leeway. What will be your course made good if the variation is 6°E and the deviation is 2°W?
121 T
27
What is the line indicated on a chart which connect points of equal magnetic declaration?
Isogonic lines
28
Which of the following is the gyrocompass error in which dumping is accompanied by offsetting the point of application of the force from a mercury ballistic?
Tangent latitude error
29
What magnetic compass corrector would you use for correcting both permanent and induced effect of magnetism?
Heeling magnets
30
What is the strength of a reverse field (one of opposite polarity required to reduce the magnetism of the magnet to zero?
Coercivity
31
.
The reading are too low (small numerically) and the amount of the error must be added to the compass to obtain true
32
.
If the red ends are to starboard the athwarships magnet should be lowered
33
.
Come right to close the range then when on the range steer 129°T
34
What is the horizontal angle between the magnetic meridian and the north-south line of the magnetic compass?
Deviation
35
How does the indication of the gyrocompass are sent to a remote repeater?
It is send by transmitter
36
.
The indication is reproduce by the accurate electronics servomechanism
37
What is the process of determining and recording deviation of your ship heading through every 15° of the compass?
Swinging ship
38
Magnetic compass is affected by variation and deviation. Which is NOT true about the magnetic compass?
It is used to find correct North position, which is also the earth rotational axis
39
The compass card has 32 points. How many degrees is the light house observed to be 3 points from the bow on starboard side?
33.75 degress
40
How does the gyroscope best attained the process of producing a free gyroscope into a meridian-seeking gyroscope?
It is best attain by harnessing the Earth's force of gravity
41
What is an error in a gyrocompass caused by rapid changes in course, speed and latitude causing deviation before the gyro can adjust itself?
Steaming error
42
When your error is East. How would you determine your true course or bearing?
Easterly error must be added to obtain true course or bearing
43
You observed that the standard magnetic compass heading differs from the true heading, what do you think is the cause of this difference?
compass error
44
What course you should set the gyro compass when you want to steer NNW?
337.5
45
What is the system of reservoirs and connecting tubes in a gyro compass?
Mercury ballistic
46
The compass has 32 points which is equivalent to 360 degrees. How many points of the compass is the cardinal point south?
16 points
47
What is the angle that a magnetic needle makes with the horizontal plane at any specific location?
Magnetic Dip
48
.
Ballistic deflection error
49
How would you determine the isogonic lines on an isomagnetic chart?
It is indication point of equal variation
50
What is the compass error of a magnetic compass that has no deviation?
Equal to variation
51
What is the difference between compass heading and the true heading?
Compass error
52
.
That your compass has some easterly error
53
Reducing the strength of a magnetic field decreases the number of gauss in the field. What is this process called?
degaussing
54
What is the gyrocompass error resulting from your vessel's movement in OTHER than an east-west direction
speed error
55
It is the total magnetic effects which cause deviation of a vessel's compass, how does this broken down into a series of components?
It broken down into coefficients
56
.How would you center the compass bowl on its binnacle?
You should have the ship on an even keel, heading north or south and adjust the screws until no change of heading by compass is observe if you raise and lower the healing magnet
57
What is the magnetic compass corrector that you can use to correct for both permanent and induced effects of magnetism?
Heeling magnets
58
.
041 PSC
59
.
Westerly error must be substracted to obtain true course or bearing