Determine
and Allow for Compass Errors
( Menghitung
dan menggunakan kesalahan kompas )
1. The annual change in
variation for an area can be found in the
center of the compass rose on a chart of the area
2. 
What is an advantage of the
magnetic compass aboard vessels?
It is reliable due to it's
essential simplicity.
3. Variation is the angular
measurement between magnetic meridian and the geographic meridian
4. Variation is a compass error that you cannot
correct
5. Variation is not constant; it is different with every change in geographical
location
6. If the gyrocompass error is
east, what describes the error and the correction to be made to gyrocompass
headings to obtain true headings?
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The readings are too low (small numerically) and the amount of the error must be
added to the |
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compass to obtain true |
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7. On a nautical chart, the
inner ring of a compass rose
indicates magnetic directions
8. The greatest directive force
is exerted on the magnetic compass when the vessel
is near the magnetic equator
9. When adjusting a magnetic
compass using the fore-and-aft permanent
magnets, you should use
the magnets in pairs, starting at
the top, with trays at the highest point of
travel
10. 
As a vessel changes course to
starboard, the compass card in a magnetic compass remains
aligned with compass north
11. How is the annual rate of
change for magnetic variation shown on a pilot chart?
Gray lines on the uppermost
inset chart
12. The purpose of the soft iron
spheres mounted on arms on the binnacle is to compensate for induced
magnetism in the horizontal soft iron
13. 
Which statement about the
gyrocompass is FALSE?
Its accuracy remains the same
at all latitudes.
14. 
Which information does the
outer ring of a compass rose on a nautical chart provide?
True directions
15. You would find the variation
on a polyconic projection chart on the compass
rose
16. You are using a radar in which your own ship is shown at the center, and the heading flash always points to 0Degree. If bearings are measured in relation to the flash, what type of bearings are produced? Relative
17. If the compass heading and
the magnetic heading are the same then there
is no deviation on that heading
18. The total magnetic effects which cause deviation of a vessel's compass can be broken down into a series of components which are referred to as coefficients
19. Deviation which is maximum on
intercardinal compass headings may be removed by the soft
iron spheres on the sides of the compass
20. The Flinders bar on a
magnetic compass compensates for the induced
magnetism in vertical soft iron
21. The gyrocompass error
resulting from your vessel's movement in OTHER than an east-west direction is
called
speed error
22. When changing from a compass
course to a true course you should apply
variation
and deviation
23. The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is deviation
24. Indications of the master
gyrocompass are sent to remote repeaters by the transmitter
25. 
Which compensates for errors
introduced when the vessel heels over?
A single vertical magnet
beneath the compass
26. A single vertical magnet
placed underneath the compass in the binnacle is used to compensate for induced magnetism in the vertical soft iron
27. The standard magnetic compass
heading differs from the true heading by compass
error
28. Deviation in a compass is
caused by the influence
of the magnetic materials of the vessel
29. The lubber's line on a
magnetic compass indicates the
direction of the vessel's head
30. Heeling error is defined as
the change of deviation for a heel of
1⁰ While the vessel is on a
compass heading of 000⁰
31. Deviation changes with a change in Heading
32. Magnetic variation changes with a change in The vessel's position
33. At the master gyrocompass, the compass card is attached to the Sensitive element
34. Which compensates for induced
magnetism in the horizontal soft iron of a vessel?
Iron spheres mounted on the
binnacle
35. A relative bearing is always measured from The vessel's head
36. The magnetic compass magnets are acted on by the horizontal component of the Earth's total magnetic force. This magnetic force is GREATEST at the Magnetic equator
37. How is variation indicated on
a small-scale nautical chart? Isogonic lines
38. Gyrocompass repeaters
reproduce the indications of the master gyrocompass. They are_
Accurate electronic servomechanisms
39. What is the basic principle
of the magnetic compass?
Magnetic materials of the same polarity repel each other and those of
opposite polarity attract
40. If a ship is proceeding towards the magnetic equator, the uncorrected deviation due to permanent magnetism Decreases
41. When adjusting a magnetic compass for error, a deviation table should be made After adjusting the fore-and-aft and athwartships permanent magnets
42. A system of reservoirs and connecting tubes in a gyro compass is called a Mercury ballistic
43. What are the only magnetic
compass correctors that correct for both permanent and induced effects of
magnetism?
Heeling magnets
44. If a magnetic compass is not
affected by any magnetic field other than the Earth's, which statement is
TRUE?
Compass error and variation
are equal.
45. To center a compass bowl in
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 observed if you raise and lower the heeling magnet
46. Compass error is equal to the Combined variation and deviation
47. Magnetic compass deviation is the angular difference between magnetic north and compass north
48. You are proceeding up a channel at night. It is marked by a range which bears 185Degree T. You steady up on a compass course of 180Degree with the range in line dead ahead. This indicates that you(r)
Compass has some easterly
error
49. The compass rose on a
nautical chart indicates both variation and
Annual rate of variation
change
50. The quadrantal spheres are
used to 
Remove deviation on the intercardinal headings
51. The principal purpose of
magnetic compass adjustment is to
Reduce the deviation as much as possible
52. 
At the magnetic equator there
is no induced magnetism in the vertical soft iron because
There is no vertical component
of the Earth's magnetic field
53. The vertical component of the
Earth's magnetic field causes induced magnetism in vertical soft iron. This
changes with latitude. What corrects for this coefficient of the deviation?
The Flinders bar
54. The directive force of a
gyrocompass
Decreases with latitude, being maximum at the geographic equator
55. Lines on a chart which
connect points of equal magnetic variation are called 
isogonic
lines
56. Deviation is the angle
between the
Magnetic meridian and the axis
of the compass card
57. You are about to go to sea
and adjust the magnetic compass. To expedite the adjustment at sea, in what
order should the following dockside adjustments be made?
Flinders bar first, then the spheres and heeling magnet
58. Which error is NOT included
in the term ""current"" when used in relation to a fix?
Known compass error
59. When crossing the magnetic
equator the
Heeling magnet should be inverted