Magnetic Compass Flashcards
To find a magnetic compass course from a true course you must apply ________________________.
Select one:
a.
Variation
b.
Deviation and variation
c.
Deviation
d. Magnetic anomalies (local disturbances)
b.
Deviation and variation
As a vessel changes course to starboard, the compass card in a magnetic compass ____________.
Select one:
a.
also turns to starboard
b.
remains aligned with compass north
c.
turns counterclockwise to port
d.
first turns to starboard then counterclockwise to port
b.
remains aligned with compass north
Deviation is not constant; it is different with every change in…
Select one:
a.
Cargo
b.
Vessel heading
c.
Speed
d.
Geographic location
b.
Vessel heading
Variation is not constant; it is different with every change in __________.
Select one:
a.
speed
b.
cargo
c.
geographic location
d.
vessel heading
c.
geographic location
The most important feature of the material used for making the binnacle of a standard magnetic compass is that it is__________.
Select one:
a.
weatherproof
b.
capable of being permanently affixed to the vessel
c.
nonmagnetic
d.
corrosion resistant
c.
nonmagnetic
Magnetic heading differs from compass heading by ________________.
Select one:
a.
True Heading
b.
Deviation
c.
Compass error
d.
Variation
b.
Deviation
In applying variation to a true course to obtain a magnetic course ___________________.
Select one:
a.
you should subtract east and add west
b.
you should add east and add west
c.
you should subtract east and subtract west
d.
you should add north and subtract south
a.
you should subtract east and add west
Compass error is equal to the ___________________.
Select one:
a.
difference between true and magnetic compass
b.
total effect of variation and deviation taken together
c.
deviation minus variation
d.
variation plus compass course
b.
total effect of variation and deviation taken together
If the compass heading and the magnetic heading are the same, then __________________.
Select one:
a.
the deviation has been offset by the variation
b.
There is no deviation on that heading
c.
the compass is being influenced by nearby metals
d.
there is something wrong with the compass
b.
There is no deviation on that heading
If a magnetic compass is not affected by any magnetic field other than the earth’s, which statement is true?
Select one:
a.
Compass north will be true north
b.
Compass error and variation are equal
c.
There will be no compass error
d.
Variation will equal deviation
b.
Compass error and variation are equal
If the magnetic heading is greater than the compass heading, the deviation is __________________.
Select one:
a.
North
b.
South
c.
East
d.
West
c.
East
Deviation is caused by ____________________.
Select one:
a.
Nearby magnetic land masses or mineral deposits
b.
Changes in the earth’s magnetic field
c.
The magnetic lines of force not coinciding with the lines of longitude
d.
Magnetic influence inherent to that particular vessel
d.
Magnetic influence inherent to that particular vessel
The difference in degrees between true north and magnetic north is called ____________________.
Select one:
a.
Drift
b.
Deviation
c.
Variation
d.
PSC
c.
Variation
In going from magnetic to true, you must _______________________.
Select one:
a.
add easterly variation or subtract westerly variation
b.
subtract westerly variation or add easterly compass error
c.
subtract deviation and add variation
d.
multiply the easterly deviation by the westerly variation
a.
add easterly variation or subtract westerly variation
The lubber’s line on a magnetic compass indicates__________.
Select one:
a.
magnetic north
b.
compass north
c.
a relative bearing taken with an azimuth circle
d.
the direction in which the boat’s bow is heading.
d.
the direction in which the boat’s bow is heading.
