WorksheetsMagnetic Compass Quiz
Total questions: 30
Worksheet time: 15mins
What is the main cause of induced magnetism in a ship?
The Earth's magnetic field
Structural changes in the ship
Magnetic cargo
Shipboard electronic equipment
Which magnetic corrector is located in an external tube and compensates for vertical soft iron effects?
Flinders bar
Heeling magnet
Fore-and-aft B magnet
Athwartship C magnet
What does the term "degaussing" refer to in maritime navigation?
Neutralizing shipboard magnetic effects
Adjusting the compass deviation
Correcting gyro errors
Aligning compass bearings with true headings
What should be done after completing compass adjustments on a vessel?
Energize degaussing coils and repeat the swing.
Record deviations at intercardinal points only.
Ensure deviation is eliminated entirely.
Remove all magnetic correctors.
Which coefficient in compass adjustment represents the vertical magnetic component?
Parameter P
Parameter Q
Parameter R
Parameter S
Which regulation specifies the installation requirements for magnetic compasses?
SOLAS Chapter V Regulation 19
IMO Resolution MSC.86(70)
IMO Resolution A.382(X)
STCW Table A-II/2
What does the process of "Compass Compensation" involve?
Correcting deviations caused by degaussing currents
Adjusting the fore-and-aft B magnets
Eliminating residual deviation
Swinging the ship for deviation analysis
What is the key limitation of a magnetic compass at the poles?
Excessive residual deviation
Insufficient true north alignment
Sensitivity to magnetic interference
Sluggish and unreliable performance
How are residual deviations after compass adjustment documented?
On an isogonic chart
In a deviation curve
In the ship's logbook
In a deviation record
What is the purpose of a pelorus or compass bearing device on a vessel?
Correct for variation and deviation
Take bearings over an arc of 360°
Eliminate compass errors
Adjust the gyrocompass heading
What is the angular difference between True North and Magnetic North called?
Declination
Variation
Deviation
Bearing
Which chart shows lines of equal magnetic variation?
Isometric Chart
Isobaric Chart
Isogonic Chart
Isohyet Chart
What is the term for the process of determining compass error by steadying a vessel on various headings?
Swinging Ship
Deviation Adjustment
Magnetic Calibration
Compass Adjustment
How many degrees does one compass point represent in a marine compass?
10.5°
11.25°
12.5°
15°
What causes deviation in a ship's magnetic compass?
Earth's magnetic field
Shipboard magnetic influences
Solar radiation
Atmospheric pressure changes
What is the primary purpose of compass correctors?
Eliminate compass errors completely
Reduce compass deviations to a minimum
Determine true headings
Improve compass accuracy near the poles
What type of magnet corrects for both permanent and induced magnetic effects in a magnetic compass?
Flinders bar
Athwartship C magnet
Heeling magnet
Fore-and-aft B magnet
What is the maximum permissible deviation in determining gyro error by comparing ship's heading with the quay line?
±0.1°
±0.5°
±1.0°
±2.0°
The compass rose on a navigational chart provides which key information?
Ship's heading
Deviation values
Magnetic variation
Gyro error
What does "Boxing the Compass" refer to?
Determining deviation for each heading
Adjusting the compass for variation
Naming all 32 compass points in clockwise order
Aligning compass readings with true north
Which magnetic corrector adjusts for deviations on intercardinal headings?
Flinders bar
Fore-and-aft B magnets
Athwartship C magnets
Quadrantal correctors
What is the process of neutralizing unwanted magnetic effects on a magnetic compass called?
Compass Adjustment
Compass Compensation
Degaussing
Swinging Ship
What type of chart shows the annual rate of magnetic variation change?
Magnetic Rose Chart
Isogonic Chart
Variation Chart
Isomagnetic Chart
Which international regulation mandates all ships to carry a properly adjusted standard magnetic compass?
STCW Table A-II/2
SOLAS Chapter V Regulation 19
IMO Resolution A.382(X)
MSC.86(70), Annex 2
How does deviation vary as a ship changes heading?
It remains constant across all headings.
It increases linearly.
It changes due to the ship's magnetic properties.
It is unaffected by the ship's heading.
In compass adjustment, what is the first heading used to adjust the fore-and-aft B magnets?
000°
090°
180°
270°
Which component resolves the fore-and-aft magnetic field in compass adjustment?
Parameter P
Parameter Q
Parameter R
Parameter Z
What is the term for deviation remaining after compass adjustment?
Corrected Deviation
Residual Deviation
Compass Error
Magnetic Drift
Which document must be available near the compass at all times per IMO Resolution A.382(X)?
Deviation Card
Gyro Error Table
Magnetic Variation Chart
Compass Adjustment Manual
What effect makes magnetic compasses unreliable near the poles?
High solar radiation
Weak magnetic field intensity
Excessive deviation changes
Structural ship distortions
