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WorksheetsShip's Deviation and Compass Knowledge
Total questions: 30
Worksheet time: 23mins
What causes deviation in a ship's magnetic compass?
Earth's magnetic variation
Local magnetic influences on the vessel
Misalignment with the equator
Solar flares
Deviation is different from variation because:
Deviation changes with the ship's heading, whereas variation depends on geographic location
Deviation is constant, while variation changes with heading
Both deviation and variation are constant
Deviation is unrelated to the Earth's magnetic field
A deviation table is:
A record of the ship's journey
A list of deviations for specific headings
A map showing Earth's magnetic field
A compass maintenance guide
The angular difference between True North and Magnetic North is:
Deviation
Variation
Compass error
Heading error
The sum of variation and deviation results in:
Compass error
True heading
Magnetic heading
Gyro error
When calculating compass errors: 'Compass Least, Error East' means the error is:
What is the purpose of a deviation curve?
To reduce compass errors
To record the ship's movement
To visually represent deviation values
To calibrate gyrocompasses
True Virgins Make Dull Company at Weddings refers to:
Compass calibration steps
Steps to convert from True to Compass readings
Navigational course plotting rules
None of the above
Gyrocompass errors occur due to:
Permanent magnetism
Deviation only
Mechanical faults or misalignment
External magnetic fields
Gyrocompasses are unaffected by:
Earth's magnetic field
True North
Electric malfunctions
Ship vibrations
Removing bubbles from a magnetic compass is part of:
Calibration
Routine maintenance
Compass adjustment
Deviation compensation
Kelvin's balls are used for:
Calibrating gyrocompasses
Reducing permanent magnetism deviation
Correcting for Earth's magnetic variation
Measuring angular deviation
Given C = 052°C, Var = 4°W, Dev = 1°E, the True Bearing is:
True Bearing = 180°T, Var = 5°E, Dev = 3°W. Magnetic and Compass Courses?
Compass comparisons should be conducted every:
1 hour
15 minutes
30 minutes
2 hours
Which statement is true about compass errors?
Errors are irreversible
Errors only occur at high latitudes
Errors must always be logged and corrected
Errors are the same for all ships
Permanent magnetism deviation is influenced by:
Temporary repairs
The ship's alignment during construction
Wind patterns
Gyro adjustments
The deviation card records:
Compass adjustments only
Compass heading errors for specific headings
Magnetic field intensity
Navigation speeds
What is the primary cause of deviation due to permanent magnetism?
Earth's core movement
Ferromagnetic materials in the ship's structure
Ocean currents
Solar radiation
Deviation caused by permanent magnetism is generally:
Inconsistent and unpredictable
Constant for a specific heading
Affected by weather conditions
Nonexistent on steel ships
Which deviation recording method does NOT require interpolation?
Deviation curve
Deviation table
Critical value table
Deviation rose
Napier's Diagram is primarily used when:
Deviation is minimal
Deviation exceeds 10°
Navigating near the equator
Aligning the gyrocompass
The mnemonic 'Compass Least, Error East' is used to:
Identify the direction of the compass error
Adjust for variation
Predict magnetic storm interference
Record deviation values
True Variation Magnetic Compass add West applies when:
Converting Magnetic to True bearings
Converting Compass to Magnetic bearings
Determining Compass Course to steer
Uncorrecting True bearings to Compass bearings
Induced magnetism differs from permanent magnetism in that:
Induced magnetism is temporary and depends on the Earth's magnetic field
Induced magnetism only occurs during storms
Induced magnetism is constant and unchanging
Induced magnetism does not impact navigation
Combined effects of induced and permanent magnetism require:
Calibration of the deviation curve only
Adjustment using compensators and deviation tables
Replacement of the magnetic compass
Avoidance of metal near the compass
Given C = 052°C, Var = 4°W, Dev = 1°E, the True Bearing is:
049°T
048°T
057°T
055°T
True Bearing = 180°T, Var = 5°E, Dev = 3°W. Magnetic and Compass Courses?
Answer: Magnetic = 173°, Compass = 176°
Answer: Magnetic = 175°, Compass = 178°
Answer: Magnetic = 171°, Compass = 175°
Answer: Magnetic = 178°, Compass = 175°
Calculate the compass error: Variation = 8°W, Deviation = 3°E.
Answer: 5°W
Answer: 2°W
Answer: 4°W
Answer: 1°W
If the Compass Course = 123°, Deviation = 2°W, Variation = 4°W, the True Course is:
Answer: 129°
Answer: 125°
Answer: 119°
Answer: 117°
