Terrestrial Navigation - Variation, Deviation & Compass Error THEORY

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coefficients

1. 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 _____.

magnetism within the vessel

Compass deviation is caused by _____.

combined effect of variation and deviation

Compass error is equal to the _____.

heading

Deviation changes with a change in _____.

influence of the magnetic materials of the vessel

Deviation in a compass is caused by the _____.

magnetic influence inherent to that particular vessel

Deviation is caused by _____.

magnetic meridian and the axis of the compass card

Deviation is the angle between the _____.

Compass error and variation are equal

IF a magnetic compass is not affected by any magnetic field other than the Earth's, which statement is TRUE?

decrease

If a ship is proceeding towards the magnetic equator, the uncorrected deviation due to permanent magnetism _____.

There is something wrong with the compass

If the compass heading and the magnetic heading are the same then _____.

east

If the magnetic heading is greater than the compass heading, the deviation is _____.

is the angular difference between magnetic north and compass north

Magnetic compass deviation _____.

deviation

Magnetic heading differs from compass heading by _____.

the vessel's position

Magnetic variation changes with a change in _____.

heading

The compass deviation changes as the vessel changes _____.

equal to variation

The compass error of a magnetic compass that has no deviation is _____.

compass error

The compass heading of a vessel differs from the true heading by _____.

annual rate of variation change

The compass rose on a nautical chart indicates both variation and _____.

deviation

The difference between magnetic heading and compass heading is called _____.

variation

The difference in degrees between true north and magnetic north is called _____.

deviation

The error in a magnetic compass caused by the vessel's magnetism is called _____.

deviation

The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is _____.

variation

The magnetic compass error which changes with the geographical location of your vessel is called ______.

compass error

The standard magnetic compass heading differs from the true heading by _____.

variation

To find a magnetic course from a true course you must apply _____.

variation

True heading differs from magnetic heading by _____.

magnetism from the earth's magnetic field

Variation in a compass is caused by _____.

cannot correct

Variation is a compass error that you _____.

magnetic meridian and the geographic meridian

Variation is the angular measurement between _____.

variation and deviation

When changing from a compass course to a true course you should apply _____.

geographical location

variation is not constant; it is different with every change in _____.


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