Terrestrial Navigation - Variation, Deviation & Compass Error THEORY
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 _____.