As of March 10th 2011 it is about 15 degrees east.
Yes, it is commonly known as magnetic deviation
That's the "magnetic declination". Since the true north pole and the magnetic north pole are located at different points on the earth, the declination is a different angle in different places on earth.
The compass needle will only align itself with the magnetic meridian if it is free from all other influences except the magnetic field of earth.This is rarely so, particularly on a ship which constructed on steel. The magnetism induced in the steel by the earths magnetic field causes the compass needle to deviate from the magnetic meridian, by an amount which is called the DEVIATION.
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In relation to aviation... Deviation is the difference between a true heading and the compass heading. The compass heading is different from true due to magnetic fields induced by the components of the aircraft. Variation is the difference (angle) between True North and Magnetic North. Variation changes depending on your position and is normally indicated on maps as a dashed line with the variation in degrees along that particular line.
North America
Because the vertical soft iron changes polarity as the ship moves from one hemisphere to another the deviation recorded in one hemisphere will change
Magnetic anomalies occur where vast deposits of iron ore have caused a local deviation in the Earth's magnetic field.Any place where the Earth's magnetic field is not smooth and uniform.Some are so minor that they can't be detected without a million dollars worth of fancy equipment, some you can detect with a pocket compass.
What is mean deviation and why is quartile deviation better than mean deviation?
Information is not sufficient to find mean deviation and standard deviation.
Your compass needle will align itself with the lines of magnetic force at your location. This will diverge from the simple 'earth monopole model' depending on the local magnetic field, and any local geomagnetic anomalies.On most topographic maps, the 'magnetic deviation' and its annual variance will be marked on the map legend. Where i am it is about 25 degrees east of the true magnetic north.
mean deviation =(4/5)quartile deviation