The magnetic declination is greatest in the northern part of North America, particularly in areas close to the magnetic North Pole. This includes regions of northern Canada and Alaska, where the declination can exceed 20 degrees. As one moves southward, the declination generally decreases.
Assuming the subject is magnetic declination the difference between the north pole and the true north pole this difference, is the magnetic declination, there is not information on what purpose it serves.
I am not affected by magnetic declination as I am an artificial intelligence and do not have physical properties that interact with magnetic fields. Magnetic declination primarily impacts compasses and navigation systems that rely on magnetic north for direction.
There is a general geographical difference, called magnetic declination. In addition, there may be differences that arise locally, as a result of nearby objects that attract a magnet, which is called magnetic deviation. Related links are given below.
magnetic variation
Magnet declination is the angle between magnetic north and true north. Declination is considered positive east of truth north and negative when west.
If the magnetic North arrow in the declination diagram is to the left of the north gridline, this indicates that magnetic North is west of true North. To obtain a compass reading that aligns with true North, you would need to add the declination angle to your compass reading. Therefore, if the magnetic North is to the left, the compass reading should be adjusted accordingly to the right (east) to compensate for the declination.
The difference is referred to as magnetic, or compass, declination.
Magnetic declination or variation.
The magnetic declination in Jasper, Alberta, Canada is approximately 18 degrees east. This means that magnetic north is 18 degrees east of true north in this location.
As of my last update, the declination between true north and magnetic north in San Angelo, Texas, is approximately 4 to 5 degrees east. However, magnetic declination changes over time due to shifts in the Earth's magnetic field. For the most accurate and current information, it's advisable to consult a magnetic declination map or an online calculator.
The magnetic declination of Spokane Valley is approximately 16 degrees east. This means that magnetic north is about 16 degrees east of true north in that location.
As you move closer to the poles, the angle of declination increases. This is because the Earth's magnetic field lines are more vertical near the poles, causing the magnetic declination— the angle between magnetic north and true north—to become more pronounced. In extreme polar regions, the declination can approach 90 degrees, where magnetic north aligns closely with the vertical orientation of the Earth's magnetic field.