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magnetic variation
The difference is referred to as magnetic, or compass, declination.
Magnetic declination
the magnetic declination
The angle between the geographic and magnetic poles extends more towards the east, as you move to the north. The magnetic pole is actually near Greenland.
No
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.
Magnetic Declination
+15° 45'
12E
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.
magnetic variation
18.3 EAST
23
3.6 W
3 degrees
16 degrees west