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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
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.
23
3 degrees
16 degrees west