It depends on where in the Rockies you are. New Mexico? Colorado? Wyoming? Montana and Idaho? There will also be the standard deviations from the norm based on altitude, solar activity, weather, local anomalies, etc. The deviation will range from about 9o in northern New Mexico (which is the southern end of the range) to about 15o in northern Montana and the Idaho panhandle. Use the link to the NOAA web page where you can get a magnetic declination for any geographic location within the U.S. along with some correction factors. It is even searchable by zip code to make it really easy to approximate things quickly.
it depends where you are on the rockys
magnetic variation
The difference is referred to as magnetic, or compass, declination.
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The declination diagram
The declination diagram
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 variation
Magnet declination is the angle between magnetic north and true north. Declination is considered positive east of truth north and negative when west.
Magnetic declination or variation.
The difference is referred to as magnetic, or compass, declination.
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.
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.
ten degrees ten degrees degree of declination (19 letters to fit in your crossword puzzle) magnetic declination
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It is measured exactly the same in the Southern hemisphere (no difference between the two hemispheres). It is the difference between magnetic north and true north and it varies all over the globe. Magnetic declination (also called magnetic variation) is positive when magnetic north is east of true north (clockwise) and it is negative when magnetic north is west of true north (anti-clockwise).
The declination diagram
The declination diagram