Posted: September 23rd, 2022

Should you dial the compass needle to the left or to the right to align with the true north?

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Using the Magnetic Declination Calculator (Links to an external site.),
https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml
calculate the magnetic declinations for the following North American cities for the date you complete the assignment. Tell which direction the compass needle should be dialed to align with the true north. Vancouver, BC magnetic declination is already done for you.
Date this assignment was completed: __________________________________ (dd/mm/yyyy)
Magnetic Declination for Selected U. S Cities
Location
Geographic Coordinates
Magnetic Declination (°) in nearest whole number.
Will the Compass Needle show eastern or western declination from the True North?
Should you dial the compass needle to the left or to the right to align with the true north?
Vancouver, B.C
49.2827° N, 123.1207° W
15°53.05’E
Eastern
Dial to the left
New York City, NY
40.7128° N,
74.0060° W
San Diego, CA
32.7157° N,
117.1611° W
Houston, TX
29.7604° N,
95.3698° W
St. Louis, MO
38.6270° N,
90.1994° W
Chicago. IL
41.8781° N, 87.6298° W
Seattle, WA
47.6062° N, 122.3321° W
Atlanta, GA
33.7490° N, 84.3880°W
Montreal, Quebec
45.5017° N, 73.5673° W
Review the agonic line map (the line joining the points of zero magnetic variation) and the isogonic lines map (an imaginary line on a map joining points on the earth’s surface at which the magnetic declination is the same) below.
2. What is the difference between Agonic line and Isogonic line?
3. Why does magnetic declination increase as we go to the east coast or east coast of North America from the Agonic line? See the chart in the Introduction.
4. Why should one know magnetic declination while traveling or hiking in the east coast or west coast U.S but not concerned much in knowing the declination when he/she travels in the mid-west U.S?

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