1. Using the Magnetic declinationcalculator (Links to an external site.)calculate thedeviations between geographic north and magnetic north for thefollowing North American cities. Tell which direction the compassneedle should be dialed to align with the truenorth. Vancouver, BC magnetic declination is done foryou.

Location

Geographic Coordinates

Magnetic Declination (°) in nearest wholenumber.

Will the Compass Needle show eastern or westerndeclination from the True North?

should you dial the compass needle to the left or to theright 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

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 zeromagnetic variation) and the isogonic lines map (an imaginaryline on a map joining points on the earth's surface at which themagnetic declination is the same) below.

2. What is the Agonic Line? Why does magnetic declination increaseas we go to the east coast or east coast of North America from theAgonic line?

3. What would be the reason why you would like to find magneticdeclination while traveling or hiking in Seattle, WA area but notinterested in knowing when you travel in Houston, TX area?