GEOLOGY

Detailed explanation-1: -This angle is properly called grid declination. The angle between grid north and true north is called the convergence angle.

Detailed explanation-2: -The Earth’s magnetic and geographic poles are in different places, and magnetic declination is the angular difference between the direction a compass needle points and the direction to the geographic North Pole. For most of the populated world, this angle is between zero and 30 degrees.

Detailed explanation-3: -Depending on where you are, the angle between true north and magnetic north is different. In the U.S., the angle of declination varies from about 20 degrees west in Maine to about 21 degrees east in Washington. (See Figure 6.7).

Detailed explanation-4: -From the poles, declination is uniform around the entire horizon, approximately 0°.

Detailed explanation-5: -Magnetic declination is defined as the angle between magnetic north and true north on the horizontal plane.