MCIC Land Navigation Practice Test

If the declination is 10° West, what is the magnetic bearing for a grid bearing of 030°?

040° 020° 030° 050°

Correct Answer:

040°

Explanation:

The concept being tested is converting a grid bearing to a magnetic bearing using magnetic declination. When the declination is West, magnetic north lies to the left of grid north. To keep pointing at the same line with a magnetic compass, you must increase the grid bearing by the declination’s magnitude. Here, a grid bearing of 030° with a 10° West declination becomes a magnetic bearing of 030° + 10° = 040°. So you’d read 040° on the magnetic compass to follow the same direction.

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