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Multiple Choice

When correcting magnetic north to grid north, how do you handle an easterly declination?

The key idea is how magnetic north relates to grid north through declination. When the declination is easterly, magnetic north lies to the east of grid north. To convert a magnetic North reading to a grid North reading, you rotate toward grid north by the amount of the easterly declination. In practical terms, you add the declination to the magnetic north value. For example, if the easterly declination is 5 degrees and you have a magnetic bearing of 60 degrees, the grid bearing becomes 65 degrees. If the declination were westerly, you would subtract it instead. Operations like dividing or multiplying don’t apply to this angular adjustment, and they don’t describe how to shift from magnetic north to grid north.

The key idea is how magnetic north relates to grid north through declination. When the declination is easterly, magnetic north lies to the east of grid north. To convert a magnetic North reading to a grid North reading, you rotate toward grid north by the amount of the easterly declination. In practical terms, you add the declination to the magnetic north value. For example, if the easterly declination is 5 degrees and you have a magnetic bearing of 60 degrees, the grid bearing becomes 65 degrees. If the declination were westerly, you would subtract it instead. Operations like dividing or multiplying don’t apply to this angular adjustment, and they don’t describe how to shift from magnetic north to grid north.