To calculate the Grid Azimuth:
\[ GA = MA \pm V \]
Where:
Magnetic Azimuth to Grid Azimuth is a conversion process used in navigation and mapping to align the magnetic north, which is the direction a compass points, with the grid north, which is the vertical lines on a map. This is necessary because the Earth’s magnetic north and the grid north on maps do not always align perfectly due to the Earth’s magnetic field variations. The difference between the two is known as magnetic declination or variation, and it is used to convert magnetic azimuths to grid azimuths and vice versa.
Let's assume the following values:
Step 1: Add the magnetic variation to the magnetic azimuth:
\[ GA = 120 + (-5) = 115 \text{ degrees} \]
