When determining a back azimuth for an azimuth of 150 degrees, what should you do?

To determine a back azimuth from a given azimuth, you typically follow a straightforward process. In this case, with an azimuth of 150 degrees, you need to add 180 degrees to obtain the back azimuth. This method applies when the initial azimuth is less than 180 degrees.

The reasoning behind adding 180 degrees is that the back azimuth represents the direction opposite to the original azimuth. Since azimuths are measured in degrees from 0 to 360, adding 180 degrees effectively flips the direction from the given azimuth.

However, it's essential to remember that if the resulting angle exceeds 360 degrees, you must subtract 360 degrees to ensure the back azimuth remains within the standard range of 0 to 360 degrees. In this situation, adding 180 degrees to 150 degrees yields 330 degrees, which is a valid azimuth.

Alternative methods involve subtracting degrees, but these would apply only in specific contexts where the azimuth exceeds 180 degrees.