If your Azimuth were less than 180 degrees, how would you find your Back Azimuth?

To find the Back Azimuth when your Azimuth is less than 180 degrees, you add 180 degrees to the original Azimuth. The Back Azimuth is essentially the direction that is directly opposite to the Azimuth you are currently facing.

For instance, if your Azimuth is 150 degrees, adding 180 degrees results in 330 degrees. This effectively gives you the direction that you would face if you were to turn 180 degrees from your original heading. This method ensures that you correctly determine the opposite direction when your original heading is in the first or second quadrant (i.e., between 0 degrees and 180 degrees).

Using different methods such as subtracting 90 or another value wouldn’t yield the correct opposite direction needed for navigation purposes in this scenario.