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

To find your Back Azimuth when your Azimuth is less than 180 degrees, you add 180 degrees to it. The Back Azimuth is essentially the opposite direction on a compass, and this is calculated by shifting the original azimuth halfway around the circle, which is equivalent to adding 180 degrees.

For example, if your initial azimuth is 90 degrees, adding 180 degrees would yield a Back Azimuth of 270 degrees, pointing in the exact opposite direction. This method is specifically applicable when the initial azimuth is less than 180 degrees, ensuring you correctly determine the orientation relative to your original direction of travel.

In contrast, subtracting a fixed angle or altering the azimuth through multiplication or division does not yield a valid method for calculating the Back Azimuth. The addition of 180 degrees maintains the integrity of compass navigation, providing a straightforward and accurate means of reversing your heading.