What is the back azimuth of 136 degrees?

To determine the back azimuth of a given azimuth, you need to consider how azimuths are measured on a compass. Azimuths are expressed in degrees from true north, moving clockwise. To find the back azimuth, you subtract 180 degrees from the given azimuth if the result is greater than 0. If subtracting 180 degrees gives you a value less than or equal to 0, you would add 360 degrees instead.

In this case, for an azimuth of 136 degrees, you find the back azimuth by subtracting 180 degrees:

136 degrees - 180 degrees = -44 degrees.

Since -44 degrees is less than 0, you add 360 degrees:

-44 degrees + 360 degrees = 316 degrees.

Thus, the back azimuth of 136 degrees is indeed 316 degrees, making it the correct choice. This is essential in navigation and land navigation tasks where understanding how to find opposite directions is crucial, particularly when planning routes or communicating bearings.