Which method can determine a back azimuth?

• A. Adding 90 degrees to the azimuth
• B. Turning the bezel 180 degrees from the present direction
• C. Using the compass without moving it
• D. Counting paces in the opposite direction

Answer: (B)

To determine a back azimuth, one effective method involves turning the bezel of a compass 180 degrees from the current direction. This approach works because an azimuth is a horizontal angle measured clockwise from a north base line. By finding the opposite direction, or back azimuth, you essentially find the bearing that leads back to your original location. This technique is widely taught in navigation courses and is a fundamental skill for SAR technicians, as it allows rescuers to retrace their steps if necessary.

In contrast, simply adding 90 degrees to the azimuth changes the direction to a perpendicular angle rather than finding the opposite. Using the compass without moving it would not yield relevant information regarding opposite directions, and counting paces in the opposite direction does not provide an accurate azimuth reading, as it lacks a clear method for determining directional bearings. Thus, turning the bezel 180 degrees is the most accurate and reliable technique for determining a back azimuth.