What is zig-zag monitoring?

• A. A zig-zag path that sweeps in a grid-like fashion.
• B. Monitoring during a closed-loop patrol.
• C. Area monitoring with random sampling.
• D. Movement along a line oriented 45 degrees from the start line.

Answer: (D)

Zig-zag monitoring is a systematic area sweep achieved by moving along diagonal paths relative to a reference line. By using a line at 45 degrees from the start line, you run a diagonal pass across the area. After reaching the end of that pass, you reverse direction along the next adjacent diagonal, producing a zig-zag trace that evenly covers the space and minimizes gaps. This diagonal orientation makes the sweep efficient and predictable, balancing thorough coverage with practical movement.

In contrast, a grid-like zig-zag would imply multiple perpendicular passes forming a grid, a closed-loop patrol follows a fixed circuit, and random sampling lacks a structured diagonal pattern. The essence of zig-zag monitoring here is the diagonal sweep oriented about 45 degrees from the start line.