In classical triangulation, the procedure for first-order accuracy positioning requires how many directions?

• A. 8
• B. 16
• C. 12
• D. 4

Answer: (B)

Distributing sight directions evenly around the point is essential for getting a stable, first-order accurate position in classical triangulation. Each angular measurement has a small error, and those errors propagate into the computed coordinates. When you observe in a fairly large, symmetric set of directions, you create a well-conditioned set of observation equations that samples space in all directions. This redundancy helps average out biases and minimizes how angular errors translate into position errors, giving you a robust 3D location to first order. With fewer directions, the geometry can become imbalanced or poorly conditioned, making the resulting position more sensitive to measurement errors. Sixteen directions provide that level of coverage and redundancy, which is why this number is used.