When defining circular LPAs, how is the diameter determined?

When defining circular LPAs, how is the diameter determined?

• A. Rounded up to the nearest 16,000 yards
• B. Rounded down to the nearest 8,000 yards
• C. Fixed at 1 NM
• D. Doubled from the radius

Answer: (A)

The size of a circular LPA is set by taking the calculated diameter and rounding it up to the next 16,000-yard increment. After you determine the needed radius to cover the area, you get the diameter (2 × radius) and then round that value upward to the nearest 16,000 yards. This up-rounding creates a conservative boundary, ensuring the circle fully encompasses the intended coverage. It's not a fixed value like 1 NM, and it's not simply doubling the radius without applying the specific rounding rule. Rounding up prevents under-coverage, which is why this method is used.

The size of a circular LPA is set by taking the calculated diameter and rounding it up to the next 16,000-yard increment. After you determine the needed radius to cover the area, you get the diameter (2 × radius) and then round that value upward to the nearest 16,000 yards. This up-rounding creates a conservative boundary, ensuring the circle fully encompasses the intended coverage. It's not a fixed value like 1 NM, and it's not simply doubling the radius without applying the specific rounding rule. Rounding up prevents under-coverage, which is why this method is used.