When both NAVAIDs involved are located within 30 NM of the unpublished fix, the minimum divergence angle is ____ degrees.

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Multiple Choice

When both NAVAIDs involved are located within 30 NM of the unpublished fix, the minimum divergence angle is ____ degrees.

The key idea is the angle between the two lines of position drawn from the two NAVAIDs—the divergence angle. When both NAVAIDs are within 30 NM of the unpublished fix, the lines intersect relatively close to the sources, so bearing errors can translate into larger position uncertainties if the crossing angle is too small. Requiring a minimum crossing angle of 30 degrees ensures the intersection is distinct enough to identify the fix reliably given typical VOR bearing accuracy. Smaller angles would lead to ambiguous or unreliable fixes, while larger angles are possible but exceed the minimum. Therefore, the minimum divergence angle in this scenario is 30 degrees.

The key idea is the angle between the two lines of position drawn from the two NAVAIDs—the divergence angle. When both NAVAIDs are within 30 NM of the unpublished fix, the lines intersect relatively close to the sources, so bearing errors can translate into larger position uncertainties if the crossing angle is too small. Requiring a minimum crossing angle of 30 degrees ensures the intersection is distinct enough to identify the fix reliably given typical VOR bearing accuracy. Smaller angles would lead to ambiguous or unreliable fixes, while larger angles are possible but exceed the minimum. Therefore, the minimum divergence angle in this scenario is 30 degrees.

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