NGA 21 Locating And Marking Of Facilities Practice Test

How is the location of the metal facility determined?

Observing the strongest reading of the electromagnetic field Measuring the average Looking for the brightest color Guessing

Correct Answer:

Observing the strongest reading of the electromagnetic field

Explanation:

The key idea is using the electromagnetic field readings from a locator to pinpoint buried metal. As you move the instrument over the area, the EMF strength rises and reaches its maximum directly above the metal facility. That peak reading marks the centerline or location of the buried metal, so you mark there. Averaging readings would dull or misplace the signal, and relying on color or guessing has no diagnostic value for locating underground metal. Use the strongest reading to identify the true position, then confirm with a careful pass to verify the centerline before marking.

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