When is a NBD called a compass locator?

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Multiple Choice

When is a NBD called a compass locator?

Explanation:
A compass locator is an NDB placed at the ILS outer marker (and sometimes the middle marker) to be used together with the ILS markers during an approach. The idea is that the NDB provides a bearing the pilot can fly toward with the ADF, helping identify and locate the marker along the final approach path while the marker beacon confirms the exact marker position. So the defining idea is an NDB being used in conjunction with the ILS markers to support the approach. The other options don’t capture that relationship: DME mode is a different system, a locator being near a VOR isn’t what defines it, and simply being co-located with an outer marker is not the full concept—it's the combined use with the ILS markers that makes it a compass locator.

A compass locator is an NDB placed at the ILS outer marker (and sometimes the middle marker) to be used together with the ILS markers during an approach. The idea is that the NDB provides a bearing the pilot can fly toward with the ADF, helping identify and locate the marker along the final approach path while the marker beacon confirms the exact marker position. So the defining idea is an NDB being used in conjunction with the ILS markers to support the approach. The other options don’t capture that relationship: DME mode is a different system, a locator being near a VOR isn’t what defines it, and simply being co-located with an outer marker is not the full concept—it's the combined use with the ILS markers that makes it a compass locator.

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